引气剂和再生骨料对混凝土动态力学性能影响  

Study on the influence of air-entraining agent and recycled aggregate on the dynamic mechanical properties of concrete

作　　者：王鑫 李亚军 杜西江 WANG Xin;LI Yajun;DU Xijiang(The Fifth Engineering Co.,Ltd.,of China Communications First Public Bureau,Beijing 100024 China)

机构地区：[1]中交一公局第五工程有限公司,北京100024

出　　处：《山东交通科技》2020年第6期35-39,共5页

摘　　要：通过改变引气剂掺量和再生骨料替代率制备出再生骨料混凝土,研究引气剂掺量和RCA的替代百分比对纤维增强再生骨料混凝土动态特性影响。结果表明,随再生骨料替代率增加,混凝土抗压强度和抗折强度呈下降趋势,尤其是当引气剂掺量大于0.072 kg/m3时,下降趋势更明显。与基准混凝土相比,再生混凝土阻尼比分别提高到1.78%(50RCA-A1)和1.99%(100RCA-A2)。引气剂掺加对再生混凝土阻尼比有积极影响,但考虑到对混凝土力学性能影响,建议掺量不超过0.072 kg/m3。Recycled aggregate concrete was prepared by varying the amount of air-entraining agent and the replacement rate of recycled aggregate.The effects of the amount of air-entraining agent and the percentage of RCA substitution on the dynamic properties of fiber-reinforced recycled aggregate concrete were studied.The results show that as the replacement rate of recycled aggregates increases,the compressive strength and flexural strength of concrete show a downward trend,especially when the amount of air-entraining agent is greater than 0.072 kg/m3,the downward trend is more obvious.Compared with the benchmark concrete,the damping ratio of recycled concrete is increased to 1.78%(50RCA-A1)and 1.99%(100RCA-A2),respectively.The addition of airentraining agent has a positive effect on the damping ratio of recycled concrete,but considering the effect on the mechanical properties of concrete,it is recommended that its content should not exceed 0.072 kg/m3.

关 键 词：再生混凝土 再生骨料 界面过渡区 动态特性 阻尼机制 

分 类 号：U416.216[交通运输工程—道路与铁道工程]