Performance and Hydration of One-part Geopolymer Activated with NaAlO2
TANG Ning1, WANG Yanjun1, ZHAO Mingyu1, SUN Yihan2, WANG Qing1,*
1 School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China 2 Zhejiang Scientific Research Institute of Transport, Hangzhou 310023, China
Abstract: Geopolymer is a new type of cementitious material. Compared with ordinary Portland cement, it has many technical advantages such as green environmental protection, energy saving and low carbon, and excellent performance. At present, geopolymeris manufactured with two-parts materials including alumina-silicate materials and aqueous alkali, which leads to harsh transportation conditions, and difficult to control construction in site. Therefore, it is difficult to apply in civil engineering on a large scale. In view of this, the present work aims to study the performance regulation and hydration mechanism of NaAlO2 on one-part geopolymer. In the raw materials of geopolymer, the alkali solution was changed to a solid alkali activator, and NaAlO2 with 2% of raw material powder was employed to improve its workability. The results reveal that NaAlO2 has a fast hydrolysis rate, and it is easy to generate an Al-rich reaction environment in the early stage of the reaction, and quickly form hydrated calcium aluminosilicate, so that the one-part geopolymer can prolong the setting time without changing the compressive strength, and the microstructure also tends to gel and densify. Hence, the adding of a small amount of NaAlO2 is conducive to breaking through the technical bottleneck of the current application of two-parts geopolymer and promoting the large-scale application of geopolymer in engineering.
通讯作者:
*王晴,沈阳建筑大学材料科学与工程学院二级教授、博士研究生导师。目前主要从事固体废弃物在建筑材料中的资源化利用等方面的研究工作。发表论文100余篇,包括Construction and Building Materials、Journal of Cleaner Production等。wangqingmxy@126.com
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2024, Vol. 38 
