两种养护制度下C100高强混凝土韧性对比试验研究

摘要/Abstract

摘要： 高强混凝土在服役期间易遭受冲击破坏,有必要配制出强度和抗冲击性能有一定保证的高性能混凝土。本文借助常压和高压养护工艺,设计出C100高强混凝土,并从宏观和微观两个层面对其韧性差异规律与机理进行探讨。结果表明:28 d龄期内,两种养护制度下混凝土抗压强度相差较小,但劈裂抗拉强度、抗折强度相差较大;高压养护混凝土的韧性要优于常压养护混凝土,其拉压比、折压比、初裂冲击耗能平均值分别为常压养护混凝土的1.37倍、1.21倍和1.24倍。与常压养护混凝土相比,高压养护混凝土内部掺合料反应随龄期发展更为充分,水化硅酸钙(C-S-H)呈絮凝状,从而更易填充孔隙、裂缝等内部薄弱区;高压养护混凝土水化产物中无板状Ca(OH)₂,C-S-H能有效发挥桥接作用。此次配制的高压养护混凝土具有更优的韧性。

关键词: 高强混凝土, 常压养护, 高压养护, 力学性能, 抗冲击性能, 微观结构

Abstract: High-strength concrete is vulnerable to impact damage during service, so it is necessary to prepare high-performance concrete with certain guarantee of strength and impact resistance. In this paper, C100 high-strength concrete was designed with normal-pressure and high-pressure curing process, and its toughness difference law and mechanism were discussed from macroscopic and microscopic levels. The test results show that the difference of compressive strength of concrete under the two curing systems is small, but the difference of splitting tensile strength and flexural strength is big within 28 d. At the same time, the toughness of high-pressure curing concrete is better than that of normal-pressure curing concrete, and its tension-compression ratio, flexural-compression ratio and initial cracking impact energy consumption are 1.37 times, 1.21 times and 1.24 times of that of normal-pressure curing concrete on average. Compared with normal-pressure curing concrete, the internal admixture reaction of high-pressure curing concrete develops more fully with age, and calcium silicate hydrate (C-S-H) is flocculent, which makes it more easily fill the internal weak areas such as pores and cracks. There is no plate-like Ca(OH)₂ in the hydration products of high-pressure curing concrete, and C-S-H effectively plays a bridging role. The prepared high-pressure curing concrete has better toughness.

Key words: high-strength concrete, normal-pressure curing, high-pressure curing, mechanical property, impact resistance, microstructure

中图分类号:

TU528

张虹宇, 郑玉龙, 陆春华. 两种养护制度下C100高强混凝土韧性对比试验研究[J]. 硅酸盐通报, 2023, 42(4): 1252-1259.

ZHANG Hongyu, ZHENG Yulong, LU Chunhua. Comparative Experimental Study on Toughness of C100 High-Strength Concrete under Two Curing Systems[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1252-1259.

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