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One of the prime objectives of this review is to understand the role of design parameters on the mechanical properties (Compressive and split tensile strength) of Self-Compacting Concrete (SCC) with recycled aggregates (Recycled Coarse Aggregates (RCA) and Recycled Fine Aggregates (RFA)). The design parameters considered for review are Water to Cement (W/C) ratio, Water to Binder (W/B) ratio, Total Aggregates to Cement (TA/C) ratio, Fine Aggregate to Coarse Aggregate (FA/CA) ratio, Water to Solid (W/S) ratio in percentage, superplasticizer (SP) content (kg/cu.m), replacement percentage of RCA, and replacement percentage of RFA. It is observed that with respect to different grades of SCC, designed parameters affect the mechanical properties of SCC with recycled aggregates.
P. Jagadesh; Andrés Juan-Valdés; M. Guerra-Romero; Julia Morán-Del Pozo; Julia García-González; Rebeca Martínez-García. Effect of Design Parameters on Compressive and Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate: An Overview. Applied Sciences 2021, 11, 6028 .
AMA StyleP. Jagadesh, Andrés Juan-Valdés, M. Guerra-Romero, Julia Morán-Del Pozo, Julia García-González, Rebeca Martínez-García. Effect of Design Parameters on Compressive and Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate: An Overview. Applied Sciences. 2021; 11 (13):6028.
Chicago/Turabian StyleP. Jagadesh; Andrés Juan-Valdés; M. Guerra-Romero; Julia Morán-Del Pozo; Julia García-González; Rebeca Martínez-García. 2021. "Effect of Design Parameters on Compressive and Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate: An Overview." Applied Sciences 11, no. 13: 6028.
This study analyses the potential of a new eco-friendly bioproduct to construction sustainability and its contribution for improving the fresh and hardened properties of cement mortar. The bioproduct was obtained from biomass grown using crude glycerol (biodiesel production waste). With similar functionality than petrochemical-based additions, these bioproducts encourage the decrease on the use of fossil-based raw materials with the concomitant reduction in their carbon footprint. The effect of bioproduct's sonication and storage for 3 day at 4 °C were assessed. Properties such as consistence, porosity, density, compressive and flexural strength, water droplet absorption, capillary absorption, drying rate, thermal conductivity and ultrasonic pulse velocity of the bioformulated mortars were compared with a control cement mortar. The findings show that the bioproducts can be used as renewable and eco-friendly alternative to petrochemical-based polymer admixtures to lengthen mortar service life, even after storage. Sonicated bioproduct improved the water related mortar properties, while non-sonicated bioproduct developed higher mechanical properties. Contributing for a cleaner production of cementitious products, an original waste from chemical industry was transformed into a valuable raw material for use in the construction industry.
Julia García-González; Paulina Faria; Alice S. Pereira; Paulo C. Lemos; Julia Mª Morán-Del Pozo; M. Ignacio Guerra-Romero; Andrés Juan-Valdés. Sustainable cement mortar bioformulated with a bioproduct obtained from fermentation of biodiesel’ crude glycerol. Journal of Cleaner Production 2021, 313, 127885 .
AMA StyleJulia García-González, Paulina Faria, Alice S. Pereira, Paulo C. Lemos, Julia Mª Morán-Del Pozo, M. Ignacio Guerra-Romero, Andrés Juan-Valdés. Sustainable cement mortar bioformulated with a bioproduct obtained from fermentation of biodiesel’ crude glycerol. Journal of Cleaner Production. 2021; 313 ():127885.
Chicago/Turabian StyleJulia García-González; Paulina Faria; Alice S. Pereira; Paulo C. Lemos; Julia Mª Morán-Del Pozo; M. Ignacio Guerra-Romero; Andrés Juan-Valdés. 2021. "Sustainable cement mortar bioformulated with a bioproduct obtained from fermentation of biodiesel’ crude glycerol." Journal of Cleaner Production 313, no. : 127885.
