钢-塑钢混杂纤维再生混凝土单轴压缩动态力学性能试验  

Experiment on dynamic mechanical properties of steel and macro-polypropylene hybrid fibers reinforced recycled aggregate concrete under uniaxial compression

作　　者：冯俊杰[1] 尹冠生[1] 刘柱 梁建红 张云杰 牛志强[3] 王鹏博 FENG Junjie;YIN Guansheng;LIU Zhu;LIANG Jianhong;ZHANG Yunjie;NIU Zhiqiang;WANG Pengbo(School of Science,Chang’an University,Xi’an 710064,China;Shaanxi Tietou Engineering Testing Technology CO.,LTD.,Xi’an 710304,China;School of Civil Engineering and Architecture,Zhengzhou University of Science and Technology,Zhengzhou 450064,China)

机构地区：[1]长安大学理学院,西安710064 [2]陕西铁投工程检测科技有限公司,西安710304 [3]郑州科技学院土木建筑工程学院,郑州450064

出　　处：《复合材料学报》2022年第11期5386-5402,共17页Acta Materiae Compositae Sinica

基　　金：长安大学博士研究生创新能力培养资助项目(300203211121);陕西省交通运输厅交通科研项目(21-67K);长安大学相变蓄能建筑材料创新开放实验室项目(2018CXSY06);河南省科技厅科技攻关项目(182102311091);郑州科技学院自然科学项目(2017-XYZK-002)。

摘　　要：为探究钢-塑钢混杂纤维再生混凝土的压缩动态力学性能,设计了A、B和C 3个系列混杂纤维再生混凝土包含3种再生粗骨料取代率和5种体积分数1.5vol%的钢纤维和塑钢混掺纤维组合,采用了4种加载应变率。试验表明:随应变率增加,混杂纤维再生混凝土峰值应力、弹性模量和压缩韧性增大,峰值应变减小。相较于基准组,在相同应变率下3个系列中的含纤维组峰值应力最大增幅分别为23%、16%和16%;峰值应变最大增幅分别为19%、12%和13%;弹性模量最大增幅分别为15%、14%和35%;压缩韧性最大增幅分别为46%、32%和37%。在试验应变率范围内,再生粗骨料显著提高峰值应力、弹性模量和压缩韧性的应变率敏感性,对峰值应变的应变率敏感性并无明显影响;掺入纤维降低混凝土峰值应变和弹性模量的应变率敏感性,提高普通混凝土峰值应力和压缩韧性的应变率敏感性,降低再生混凝土峰值应力和压缩韧性的应变率敏感性。提出的动态损伤本构模型考虑了纤维增强系数、再生粗骨料取代率和应变率,计算结果与试验结果吻合较好。The dynamic compressive behavior of hooked-end steel(HES)and macro-polypropylene(MPP)hybrid fibers reinforced recycled aggregate concrete(HyF/RAC)was studied.Three series(A,B and C)of HyF/RAC specimens were designed,which include three different recycled coarse aggregates(RCA)replacement ratios and five combinations of hybrid fibers at the total volume fraction of 1.5vol%,and four different strain rates were conducted.The results show that with the increase of strain rate,the peak stress,elastic modulus and compressive toughness increase,while the peak strain decreases.Compared with control groups in three series under the same strain rate,the largest increases of peak stress for specimens with fibers are 23%,16%and 16%,respectively.The largest increases of peak strain are 19%,12%and 13%,respectively.The largest increases of elastics modulus are 15%,14%and 35%,respectively.The largest increases of compressive toughness are 46%,32%and 37%,respectively.In the strain rate range,the strain rate sensitivity of peak stress,elastic modulus and compressive toughness increase with the RCA,and the RCA replacement ratio does not affect the strain rate sensitivity of peak strain.The strain rate sensitivity of peak strain and elastics modulus decrease with the addition of fiber.The addition of fibers enhances the strain rate sensitivity of peak stress and compressive toughness for natural aggregate concrete(NAC).While the strain rate sensitivity of peak stress and compressive toughness decrease for recycled aggregate concrete(RAC).The dynamic constitutive damage model was proposed considering the reinforcing index of fibers,RCA replacement ratio and strain rates.And all the models agree well with the experimental curves.

关 键 词：混杂纤维再生混凝土 单轴压缩 动态力学性能 动态增长因子 应变率敏感性 动态损伤本构模型 

分 类 号：TV431[水利工程—水工结构工程]