Abstract
This study aims to provide a thermophysical characterization of a new economical and green mortar. This material is characterized by partially replacing the cement with recycled soda lime glass. The cement was partially substituted (10, 20, 30, 40, 50 and 60% in weight) by glass powder with a water/cement ratio of 0.4. The glass powder and four of the seven samples were analyzed using a scanning electron microscope (SEM). The thermophysical properties, such as thermal conductivity and volumetric specific heat, were experimentally measured in both dry and wet (water saturated) states. These properties were determined as a function of the glass powder percentage by using a CT-Meter at different temperatures (20 °C, 30 °C, 40 °C and 50 °C) in a temperature-controlled box. The results show that the thermophysical parameters decreased linearly when 60% glass powder was added to cement mortar: 37% for thermal conductivity, 18% for volumetric specific heat and 22% for thermal diffusivity. The density of the mortar also decreased by about 11% in dry state and 5% in wet state. The use of waste glass powder as a cement replacement affects the thermophysical properties of cement mortar due to its porosity as compared with the control mortar. The results indicate that thermal conductivity and volumetric specific heat increases with temperature increase and/or the substitution rate decrease. Therefore, the addition of waste glass powder can significantly affect the thermophysical properties of ordinary cement mortar.
Highlights
In order to determine the atomic composition of the samples used in this study, the scanning electron microscope was combined with an energy dispersive spectrometer, which allows a microanalysis of the used samples in different states: powder or solid
In the saturated state, this thermal diffusivity decreases from 0.69 to 0.64, which corresponds to an average of 7.24%. This new result is in full agreement with the previous results, in which we have shown a decrease in both thermal conductivity and density as a function of the glass powder content, which is associated with a small decrease in specific heat
The aim of this study is to evaluate the influence of soda-lime glass waste, as a cement substitute, on the thermophysical properties of cement mortar
Summary
The building construction industry is currently experiencing remarkable growth in the manufacturing of building materials. Concrete is produced with different compositions of ingredients based on the strength and performance requirements of the structure. The most commonly-used concrete is Normal Strength Concrete (NSC). The primary components of concrete are the binder or cement, fine aggregates, coarse aggregates, and water. In order to attain high strength or high performance standards, certain secondary components such as fly ash, ground granulated blast furnace slag (slag), silica fume, and superplasticizers are added to the design mix [1]
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