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Dr. Heriberto Pérez-Acebo
University of the Basque Country UPV /EHU

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0 Models
0 Road Safety
0 Tunneling
0 Pavement deterioration
0 pavement performance

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Models
Road Safety
pavement performance
traffic calming measures
Pavement deterioration
skid resistance
pavement roughness

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Article
Published: 17 August 2021 in Applied Spatial Analysis and Policy
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Among safety countermeasures for roads, service and rest areas play a vital role, providing a place to stop or rest during a journey and offering services such as petrol stations. Due to their importance, they must be logically distributed along routes at convenient locations with respect to travel itineraries and must be conveniently equipped. These needs become even more apparent on motorways that charge a toll to use the road, because drivers tend avoid leaving the motorway until they have reached their planned destination or departure point. The objective of this paper is to explore the spatial distribution of the service and rest areas on the toll motorways (or freeways) in the European Union (EU) and their facilities. Additionally, the distance and facility specifications established by the regulations of each country were compared. The EU was selected for this evaluation because of the virtual inexistency of borders and the substantial international traffic volumes that result from this relatively free flow of traffic between countries. Countries with a toll road network over 100 km were included: Italy, Portugal, France, Spain, Poland, Greece, and the Slovak Republic. Analysis of average and maximum distances between areas and the facilities provided showed a great variability due to different distribution policies. Few regulations exist that establish maximum distances between areas. Standardization of the spatial distribution of these facilities, on both free and tolled roadways, in the EU would benefit drivers, especially on long journeys, creating a consistent and predictable network of areas and services.

ACS Style

Heriberto Pérez-Acebo; Ander Romo-Martín; Daniel J. Findley. Spatial distribution and the facility evaluation of the service and rest areas in the toll motorway network of the European Union. Applied Spatial Analysis and Policy 2021, 1 -25.

AMA Style

Heriberto Pérez-Acebo, Ander Romo-Martín, Daniel J. Findley. Spatial distribution and the facility evaluation of the service and rest areas in the toll motorway network of the European Union. Applied Spatial Analysis and Policy. 2021; ():1-25.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Ander Romo-Martín; Daniel J. Findley. 2021. "Spatial distribution and the facility evaluation of the service and rest areas in the toll motorway network of the European Union." Applied Spatial Analysis and Policy , no. : 1-25.

Journal article
Published: 11 August 2021 in Sustainability
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In the current climate emergency context, many national and international organizations have adopted measures to integrate sustainability and Sustainable Development Goals (SDGs) in all their fields of action. Within education, steps have been taken to incorporate the perspective of sustainability at all levels. This process has also started at the university since it plays a fundamental role in the strategy for the implementation of specific policies to promote sustainability. However, sometimes it is difficult to include this type of knowledge in the curriculum, due to the lack of flexibility of the university structure or the lack of time to cover the syllabus. In this scenario, civil engineering plays a main role as a fundamental activity in the creation of services and infrastructures with a high environmental impact. The objective of this study is to show a multidisciplinary approach to working on sustainability in a transversal way in the civil engineering degree and to analyze the impact that this type of initiative can have from the learning point of view. The study shows a curricular trajectory supported by problem-based learning and project-based learning designed to promote sustainability in the practice of civil engineering. The good results obtained in the evaluation of the project and the growing incorporation of the SDGs in the final degree projects suggest that this methodology can be implemented by other university degrees.

ACS Style

Irantzu Álvarez; Paulo Etxeberria; Elisabete Alberdi; Heriberto Pérez-Acebo; Isabel Eguia; María José García. Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula. Sustainability 2021, 13, 8967 .

AMA Style

Irantzu Álvarez, Paulo Etxeberria, Elisabete Alberdi, Heriberto Pérez-Acebo, Isabel Eguia, María José García. Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula. Sustainability. 2021; 13 (16):8967.

Chicago/Turabian Style

Irantzu Álvarez; Paulo Etxeberria; Elisabete Alberdi; Heriberto Pérez-Acebo; Isabel Eguia; María José García. 2021. "Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula." Sustainability 13, no. 16: 8967.

