Wu Hao, Jia Yanmin, Yuan Zhu, Li Zhijia, Sun Tao, Zhang Jiahao
School of Civil Engineering, Northeast Forestry University, Harbin 150040, China.
Materials (Basel). 2022 Jun 2;15(11):3964. doi: 10.3390/ma15113964.
The use of a high volume of industrial solid waste mineral admixture and hybrid fiber can greatly reduce the amount of cement in mortar or concrete, improve its performance, ensure the service properties of mortar or concrete, and reuse industrial solid waste to reduce the environmental burden, which has significant research significance. In this paper, the mechanical properties, wear resistance and microstructure of hybrid fiber-reinforced mortar (HFRM) with a high content of industrial solid waste mineral admixture were systematically studied under different water/binder ratios. Mineral admixtures include fly ash, silica fume and granulated blast furnace slag (slag). The total content of hybrid glass fiber (GF) and polypropylene fiber (PPF) was 2% by volume fractions, and six different water/binder ratios ranging from 0.27 to 0.62 were used. The following conclusions were drawn: fibers have a significant negative effect on the properties of mortars with a low water/binder ratio (w/b = 0.27) and high content of mineral admixtures. In general, the effect of adding hybrid fiber on improving the wear resistance of mortar is more obvious. The average residual weight of hybrid fiber-reinforced mortar is the highest after the wear resistance test. Comprehensively considering the compressive strength, flexural strength, wear resistance and microstructure of the mortar samples, G8PP2-0.40 is the optimal mix ratio. At this time, the replacement rates of fly ash, silica fume and slag are: 20%, 5% and 30%, the water/binder ratio is 0.40, and the content of GF and PPF is 1.6% and 0.4%, respectively.
大量使用工业固体废弃物矿物掺合料和混杂纤维，可大幅减少砂浆或混凝土中水泥的用量，改善其性能，确保砂浆或混凝土的使用性能，并实现工业固体废弃物的再利用，减轻环境负担，具有重要的研究意义。本文系统研究了不同水胶比下高掺量工业固体废弃物矿物掺合料混杂纤维增强砂浆（HFRM）的力学性能、耐磨性和微观结构。矿物掺合料包括粉煤灰、硅灰和粒化高炉矿渣（矿渣）。混杂玻璃纤维（GF）和聚丙烯纤维（PPF）的总体积分数为2%，采用了0.27至0.62的六种不同水胶比。得出以下结论：纤维对水胶比低（w/b = 0.27）且矿物掺合料含量高的砂浆性能有显著负面影响。总体而言，添加混杂纤维对提高砂浆耐磨性的效果更明显。混杂纤维增强砂浆在耐磨性试验后的平均剩余重量最高。综合考虑砂浆试样的抗压强度、抗折强度、耐磨性和微观结构，G8PP2 - 0.40为最佳配合比。此时，粉煤灰、硅灰和矿渣的取代率分别为：20%、5%和30%，水胶比为0.40，GF和PPF的含量分别为1.6%和0.4%。
