ABSTRACT In this study, thermophysical properties of a commonly used silica sand were investigated and their relation to its granulometric and chemical composition was studied. Thermal expansion and differential scanning calorimetry tests were performed on individual fractions of the silica sand together with X-ray fluorescence measurements to determine their constituents. It was found that the various size fractions of silica sand exhibit different levels of thermal expansion based on the differences in SiO2 content. The expansion behaviour of two additional silica samples and a recycled olivine sand was also investigated in relation to its grain size to justify the findings.

中文翻译：

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不同粒度级硅砂热膨胀差异的成因

摘要 在这项研究中，研究了常用硅砂的热物理性质，并研究了它们与其粒度和化学成分的关系。对硅砂的各个部分进行了热膨胀和差示扫描量热测试，并结合 X 射线荧光测量来确定它们的成分。发现基于SiO2含量的差异，不同粒度级分的硅砂表现出不同水平的热膨胀。还研究了两个额外的二氧化硅样品和回收的橄榄石砂的膨胀行为与其粒度的关系，以证明这些发现是正确的。