Journal article
Published: 05 March 2021 in Sustainability
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Due to the importance of road transport an adequate identification of the various road network levels is necessary for an efficient and sustainable management of the road infrastructure. Additionally, traffic values are key data for any pavement management system. In this work traffic volume data of 2019 in the Basque Autonomous Community (Spain) were analyzed and modeled. Having a multidimensional sample, the average annual daily traffic (AADT) was considered as the main variable of interest, which is used in many areas of the road network management. First, an exploratory analysis was performed, from which descriptive statistical information was obtained continuing with the clustering by various variables in order to standardize its behavior by translation. In a second stage, the variable of interest was estimated in the entire road network of the studied country using linear-based radial basis functions (RBFs). The estimated model was compared with the sample statistically, evaluating the estimation using cross-validation and highest-traffic sectors are defined. From the analysis, it was observed that the clustering analysis is useful for identifying the real importance of each road segment, as a function of the real traffic volume and not based on other criteria. It was also observed that interpolation methods based on linear-type radial basis functions (RBF) can be used as a preliminary method to estimate the AADT.

ACS Style

Heber Hernández; Elisabete Alberdi; Heriberto Pérez-Acebo; Irantzu Álvarez; María García; Isabel Eguia; Kevin Fernández. Managing Traffic Data through Clustering and Radial Basis Functions. Sustainability 2021, 13, 2846 .

AMA Style

Heber Hernández, Elisabete Alberdi, Heriberto Pérez-Acebo, Irantzu Álvarez, María García, Isabel Eguia, Kevin Fernández. Managing Traffic Data through Clustering and Radial Basis Functions. Sustainability. 2021; 13 (5):2846.

Chicago/Turabian Style

Heber Hernández; Elisabete Alberdi; Heriberto Pérez-Acebo; Irantzu Álvarez; María García; Isabel Eguia; Kevin Fernández. 2021. "Managing Traffic Data through Clustering and Radial Basis Functions." Sustainability 13, no. 5: 2846.

Journal article
Published: 01 January 2021 in Ingeniería e Investigación
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Due to the presence of various traffic calming measures (TCM) and traffic lights in urban areas, the speed of vehicles is maintained low. Nevertheless, a problem arises in the frontier between urban and non-urban areas because drivers must adapt their speed and behavior to new conditions. This risk becomes even greater in rural roads that penetrate small villages without a bypass and with a short urban segment, since drivers do not normally speed down in these segments. Various measures can be installed, but traffic lights that turn red if the speed limit is exceeded is not usually considered as a TCM in the literature. Therefore, this paper aims to analyze the efficiency of traffic lights turning red in case of exceeding speed limit. The village of Ábalos in Spain was selected for this research, with an urban area of 630 m and this type of traffic lights in both directions. Results showed that drivers do not respect the speed limit - and hence, the red light - when they are placed separately. However, if they are placed next to a crosswalk, their effect is increased. Consequently, it is recommended to place these traffic lights with a crosswalk to reinforce the efficiency of both TCMs.

ACS Style

Heriberto Pérez-Acebo; Xabier Otxoa-Muñoz; Mikel Marquina-Llaguno; Hernán Gonzalo-Orden. Analysis of the efficiency of traffic lights turning red in case of exceeding speed limit. Ingeniería e Investigación 2021, 41, e86047 -e86047.

AMA Style

Heriberto Pérez-Acebo, Xabier Otxoa-Muñoz, Mikel Marquina-Llaguno, Hernán Gonzalo-Orden. Analysis of the efficiency of traffic lights turning red in case of exceeding speed limit. Ingeniería e Investigación. 2021; 41 (1):e86047-e86047.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Xabier Otxoa-Muñoz; Mikel Marquina-Llaguno; Hernán Gonzalo-Orden. 2021. "Analysis of the efficiency of traffic lights turning red in case of exceeding speed limit." Ingeniería e Investigación 41, no. 1: e86047-e86047.

