- 目录
- 建筑石膏与胶凝材料
- 首页
超早强水泥基材料的设计及试验研究
作者：张志豪1，2，陈露一1，2，郑丽1，2，田宁宁1
（1.中铁大桥科学研究院有限公司，湖北 武汉 430034；2.桥梁结构健康与安全国家重点实验室，湖北 武汉 430034）
摘要：根据原材料粒径级配采用最紧密堆积理论设计了低水胶比的超早强水泥基材料基体，在此基础上，掺入适量的钢纤维制备了超早强水泥基材料，对其工作性能、早期抗压强度、长期收缩性能以及弯曲韧性等进行了研究。结果表明，制备的超早强水泥基材料工作性能符合自密实混凝土的性能要求，4 h抗压强度达到48 MPa，28 d抗压强度达到88 MPa，早期强度较高，后期强度发展稳定，具有较低的长期收缩性能与良好的弯曲韧性。钢纤维的掺入会降低超早强水泥基材料的工作性能与长期收缩性能，但是会显著改善超早强水泥基材料的力学性能，尤其是抗弯拉性能，相比之下混杂钢纤维对超早强水泥基材料力学性能的提高更明显。
关键词：超早强；水泥基材料；钢纤维；自密实；弯曲韧性；干燥收缩
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2019）09-0043-05
Design and experimental study of ultra early strength cement-based materials
ZHANG Zhihao1，2，CHEN Luyi1，2，ZHENG Li1，2，TIAN Ningning1
（1.China Railway Bridge Science Research Institute Ltd.，Wuhan 430034，China；
2.State Key Laboratory for Health and Safety of Bridge Structures，Wuhan 430034，China）
Abstract：The matrix of ultra early strength cement-based materials with low water-binder ratio was designed based on the optimized particle packing theory according to the particle size and graded of raw materials. Based on the obtained experiment，the ultra early strength cement-based materials were produced by adding appropriate volume fraction of steel fiber，the working properties，early compressive strength，long-term shrinkage performance and flexural toughness was studied. The results show that the working performance of ultra early strength cement-based materials could meet the performance requirements of self-compacting concrete，and the compressive strength of 4 h reached 48 MPa，the compressive strength of 28 d reached 88 MPa，their early strength was excellent，late strength of ultra early strength cement-based materials has stable development，lower long-term drying shrinkage and excellent flexural toughness. Fiber would reduce the working performance and long-term shrinkage of ultra early strength cement-based materials，but it can significantly improve the mechanical properties of ultra early strength cement-based materials，especially the flexural-tensile properties. In contrast，the improvement for the mechanical properties of ultra early strength cement-based materials were more marked by hybrid steel fibers.
Key words：ultra early strength，cement-based materials，steel fiber，self-compacting，flexural toughness，drying shrinkage