Lu Shijian, Cheng Jiajia, Zhu Zhipeng, Yan Luchao, Wang Yang, Xu Lingling, Deng Min
College of Material Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2024 Jul 10;17(14):3416. doi: 10.3390/ma17143416.
In this paper, the effect of waste rock-wool dosage on the workability, mechanical strength, abrasion resistance, toughness and hydration products of PVA and steel fiber-reinforced mortars was investigated. The results showed that the fluidity of the mortar gradually decreased with the increase in the dosage of waste rock wool, with a maximum reduction of 10% at a dosage of 20%. The higher the dosage of waste rock wool, the greater the reduction in compressive strength. The effect of waste rock wool on strength reduction decreases with increasing age. When the dosage of waste rock wool was 10%, the 28 days of flexural and compressive strengths were reduced by 4.73% and 10.59%, respectively. As the dosage of waste rock wool increased, the flexural-to-compressive ratio increased, and at 20%, the maximum value of 28 days of flexural-to-compressive ratio was 0.210, which was increased by 28.05%. At a 5% dosage, the abraded volume was reduced from 500 mm to 376 mm-a reduction of 24.8%. Waste rock wool only affects the hydration process and does not cause a change in the type of hydration products. It promotes the hydration of the cementitious material system at low dosages and exhibits an inhibitory effect at high dosages.
本文研究了废岩棉掺量对聚乙烯醇（PVA）和钢纤维增强砂浆的工作性、力学强度、耐磨性、韧性及水化产物的影响。结果表明，随着废岩棉掺量的增加，砂浆的流动性逐渐降低，当掺量为20%时，流动性最大降低了10%。废岩棉掺量越高，抗压强度降低越大。废岩棉对强度降低的影响随龄期增长而减小。当废岩棉掺量为10%时，28天抗折强度和抗压强度分别降低了4.73%和10.59%。随着废岩棉掺量的增加，折压比增大，当掺量为20%时，28天折压比的最大值为0.210，提高了28.05%。在5%的掺量下，磨损体积从500mm减小到376mm，减小了24.8%。废岩棉仅影响水化过程，不会导致水化产物类型发生变化。在低掺量下，它促进胶凝材料体系的水化，而在高掺量下则表现出抑制作用。