Journal article
Published: 05 December 2020 in Construction and Building Materials
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Pavement deterioration models are a vital feature in any pavement management system since they are capable of predicting the evolution of pavement characteristics. Pavement roughness is measured by most of the highway administrations due to its relation to comfort and safety, generally by means of the International Roughness Index (IRI). The Regional Government of Biscay (Spain) has collected IRI values since 2000 on its road network. Although many models have been developed for flexible pavements, very few have been proposed for semi-rigid pavements. The paper aims to develop IRI prediction models for semi-rigid pavements in single-carriageway roads. Considering the high quantity of available information in the database, deterministic models were selected. Due to the importance of the pavement structure in IRI evolution observed in flexible models, only segments with completely known pavement details were employed, i.e., a section where the complete structure is known: materials and thickness of existing layers above the subgrade. The pavement age, as precise as practical, and the accumulated total traffic and heavy traffic through the section were identified as roughness accelerating factors. Conversely, the materials used in base and subbase layers, their thickness, and the total thickness of bituminous layers were observed as degradation reducing factors. Possible treated base and subbase materials included in the model were soil–cement, gravel-cement, and gravel and slag. The obtained model achieved a determination coefficient (R2) of 0.569. Additionally, the bituminous material of the surface layer was verified as an affecting factor too, which can be introduced to improve the model’s accuracy. Possible surface layer materials included dense (D) and semi-dense (S) asphalt concrete, with a maximum aggregate diameter of 16 and 22 mm, discontinuous mixing (BBTM 11A) and porous asphalt (PA 11). The additional model achieved a higher determination coefficient (0.645) and, hence, a more accurate IRI prediction resulted.

ACS Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Daniel J. Findley; Eduardo Rojí. Modeling the international roughness index performance on semi-rigid pavements in single carriageway roads. Construction and Building Materials 2020, 272, 121665 .

AMA Style

Heriberto Pérez-Acebo, Hernán Gonzalo-Orden, Daniel J. Findley, Eduardo Rojí. Modeling the international roughness index performance on semi-rigid pavements in single carriageway roads. Construction and Building Materials. 2020; 272 ():121665.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Daniel J. Findley; Eduardo Rojí. 2020. "Modeling the international roughness index performance on semi-rigid pavements in single carriageway roads." Construction and Building Materials 272, no. : 121665.

Journal article
Published: 11 November 2020 in Polymers
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Due to the considerable amount of waste plastics and polymers that are produced annually, the introduction of these waste products in construction materials is becoming a recurrent solution to recycle them. Among polymers, polyamide represents an important proportion of polymer waste. In this study, sustainable and lightweight mortars were designed and elaborated, substituting the aggregates by polyamide powder waste. Mortars were produced with various dosages of cement/aggregates, and the polyamide substitutions were 25, 50, 75, and 100% of the aggregates. The aim of this paper is to determine the density and the compressive strength of the manufactured mortars to observe the feasibility for being employed as masonry or rendering and plastering mortars. Results showed that with increasing polymer substitution, lower densities were achieved, ranging from 1850 to 790 kg/m3 in modified mortars. Mortars with densities below 1300 kg/m3 are cataloged as lightweight mortars. Furthermore, compressive strength also decreased with more polyamide substitution. Obtained values in recycled mortars were between 15.77 and 2.10 MPa, but the majority of the values (eight out of 12) were over 5 MPa. Additionally, an economic evaluation was performed, and it was observed that the use of waste polyamide implies an important cost reduction, apart from the advantage of not having to manage this waste material. Consequently, not only the mechanical properties of the new recycled materials were verified as well as its economic viability.

ACS Style

Miguel A. Salas; Heriberto Pérez-Acebo; Verónica Calderón; Hernán Gonzalo-Orden. Analysis and Economic Evaluation of the Use of Recycled Polyamide Powder in Masonry Mortars. Polymers 2020, 12, 2657 .

AMA Style

Miguel A. Salas, Heriberto Pérez-Acebo, Verónica Calderón, Hernán Gonzalo-Orden. Analysis and Economic Evaluation of the Use of Recycled Polyamide Powder in Masonry Mortars. Polymers. 2020; 12 (11):2657.

Chicago/Turabian Style

Miguel A. Salas; Heriberto Pérez-Acebo; Verónica Calderón; Hernán Gonzalo-Orden. 2020. "Analysis and Economic Evaluation of the Use of Recycled Polyamide Powder in Masonry Mortars." Polymers 12, no. 11: 2657.

Journal article
Published: 20 July 2020 in Construction and Building Materials
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This article predicts the available minimum skid resistance in the road network of Biscay (Spain) with data collected in the summer season when friction values are at a minimum. Firstly, it was observed that pavement structure does not influence skid resistance. Therefore, roadway segments with available data about the surface layer of single or double carriageway roads were analyzed. Two models were developed: 1) short model with only the surface material, average annual daily traffic, and number of lanes (no pavement history required) and 2) a long model which adds the required Polished Stone Value to improve the prediction. These models can help road agencies to identify the roads where lower skid resistance values are more probable to be obtained to focus their attention and efforts.

