花岗岩废石粉对砂浆强度及耐久性能的影响

摘要/Abstract

摘要： 针对花岗岩废石粉(granite waste powder, GWP)产量大和环境污染严重等问题,本文研究了不同球磨时间(0、10、20和30 min)下GWP的活性以及等质量取代率(0%、10%、20%和30%)对GWP砂浆宏观和微观性能的影响。结果表明:球磨30 min的GWP活性较高,达到72.98%;随着GWP取代率从10%增加至30%,砂浆的抗折强度、抗压强度和动弹模量分别下降6.31%~23.94%、3.02%~26.11%、5.35%~24.29%,砂浆的碳化深度与氯离子渗透系数分别增加20.43%~81.40%、2.31%~20.61%;GWP的加入使砂浆微观结构劣化,裂缝与孔洞增加,有害孔增加;基于建立的GWP取代率与砂浆强度及耐久性能之间的关系,GWP的最佳取代率为12.37%~21.74%,在此范围内,GWP砂浆的性能虽有一定程度的下降,但仍能保持与基准组接近的水平。对比不同取代率的GWP砂浆的能耗与经济成本,制备单位体积的砂浆每多使用10%的GWP可降低能耗107.08 MJ、经济成本46.01元。

关键词: 花岗岩废石粉, 活性, 取代率, 强度, 耐久性能, 微观结构

Abstract: In view of the problems of large output and serious environmental pollution of granite waste powder (GWP), the activity of GWP at different ball milling times (0, 10, 20 and 30 min) and the effect of equal mass substitution (0%, 10%, 20% and 30%) on the macro and micro properties of GWP mortar were investigated. The experimental results show that the GWP activity after ball milling for 30 min is high, reaching 72.98%. As the GWP replacement rate increases from 10% to 30%, the flexural strength, compressive strength and dynamic elastic modulus of the mortar decrease by 6.31%~23.94%, 3.02%~26.11% and 5.35%~24.29%, respectively. The carbonization depth and chloride ion permeability coefficient of the mortar increase by 20.43%~81.40% and 2.31%~20.61%, respectively. The addition of GWP makes the mortar microstructure deteriorate, cracks and holes increase, and harmful holes increase. Based on the established relationship between the GWP replacement rate and the strength, durability of the mortar, the optimal replacement rate of GWP is from 12.37% to 21.74%, in which the performance of GWP mortar is still close to that of the benchmark group although there is a certain degree of decrease. Comparing the energy consumption and economic cost of GWP mortar with different substitution rates, each additional 10% of GWP used to prepare unit volume of mortar can reduce energy consumption by 107.08 MJ and economic cost by 46.01 yuan.

Key words: granite waste powder, activity, replacement rate, strength, durability, microstructure

中图分类号:

TQ172

申屠存, 郑广远, 谭幸淼, 周明素, 胡赛群, 梁超锋. 花岗岩废石粉对砂浆强度及耐久性能的影响[J]. 硅酸盐通报, 2024, 43(11): 4150-4158.

SHENTU Cun, ZHENG Guangyuan, TAN Xingmiao, ZHOU Mingsu, HU Saiqun, LIANG Chaofeng. Effect of Granite Waste Powder on Strength and Durability of Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4150-4158.

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