This paper deals with an experimental investigation into the mechanical performance and microstructure characteristics of the cementitious mortars containing recycled waste materials subjected to acidic, neutral and alkaline environments. The recycled waste materials include glass, eggshell, iron and rubber powder in various amounts, namely 7, 14 and 21% by volume, as the replacement for ordinary Portland cement (OPC). In this respect, to examine the mechanical performance of the specimens, the compressive, tensile and bending strength tests as well as water absorption test were carried out at the ages of 7, 28 and 90 days. Moreover, to study the microstructure of the specimens, the scanning electron microscopy (SEM) and x-ray diffraction (XRD) tests were conducted accordingly. For curing the specimens, three different environments with PH values of 2.5, 12.5 and 7 representing the acidic, alkaline and neutral environments, were taken into account. Promisingly, it was observed that inclusion of the recycled waste materials, significantly enhanced the mechanical properties of the mortar when exposed to the acidic curing conditions. Lastly, the results derived from the microstructure tests revealed that as a result of replacing cement with the glass, iron and eggshell powders, the width of cracks and volume of the pores decreased by three times and importantly, the bonding between the cement paste and additives was strengthened.

本文对含有再生废料的水泥砂浆在酸性、中性和碱性环境下的力学性能和微观结构特征进行了实验研究。. 回收的废料包括不同数量的玻璃、蛋壳、铁和橡胶粉，分别占体积的 7%、14% 和 21%，作为普通波特兰水泥 (OPC) 的替代品。在这方面，为了检查试样的机械性能，在 7、28 和 90 天时进行了压缩、拉伸和弯曲强度试验以及吸水试验。此外，为了研究样品的微观结构，相应地进行了扫描电子显微镜（SEM）和X射线衍射（XRD）测试。为了固化试样，考虑了 PH 值分别为 2.5、12.5 和 7 的三种不同环境，分别代表酸性、碱性和中性环境。有希望的是，观察到包含回收的废料，当暴露在酸性固化条件下时，砂浆的力学性能显着提高。最后，微观结构测试的结果表明，用玻璃粉、铁粉和蛋壳粉代替水泥后，裂缝宽度和孔隙体积减少了三倍，重要的是，水泥浆体和外加剂得到加强。