Characterization of Cementitious Phase in NaAlO2-Activated Limestone-based Paste
LIU Yuantao, DONG Biqin, HONG Shuxian, WANG Yanshuai*, FANG Guohao
Shenzhen Key Laboratory for Lowcarbon Construction Material and Technology, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
Abstract: Limestone has a low reactivity in cement-based material. However, when NaAlO2 is used as the activator, the limestone-based cementitious material with good property can be fabricated. Aiming to further analyze the cementitious phase in the NaAlO2-activated limestone paste and clarify the formation mechanism of its property, the reaction process, product proportion, mechanical property and microstructure characteristic of D1 (activated by NaAlO2) and D2 (activated by the mixture of NaOH and Al(OH)3 at a 1∶1 molar ratio) were compared and analyzed in this work. The experimental results showed that both D1 and D2 contained two exothermic peaks. The first peak corresponded to the dissolution of the activator, and the second peak was related to the formation of monocarboaluminate (Mc). The crystallization process of Mc in D1 was faster than that in D2, and the second exothermic peak appeared earlier in D1 than that in D2. In D1, partial NaAlO2 formed Mc. The other consumed part did not form crystal products. They formed the microcrystalline AH3 phase which was between crystal and amorphous state. Transmission electron microscopy (TEM) results indicated that the microcrystalline AH3 phase exhibited the diffraction characteristics of scattered diffraction spots on concentric rings. It had a smaller particle size than gibbsite and yielded a better cementitious characteristic. After curing 28 d, the compressive strength of D1 (22.80 MPa) was significantly higher than that of D2 (0.95 MPa), indicating that AH3 phase was an important cementitious phase in the NaAlO2-activated limestone paste.
通讯作者: *王琰帅,博士,深圳大学土木与交通工程学院助理教授、特聘副研究员、硕士研究生导师,2018年博士毕业于中国香港理工大学土木及环境工程学系。主要从事可持续生态建筑材料研究,包括绿色建材设计、建筑材料耐久性及性能评估、灰渣废弃物资源化及再生应用等。已发表SCI论文40余篇,包括Cement and Concrete Research,Cement Concrete & Composites、NDT & E International、Journal of Cleaner Production、Chemosphere等,申请国内外专利16项,目前已获得国内授权专利6项。yswang@szu.edu.cn
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2024, Vol. 38 