The large increase in the world population has resulted in a very large amount of construction waste, as well as a large amount of waste glycerol from transesterification reactions of acyl glycerides from oils and fats, in particular from the production of biodiesel. Only a limited percentage of these two residues are recycled, which generates a large management problem worldwide. For that reason, in this study, we used crude glycerol as a carbon source to cultivate polyhydroxyalkanoates (PHA)-producing mixed microbial cultures (MMC). Two bioproducts derived from these cultures were applied on the surface of concrete with recycled aggregate to create a protective layer. To evaluate the effect of the treatments, tests of water absorption by capillarity and under low pressure with Karsten tubes were performed. Furthermore, SEM-EDS analysis showed the physical barrier caused by biotreatments that produced a reduction on capillarity water absorption of up to 20% and improved the impermeability of recycled concrete against the penetration of water under pressure up to 2.7 times relative to the reference. Therefore, this bioproduct shown to be a promising treatment to protect against penetration of water to concrete surfaces increasing its durability and useful life.
Lorena Serrano-González; Daniel Merino-Maldonado; Manuel Guerra-Romero; Julia Morán-Del Pozo; Paulo Lemos; Alice Pereira; Paulina Faria; Julia García-González; Andrés Juan-Valdés. Use of Bioproducts Derived from Mixed Microbial Cultures Grown with Crude Glycerol to Protect Recycled Concrete Surfaces. Materials 2021, 14, 2057 .
AMA StyleLorena Serrano-González, Daniel Merino-Maldonado, Manuel Guerra-Romero, Julia Morán-Del Pozo, Paulo Lemos, Alice Pereira, Paulina Faria, Julia García-González, Andrés Juan-Valdés. Use of Bioproducts Derived from Mixed Microbial Cultures Grown with Crude Glycerol to Protect Recycled Concrete Surfaces. Materials. 2021; 14 (8):2057.
Chicago/Turabian StyleLorena Serrano-González; Daniel Merino-Maldonado; Manuel Guerra-Romero; Julia Morán-Del Pozo; Paulo Lemos; Alice Pereira; Paulina Faria; Julia García-González; Andrés Juan-Valdés. 2021. "Use of Bioproducts Derived from Mixed Microbial Cultures Grown with Crude Glycerol to Protect Recycled Concrete Surfaces." Materials 14, no. 8: 2057.
One of the growing demands in concrete manufacture is the availability of natural fine aggregates, which account for 35% to 45% of the total concrete. An alternative method of disposal of fine recycled concrete aggregates (FRCA) generated from demolition and construction waste (C&DW) is their usage in mortar and the development of recycled mortar. The main aim of this research work is to evaluate the viability of incorporating FRCA from urban C&DW for the manufacture of cement-based mortars. Simple processing techniques like washing and sieving are adopted to improve the FRCA quality. Physical and chemical characterization of ingredients is carried out. In total four mixes of 1:3 (cement: sand) mortar with partial replacement of normalized sand with FRCA (0%, 25%, 50%, and 100%) are evaluated for mechanical properties. Water to cement ratio for all four mortar mixes are determined by fixed consistency. Mechanical and physical properties like density, compressive strength, and flexural strength are studied for various curing periods, and the result is that the optimum usage of FRCA is 25% based on a 90-day curing period.
Rebeca Martínez-García; María Rojas; Julia Pozo; Fernando Fraile-Fernández; Andrés Juan-Valdés. Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA). Sustainability 2021, 13, 414 .
AMA StyleRebeca Martínez-García, María Rojas, Julia Pozo, Fernando Fraile-Fernández, Andrés Juan-Valdés. Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA). Sustainability. 2021; 13 (1):414.
Chicago/Turabian StyleRebeca Martínez-García; María Rojas; Julia Pozo; Fernando Fraile-Fernández; Andrés Juan-Valdés. 2021. "Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA)." Sustainability 13, no. 1: 414.
This article presents an overview of the bibliographic picture of the design parameter’s influence on the mix proportion of self-compacting concrete with recycled aggregate. Design parameters like water-cement ratio, water to paste ratio, and percentage of superplasticizers are considered in this review. Standardization and recent research on the usage of recycled aggregates in self-compacting concrete (SCC) exploit its significance in the construction sector. The usage of recycled aggregate not only resolves the negative impacts on the environment but also prevents the usage of natural resources. Furthermore, it is necessary to understand the recycled aggregate property’s role in a mixed design and SCC properties. Design parameters are not only influenced by a mix design but also play a key role in SCC’s fresh properties. Hence, in this overview, properties of SCC ingredients, calculation of design parameters in mix design, the effect of design parameters on fresh concrete properties, and the evolution of fresh concrete properties are studied.