ACS Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Daniel J. Findley; Eduardo Rojí. A skid resistance prediction model for an entire road network. Construction and Building Materials 2020, 262, 120041 .

AMA Style

Heriberto Pérez-Acebo, Hernán Gonzalo-Orden, Daniel J. Findley, Eduardo Rojí. A skid resistance prediction model for an entire road network. Construction and Building Materials. 2020; 262 ():120041.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Daniel J. Findley; Eduardo Rojí. 2020. "A skid resistance prediction model for an entire road network." Construction and Building Materials 262, no. : 120041.

Journal article
Published: 13 May 2020 in Applied Sciences
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Traffic calming measures (TCM) are placed in urban areas to improve road safety, and among them, vertical TCMs are widely employed. Many researches are focused on the influence of the geometry of each measure on speed reduction, but it is demonstrated that drivers forget its effect and speed up after it. Therefore, placing consecutive TCMs can help to maintain a safe area. However, scarce literature can be found about the adequate spacing between them. Hence, the aim of this paper is to analyze the adequate distance between TCMs. Various streets with variable distances and different vertical TCMs were evaluated in Poland and Spain, including raised crosswalks, raised intersections, speed humps and speed cushions. The intermediate point between two TCMs was selected as the place where the maximum speed is achieved. Results showed that there was a good correlation between the speeds at intermediate points and the distance between TCMs, with a determination coefficient around 0.80. For an 85th percentile of the speed under 50 km/h, a maximum distance of 200 m between TCMs is recommended, and for a value of 40 km/h, 75 m.

ACS Style

Heriberto Pérez-Acebo; Robert Ziółkowski; Alaitz Linares-Unamunzaga; Hernán Gonzalo-Orden. A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing. Applied Sciences 2020, 10, 3368 .

AMA Style

Heriberto Pérez-Acebo, Robert Ziółkowski, Alaitz Linares-Unamunzaga, Hernán Gonzalo-Orden. A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing. Applied Sciences. 2020; 10 (10):3368.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Robert Ziółkowski; Alaitz Linares-Unamunzaga; Hernán Gonzalo-Orden. 2020. "A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing." Applied Sciences 10, no. 10: 3368.

Journal article
Published: 01 May 2020 in Journal of Cultural Heritage
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ACS Style

Jesús María Romera; Heriberto Pérez-Acebo. A new method for locating Roman transport infrastructure. Journal of Cultural Heritage 2020, 43, 175 -185.

AMA Style

Jesús María Romera, Heriberto Pérez-Acebo. A new method for locating Roman transport infrastructure. Journal of Cultural Heritage. 2020; 43 ():175-185.

Chicago/Turabian Style

Jesús María Romera; Heriberto Pérez-Acebo. 2020. "A new method for locating Roman transport infrastructure." Journal of Cultural Heritage 43, no. : 175-185.

Journal article
Published: 22 January 2020 in Coatings
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Pavement performance models play a vital role in any pavement management system. The Regional Government of Biscay (RGB) (Spain) manages a 1200 km road network and conducts pavement data collections, including the International Roughness Index (IRI) values. The aim of the paper is to develop an IRI performance model for two-lane roads with flexible pavement until the first maintenance and/or rehabilitation activity is performed. Due to the huge amount of available information, a deterministic model was selected. A literature review of deterministic models showed that, apart from age and traffic volumes, the pavement structure is a key factor. Therefore, it was decided to analyze the only road stretches whose entire pavement section was known (surface layer + base + subbase). Various variables related to age, traffic volumes and employed materials were introduced as possible factors. The multiple linear regression model with the highest coefficient of determination and all the variables significant included the real pavement age, the cumulated heavy traffic and the total thickness of bituminous layers. As the material employed in the surface layer could affect roughness progression, a qualitative variable was introduced to consider various surface materials. The model improved its accuracy, indicating that the surface layer material is also an influencing factor on IRI evolution.

ACS Style

Heriberto Pérez-Acebo; Alaitz Linares-Unamunzaga; Eduardo Rojí; Hernán Gonzalo-Orden. IRI Performance Models for Flexible Pavements in Two-Lane Roads until First Maintenance and/or Rehabilitation Work. Coatings 2020, 10, 97 .

