粉煤灰渣替代细骨料对砂浆混凝土强度及抗冻性影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 433-440.

粉煤灰渣替代细骨料对砂浆混凝土强度及抗冻性影响

张卉¹, 潘慧敏¹, 石雨轩¹, 周美茹², 王冬丽¹

1.燕山大学,河北省土木工程绿色建造与智能运维重点实验室,秦皇岛 066004;
2.河北建材职业技术学院,河北省绿色高性能建材应用技术协同创新中心,秦皇岛 066004

收稿日期:2021-10-16 修回日期:2021-12-07 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 周美茹,教授。E-mail:1069080830@qq.com
作者简介:张卉(1995—),男,硕士研究生。主要从事土木工程材料与固体废弃物应用技术方面的研究。E-mail:649431895@qq.com
基金资助:
河北省省级科技计划(19274103D);河北省自然科学基金(E2021107004)

Influence of Fly Ash Slag Substitution of Fine Aggregate on Strength and Frost Resistance of Mortar Concrete

ZHANG Hui¹, PAN Huimin¹, SHI Yuxuan¹, ZHOU Meiru², WANG Dongli¹

1. Key Laboratory of Green Construction and Intelligent Operation of Civil Engineering of Hebei Province, Yanshan University, Qinhuangdao 066004, China;
2. Hebei Green High-Performance Building Material Application Technology Collaborative Innovation Center, Hebei Construction Materials Vocational and Technical College, Qinhuangdao 066004, China

Received:2021-10-16 Revised:2021-12-07 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 通过筛分和破碎两种方式分别获得粒径区间为0.6~1.18 mm、0.3~0.6 mm的粉煤灰渣,并用其等体积替代对应粒径区间的细骨料,分析粉煤灰渣对砂浆工作性和强度的影响,探究粉煤灰渣的最优替代粒径区间。结合扫描电镜(SEM)、能谱分析(EDS)等方法分析了粉煤灰渣替代细骨料后砂浆试件的强度变化机理。基于砂浆最优替代粒径区间结果,验证了砂浆混凝土试件的强度和抗冻性。研究结果表明:分别以筛分方式和破碎方式得到的0.3~0.6 mm粒径区间粉煤灰渣替代对应区间细骨料后,其砂浆试件强度均与基准组(未替代)基本一致;而以筛分方式得到的0.3~0.6 mm粒径区间粉煤灰渣替代对应区间细骨料后,其混凝土试件强度和抗冻性与基准组基本一致。在水泥提供的氢氧化钙环境下粉煤灰渣表面生成水化硅酸钙,从而增加了水泥和粉煤灰渣界面胶结强度,强化水泥与粉煤灰渣界面区域,凹凸不平的粉煤灰渣表面与水泥浆咬合嵌锁,保证了试件的强度。

关键词: 粉煤灰渣, 粒径区间, 砂浆, 混凝土, 强度, 抗冻性, 微观形貌

Abstract: Through sieving and crushing, fly ash slag with the particle size range of 0.6 mm to 1.18 mm and 0.3 mm to 0.6 mmwere obtained, respectively, and fine aggregate in the corresponding particle size range was replaced by the same volume of fly ash slag. The influence of fly ash slag on the workability and strength of mortar was analyzed, and the optimal alternative particle size range of fly ash slag was explored. Combined with scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and other methods, the strength change mechanism of mortar specimens after the replacement of fine aggregate by fly ash slag was analyzed. Based on the results of the optimal replacement particle size range of the mortar, the strength and frost resistance of the mortar concrete specimens were verified. The results show that: after sieving and crushing to obtain fly ash slag in the particle size range of 0.3 mm to 0.6 mm to replace the fine aggregate in this interval, the strength of the mortar specimens is the same as that of the benchmark group; sieving to obtain the fly ash slag in the particle size range of 0.3 mm to 0.6 mm to replace this interval, the strength and frost resistance of the concrete specimens are the same as those of the benchmark group. Under the calcium hydroxide environment provided by cement, calcium silicate hydrate is formed on the surface of fly ash slag, thereby increasing the cement and fly ash slag interface bonding strength, strengthening the interface area between the cement and the fly ash slag. The uneven surface is interlocked with the cement slurry to ensure the strength of the specimen.

Key words: fly ash slag, particle size range, mortar, concrete, strength, frost resistance, microstructure

中图分类号:

TU521

张卉, 潘慧敏, 石雨轩, 周美茹, 王冬丽. 粉煤灰渣替代细骨料对砂浆混凝土强度及抗冻性影响[J]. 硅酸盐通报, 2022, 41(2): 433-440.

ZHANG Hui, PAN Huimin, SHI Yuxuan, ZHOU Meiru, WANG Dongli. Influence of Fly Ash Slag Substitution of Fine Aggregate on Strength and Frost Resistance of Mortar Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 433-440.

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