不利环境下水工混凝土抗裂性试验研究  

Experimental Study on Crack Resistance of Hydraulic Concrete under Adverse Environment

作　　者：张成哲 ZHANG Cheng-zhe(Yingkou Urban Water Conservancy Investigation Construction Design Institute,Yingkou 115000,China)

机构地区：[1]营口市水利勘测建筑设计院,辽宁营口115000

出　　处：《黑龙江水利科技》2023年第1期1-4,54,共5页Heilongjiang Hydraulic Science and Technology

摘　　要：文章应用环境试验箱模拟盐渍土侵蚀及大温差不利环境下,不同矿粉-粉煤灰掺量及基准组水工混凝土的抗折抗折强度及抗裂性能。试验表明:矿物掺合料的掺入可以提高水工混凝土强度增长速率和抗裂性能,但会降低其力学性能;掺20%矿粉和15%粉煤灰混凝土较基准混凝土3~14d抗压强度增长率提高164.7%,28d断裂能提高50.74%,早期具有较高的抗压和抗折强度增长速率;经SEM微观分析,掺入适量的矿物掺合料可以明显减小裂缝宽度,改善混凝土孔隙结构、密实度及其抗裂性能。In this paper, the environmental test chamber is used to simulate the flexural strength and crack resistance of hydraulic concrete with different slave-fly ash content and reference group under the adverse environment of saline soil erosion and large temperature difference. The results show that the addition of mineral admixtures can improve the strength growth rate and crack resistance of hydraulic concrete, but reduce its mechanical properties. Compared with the benchmark concrete, the concrete mixed with 20% mineral powder and 15% fly ash has 164.7% higher compressive strength growth rate at 3-14d and 50.74% higher fracture energy at 28d, and has higher compressive and flexural strength growth rate at early stage. SEM analysis shows that the proper amount of mineral admixtures can significantly reduce the crack width and improve the pore structure, compactness and crack resistance of concrete.

关 键 词：不利环境 矿物掺合料 抗裂性能 微观结构 

分 类 号：TV431[水利工程—水工结构工程]