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The suitability of replacing mineral aggregate with carbon-negative ones mainly depends on the properties of the aggregates produced from waste recycling, reducing CO2 emissions. This study aimed to investigate the predictive approaches adapted to concrete mixtures where mineral aggregates are replaced by carbonated aggregates (at different substitution rates from 25 to 100% with aggregates of various origins). A large experimental campaign of aggregates and carbonated aggregate concretes highlighted their physical, mechanical, thermal and hygric properties and the influence of density and porosity of aggregates on these properties. Thanks to these results, predictive approaches were formulated to establish the main engineering properties: mechanical compressive strength, elasticity modulus, thermal conductivity, thermal mass capacity and hygric diffusivity. These empirical and analytical models were based on the density of aggregates. Maximum deviations of around 15% were obtained with the experimental data, highlighting the influence of grain density on carbonated aggregate concretes. These models could then be used to optimize the formulation of concrete mixtures with carbonated aggregates, replacing international standards adapted to mineral aggregates.
Imen Rahmouni; Geoffrey Promis; Omar Douzane; Frédéric Rosquoet. Grain Density-Based Approaches to Predict the Mechanical, Thermal and Hygric Properties of Carbon-Negative Aggregate Concretes. Sustainability 2021, 13, 8194 .
AMA StyleImen Rahmouni, Geoffrey Promis, Omar Douzane, Frédéric Rosquoet. Grain Density-Based Approaches to Predict the Mechanical, Thermal and Hygric Properties of Carbon-Negative Aggregate Concretes. Sustainability. 2021; 13 (15):8194.
Chicago/Turabian StyleImen Rahmouni; Geoffrey Promis; Omar Douzane; Frédéric Rosquoet. 2021. "Grain Density-Based Approaches to Predict the Mechanical, Thermal and Hygric Properties of Carbon-Negative Aggregate Concretes." Sustainability 13, no. 15: 8194.
Signs of wetness in housing are a significant obstacle to the renovation and energy rehabilitation of old and energy-intensive heritage buildings, especially in cold climates. Thus, in order to avoid the numerous possibilities of degradation caused by the moisture transfer phenomena in the building envelope, the a disruptive aeraulic process, which focuses on the ventilation of an air gap between the thermal insulation and the wet wall, has been designed and its assessed. This system avoids the presence of liquid water at the wall surface by maintaining the hygrothermal balance within the wet wall. This enables the mechanical durability of the supporting structure, the absence of biological activity and/or frost and, hence, the durability of the thermal insulation. These issues are investigated through a case study based on a real site. Over a year of measurements, the wet wall was constantly maintained in hygroscopic balance, around 90% RH, guaranteeing the preservation of its mechanical performance, while the insulation layer was kept moisture free. In addition, the proposed model for predicting the appearance and development of biological activity demonstrated its validity, confirming experimental results.These initial results will now lead to the optimization of the aeraulic device, as well as possible use in a summer cooling context to achieve hygrothermal comfort for housing occupants.
Geoffrey Promis; Omar Douzane; Daniel Rousse; Thierry Langlet. An Innovative System for the Treatment of Rising Dampness in Buildings Located in Cold Climates. Energies 2021, 14, 3421 .
AMA StyleGeoffrey Promis, Omar Douzane, Daniel Rousse, Thierry Langlet. An Innovative System for the Treatment of Rising Dampness in Buildings Located in Cold Climates. Energies. 2021; 14 (12):3421.
Chicago/Turabian StyleGeoffrey Promis; Omar Douzane; Daniel Rousse; Thierry Langlet. 2021. "An Innovative System for the Treatment of Rising Dampness in Buildings Located in Cold Climates." Energies 14, no. 12: 3421.
The use of bio-based materials (BBM) in buildings is an interesting solution as they are eco-friendly materials and have low embodied energy. This article aims to investigate the hygric performance of two bio-based materials: palm and sunflower concretes. The moisture buffering value (MBV) characterizes the ability of a material or multilayer component to moderate the variation in the indoor relative humidity (RH). In the literature, the moisture buffer values of bio-based concretes were measured at a constant temperature of 23 °C. However, in reality, the indoor temperature of the buildings is variable. The originality of this article is found in studying the influence of the temperature on the moisture buffer performance of BBM. A study at wall scale on its impact on the indoor RH at room level will be carried out. First, the physical models are presented. Second, the numerical models are implemented in the Simulation Problem Analysis and Research Kernel (SPARK) suited to complex problems. Then, the numerical model validated with the experimental results found in the literature is used to investigate the moisture buffering capacity of BBM as a function of the temperature and its application in buildings. The results show that the temperature has a significant impact on the moisture buffering capacity of bio-based building materials and its capacity to dampen indoor RH variation. Using the numerical model presented in this paper can predict and optimize the hygric performance of BBM designed for building application.
Fathia Igue; Anh Tran Le; Alexandra Bourdot; Geoffrey Promis; Sy Nguyen; Omar Douzane; Laurent Lahoche; Thierry Langlet. Impact of Temperature on the Moisture Buffering Performance of Palm and Sunflower Concretes. Applied Sciences 2021, 11, 5420 .
AMA StyleFathia Igue, Anh Tran Le, Alexandra Bourdot, Geoffrey Promis, Sy Nguyen, Omar Douzane, Laurent Lahoche, Thierry Langlet. Impact of Temperature on the Moisture Buffering Performance of Palm and Sunflower Concretes. Applied Sciences. 2021; 11 (12):5420.
Chicago/Turabian StyleFathia Igue; Anh Tran Le; Alexandra Bourdot; Geoffrey Promis; Sy Nguyen; Omar Douzane; Laurent Lahoche; Thierry Langlet. 2021. "Impact of Temperature on the Moisture Buffering Performance of Palm and Sunflower Concretes." Applied Sciences 11, no. 12: 5420.