AMA Style

Heriberto Pérez-Acebo, Alaitz Linares-Unamunzaga, Eduardo Rojí, Hernán Gonzalo-Orden. IRI Performance Models for Flexible Pavements in Two-Lane Roads until First Maintenance and/or Rehabilitation Work. Coatings. 2020; 10 (2):97.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Alaitz Linares-Unamunzaga; Eduardo Rojí; Hernán Gonzalo-Orden. 2020. "IRI Performance Models for Flexible Pavements in Two-Lane Roads until First Maintenance and/or Rehabilitation Work." Coatings 10, no. 2: 97.

Journal article
Published: 01 October 2019 in Proceedings of the Institution of Civil Engineers - Transport
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Skid resistance is a vital issue in pavement management, mainly regarding to road safety and, hence, road agencies must assure a minimum friction level at their road network. The Regional Government of Biscay (Spain) uses the Sideway force Coefficient Routine Investigation Machine (SCRIM) to know present pavement surface condition and to better allocate available funding. The aim of this paper is to develop a deterioration model to predict the minimum skid resistance in the rural two-lane bituminous roads of Biscay by means of the factors that affect it. Trying to include all possible variables that could influence the friction, 23 sections of new roads of Biscay, constructed in the last 25 years were selected, with different pavement structures (flexible and semi-rigid pavements), ages, surface layers and traffic volumes; and a multiple linear regression was performed. It was concluded that only Average Annual Daily Traffic of heavy vehicles and required minimum Polished Stone Value of aggregates reflect their importance and, consequently they are the only variables introduced in the model. Age of pavement, total thickness of bituminous layers and Average Annual Daily Traffic of all vehicles showed no influence and were discarded. Proposed model can forecast future skid resistance.

ACS Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Eduardo Rojí. Skid resistance prediction for new two-lane roads. Proceedings of the Institution of Civil Engineers - Transport 2019, 172, 264 -273.

AMA Style

Heriberto Pérez-Acebo, Hernán Gonzalo-Orden, Eduardo Rojí. Skid resistance prediction for new two-lane roads. Proceedings of the Institution of Civil Engineers - Transport. 2019; 172 (5):264-273.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Hernán Gonzalo-Orden; Eduardo Rojí. 2019. "Skid resistance prediction for new two-lane roads." Proceedings of the Institution of Civil Engineers - Transport 172, no. 5: 264-273.

Journal article
Published: 29 July 2019 in Applied Sciences
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Road maintenance and rehabilitation are expected to meet modern society’s demands for sustainable development. Full-depth reclamation with cement as a binder is closely linked to the concept of sustainability. In addition to the environmental benefits of reusing the existing pavement as aggregate, this practice entails significant technical and economic advantages. In Spain, in the absence of tests specifically designed to determine the behavior of recycled pavements stabilized with cement, these materials are treated as soil-cement or cement-bound granular material. This assumption is not entirely accurate, because this recycled pavement contains some bituminous elements that reduce its stiffness. This study aimed to obtain the relationships between flexural strength (FS) and the parameters that describe the pavement behavior (long-term unconfined compressive strength (UCS) and indirect tensile strength (ITS)) and compare the findings with the relationships between these parameters in soil-cement and cement-bound granular materials. The results showed that the similar behavior hypothesis is not entirely accurate for recycled pavements stabilized with cement, because they have lower strength values—although, this is not necessarily an indication of poorer performance.

ACS Style

Hernán Gonzalo-Orden; Alaitz Linares-Unamunzaga; Heriberto Pérez-Acebo; Jesús Díaz-Minguela. Advances in the Study of the Behavior of Full-Depth Reclamation (FDR) with Cement. Applied Sciences 2019, 9, 3055 .

AMA Style

Hernán Gonzalo-Orden, Alaitz Linares-Unamunzaga, Heriberto Pérez-Acebo, Jesús Díaz-Minguela. Advances in the Study of the Behavior of Full-Depth Reclamation (FDR) with Cement. Applied Sciences. 2019; 9 (15):3055.

Chicago/Turabian Style

Hernán Gonzalo-Orden; Alaitz Linares-Unamunzaga; Heriberto Pérez-Acebo; Jesús Díaz-Minguela. 2019. "Advances in the Study of the Behavior of Full-Depth Reclamation (FDR) with Cement." Applied Sciences 9, no. 15: 3055.