Rebeca Martínez-García; P. Jagadesh; Fernando J. Fraile-Fernández; Julia M. Morán-Del Pozo; Andrés Juan-Valdés. Influence of Design Parameters on Fresh Properties of Self-Compacting Concrete with Recycled Aggregate—A Review. Materials 2020, 13, 5749 .
AMA StyleRebeca Martínez-García, P. Jagadesh, Fernando J. Fraile-Fernández, Julia M. Morán-Del Pozo, Andrés Juan-Valdés. Influence of Design Parameters on Fresh Properties of Self-Compacting Concrete with Recycled Aggregate—A Review. Materials. 2020; 13 (24):5749.
Chicago/Turabian StyleRebeca Martínez-García; P. Jagadesh; Fernando J. Fraile-Fernández; Julia M. Morán-Del Pozo; Andrés Juan-Valdés. 2020. "Influence of Design Parameters on Fresh Properties of Self-Compacting Concrete with Recycled Aggregate—A Review." Materials 13, no. 24: 5749.
The concept of construction and demolition waste (CDW) embodies a vast amount of residues, among which the ceramic materials (mainly, bricks and tiles) are an important part as, in many countries of the European Union, they represent more than 50% of the total. Therefore, the reutilization of this type of waste is one of the most important challenges faced by the construction sector within the circular economy paradigm. This research work deals with a dual reutilization of the CDW ceramic fraction: firstly, as coarse recycled aggregates and, secondly, through the use of clay brick powder as a pozzolanic addition to the cement. Thus, two different recycled concrete mixtures were produced: (1) with a 50% partial substitution of the natural coarse aggregates (RC-RA) and (2) with a 50% substitution of the natural coarse aggregates and a 25% substitution of the ordinary Portland cement (RC-RAC). The mechanical performance (consistency, density and compressive strength) and microstructural properties such as porosity, elemental mapping analysis, hydration products and interfacial transition zones (ITZ) were assessed and compared with a control concrete (CC). It was revealed that the recycled concretes incorporating ceramic as secondary materials have a comparable performance level to the one exhibited by the conventional concrete at 28 days, in part due to their pozzolanic characteristics but also due to a lower effective w/c ratio, which demonstrates their potential for reuse and possible contribution to the circular economy.
Andrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; M. Isabel Sánchez De Rojas Gómez; M. Ignacio Guerra-Romero; Nele De Belie; Julia M. Morán-Del Pozo. Mechanical and microstructural properties of recycled concretes mixed with ceramic recycled cement and secondary recycled aggregates. A viable option for future concrete. Construction and Building Materials 2020, 270, 121455 .
AMA StyleAndrés Juan-Valdés, Desirée Rodríguez-Robles, Julia García-González, M. Isabel Sánchez De Rojas Gómez, M. Ignacio Guerra-Romero, Nele De Belie, Julia M. Morán-Del Pozo. Mechanical and microstructural properties of recycled concretes mixed with ceramic recycled cement and secondary recycled aggregates. A viable option for future concrete. Construction and Building Materials. 2020; 270 ():121455.
Chicago/Turabian StyleAndrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; M. Isabel Sánchez De Rojas Gómez; M. Ignacio Guerra-Romero; Nele De Belie; Julia M. Morán-Del Pozo. 2020. "Mechanical and microstructural properties of recycled concretes mixed with ceramic recycled cement and secondary recycled aggregates. A viable option for future concrete." Construction and Building Materials 270, no. : 121455.
The use of construction and demolition wastes (C&DW) is a trending future option for the sustainability of construction. In this context, a number of works deal with the use of recycled concrete aggregates to produce concrete for structural and non-structural purposes. Nowadays, an important number of C&DW management plants in the European Union (EU) and other countries have developed robust protocols to obtain high-quality coarse recycled aggregates that comply with different European standards in order to be used to produce new concrete. The development of self-compacting concrete (SCC) is another way to boost the sustainability of construction, due to the important reduction of energy employed. Using recycled aggregates is a relatively recent scientific area, however, studies on this material in the manufacture of self-compacting concrete have proven the feasibility thereof for conventional structural elements as well as high-performance and complex structural elements, densely reinforced structures, difficult-to-access formwork and difficult-to-vibrate elements. This paper presents an original study on the use of coarse recycled concrete aggregate (CRA) to obtain self-compacting concrete. Concrete with substitution ratios of 20%, 50% and 100% are compared with a control concrete. The purpose of this comparison is to check the influence of CRA on fresh SCC as well as its physical and mechanical properties. The parameters studied are material characterization, self-compactability, compressive strength, and tensile and flexural strength of the resulting concrete. The results conclude that it is feasible to use CRA for SCC production with minimal losses in the characteristics.
