Development of a High Early Strength Non-fuorine and Non-alkaline Flash Setting Admixture and Flash Mechanism  

作　　者：SUN Guowen YANG Xinyu WANG Fengjuan WANG Jinshuo LIU Zhiyong 孙国文;刘志勇

机构地区：[1]College of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China [2]College of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第6期1518-1527,共10页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Research and Development Program of China(No.2021YFB2601200);the Natural Science Foundations of Hebei Province(No.E2022210103)。

摘　　要：To solve the problems of high rebound rate and strength reversion of shotcrete,a non-fluorine and non-alkaline liquid flash setting admixture(FSN)with low rebound and high early strength was synthesized under 60-65℃water bath environment through orthogonal test design and taking setting time and compressive strength as indicators.The experimental results show that the optimum mass ratio of FSN is aluminum sulfate:diethanolamine:triethanolamine:pseudo-boehmite:lithium carbonate:water=57%:8%:0.05%:2%:2%:31%.When FSN is added with 7%of the mass of portland cement,the cement paste can be initially set in 3 min and finally set in 5 min.The compressive strength of mortar is 1.2 MPa at 6 h,18.0 MPa at 1 d,and more than 100%at 28 days;The microscopic analysis shows that the rapid release of Li^(+),NH^(4+),and CO_(3)^(2-)ions by FSN in the paste solution effectively shortens the induction period of high C_(3)S content in Portland cement,directly forms early coagulation AFt crystals in FSN and CH dominated by Al_(2)(SO_(4))_(3),and forms a large number of C-S-H gels in the later stage,so that the cement can quickly coagulate and harden,and the strength in the later stage is not retracted.

关 键 词：SHOTCRETE flash setting admixture aluminum sulfate high early strength flash mechanism 

分 类 号：TU528.042[建筑科学—建筑技术科学]