Equal-amplitude cyclic (50 times) high stress loading test and uniaxial compression test were conducted on concrete specimen groups (with rubber dosages of 0%, 5%, 10%, 15%, 20%, respectively) to study the mechanical and deformation characteristics of rubber concrete (RC) under repeated loading. The change of uniaxial mechanical properties of concrete with varied rubber content before and after cyclic loading and the deformation during cyclic loading were analyzed. Results unveiled that with the growth of rubber content, the peak stress and modulus of elasticity of specimens decreased accordingly, while peak strain increased. During cyclic loading, the total strain, elastic strain and plastic strain curves of RC were significantly higher than those of normal concrete (NC); but the relative strain range was smaller than that of NC, displaying good ductility and stability. After cyclic loading, the degradation of NC’s peak stress and elastic modulus reached 11.0% and 36.8%, respectively, whereas the deterioration of RC’s corresponding index declined with the growth of rubber content. According to efficacy coefficient analysis, the mechanical properties of RC-1 (RC with 5% rubber content) was the optimum, followed by those of RC-2 (RC with 10% rubber content), RC-4 (RC with 20% rubber content), RC-3 (RC with 15% rubber content), and NC. The optimum rubber content was 5%-10%. The research results can provide a theoretical basis for the application of rubber concrete in engineering.
Key words
rubber concrete /
equal-amplitude cyclic loading /
deformation properties /
degradation analysis /
efficiency coefficient method
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References
[1] 钱 震,庄 勇,方 海,等. 弹性混凝土在工程结构中的应用探讨[J].混凝土,2016(9):124-127.
[2] 刘松岸,刘亚飞. 改性处理对橡胶混凝土力学性能及耐久性影响研究[J].混凝土,2018(7):34-36,45.
[3] 赵志远,毕 乾,王立燕,等. 废橡胶颗粒改性水泥基材料的塑性开裂和抗冲击性能[J].混凝土与水泥制品,2008(4):1-5.
[4] 李 悦,王 玲.橡胶集料混凝土研究进展综述[J].混凝土,2006(4):91-93,95.
[5] 陈 波,张亚梅,陈胜霞,等. 橡胶混凝土性能的初步研究[J].混凝土,2004(12):37-39.
[6] 陈胜霞,张亚梅,罗天岚,等. 橡胶颗粒细度、掺量及成型工艺对橡胶混凝土抗冻性能的影响[J].工业建筑,2013,43(增刊1):617-621.
[7] 杨 锐,王 兆. 碾压橡胶混凝土在工程中的应用研究[J].混凝土,2011(12):139-141.
[8] 亢景付,任海波,张平祖.橡胶混凝土的抗裂性能和弯曲变形性能[J].复合材料学报,2006(6):158-162.
[9] KANG Jing-fu, JIANG Yong-qi. Improvement of Cracking-resistance and Flexural Behavior of Cement-based Materials by Addition of Rubber Particles[J]. Journal of Wuhan University of Technology: Materials Science Edition, 2008, 23(4): 579-583.
[10]SANG S K, IMAN H, KYPROS P. Strength and Deformability of Waste Tyre Rubber-filled Reinforced Concrete Columns[J]. Construction and Building Materials, 2011, 25(1): 218-226.
[11]HANY N F, HANTOCHE E G, HARAJLI M H. Axial Stress-strain Model of CFRP-confined Concrete under Monotonic and Cyclic Loading[J]. Journal of Composites for Construction, 2015, 19(6): 1-16.
[12]HE W, WU Y F, LIEW K M A. Fracture Energy Based Constitutive Model for the Analysis of Reinforced Concrete Structures under Cyclic Loading[J]. Computer Methods in Applied Mechanics and Engineering, 2008, 197(51/52): 4745-4762.
[13]邓华锋,肖志勇,李建林,等.水岩作用下损伤砂岩强度劣化规律试验研究[J].岩石力学与工程学报,2015,34(增刊1):2690-2698.
[14]杨振兴,王 浩,周建军,等.功效系数法在TBM选型定量化决策中的应用[J].地下空间与工程学报,2018,14(3):799-804.
[15]王迎超,尚岳全,孙红月,等.基于功效系数法的岩爆烈度分级预测研究[J].岩土力学,2010,31(2):529-534.
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