Rebeca Martínez-García; M. Ignacio Guerra-Romero; Julia M. Morán-Del Pozo; Jorge De Brito; Andrés Juan-Valdés. Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option. Materials 2020, 13, 868 .
AMA StyleRebeca Martínez-García, M. Ignacio Guerra-Romero, Julia M. Morán-Del Pozo, Jorge De Brito, Andrés Juan-Valdés. Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option. Materials. 2020; 13 (4):868.
Chicago/Turabian StyleRebeca Martínez-García; M. Ignacio Guerra-Romero; Julia M. Morán-Del Pozo; Jorge De Brito; Andrés Juan-Valdés. 2020. "Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option." Materials 13, no. 4: 868.
This manuscript reports a study of the capacity of polymer composites to increase flexural strength in concrete. The polymer composites reinforced with carbon fiber and bonded with epoxy adhesive were used in prismatic test specimens of mass concrete corresponding to two different morphologies. The aim was to simulate the restoration of deteriorating concrete agricultural structures in order to explore the viability of this alternative against replacing them. An increase was found in the strength of the elements tested, with a higher strength being observed in those test specimens presenting a modified geometry.
Andrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; Manuel Ignacio Guerra-Romero; Julia Mͣ Morán-Del Pozo. Influence of the use of External Carbon Fiber Reinforcement on the Flexural Behavior of Prismatic Concrete Test Specimens. An Application for Repairing of Deteriorated Agricultural Structures. Materials 2019, 12, 1894 .
AMA StyleAndrés Juan-Valdés, Desirée Rodríguez-Robles, Julia García-González, Manuel Ignacio Guerra-Romero, Julia Mͣ Morán-Del Pozo. Influence of the use of External Carbon Fiber Reinforcement on the Flexural Behavior of Prismatic Concrete Test Specimens. An Application for Repairing of Deteriorated Agricultural Structures. Materials. 2019; 12 (12):1894.
Chicago/Turabian StyleAndrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; Manuel Ignacio Guerra-Romero; Julia Mͣ Morán-Del Pozo. 2019. "Influence of the use of External Carbon Fiber Reinforcement on the Flexural Behavior of Prismatic Concrete Test Specimens. An Application for Repairing of Deteriorated Agricultural Structures." Materials 12, no. 12: 1894.
This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two different mixes were used: the first one was a conventional concrete mix provided by Prefabricados de Hormigón Pavimentos Páramo S.L., one of the collaborating companies in this study, and the other was a mixture in which wt 50% of the natural coarse aggregates were substituted for recycled mixed aggregates ceramic (RMAc). This recycled aggregate is a heterogeneous mixture of unbound aggregates, concrete, ceramic, etc., used as a secondary recycled aggregate and commonly produced in a lot of recycling plants in many European countries. This material was supplied by Tecnología y Reciclado S.L., the other collaborating company. Both mixtures were representative in order to establish the comparative behavior between them, taking into account that smaller percentages of replacement of the natural with recycled aggregates will also produce good results. This percentage of substitution represents a high saving of natural resources (gravel) and maintains a balanced behavior of the recycled concrete, so this new material can be considered to be a viable and reliable option for precast mass concrete paving elements. The characterization of the recycled precast elements, covering mechanical, microstructural, and durability properties, showed mostly similar behavior when compared to the analogous industrially-produced pieces made with conventional concrete.
Andrés Juan-Valdés; Julia García-González; Desirée Rodríguez-Robles; Manuel Ignacio Guerra-Romero; Fernando López Gayarre; Nele De Belie; Julia M. Morán-Del Pozo. Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW). Materials 2018, 12, 24 .
AMA StyleAndrés Juan-Valdés, Julia García-González, Desirée Rodríguez-Robles, Manuel Ignacio Guerra-Romero, Fernando López Gayarre, Nele De Belie, Julia M. Morán-Del Pozo. Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW). Materials. 2018; 12 (1):24.
