Hydration Products and Mechanical Properties of Ferronickel Slag Blended Cement Mortar under Steam Curing

被引：0

作者：

Li B. ^{[1
]}

Wang S. ^{[1
]}

Pan D. ^{[1
]}

Zhang Y. ^{[1
]}

机构：

[1] Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 07期

关键词：

Cement; Ferronickel slag; Hydration product; Steam curing; Strength;

D O I：

10.14062/j.issn.0454-5648.2019.07.04

中图分类号：

学科分类号：

摘要：

20% of ferronickel slag (FNS) were used to replace Portland cement (PC) to prepare mortars. The hydration products and mechanical properties of steam cured mortars (80 ℃ for 7 h and 7 d) were compared with standard cured mortars (28 d). The results show that MgO in FNS exists in both mineral crystalline phase (i.e., forsterite and enstatite) and amorphous phases. The addition of FNS in cement changes the morphology and composition of hydration products. The hydration products of plain cement mortar under steam curing for 7 d are mainly fibrous C-S-H gels, flake CH and granular hydrogarnet. For FNS mortars, in addition to the above hydration products, hydrotalcite is also generated, indicating that steam curing promotes the reaction of MgO in FNS. After standard cured for 28 d, the morphology of C-S-H gels in plain cement mortars is mainly reticular, while that in FNS mortars is mainly fibrous and equant grains. Furthermore, the non-evaporable water of FNS mortar and plain cement mortar is basically the same under steam curing for 7 h, while the non-evaporable water of steam cured 7 d mortars is higher than that of standard cured 28 d mortars. Steam curing promotes the pozzolanic activity of FNS, leading to the significantly improved strength activity index of mortars. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：891 / 899

页数：8

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