Akgül Melek
Department of Civil Engineering, Munzur University, Tunceli, Turkey.
Heliyon. 2024 Aug 17;10(16):e36423. doi: 10.1016/j.heliyon.2024.e36423. eCollection 2024 Aug 30.
Concrete and mortar wastes, which have a large volume and economic value among construction demolition wastes, are the most targeted demolition waste group to be recycled. An important area where construction demolition waste can be utilized is self-compacting mortar (SCM) systems. SCMs are innovative and economical systems designed to minimize the labor requirements that are difficult to meet in the production process. In this study, mortar waste aggregate (MWA) obtained by mechanical crushing and grinding was used in SCM elements by substituting different ratios (5-10-20-30-40 %) by mass to aggregate. In this way, it was aimed to evaluate both the sustainability of MWAs and the usability of MWAs in SCMs, which are considered as a new production technology. The fresh and hardened mortar tests performed in the study are presented comparatively. The physical (dry unit volume weight, porosity), durability (capillary water absorption) and mechanical properties (flexural tensile, compressive strength) of the hardened SCM elements are based on the determinations made at 3, 7 and 28 test days and according to different curing conditions (water curing, air curing and heat curing). In addition, X-ray Diffractometer (XRD) analysis was performed on specimens obtained from 0 %, 10 %, 20 % and 40 % MWA substituted specimens after heat curing (after 7 days water curing) and 28 days water curing. In the light of the data obtained, it is reported that SCM production with 10 % MWA substitution is feasible in terms of sustainability and engineering properties evaluated in this study.
混凝土和砂浆废料在建筑拆除废物中体积大且具有经济价值，是最适合回收利用的拆除废物类别。建筑拆除废物的一个重要利用领域是自密实砂浆（SCM）系统。SCM是一种创新且经济的系统，旨在尽量减少生产过程中难以满足的劳动力需求。在本研究中，通过机械破碎和研磨获得的砂浆废料集料（MWA）被用于SCM构件中，以质量比替代集料的不同比例（5%-10%-20%-30%-40%）。通过这种方式，旨在评估MWA的可持续性以及其在被视为一种新生产技术的SCM中的可用性。本研究中进行的新拌砂浆和硬化砂浆试验进行了比较介绍。硬化SCM构件的物理性能（干单位体积重量、孔隙率）、耐久性（毛细吸水）和力学性能（弯曲抗拉强度、抗压强度）基于在3天、7天和28天试验龄期以及根据不同养护条件（水养护、空气养护和热养护）所做的测定。此外，对热养护（水养护7天后）和28天水养护后从0%、10%、20%和40%MWA替代试件中获取的试样进行了X射线衍射仪（XRD）分析。根据获得的数据，据报道，用10%MWA替代生产SCM在本研究评估的可持续性和工程性能方面是可行的。