Chicago/Turabian StyleAndrés Juan-Valdés; Julia García-González; Desirée Rodríguez-Robles; Manuel Ignacio Guerra-Romero; Fernando López Gayarre; Nele De Belie; Julia M. Morán-Del Pozo. 2018. "Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW)." Materials 12, no. 1: 24.
The pressure caused by the construction activities has begun to take its toll on the environment. One option to alleviate the negative impacts is to reuse the construction and demolition wastes as recycled aggregate in the manufacture of non-structural concrete. Therefore, this research compares the recycled kerbstones and paving blocks made with a 50% replacement ratio of pre-saturated recycled mixed ceramic aggregates to the conventional non-structural precast concrete elements. Although some decreases in compressive (−25.47%) and flexural strength (−5.77%) were observed, the splitting tensile strength (0.53%), the strong bond exhibited by the ITZ between the recycled aggregates and the cement paste and the relatively low porosity (12.44% with a small volume of pores greater than 2 μm) showed promising results; thus proving the viability of using recycled kerbstones and paving blocks.
Andrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; Manuel Ignacio Guerra-Romero; Julia María Morán del Pozo. Mechanical and microstructural characterization of non-structural precast concrete made with recycled mixed ceramic aggregates from construction and demolition wastes. Journal of Cleaner Production 2018, 180, 482 -493.
AMA StyleAndrés Juan-Valdés, Desirée Rodríguez-Robles, Julia García-González, Manuel Ignacio Guerra-Romero, Julia María Morán del Pozo. Mechanical and microstructural characterization of non-structural precast concrete made with recycled mixed ceramic aggregates from construction and demolition wastes. Journal of Cleaner Production. 2018; 180 ():482-493.
Chicago/Turabian StyleAndrés Juan-Valdés; Desirée Rodríguez-Robles; Julia García-González; Manuel Ignacio Guerra-Romero; Julia María Morán del Pozo. 2018. "Mechanical and microstructural characterization of non-structural precast concrete made with recycled mixed ceramic aggregates from construction and demolition wastes." Journal of Cleaner Production 180, no. : 482-493.
Julia García-González; Desirée Rodríguez-Robles; Jianyun Wang; Nele De Belie; Julia María Morán del Pozo; M. Ignacio Guerra-Romero; Andrés Juan-Valdés. Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate. Construction and Building Materials 2017, 154, 1015 -1023.
AMA StyleJulia García-González, Desirée Rodríguez-Robles, Jianyun Wang, Nele De Belie, Julia María Morán del Pozo, M. Ignacio Guerra-Romero, Andrés Juan-Valdés. Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate. Construction and Building Materials. 2017; 154 ():1015-1023.
Chicago/Turabian StyleJulia García-González; Desirée Rodríguez-Robles; Jianyun Wang; Nele De Belie; Julia María Morán del Pozo; M. Ignacio Guerra-Romero; Andrés Juan-Valdés. 2017. "Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate." Construction and Building Materials 154, no. : 1015-1023.
J. García-González; T. Barroqueiro; Luis Evangelista; J. De Brito; N. De Belie; Julia María Morán del Pozo; Andres Juan. Fracture energy of coarse recycled aggregate concrete using the wedge splitting test method: influence of water-reducing admixtures. Materials and Structures 2016, 50, 1 .
AMA StyleJ. García-González, T. Barroqueiro, Luis Evangelista, J. De Brito, N. De Belie, Julia María Morán del Pozo, Andres Juan. Fracture energy of coarse recycled aggregate concrete using the wedge splitting test method: influence of water-reducing admixtures. Materials and Structures. 2016; 50 (2):1.
Chicago/Turabian StyleJ. García-González; T. Barroqueiro; Luis Evangelista; J. De Brito; N. De Belie; Julia María Morán del Pozo; Andres Juan. 2016. "Fracture energy of coarse recycled aggregate concrete using the wedge splitting test method: influence of water-reducing admixtures." Materials and Structures 50, no. 2: 1.
