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- 建筑石膏与胶凝材料
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多元复合超早强水泥基材料的性能研究
作者：盖珂瑜1，2，陈露一1，2，龙勇1，2，张志豪1，3，黄有强1，3
（1.桥梁结构健康与安全国家重点实验室，湖北 武汉 430034；
2.中铁大桥科学研究院有限公司，湖北 武汉 430034；
2.中铁大桥科学研究院有限公司，湖北 武汉 430034；
3.中铁桥研科技有限公司，湖北 武汉 430034）
摘要：研究了不同掺量石灰石粉和普通硅酸盐水泥对硫铝酸盐水泥凝结时间和力学性能的影响，采用水化热测试对水化进程进行了分析，同时，采用DTG对水化产物进行了综合热分析。结果表明：石灰石粉的掺入，缩短了终凝时间，降低了抗压强度；普通硅酸盐水泥的掺入，提高了硫铝酸盐水泥的水化速率，促进了C-S-H凝胶和AFt的生成；随着普通硅酸盐水泥掺量的增加，胶砂的早期强度逐渐降低，后期强度逐渐提高，当普通硅酸盐水泥掺量为40%时，5 h抗压强度最高，为35.9 MPa，当普通硅酸盐水泥掺量为80%时，28 d抗压强度最高，为94.5 MPa。
关键词：硫铝酸盐水泥；普通硅酸盐水泥；超早强；石灰石粉；凝结时间；力学性能
中图分类号：TU57+8.13 文献标识码：A 文章编号：1001-702X（2023）01-0128-05
Study on properties of multivariate composite ultra-early strength cement-based materials
GE Keyu1，2，CHEN Luyi1，2，LONG Yong1，2，ZHANG Zhihao1，3，HUANG Youqiang1，3
（1.State Key Laboratory for Health and Safety of Bridge Structures，Wuhan 430034，China；2.China Railway Bridge Science Research Institute Ltd.，Wuhan 430034，China；3.China Railway Britech Co. Ltd.，Wuhan 430034，China）
Abstract：In this paper，the effects of limestone and ordinary Portland cement（OPC） on setting time and mechanical property of sulphoaluminate cement（SAC） based on ultra-early strength materials were studied. The hydration process was analyzed by hydration heat，and the comprehensive thermal analysis of the hydration products was conducted by DTG. Results indicated that the final setting time and compressive strength of ultra-early strength mortar decreased with the increase of the amount of limestone. The addition of OPC increased the hydration of SAC and promoted the formation of C-S-H gel and AFt. In addition，with the increase of the amount of OPC，the compressive strength of mortar decreased in early age and increased in late age. The compressive strength of mortar added with 40% OPC can reach 35.9 MPa when curing at 5 h，while the compressive strength of mortar added with 80% OPC can reach 94.5 MPa when curing at 28 d.
Key words：sulphoaluminate cement，ordinary Portland cement，ultra-early strength，limestone，setting time，mechanical property