不同温度下矿渣对铝酸盐水泥早期水化行为的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (4): 1343-1351.

不同温度下矿渣对铝酸盐水泥早期水化行为的影响

王思纯¹, 廖宜顺¹, 万世辉^1,2

1.武汉科技大学城市建设学院,武汉 430065;
2.中建商品混凝土有限公司,武汉 430074

收稿日期:2021-11-25 修回日期:2022-01-23 出版日期:2022-04-15 发布日期:2022-04-27
通讯作者: 廖宜顺,博士,副教授。E-mail:liaoyishun@wust.edu.cn
作者简介:王思纯(1996—),男,硕士研究生。主要从事高性能土木工程材料的研究。E-mail:756326499@qq.com
基金资助:
长江科学院开放研究基金(CKWV2019756/KY);国家自然科学基金(51608402);中建股份青年科研课题(CSCEC-2021-Q-61)

Effect of GGBFS on Early Hydration Behavior of Calcium Aluminate Cement at Different Temperatures

WANG Sichun¹, LIAO Yishun¹, WAN Shihui^1,2

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. China Construction Ready Mixed Concrete Co., Ltd., Wuhan 430074, China

Received:2021-11-25 Revised:2022-01-23 Online:2022-04-15 Published:2022-04-27

摘要/Abstract

摘要： 通过凝结时间、抗压强度、电阻率、浆体内部温度测试和水化产物分析,研究了20 ℃、35 ℃和50 ℃下矿渣(GGBFS)对铝酸盐水泥(CAC)早期水化行为的影响。结果表明,掺入矿渣会逐渐减小CAC 72 h的化学收缩,降低化学收缩速率峰值。20 ℃时,电阻率变化曲线出现了明显的晶相转变期,化学收缩曲线存在明显的诱导期; 35 ℃时,凝结时间延长,掺入矿渣抑制了电阻率的发展;50 ℃时,电阻率在接近24 h时显著降低,凝结时间显著缩短,掺入矿渣缓解了24 h电阻率的减小。矿渣-铝酸盐水泥体系的水化产物和抗压强度受养护温度的影响较大。20 ℃时,掺入40%(质量分数)矿渣减少了CAH₁₀的生成量,降低了硬化浆体的强度;35 ℃和50 ℃时,1 d水化产物主要为C₂AH₈和少量C₃AH₆,掺入矿渣延缓了强度的倒缩。在28 d龄期时,不同养护温度下掺入矿渣均能促进C₂ASH₈的生成。

关键词: 铝酸盐水泥, 矿渣, 凝结时间, 抗压强度, 电阻率, 水化产物

Abstract: The influence of ground granulated blast furnace slag (GGBFS) on the early hydration of calcium aluminate cement (CAC) at 20 ℃, 35 ℃ and 50 ℃ were investigated in this study. The test on setting time, compressive strength, electrical resistivity, internal temperature of cement pastes and hydration products were employed. The results indicate that the addition of GGBFS reduces chemical shrinkage at 72 h and decreases the peak value of the rate of chemical shrinkage. The electrical resistivity curves and the chemical shrinkage curves show an obvious phase transformation stage and induction stage respectively at 20 ℃. At 35 ℃, the setting time of cement pastes is prolonged, the development of electrical resistivity is inhibited after the addition of GGBFS. At 50 ℃, the electrical resistivity decreases significantly near 24 h and the setting time of cement pastes are shortened obviously. However, the reduction of electrical resistivity at 24 h is undermined with GGBFS. Besides, the hydration products and compressive strength of CAC and GGBFS composites are affected significantly by the curing temperature. At 20 ℃, the incorporation of 40% (mass fraction) GGBFS reduces the amount of CAH₁₀, decreases the compressive strength of cement pastes. At 35 ℃ and 50 ℃, the hydration products at 1 d are major C₂AH₈ and minor C₃AH₆, the reduction of compressive strength are weakened with GGBFS. At 28 d, the addition of GGBFS can promote the formation of C₂ASH₈ at different curing temperatures.

Key words: calcium aluminate cement, ground granulated blast furnace slag, setting time, compressive strength, electrical resistivity, hydration product

中图分类号:

TQ172

王思纯, 廖宜顺, 万世辉. 不同温度下矿渣对铝酸盐水泥早期水化行为的影响[J]. 硅酸盐通报, 2022, 41(4): 1343-1351.

WANG Sichun, LIAO Yishun, WAN Shihui. Effect of GGBFS on Early Hydration Behavior of Calcium Aluminate Cement at Different Temperatures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1343-1351.

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