Journal article
Published: 14 July 2019 in Transport Problems
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ACS Style

Heriberto Pérez-Acebo; Ander Romo-Martín. SERVICE AND REST AREAS IN TOLL MOTORWAYS IN POLAND: STUDY OF DISTRIBUTION AND FACILITIES. Transport Problems 2019, 14, 155 -164.

AMA Style

Heriberto Pérez-Acebo, Ander Romo-Martín. SERVICE AND REST AREAS IN TOLL MOTORWAYS IN POLAND: STUDY OF DISTRIBUTION AND FACILITIES. Transport Problems. 2019; 14 (2):155-164.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Ander Romo-Martín. 2019. "SERVICE AND REST AREAS IN TOLL MOTORWAYS IN POLAND: STUDY OF DISTRIBUTION AND FACILITIES." Transport Problems 14, no. 2: 155-164.

Journal article
Published: 26 January 2019 in Materials
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Soil–cement is an environmentally friendly road construction technique for base and subbase materials, which allows employing soils placed in the right-of-way of the road or in the surroundings, by improving its engineering properties. With this technique, it is possible to reduce the over-exploitation of quarries, the necessity of landfills and the pollutant gas emission due to the reduction of aggregate fabrication and transport. The manufacturing of soil–cement is generally controlled by means of the Uniaxial Compressive Strength (UCS) test at seven days, according to the regulations of each country. Nonetheless, one of the properties that best defines the performance of soil–cement is the Flexural Strength (FS) at long term, usually at 90 days. The aim of this paper is to develop new equations to correlate the UCS and the FS at long term and the UCS at seven days and at 90 days. Obtained results validate the proposed models and, hence, the flexural strength can be predicted from the Uniaxial Compressive Strength at seven days, allowing, if necessary, correcting measures (recalculation or rejection) in early stages of the curing time to be taken.

ACS Style

Alaitz Linares-Unamunzaga; Heriberto Pérez-Acebo; Marta Rojo; Hernán Gonzalo-Orden. Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days. Materials 2019, 12, 387 .

AMA Style

Alaitz Linares-Unamunzaga, Heriberto Pérez-Acebo, Marta Rojo, Hernán Gonzalo-Orden. Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days. Materials. 2019; 12 (3):387.

Chicago/Turabian Style

Alaitz Linares-Unamunzaga; Heriberto Pérez-Acebo; Marta Rojo; Hernán Gonzalo-Orden. 2019. "Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days." Materials 12, no. 3: 387.

Journal article
Published: 30 October 2018 in Transportation Research Procedia
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A service area can be defined as the area next to the road designed for providing services to road users such as, petrol stations, hotels, restaurants, etc. Rest areas are places next to the road with a parking area and facilities that are used by motorists to have rest in their travels, like toilets and picnic areas. These areas are usual in all type of roads, but are especially necessary in high capacity roads, such as motorways (paying or not) or multi-lane highways, which generally serve long distance traffic. When travelling long distances, mainly in holiday periods, service and rest areas provide the essential services like toilets, petrol stations or restaurants and assure a place for the necessary relaxing time after a two-hour period, as it is usually recommended in long travels. In paying motorways, if a vehicle exits in an intermediate point and returns to it, a higher quantity must be paid than if all the distance is completed without exiting. Consequently, due to the special configuration of paying motorways, service and rest areas located in the route are the only accessible place where motorists can rest or access to services. Therefore, facilities provided in these areas and distances between them are a vital issue for road safety. The aim of this paper is to analyze the facilities offered in service and rest areas and the distances between consecutive rest areas in Spanish paying motorways. A total network of more than 2.800 km is evaluated and observed deficiencies are indicated

ACS Style

Ander Romo-Martín; Heriberto Pérez-Acebo. Analysis of the Location of Service and Rest Areas and their facilities in Spanish paying motorways. Transportation Research Procedia 2018, 33, 4 -11.

AMA Style

Ander Romo-Martín, Heriberto Pérez-Acebo. Analysis of the Location of Service and Rest Areas and their facilities in Spanish paying motorways. Transportation Research Procedia. 2018; 33 ():4-11.

Chicago/Turabian Style

Ander Romo-Martín; Heriberto Pérez-Acebo. 2018. "Analysis of the Location of Service and Rest Areas and their facilities in Spanish paying motorways." Transportation Research Procedia 33, no. : 4-11.

