The paper reports the use of low-grade calcined clay (LCC), a waste clay from construction and excavation works, to produce low-carbon and lightweight strain-hardening cement composites (SHCC). The influence of LCC content (20, 40 and 60% by mass) on the hydration, microstructure, strength, ductility, shrinkage and embodied carbon of SHCC has been investigated. Pozzolanic reaction between LCC and cement hydration products has been observed, which results in significant pore refinement at 20% and 40% cement replacement. The density of SHCC containing LCC was only around 1600 kg/m³. The compressive strength, tensile strain, and tensile strength of SHCC mixtures containing 20% LCC were improved by 3.21%, 22.10%, and 32.28%, respectively. A continued increase in LCC substitution caused a decrease in the strength by the agglomeration of LCC and insufficient calcium hydroxide supply. Furthermore, a significant reduction in embodied carbon was achieved by replacing cement with LCC. Overall, this study shows that low-grade calcined clay has a high potential in producing low-carbon and lightweight SHCC.

该论文报告了使用低品位煅烧粘土 (LCC) 来生产低碳轻质应变硬化水泥复合材料 (SHCC)，这是一种来自建筑和挖掘工程的废粘土。研究了 LCC 含量（按质量计 20、40 和 60%）对SHCC 的水合、微观结构、强度、延展性、收缩和隐含碳的影响。已经观察到LCC 和水泥水化产物之间的火山灰反应含有 LCC 的 SHCC 的密度仅为 1600 kg/m ³。抗压强度、拉伸应变和含 20% LCC 的 SHCC 混合物的抗拉强度分别提高了 3.21%、22.10% 和 32.28%。LCC替代的持续增加导致LCC的团聚和氢氧化钙供应不足导致强度下降。此外，通过用 LCC 代替水泥，显着减少了隐含碳。总体而言，本研究表明，低品位煅烧粘土在生产低碳轻质 SHCC 方面具有很大潜力。