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人工砂最大粒径对水工高延性纤维增强水泥基复合材料性能的影响研究
作者：石妍1，2，李家正1，2，吕兴栋1，2，李杨1，2，蒋文广1，2
（1.长江科学院 材料与结构研究所，湖北 武汉 430010；
2.水利部水工程安全与病害防治工程技术研究中心，湖北 武汉 430010）
摘要：研究了人工砂最大粒径对水工高延性纤维增强水泥基复合材料（ECC）拌合物、力学及变形性能的影响规律。结果表明，水工ECC具有中等强度、低弹性模量、高延性的特点。拌合物状态相当时，每降低1个砂的最大粒级，水工ECC的用水量增加5 kg/m3。试验中试件均符合C25强度等级要求，静压弹性模量、泊松比平均值分别为20 GPa、0.29。人工砂越细，水工ECC的力学强度与弹性模量均有所提高，极限延伸率明显增大，人工砂最大粒径为1.25 mm时，可满足极限延伸率≥2%的技术要求。水工ECC可用于坝基廊道、堆石坝面板或心墙等抗裂关键部位。
关键词：水工ECC；人工砂；最大粒径；力学；变形性能
中图分类号：TU528.36 文献标识码：A 文章编号：1001-702X（2022）10-040-05
Influence of the maximum particle size of artificial sand on the performance of hydraulic ECC mixtures
SHI Yan1，2，LI Jiazheng1，2，LV Xingdong1，2，LI Yang1，2，JIANG Wenguang1，2
（1.Material and Structure Department，Changjiang River Scientific Research Institute，Wuhan 430010，China；
2.Research Center of Water Engineering Safety and Disaster Prevention of Ministry of Water Resources，Wuhan 430010，China）
Abstract：In this paper，the influence of the maximum particle size of artificial sand on the mechanical and deformation properties of hydraulic ECC mixtures is studied. The test results show that hydraulic ECC has the performance characteristics of medium strength，low elastic modulus and high ductility. While maintaining a considerable mixture state，the water consumption of the hydraulic ECC increases by 5 kg/m3 for each reduction of the maximum particle size of sand. The specimens meets the strength grade of C25，the mean values of compressive elastic modulus and Poisson's ratio are 20 GPa and 0.29，respectively. The finer the artificial sand，the higher the mechanical strength and elastic modulus，and the greater the ultimate elongation. When the maximum particle size of the sand is 1.25 mm，it can meet the technical requirements of not less than 2% ultimate elongation. Hydraulic ECC can be used in key crack-resistant parts such as dam foundation gallery，rockfill dam face or core wall.
Key words：hydraulic ECC，artificial sand，maximum particle size，mechanics，deformation properties