Journal article
Published: 24 July 2018 in Processes
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A complete bibliometric analysis of the Scopus database was performed to identify the research trends related to lignin valorization from 2000 to 2016. The results from this analysis revealed an exponentially increasing number of publications and a high relevance of interdisciplinary collaboration. The simultaneous valorization of the three main components of lignocellulosic biomass (cellulose, hemicellulose, and lignin) has been revealed as a key aspect and optimal pretreatment is required for the subsequent lignin valorization. Research covers the determination of the lignin structure, isolation, and characterization; depolymerization by thermal and thermochemical methods; chemical, biochemical and biological conversion of depolymerized lignin; and lignin applications. Most methods for lignin depolymerization are focused on the selective cleavage of the β-O-4 linkage. Although many depolymerization methods have been developed, depolymerization with sodium hydroxide is the dominant process at industrial scale. Oxidative conversion of lignin is the most used method for the chemical lignin upgrading. Lignin uses can be classified according to its structure into lignin-derived aromatic compounds, lignin-derived carbon materials and lignin-derived polymeric materials. There are many advances in all approaches, but lignin-derived polymeric materials appear as a promising option.

ACS Style

Ricardo Abejón; Heriberto Pérez-Acebo; Leonardo Clavijo. Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period. Processes 2018, 6, 98 .

AMA Style

Ricardo Abejón, Heriberto Pérez-Acebo, Leonardo Clavijo. Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period. Processes. 2018; 6 (8):98.

Chicago/Turabian Style

Ricardo Abejón; Heriberto Pérez-Acebo; Leonardo Clavijo. 2018. "Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period." Processes 6, no. 8: 98.

Journal article
Published: 26 June 2018 in Applied Sciences
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A bibliometric analysis based on Scopus database was carried out to identify the global research trends related to pavement management area from 2000 to 2013, and to improve the understanding of the research topics in that period. The results reveal two stable periods of annual publications, from 2000 to 2002 with an average rate of 27, and from 2003 to 2010 with a value of 51; and a period with an increasing production rate of 20 publications per year after 2010. According to the document-type distribution, articles and conference papers have almost the same contribution. The most productive country was the United States, followed by Canada and China. The research trend in the field of pavement management could be grouped into three main areas. The first one is related to pavement management systems, which attracted the greatest attention, especially optimization processes with various objectives and lifecycle cost analysis. The second group is about pavement performance modeling, where calibration of mechanical empirical models was largely developed. Lastly, data collection had also occupied several papers, mainly about cracking classification. Sustainability aspects in pavement management became an emergent issue. The trending issues in that period, in these categories, were summarized in the paper.

ACS Style

Heriberto Pérez-Acebo; Alaitz Linares-Unamunzaga; Ricardo Abejón; Eduardo Rojí. Research Trends in Pavement Management during the First Years of the 21st Century: A Bibliometric Analysis during the 2000–2013 Period. Applied Sciences 2018, 8, 1041 .

AMA Style

Heriberto Pérez-Acebo, Alaitz Linares-Unamunzaga, Ricardo Abejón, Eduardo Rojí. Research Trends in Pavement Management during the First Years of the 21st Century: A Bibliometric Analysis during the 2000–2013 Period. Applied Sciences. 2018; 8 (7):1041.

Chicago/Turabian Style

Heriberto Pérez-Acebo; Alaitz Linares-Unamunzaga; Ricardo Abejón; Eduardo Rojí. 2018. "Research Trends in Pavement Management during the First Years of the 21st Century: A Bibliometric Analysis during the 2000–2013 Period." Applied Sciences 8, no. 7: 1041.

Journal article
Published: 13 June 2018 in Applied Sciences
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Understanding the long-term behaviour of cement-treated base materials is a key factor to improve its design and obtain environmentally friendly pavement base materials. Their characterization requires manufacturing prismatic specimens. However, various authors highlight the absence of standardized test methods for fabricating beams in the field and laboratory, which is not an easy task because it depends on the qualification and experience of the testing team. The aim of this paper is to present a new device and procedure for compacting prismatic specimens of cement-treated base materials. In this research, it was used for compacting soil-cement to simulate its performance as a road base material. This device employs elements that are generally available in a concrete laboratory test, such as a vibrating table or prismatic moulds. Once the procedure was established, and in order to verify its suitability, flexural and compressive strength tests were carried out. Results showed that the values obtained were consistent with this material and, despite the heterogeneity of the material, specimens from the same batch provided similar results and, hence, validated the compaction process. This new compacting procedure can improve understanding of the long-term performance of cement-treated materials from flexural and fatigue tests.

