Study on the heat-moisture transfer in concrete under real environment

Hygrothermal simulations and In-situ measurements of ultra-lightweight concrete panels

“…This shows that the air humidity has a high influence at near-surface points. Chikhi et al found the same phenomenon in case of polystyrene concretes [28], and it was demonstrated for concrete [10], [29] as well as for External Thermal Insulation Composite System (ETICS) [30].…”

“…Therefore, in this research conjugated heat and moisture transport simulations were conducted based on Künzel and Kiessl's approach [9]. These analyzes can predict the temperature and humidity changes within the material, and provide information about the possible deterioration of the material [10]. These calculations are based on material properties and boundary conditions; however, the material properties are continuously changing over time, depending on the temperature and moisture conditions.…”

Prediction of Temperature Distribution in Concrete under Variable Environmental Factors through a Three-Dimensional Heat Transfer Model

“…Schindler et al [23] adopted a high performance concrete paving (HIPERPAV) model and transient one-dimensional finite difference model to explore the temperature response of Portland cement concrete pavement under the coupled actions of external environment factors and internal heat produced by cement hydration. Cho et al [24] established an internal temperature and relative humidity (RH) prediction model to describe the evolution of internal temperature and relative humidity in concrete under the coupled actions of radiation, convection, and ambient temperature, based on the basic principle of one-dimensional unsteady heat conduction. Likewise, Benkhaled et.…”

“…First, this study applied the COMSOL finite element calculation by considering the fluctuating ambient temperature, convection, and radiation. Then, a comparison be-tween the calculation results and the real-measured data derived from the literature [24] was made to verify the model. Consequently, a multi-factor coupling prediction model of internal temperature distribution in concrete was established and was proven to be reliable, and could provide a relatively accurate prediction of the temperature field under a natural environment.…”

Influencia del porcentaje de sustitución de emulsión asfáltica en frio en las propiedades físicas de cilindros de mortero y cilindros de tierra comprimida (CTC)

“…Pero ninguna de las alternativas anteriormente mencionadas han logrado desarrollar un mampuesto que presente total hidrorepelencia (Adam and Agib, 2001;Cañola and Echavarría 2017;Cañola et al, 2018;Pereira et al, 2018). Algunas investigaciones en las cuales se ha estudiado la problemática de humedad, sus efectos y la hidrorepelencia en muros se muestran a continuación: Cho et al (Cho et al, 2017) determinaron que el exceso de humedad en los concretos afecta las propiedades físicas del mismo como el módulo de elasticidad, contracción por secado, deformación y propiedades mecánicas como la resistencia a la compresión; además, determinaron que para predecir cuantitativamente el deterioro del concreto, es necesario identificar las condiciones ambientales en las cuales se encuentra expuesto el material y establecer el movimiento del aire y la velocidad de reacción del concreto con relación a la transferencia de calor y humedad. Así mismo, Muhammad et al (Muhammad et al, 2015) establecieron que someter elementos constructivos de concreto a la penetración continua de agua y otros fluidos genera una reducción con relación a la durabilidad.…”