A Small-scale Thermogravimetric Method to Measure the Chemical Reactivity of Supplementary Cementitious Materials
A Small-scale Thermogravimetric Method to Measure the Chemical Reactivity of Supplementary Cementitious Materials
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DOI：
10.1016/j.cement.2023.100071
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
Sarah L. Williams;Danielle N. Beatty;W. Srubar
中科院分区：
文献类型：
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作者：
Sarah L. Williams;Danielle N. Beatty;W. Srubar
用辅助胶凝材料（SCM）部分替代普通波特兰水泥（OPC）是设计与普通OPC混凝土混合物相比具有更低体现碳和改善耐久性的混凝土混合物的普遍且有效的方法。然而，由于全球脱碳努力和混凝土行业的持续需求，普通工业SCM的全球供应，如粉煤灰（煤炭燃烧的副产品）和高炉矿渣（炼钢的副产品）正在减少。新标准化的ASTM C1897快速、相关和可靠（R3）测试是测量潜在SCM化学反应性的有效筛选方法。然而，样品数量的要求阻碍了快速筛选新的SCM来源，目前可能只有少量。本研究的目的是设计和验证一个小规模的修改R3测试，使标准化的表征和快速通过筛选新的SCM。结果证实，ASTM C1897 R3结合水方法可以在小得多的规模（即，0.01 g SCM/试验），使用本文开发和验证的热重法。
Partial replacement of ordinary portland cement (OPC) with supplementary cementitious materials (SCMs) is a ubiquitous and effective approach to design concrete mixtures with lower embodied carbon and improved durability compared to plain OPC concrete mixtures. However, the global supply of common industrial SCMs, like fly ash (a byproduct of coal combustion) and blast-furnace slag (a byproduct of steelmaking), is dwindling due to global decarbonization efforts and sustained demand from the concrete industry. The newly standardized ASTM C1897 rapid, relevant, and reliable (R3) test is an effective screening method to measure the chemical reactivity of potential SCMs. However, the sample quantity requirements impede the rapid-throughput screening of new SCM sources that may currently be available only in small quantities. The objective of the current study is to design and validate a small-scale modified R3 test to enable standardized characterization and rapid-throughput screening of novel SCMs. The results substantiate that the ASTM C1897 R3 bound water method can be performed with sufficient accuracy at a much smaller scale (i.e., 0.01 g of SCM per test) using the thermogravimetric method developed and validated herein.