Hegyi Andreea, Petcu Cristian, Ciobanu Adrian Alexandru, Calatan Gabriela, Bradu Aurelia
NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Florești, 400524 Cluj-Napoca, Romania.
Faculty of Materials and Environmental Engineering, Technical University of Cluj-Napoca, 103-105 Muncii Boulevard, 400641 Cluj-Napoca, Romania.
Materials (Basel). 2023 Jul 9;16(14):4903. doi: 10.3390/ma16144903.
This research investigates the feasibility of developing clay composites using natural materials and incorporating waste by-products suitable for plastering diverse support structures. The study identified a versatile composition suitable for a wide range of support materials and explored the potential of revaluing industrial waste and by-products by reintegrating them into the Circular Economy. The experimental investigation outlines the process of evaluating the influence of different raw materials on the performance of the clay composite. The findings confirm that using limestone sludge and fly ash as additives to clay contributes to reducing axial shrinkage and increasing mechanical strengths, respectively. The optimal percentage of additives for the clay used are identified and provided. Using hydraulic lime as a partial substitute for clay reduces the apparent density of dried clay composites, axial shrinkage, and fissures formation while improving adhesion to the substrate. Introducing dextrin into this mix increases the apparent density of the hardened plaster while keeping axial shrinkage below the maximum threshold indicated by the literature. Mechanical strengths improved, and better compatibility in terms of adhesion to the support was achieved, with composition S3 presenting the best results and a smooth, fissure-free plastered surface after drying.
本研究调查了使用天然材料开发粘土复合材料并掺入适合涂抹各种支撑结构的废弃副产品的可行性。该研究确定了一种适用于多种支撑材料的通用配方，并探讨了通过将工业废料和副产品重新纳入循环经济来重新评估其价值的潜力。实验研究概述了评估不同原材料对粘土复合材料性能影响的过程。研究结果证实，使用石灰石污泥和粉煤灰作为粘土添加剂分别有助于减少轴向收缩和提高机械强度。确定并提供了所用粘土添加剂的最佳百分比。使用水硬石灰作为粘土的部分替代品可降低干燥粘土复合材料的表观密度、轴向收缩和裂缝形成，同时提高与基材的附着力。将糊精引入该混合物中可提高硬化石膏的表观密度，同时使轴向收缩保持在文献所示的最大阈值以下。机械强度得到提高，在与支撑体的附着力方面实现了更好的兼容性，组合物S3表现出最佳结果，干燥后石膏表面光滑、无裂缝。
