Catalin Saitis, Daniela Manea Lucia, Moldovan Marioara, Monica Plesa Luminita, Borodi Gheorghe, Petean Ioan, Sorin Letiu
Faculty of Civil Engineering, Technical University of Cluj-Napoca, 28 Memorandumului, 400114 Cluj-Napoca, Romania.
Department of Polymer Composites, Raluca Ripan Institute for Research in Chemistry, Babeș-Bolyai University, 30 Fantanele Street, 400294 Cluj-Napoca, Romania.
Materials (Basel). 2024 Oct 21;17(20):5122. doi: 10.3390/ma17205122.
The current framework for managing construction waste, guided by European Union regulations, calls for an integrated waste management system. However, the reuse of old plaster waste, particularly from deteriorated facades, remains underexplored. This study investigates the potential of repurposing old plaster waste as a substitute for aggregates and cement in mortars, with the aim of promoting environmental sustainability and resource efficiency. Three mortar mixes were analyzed: a control mix, a mix with 45% waste replacing aggregates, and a mix with 10% waste replacing cement. Results show that replacing 45% of aggregates with plaster waste led to a 30% reduction in flexural strength, while the 10% cement replacement increased flexural strength by 6%. Compressive strength dropped by 27% and 38% for cement and aggregate replacements, respectively. Despite these reductions, the waste replacement remained within acceptable limits for structural integrity. Further microscopic analysis revealed that the incomplete integration of portlandite particles from the waste contributed to non-uniform bonding and crystal formation, weakening the mortar's structure. This research demonstrates the feasibility of reusing old plaster waste, offering a novel approach to reducing construction waste and promoting a circular economy. It contributes to filling the knowledge gap on the reuse of plaster mortars while aligning with sustainable construction goals.
目前由欧盟法规指导的建筑垃圾管理框架要求建立一个综合废物管理系统。然而，旧石膏废料的再利用，特别是来自受损外墙的废料，仍未得到充分探索。本研究调查了将旧石膏废料重新用作砂浆中骨料和水泥替代品的潜力，旨在促进环境可持续性和资源效率。分析了三种砂浆混合物：一种对照混合物、一种用45%废料替代骨料的混合物以及一种用10%废料替代水泥的混合物。结果表明，用石膏废料替代45%的骨料会导致抗弯强度降低30%，而用10%的废料替代水泥会使抗弯强度提高6%。水泥和骨料替代物的抗压强度分别下降了27%和38%。尽管有这些降低，但废料替代物仍在结构完整性的可接受范围内。进一步的微观分析表明，废料中波特兰石颗粒的不完全整合导致粘结不均匀和晶体形成，削弱了砂浆的结构。这项研究证明了再利用旧石膏废料的可行性，提供了一种减少建筑垃圾和促进循环经济的新方法。它有助于填补石膏砂浆再利用方面的知识空白，同时符合可持续建筑目标。
