Pozzolanic Reactivity and Hydration Properties Assessment of Tuff Powder in Composite Cementitious Materials
WANG Xuhao1,*, HOU Xin1, GAN Long1,2, WANG Yuan1, BIAN Qinghua3, ZHANG Jiupeng1
1 School of Highway, Chang'an University, Xi'an 710064, China 2 PowderChina Chengdu Engineering Corporation Limited, Chengdu 610072, China 3 Gansu Road and Bridge Third Highway Engineering Corporation Limited, Lanzhou 730050, China
Abstract: To respond to the “carbon peak, carbon neutral” strategy and realize the green and sustainable development of the cement industry, it is proposed to study the mechanism of the hydration effect on cement-based materials when tuff powder is used as supplementary cementitious material to replace part of cement. Through the research, we hope to promote the application of tuff powder in a practical project. In this work,a comparative study was carried out using granite powder, fly ash and tuff powder. The pozzolanic reactivity was evaluated by the pozzolanic reactivity index method, and then the strength and hydration development of cement-powder and cement-fly ash composite system were studied by compressive strength test and microscopic analysis means such as X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA) and scanning electron microscope (SEM). Finally, greenhouse gas emissions were assessed. The results showed that tuff powder had a weak pozzolanic reactivity. Specifically, its pozzolanic reactivity index was 52.5%, which was less than 65%. In general, it cannot be directly used as natural volcanic ash material for cement mortar and concrete. Tuff powder in cementitious materials will play the role of crystal nucleation, which can promote the early hydration of cement. The strength of nucleation effect was related to the fineness of the powder, and the smaller tuff powder had a stronger role in promoting hydration than the granite powder with a larger fineness. From the results of chemically bound water analysis, it was concluded that the hydration degree of tuff powder-cement composite system and fly ash-cement composite system was the same when the addition amount of mineral admixture was 20%, influenced by the nucleation effect and pozzolanic reactivity of tuff powder.
作者简介: 王旭昊,长安大学公路学院副教授、博士研究生导师。2009年本科毕业于爱荷华州立大学土木工程专业,2011年、2014年硕士及博士毕业于爱荷华州立大学道路工程及土木工程材料专业。目前主要从事特殊地区与环境下交通基础设施水泥混凝土结构与材料耐久性的科研工作。发表学术论文及科研报告50余篇,期刊包括Cement and Concrete Composites、ACI Materials Journal、Construction and Building Materials、Magazine of Concrete Research等.
引用本文:
王旭昊, 侯鑫, 甘珑, 汪愿, 边庆华, 张久鹏. 凝灰岩石粉在复合胶凝材料中的火山灰活性及水化性能评估[J]. 材料导报, 2022, 36(16): 22040394-8.
WANG Xuhao, HOU Xin, GAN Long, WANG Yuan, BIAN Qinghua, ZHANG Jiupeng. Pozzolanic Reactivity and Hydration Properties Assessment of Tuff Powder in Composite Cementitious Materials. Materials Reports, 2022, 36(16): 22040394-8.
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2022, Vol. 36 
