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高性能无碱液体速凝剂的研究与应用
作者：李崇智1，邓松文1，董鹏2，熊梦琴2，万海仑2，黎高财2
（1.北京建筑大学 土木与交通工程学院，北京 100044；
2.中铁十一局集团桥梁有限公司抚州工业分公司，江西 抚州 344113）
摘要：在65 ℃条件下将硫酸铝、二乙醇胺、硫酸镁以一定比例混合溶解，再掺加一种二乙醇胺羧酸酯与硅溶胶的络合稳定剂，合成了高性能无碱无氟液体速凝剂HLA，对其性能进行测试。结果表明：在环境温度-10~30 ℃条件下速凝剂HLA储存2个月的性能稳定；掺量为7%~8%时，对不同牌号普通硅酸盐水泥的初凝时间为2~4 min，终凝时间为6~10 min；水泥胶砂6 h抗压强度约1.0 MPa，1 d抗压强度为11.0~15.0 MPa，28 d抗压强度比>100%，符合Q/CR 807—2020《隧道喷射混凝土用液体无碱速凝剂》通用要求。
关键词：无碱液体速凝剂；稳定性；适应性；早期强度
中图分类号：TU528.042+.1 文献标识码：A 文章编号：1001-702X（2023）02-0059-04
Study and application of high-performance alkali-free liquid accelerator
LI Chongzhi1，DENG Songwen1，DONG Peng2，XIONG Mengqin2，WAN Hailun2，LI Gaocai2
（1.School of Civil and Traffic Engineering，Beijing University of Civil Engineering and Architecture，Beijing 100044，China；2.Fuzhou Industrial Branch of China Railway 11th Bureau Group Bridge Co. Ltd.，Fuzhou 344113，China）
Abstract：At 65 ℃，aluminum sulfate，diethanolamine and magnesium sulfate were mixed and dissolved in a certain proportion into a solution，and then a complexing stabilizer of diethanolamine carboxylate ester and silica sol was added to synthesize high performance alkali-free fluorine-free liquid accelerating agent HLA. Then its properties were tested. The experimental results show that the performance of HLA accelerator is stable when stored at ambient temperature of -10~30 ℃ for 2 months. According to the content of 7%~8% for different ordinary Portland cement，the setting time meets the initial setting of 2~4 min，the final setting of 6~10 min：The compressive strength of cement mortar is about 1.0 MPa in 6 h，11.0~15.0 MPa in 1 d，and the compressive strength ratio is >100% in 28 d，meeting the general requirements of Q/CR 807—2020 "Liquid alkali-free accelerating agent for tunnel shotcrete".
Key words：alkali-free liquid accelerator，stability，adaptability，early strength