The reuse of construction and demolition wastes as replacement for natural coarse aggregate in the production of recycled concrete has been spreading worldwide as a method for recycling waste materials. However, recycled aggregates are of higher porosity than natural aggregates, which can decrease the mechanical properties and durability of recycled concrete. The study reported in this paper compared the porosity and pore size distributions of a control concrete and concretes made with different replacement levels of natural coarse aggregates. The research intended to relate the influence of the aforementioned aspects on mechanical and durability characteristics by assessing the compressive strength and the capillary water absorption of each concrete mix. Although there was a decline in compressive strength, the recycled concretes exceeded the design strength grade of 25 MPa. It was also found that recycled concrete possessed a higher capillary water absorption, which was more pronounced in the short term due to the presence of capillary pores but was less significant in the long term as the presence of macropores in both concrete mixes was very similar. DOI: 10.1680/macr.14.00218 Document Type: Research Article Format: PDF,HTML
Julia García-González; Desirée Rodríguez-Robles; Julia Mª Morán-Del Pozo; Andrés Juan-Valdés; M. Ignacio Guerra-Romero. Porosity and pore size distribution in recycled concrete. Magazine of Concrete Research 2015, 67, 1 -8.
AMA StyleJulia García-González, Desirée Rodríguez-Robles, Julia Mª Morán-Del Pozo, Andrés Juan-Valdés, M. Ignacio Guerra-Romero. Porosity and pore size distribution in recycled concrete. Magazine of Concrete Research. 2015; 67 (22):1-8.
Chicago/Turabian StyleJulia García-González; Desirée Rodríguez-Robles; Julia Mª Morán-Del Pozo; Andrés Juan-Valdés; M. Ignacio Guerra-Romero. 2015. "Porosity and pore size distribution in recycled concrete." Magazine of Concrete Research 67, no. 22: 1-8.
Julia García-González; Desirée Rodríguez-Robles; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. Porosity and pore size distribution in recycled concrete. Magazine of Concrete Research 2015, 67, 1214 -1221.
AMA StyleJulia García-González, Desirée Rodríguez-Robles, Andres Juan, Julia María Morán del Pozo, Manuel Ignacio Guerra Romero. Porosity and pore size distribution in recycled concrete. Magazine of Concrete Research. 2015; 67 (22):1214-1221.
Chicago/Turabian StyleJulia García-González; Desirée Rodríguez-Robles; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. 2015. "Porosity and pore size distribution in recycled concrete." Magazine of Concrete Research 67, no. 22: 1214-1221.
The use of construction and demolition waste in concrete manufacture allows the concept of sustainability to be included in the construction industry and helps to alleviate both the large consumption of natural resources and the high generation of waste. The present research assesses first the suitability of two different mixed recycled aggregates as coarse aggregates for concrete according to the code on structural concrete (EHE-08), and subsequently evaluates the effect of their use as a partial (50%) replacement of natural coarse aggregate (gravel) on the mechanical properties (compressive strength, splitting-tensile strength, flexural strength, stress–strain curves and modulus of elasticity) in concrete mixes of 25 MPa strength grade. The secondary material characterisation shows that, although presenting promising properties in terms of granulometry, particle size, density and shape, the recycled aggregates should be pretreated in order to comply with the quality of fines and water absorption, and their resistance to fragmentation limits their application in concrete mixes with a strength grade below 30 MPa. Regarding the results of the tests performed on the hardened concrete, the values obtained suggest that the use of mixed recycled aggregates is feasible, but at the expense of minor losses of the mechanical characteristics.
Desirée Rodríguez-Robles; Julia García-González; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. Effect of mixed recycled aggregates on mechanical properties of recycled concrete. Magazine of Concrete Research 2015, 67, 247 -256.
AMA StyleDesirée Rodríguez-Robles, Julia García-González, Andres Juan, Julia María Morán del Pozo, Manuel Ignacio Guerra Romero. Effect of mixed recycled aggregates on mechanical properties of recycled concrete. Magazine of Concrete Research. 2015; 67 (5):247-256.
Chicago/Turabian StyleDesirée Rodríguez-Robles; Julia García-González; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. 2015. "Effect of mixed recycled aggregates on mechanical properties of recycled concrete." Magazine of Concrete Research 67, no. 5: 247-256.
The construction sector comprises a number of activities that may result in environmental impacts of considerable magnitude, waste generation being one of the major negative effects of this industry due to the large streams generated. Proper knowledge of the environmental problem caused by the sector is of great importance in order to achieve an effective waste management. Thus, this paper analyse the Spanish situation regarding construction and demolition waste (CDW) compared with other European Union countries; which sets out the current figures of the CDW scenario (legislation, generation, composition, treatment and market) as well as the difficulties encountered when handling this residue.
