Zhang Dongsheng, Zhang Shuxiang, Yang Qiuning
School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China.
Research Group RecyCon, Department of Civil Engineering, KU Leuven, Campus Bruges, 8200 Bruges, Belgium.
Materials (Basel). 2023 Jun 9;16(12):4292. doi: 10.3390/ma16124292.
Natural river sand resources are facing depletion, and large-scale mining pollutes the environment and harms humans. To utilize fly ash fully, this study used low-grade fly ash as a substitute for natural river sand in mortar. This has great potential to alleviate the shortage of natural river sand resources, reduce pollution, and improve the utilization of solid waste resources. Six types of green mortars were prepared by replacing different amounts of river sand (0, 20, 40, 60, 80, and 100%) with fly ash and other volumes. Their compressive strength, flexural strength, ultrasonic wave velocity, drying shrinkage, and high-temperature resistance were also investigated. Research has shown that fly ash can be used as a fine aggregate in the preparation of building mortar, thereby ensuring that green-building mortar has sufficient mechanical properties and better durability. The replacement rate for optimal strength and high-temperature performance was determined to be 80%.
天然河砂资源面临枯竭，大规模开采会污染环境并危害人类。为了充分利用粉煤灰，本研究使用低等级粉煤灰替代砂浆中的天然河砂。这在缓解天然河砂资源短缺、减少污染以及提高固体废弃物资源利用率方面具有巨大潜力。通过用粉煤灰替代不同量的河砂（0%、20%、40%、60%、80%和100%）及其他体积量，制备了六种绿色砂浆。还研究了它们的抗压强度、抗折强度、超声波速度、干燥收缩和耐高温性能。研究表明，粉煤灰可作为细集料用于制备建筑砂浆，从而确保绿色建筑砂浆具有足够的力学性能和更好的耐久性。确定最佳强度和高温性能的替代率为80%。
