Sulfate resistance of steel slag blended/GGBFS blended cement mortars under different curing conditions

被引：1
|
作者：
Li B. [1 ,2 ]
Huo B. [1 ,2 ]
You N. [1 ,2 ]
Zhu G. [1 ,2 ]
Chen C. [1 ,2 ]
Zhang Y. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Southeast University, Nanjing
[2] Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2019年 / 49卷 / 06期
关键词：
Dry-wet cycles; GGBFS blended cement mortar; Partial immersion; Steam curing; Steel slag blended cement mortar; Sulfate resistance;
D O I：
10.3969/j.issn.1001-0505.2019.06.018
中图分类号：
学科分类号：
摘要：
Steel slag (SS) and ground granulated blast furnace slag(GGBFS) blended cement mortars were prepared under two replacement levels (0% and 20%) and two curing regimes (initial steam curing at 80 ℃ for 7 h and initial standard curing). After 28 d standard curing, they were exposed to two kinds of sulfate attack conditions: dry-wet cycles and partial immersion. The sulfate resistances were compared by appearance quality check, mass change and strength change. The results show that, no matter what initial curing condition is applied, SS cement mortar shows better performance than the GGBFS cement mortar under dry-wet cycles and sulfate attack. The performance of standard cured SS cement mortar is worse than that of standard cured GGBFS cement mortar under partial immersion sulfate attack, but the situation of steam cured SS cement mortar is just the opposite. The initial steam curing coarsens the pore structure of the cement mortar so that cracks appear earlier in the steam cured mortar than that in the standard cured one under the partial immersion, but the initial steam curing also improves the non-evaporable water content and C-S-H gels content in the cement mortar hydrated for 28 d, and promotes the C-A-S-H formation, thus, helping to improve the sulfate resistance of steam cured mortars. © 2019, Editorial Department of Journal of Southeast University. All right reserved.
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页码：1144 / 1152
页数：8
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