Desirée Rodríguez-Robles; Julia García-González; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. Overview regarding construction and demolition waste in Spain. Environmental Technology 2014, 36, 3060 -3070.
AMA StyleDesirée Rodríguez-Robles, Julia García-González, Andres Juan, Julia María Morán del Pozo, Manuel Ignacio Guerra Romero. Overview regarding construction and demolition waste in Spain. Environmental Technology. 2014; 36 (23):3060-3070.
Chicago/Turabian StyleDesirée Rodríguez-Robles; Julia García-González; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. 2014. "Overview regarding construction and demolition waste in Spain." Environmental Technology 36, no. 23: 3060-3070.
The manufacture of any kind of product inevitably entails the production of waste. The quantity of waste generated by the ceramic industry, a very important sector in Spain, is between 5% and 8% of the final output and it is therefore necessary to find an effective waste recovery method. The aim of the study reported in the present article was to seek a sustainable means of managing waste from the ceramic industry through the incorporation of this type of waste in the total replacement of conventional aggregate (gravel) used in structural concrete. Having verified that the recycled ceramic aggregates met all the technical requirements imposed by current Spanish legislation, established in the Code on Structural Concrete (EHE-08), then it is prepared a control concrete mix and the recycled concrete mix using 100% recycled ceramic aggregate instead of coarse natural aggregate. The concretes obtained were subjected to the appropriate tests in order to conduct a comparison of their mechanical properties. The results show that the concretes made using ceramic sanitary ware aggregate possessed the same mechanical properties as those made with conventional aggregate. It is therefore possible to conclude that the reuse of recycled ceramic aggregate to produce recycled concrete is a feasible alternative for the sustainable management of this waste.
Julia García-González; Desirée Rodríguez-Robles; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. Ceramic ware waste as coarse aggregate for structural concrete production. Environmental Technology 2014, 36, 3050 -3059.
AMA StyleJulia García-González, Desirée Rodríguez-Robles, Andres Juan, Julia María Morán del Pozo, Manuel Ignacio Guerra Romero. Ceramic ware waste as coarse aggregate for structural concrete production. Environmental Technology. 2014; 36 (23):3050-3059.
Chicago/Turabian StyleJulia García-González; Desirée Rodríguez-Robles; Andres Juan; Julia María Morán del Pozo; Manuel Ignacio Guerra Romero. 2014. "Ceramic ware waste as coarse aggregate for structural concrete production." Environmental Technology 36, no. 23: 3050-3059.
The replacement of natural aggregates by recycled aggregates in the concrete manufacturing has been spreading worldwide as a recycling method to counteract the large amount of construction and demolition waste. Although legislation in this field is still not well developed, many investigations demonstrate the possibilities of success of this trend given that concrete with satisfactory mechanical and durability properties could be achieved. However, recycled aggregates present a low quality compared to natural aggregates, the water absorption being their main drawback. When used untreated in concrete mix, the recycled aggregate absorb part of the water initially calculated for the cement hydration, which will adversely affect some characteristics of the recycled concrete. This article seeks to demonstrate that the technique of pre-saturation is able to solve the aforementioned problem. In order to do so, the water absorption of the aggregates was tested to determine the necessary period of soaking to bring the recycled aggregates into a state of suitable humidity for their incorporation into the mixture. Moreover, several concrete mixes were made with different replacement percentages of natural aggregate and various periods of pre-saturation. The consistency and compressive strength of the concrete mixes were tested to verify the feasibility of the proposed technique.
Julia García-González; Desirée Rodríguez-Robles; Andrés Juan-Valdés; Julia Mª Morán-Del Pozo; Manuel Ignacio Guerra Romero. Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture. Materials 2014, 7, 6224 -6236.
AMA StyleJulia García-González, Desirée Rodríguez-Robles, Andrés Juan-Valdés, Julia Mª Morán-Del Pozo, Manuel Ignacio Guerra Romero. Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture. Materials. 2014; 7 (9):6224-6236.
