EPS混凝土的早龄期抗冲击性能  

Impact Resistance of EPS Concrete at Early Ages

作　　者：周静[1] 王文飞 胡南 ZHOU Jing;WANG Wen-fei;HU Nan(Department of Urban Construction,Taiyuan City Vocational College,Taiyuan 030027,China;CCCC First Highway Consultants Co.,Ltd.,Xi′an 710075,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]太原城市职业技术学院城建系,太原030027 [2]中交第一公路勘察设计研究院有限公司,西安710075 [3]郑州大学土木工程学院,郑州450001

出　　处：《爆破》2024年第3期149-155,178,共8页Blasting

基　　金：山东省自然科学基金面上项目(ZR2021ME004)。

摘　　要：对早龄期(12 h、24 h、36 h)的EPS混凝土进行了动态力学试验,从动态抗压强度、峰值应变、极限应变和能耗密度等方面分析了冲击速度(4.5~6.5 m/s)和龄期(12 h、24 h、36 h)对EPS混凝土抗冲击性能的影响,并与28 d龄期时EPS混凝土的性能进行了对比。结果表明:EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度均具有冲击速度强化效应。随着龄期的增大,EPS混凝土的动态力学性能指标及其对冲击速度的敏感性不断增大。28 d龄期时,EPS混凝土的动态抗压强度、峰值应变、极限应变和能耗密度最大,其对冲击速度的敏感性最强。EPS混凝土早龄期具有良好的变形和吸能特性。36 h龄期时,EPS混凝土的峰值应变、极限应变和能耗密度分别可达到28 d龄期时的66%~82%、91%~93%和72%~78%。Dynamic mechanical tests were carried out on EPS concrete at early ages(12 h、24 h and 36 h).Whereafter,the influences of impact velocity(4.5~6.5 m/s)and age(12 h、24 h and 36 h)on impact resistance of EPS concrete were analyzed in terms of dynamic compressive strength,peak strain,ultimate strain and energy dissipation density.Additionally,the properties of EPS concrete at early ages were compared with that at the age of 28 d.The results show that the dynamic compressive strength,peak strain,ultimate strain,and energy dissipation density of EPS concrete have an impact on the velocity-strengthening effect.With the increase of age,the dynamic mechanical property indicators of EPS concrete and its sensitivity to impact velocity increase.At the age of 28 d,the dynamic compressive strength,peak strain,ultimate strain and dissipation density of EPS concrete are the maximum,and its sensitivity to impact velocity is the strongest.EPS concrete has good deformation and energy absorption characteristics at the early age.At the age of 36 h,the peak strain,ultimate strain and energy dissipation density of EPS concrete can reach 66%~82%,91%~93%and 72%~78%of that at the age of 28 d,respectively.

关 键 词：EPS混凝土 抗冲击性能 龄期 变形特性 吸能特性 

分 类 号：TU528[建筑科学—建筑技术科学]