不同应变率下橡胶混凝土抗压性能及能量特性研究

摘要/Abstract

摘要： 对四种橡胶体积掺量(0%、5%、10%、20%)的级配良好橡胶混凝土开展单轴抗压试验,对力学性能和破坏形态方面进行分析,得到了橡胶混凝土综合性能最优时的橡胶掺量,进而对最优掺量组进行不同应变率下的单轴压缩试验,并分析了不同应变率下橡胶混凝土的能量特性。试验结果表明,橡胶混凝土表现为裂而不散的类延性破坏,而非普通混凝土的脆性破坏。随着橡胶掺量的增加,抗压强度大幅降低,但变形能力得到增强,在掺量为10%时,橡胶混凝土的抗压强度达标,变形能力最好。橡胶混凝土受压时能量演化和转化过程是输入能先大量转化为弹性能并储存;接着耗散能转化率开始增加,使试件表面产生大量微裂纹;最后弹性能快速释放,耗散能转化率占比明显提高,从而导致试件整体破坏。另外随着应变率增大,橡胶混凝土的抗压强度和初始弹性模量明显提高,而峰值应变降低,同时输入总能量、弹性能与耗散能均呈现上升趋势,其中弹性能增加更明显。

关键词: 橡胶混凝土, 单轴压缩, 掺量, 强度, 应变率, 能量演化

Abstract: Uniaxial compression tests were carried out on four kinds of well-graded rubber concrete with different rubber volume content (0%, 5%, 10%, 20%). The mechanical properties and failure modes were analysed, and the rubber content was determined when the comprehensive performance of rubber concrete was optimal. Then, the uniaxial compression experiments of the optimal dosage group under different strain rates were carried out, and the energy characteristics of rubber concrete under different strain rates were analysed. Results show that the rubber concrete is characterised by ductile failure, rather than brittle failure of ordinary concrete. With the increase in rubber content, the compressive strength decreases significantly, but the deformation ability is enhanced. When the rubber content is 10%, the compressive strength of rubber concrete reaches the standard, and the deformation ability is the best. The typical energy evolution and transformation process of rubber concrete under compression is that the input energy is first converted into elastic energy and stored; then, the conversion rate of dissipated energy begins to increase, resulting in a large number of micro-cracks on the surface of the specimen. Finally, the elastic energy is rapidly released, and the proportion of the conversion rate of dissipative energy is significantly improved, resulting in the overall failure of the specimen. In addition, with the increase of strain rate, the compressive strength and initial elastic modulus of rubber concrete increase significantly, while the peak strain decreases. At the same time, the total input energy, elastic energy and dissipation energy show an upward trend, and the elastic energy increases more obviously.

Key words: rubber concrete, uniaxial compression, dosage, intensity, strain rate, energy evolution

中图分类号:

TU528

韩辰悦, 庞建勇. 不同应变率下橡胶混凝土抗压性能及能量特性研究[J]. 硅酸盐通报, 2022, 41(3): 922-930.

HAN Chenyue, PANG Jianyong. Compressive Properties and Energy Characteristics of Rubber Concrete under Different Strain Rates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 922-930.

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