Chicago/Turabian StyleJulia García-González; Desirée Rodríguez-Robles; Andrés Juan-Valdés; Julia Mª Morán-Del Pozo; Manuel Ignacio Guerra Romero. 2014. "Pre-Saturation Technique of the Recycled Aggregates: Solution to the Water Absorption Drawback in the Recycled Concrete Manufacture." Materials 7, no. 9: 6224-6236.
Construction and demolition waste (CDW) constitutes an increasingly significant problem in society due to the volume generated, rendering sustainable management and disposal problematic. The aim of this study is to identify a possible reuse option in the concrete manufacturing for recycled aggregates with a significant ceramic content: mixed recycled aggregates (MixRA) and ceramic recycled aggregates (CerRA). In order to do so, several tests are conducted in accordance with the Spanish Code on Structural Concrete (EHE-08) to determine the composition in weight and physic-mechanical characteristics (particle size distributions, fine content, sand equivalent, density, water absorption, flakiness index, and resistance to fragmentation) of the samples for the partial inclusion of the recycled aggregates in concrete mixes. The results of these tests clearly support the hypothesis that this type of material may be suitable for such partial replacements if simple pretreatment is carried out. Furthermore, this measure of reuse is in line with European, national, and regional policies on sustainable development, and presents a solution to the environmental problem caused by the generation of CDW.
Desirée Rodríguez-Robles; Julia García-González; Andrés Juan-Valdés; Julia Mª Morán-Del Pozo; Manuel I Guerra-Romero. Quality Assessment of Mixed and Ceramic Recycled Aggregates from Construction and Demolition Wastes in the Concrete Manufacture According to the Spanish Standard. Materials 2014, 7, 5843 -5857.
AMA StyleDesirée Rodríguez-Robles, Julia García-González, Andrés Juan-Valdés, Julia Mª Morán-Del Pozo, Manuel I Guerra-Romero. Quality Assessment of Mixed and Ceramic Recycled Aggregates from Construction and Demolition Wastes in the Concrete Manufacture According to the Spanish Standard. Materials. 2014; 7 (8):5843-5857.
Chicago/Turabian StyleDesirée Rodríguez-Robles; Julia García-González; Andrés Juan-Valdés; Julia Mª Morán-Del Pozo; Manuel I Guerra-Romero. 2014. "Quality Assessment of Mixed and Ceramic Recycled Aggregates from Construction and Demolition Wastes in the Concrete Manufacture According to the Spanish Standard." Materials 7, no. 8: 5843-5857.
One of the bases of sustainable development is the responsible management of natural resources, and this is the approach which has been adopted by developed countries as regards management of all kinds of waste, through the establishment of management strategies based on prevention, reuse and recycling. This article present the results of a physical, chemical and geotechnical characterization of colliery spoils stored in slag heaps in the Ciñera-Matallana coal mining area in León, Spain. The primary objectives of this research were to determine the suitability of this mining waste for use as granular material in rural and civil engineering infrastructures and to classify it according to national and international road construction standards. On the basis of the results obtained, they are proposed several possible uses (foundation and core layers in track and road embankments, granular sub-base for light traffic and top layers of embankments), although it should be noted the need for mechanical treatments as crushing or sieving and the recommendation of use of sulphate resistant cement to avoid the possible problems.
Joaquín Ferreras Cadierno; Manuel Ignacio Guerra Romero; Andrés Juan Valdés; Julia María Morán del Pozo; Julia García González; Desirée Rodríguez Robles; José Vallepuga-Espinosa. Characterization of Colliery Spoils in León: Potential Uses in Rural Infrastructures. Geotechnical and Geological Engineering 2014, 32, 439 -452.
AMA StyleJoaquín Ferreras Cadierno, Manuel Ignacio Guerra Romero, Andrés Juan Valdés, Julia María Morán del Pozo, Julia García González, Desirée Rodríguez Robles, José Vallepuga-Espinosa. Characterization of Colliery Spoils in León: Potential Uses in Rural Infrastructures. Geotechnical and Geological Engineering. 2014; 32 (2):439-452.
Chicago/Turabian StyleJoaquín Ferreras Cadierno; Manuel Ignacio Guerra Romero; Andrés Juan Valdés; Julia María Morán del Pozo; Julia García González; Desirée Rodríguez Robles; José Vallepuga-Espinosa. 2014. "Characterization of Colliery Spoils in León: Potential Uses in Rural Infrastructures." Geotechnical and Geological Engineering 32, no. 2: 439-452.