文献类型：期刊文献

英文题名：Effect of Curing Temperature on High-Strength Metakaolin-Based Geopolymer Composite (HMGC) with Quartz Powder and Steel Fibers

作者：Li, Qiang[1];Chen, Shikun[2];Zhang, Yajun[2];Hu, Yunjin[3];Wang, Quanlin[3];Zhou, Quan[4];Yan, Yongmao[5];Liu, Yi[6];Yan, Dongming[2]

机构：[1]Zhejiang Univ Water Resources & Elect Power, Key Lab Technol Rural Water Management Zhejiang P, Hangzhou 310018, Peoples R China;[2]Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China;[3]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[4]Zhejiang Jiaotou Shengxing Min Co Ltd, Shaoxing 312432, Peoples R China;[5]Shanxi Sanjian Grp Co Ltd, Changzhi 046000, Peoples R China;[6]Zhejiang Univ, Sch Mat Sci & Engn, Inst Composites Sci Innovat, Hangzhou 310027, Peoples R China

年份：2022

卷号：15

期号：11

外文期刊名：MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000808943000001)、、EI(收录号：20222412225716)、Scopus(收录号：2-s2.0-85131758127)、WOS

基金：This research was funded by the National Natural Science Foundation of China (Nos. 52171277 and 52101328).

语种：英文

外文关键词：geopolymer; metakaolin; curing temperature; high strength

外文摘要：Geopolymer is a new type of synthesized aluminosilicate material. Compared with ordinary Portland cement, it has better fire resistance and durability, and is more environmentally friendly. In this paper, a high-strength metakaolin-based geopolymer composite (HMGC) has been developed by utilizing quartz powder and steel fibers. The optimization compositions and effect of curing temperatures (from ambient temperature to 90 degrees C) on the strength performance of the HMGC is studied. The optimized 1-day compressive strength of the HMGC can reach 80 MPa, and the 3-day compressive strength is close to 100 MPa (97.49 MPa). Combined with XRD, FTIR, SEM and MIP characterization, the mechanisms behind the strength development under different curing temperatures are analyzed. The results show that heat curing can significantly speed up the process of geopolymerization and increase the early strength of the HMGC. However, long-term heat curing under high temperature (such as 90 degrees C, 7 days) would reduce the mechanical strength of the HMGC. Prolonged high-temperature curing increases the pores and micro-defects in the gel phase of the HMGC, which may be attributed to chemical shrinkage. Thus, the curing temperature should be carefully controlled to make a HMGC with better performance.