ACS Style

Alaitz Linares-Unamunzaga; Hernán Gonzalo-Orden; Jesús Díaz Minguela; Heriberto Pérez-Acebo. New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials. Applied Sciences 2018, 8, 970 .

AMA Style

Alaitz Linares-Unamunzaga, Hernán Gonzalo-Orden, Jesús Díaz Minguela, Heriberto Pérez-Acebo. New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials. Applied Sciences. 2018; 8 (6):970.

Chicago/Turabian Style

Alaitz Linares-Unamunzaga; Hernán Gonzalo-Orden; Jesús Díaz Minguela; Heriberto Pérez-Acebo. 2018. "New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials." Applied Sciences 8, no. 6: 970.

Journal article
Published: 01 January 2018 in Ingeniería e Investigación
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A wide variety of modifiers have been applied to bitumen in order to enhance their properties and performance. Among them, polymers have been mainly used. The aim of this paper is to assess the use of polyurethane foam waste as a bitumen modifier for hot mix asphalts. The polyurethane foam is a by-product of the manufacturing of polyurethane for thermal insulation. From a bitumen with a penetration grade of 50/70, various samples with percentages of waste material in weight ranging from 1% to 5% were produced and tested. Samples with 5% of waste material or more became rough and were refused due to their poor workability. A bituminous mixture with modified bitumen with a 4% of polyurethane was manufactured and compared with a sample with the same aggregates and original bitumen. Results in Marshall test showed that a mix with polymer modified bitumen yielded improvements in stability and a lower deformability. This result suggests that the employment of polyurethane foam waste is a promising bitumen modifier, contributing also to recycle waste materials.

ACS Style

Miguel Ángel Salas; Heriberto Pérez-Acebo; Verónica Calderón; Hernán Gonzalo-Orden. Bitumen modified with recycled polyurethane foam for employment in hot mix asphalt. Ingeniería e Investigación 2018, 38, 60 -66.

AMA Style

Miguel Ángel Salas, Heriberto Pérez-Acebo, Verónica Calderón, Hernán Gonzalo-Orden. Bitumen modified with recycled polyurethane foam for employment in hot mix asphalt. Ingeniería e Investigación. 2018; 38 (1):60-66.

Chicago/Turabian Style

Miguel Ángel Salas; Heriberto Pérez-Acebo; Verónica Calderón; Hernán Gonzalo-Orden. 2018. "Bitumen modified with recycled polyurethane foam for employment in hot mix asphalt." Ingeniería e Investigación 38, no. 1: 60-66.

Journal article
Published: 07 November 2017 in Membranes
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A bibliometric analysis based on Scopus database was performed to identify the global research trends related to Supported Ionic Liquid Membranes (SILMs) during the time period from 1995 to 2015. This work tries to improve the understanding of the most relevant research topics and applications. The results from the analysis reveal that only after 2005 the research efforts focused on SILMs became significant, since the references found before that year are scarce. The most important research works on the four main application groups for SILMs defined in this work (carbon dioxide separation, other gas phase separations, pervaporation and liquid phase separations) were summarized in this paper. Carbon dioxide separation appeared as the application that has received by far the most attention according to the research trends during the analysed period. Comments about other significant applications that are gaining attention, such as the employment of SILMs in analytical tasks or their consideration for the production of fuel cells, have been included.

ACS Style

Ricardo Abejón; Heriberto Pérez-Acebo; Aurora Garea. A Bibliometric Analysis of Research on Supported Ionic Liquid Membranes during the 1995–2015 Period: Study of the Main Applications and Trending Topics. Membranes 2017, 7, 63 .

AMA Style

Ricardo Abejón, Heriberto Pérez-Acebo, Aurora Garea. A Bibliometric Analysis of Research on Supported Ionic Liquid Membranes during the 1995–2015 Period: Study of the Main Applications and Trending Topics. Membranes. 2017; 7 (4):63.

Chicago/Turabian Style

Ricardo Abejón; Heriberto Pérez-Acebo; Aurora Garea. 2017. "A Bibliometric Analysis of Research on Supported Ionic Liquid Membranes during the 1995–2015 Period: Study of the Main Applications and Trending Topics." Membranes 7, no. 4: 63.