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Effect of silica aerogel on the thermal conductivity of cement paste for the construction of concrete buildings in sustainable cities

机译：二氧化硅气凝胶对可持续城市混凝土建筑中水泥浆导热性的影响

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The objective of this paper is to evaluate the effect of silica aerogel on the thermal conductivity of cement paste for the construction of concrete buildings in sustainable cities. Samples consisting of Ordinary Portland Cement (OPC), free water and different volumes of silica aerogel were prepared and cured for three (3), seven (7) and 28 days. Compressive strength tests were performed on samples at three (3), seven (7) and 28 days of curing. Porosity and thermal conductivity tests were conducted on samples at 28 days of curing. The lowest thermal conductivity measured was 0.076 W/mK, which was achieved by sample mix with 20 ml of silica aerogel (M20), which represents a 93.58% reduction in thermal conductivity relative to the control mix. The highest permeable porosity measured for cement paste incorporated with silica aerogel was 25.6%, which was also obtained by sample M20. However, the highest compressive strength measured was 54.33 MPa, which was obtained by sample mix with 10 ml of silica aerogel (M10) at 28 days of curing. The addition of silica aerogel as filler in cement paste can reduce the thermal conductivity of cement paste at the expense of reduced compressive strength and increased permeable porosity.
机译：本文的目的是评估二氧化硅气凝胶对可持续性城市混凝土建筑中水泥浆导热性的影响。制备了由普通波特兰水泥（OPC），游离水和不同体积的二氧化硅气凝胶组成的样品，并进行了三（3），七（7）和28天的固化。在固化三（3），七（7）和28天时对样品进行抗压强度测试。在固化28天时对样品进行了孔隙率和导热率测试。测得的最低导热系数为0.076 W / mK，这是通过与20 ml硅胶气凝胶（M20）进行样品混合而实现的，相对于对照混合物，导热系数降低了93.58％。对于掺有二氧化硅气凝胶的水泥浆，测得的最高渗透率孔隙率为25.6％，这也是通过样品M20获得的。但是，测得的最高抗压强度为54.33 MPa，这是通过在固化28天时与10 ml二氧化硅气凝胶（M10）进行样品混合而获得的。在水泥浆中添加二氧化硅气凝胶作为填料会降低水泥浆的导热性，但会降低抗压强度并增加可渗透孔隙率。

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