The partial substitution of ordinary Portland Cement (OPC) with clay minerals as supplementary cementitious materials has been currently considered as an effective approach for reducing the harmful environmental impact and health risks of OPC. Although cement mortars are not easily ignitable, the exposure to elevated temperatures can alter their microstructure, leading to reduction in the strength and damage. Therefore, improving the temperature resistance of the cement mortars through the incorporation of local clay minerals has been proposed in this study. The mechanical performance and physical properties of cement mortars containing Wasia Formation clay (WFC) exposed to 700 °C have been investigated. OPC was partially replaced with WFC at various mass ratios of 0, 5, 10, 15, and 20 wt%. Several methods were used to assess the physico-mechanical and structural properties such as compressive strength testing, ultrasonic pulse velocity (UPV), Schmidt hamme, scanning electron microscopy, and X-ray powder diffraction (XRD). The addition of WFC as partial replacement of the cement showed a significant enhancement in the compressive strength for the mortars exposed to normal and elevated temperatures. The compressive strength of the mortar incorporating 20 wt% of WFC and exposed to 700 °C is about 2.5-fold greater than that of the ordinary mortar. Even after exposure to 700 °C, the UPV for the 20 wt% WFC-blended mortar is 30% greater than that for ordinary mortar, indicating the improved structural integrity of the blended mortars. The WFC-blended mortars showed dense and compact microstructure confirming the improvement in the strength of mortars.

目前，以粘土矿物作为辅助胶结材料部分替代普通波特兰水泥（OPC）被认为是减少OPC的有害环境影响和健康风险的有效方法。尽管水泥砂浆不易着火，但暴露于高温下会改变其微观结构，从而导致强度降低和损坏。因此，本研究提出了通过掺入局部粘土矿物来提高水泥砂浆的耐温性的方法。研究了暴露于700°C的含有Wasia形成粘土（WFC）的水泥砂浆的机械性能和物理性能。OPC被WFC分别以0、5、10、15和20 wt％的质量比部分取代。几种方法用于评估物理机械和结构特性，例如抗压强度测试，超声脉冲速度（UPV），施密特hamme，扫描电子显微镜和X射线粉末衍射（XRD）。加入WFC作为水泥的部分替代品，可显着提高暴露于常温和高温下的砂浆的抗压强度。掺有20％（重量）WFC并暴露于700°C的砂浆的抗压强度比普通砂浆高约2.5倍。即使在暴露于700°C后，掺入WFC的砂浆的20％（重量）UPV也比普通砂浆的UPV高30％，这表明掺混砂浆的结构完整性得到了改善。