Rivers are over exploited for natural sand extraction and production of cement has triggered global warming. For sustainable development a study has been conducted to use construction and demolition waste (CD-W) in cement-sand mortar. In the present study, crushed CD-W in the form of recycled concrete fine aggregate (RCFA) and recycled concrete powder (RCP) has been planned to be used in cement-sand mortar as replacement of natural standard sand (NSS) and cement, respectively. The effects of partial replacement of NSS and cement with RCFA and RCP on compressive strength and split tensile strength after 7^th and 28^th day of curing have been evaluated. Outcomes of elevating replacements of cement and sand in mortar have been found to be decreasing gradually, but falls above the minimum limit of 7.5 N/mm² as established by IS: 2250 (1981) for use of mortar in structural applications. Therefore, the study concludes the valid potential of RCFA to be utilized up to 100% percent and RCP up to 20% as partial replacement of natural sand and cement, respectively in mortar production.

中文翻译：

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可持续的砂浆混合物，使用从建筑和拆除废物中获得的回收粉

河流被过度开采用于天然采砂，水泥生产引发了全球变暖。为了实现可持续发展，已经进行了一项研究，以在水泥砂浆中使用建筑和拆除废物（CD-W）。在本研究中，已计划将再生混凝土细骨料（RCFA）和再生混凝土粉末（RCP）形式的压碎CD-W用于水泥砂浆中，以代替天然标准砂（NSS）和水泥，分别。部分替代的NSS和水泥用RCFA和RCP抗压强度和分裂抗拉强度的后7的影响^第28^届已经评估了固化的天数。已经发现，用砂浆替代水泥和沙子的结果逐渐减少，但下降到IS：2250（1981）确定的用于结构应用中砂浆的最低极限7.5 N / mm ²。因此，研究得出结论，在砂浆生产中，RCFA的有效潜力可分别利用高达100％的百分比和RCP高达20％的分数来替代天然沙子和水泥。