C100混凝土的力学性能及应力-应变曲线  

Mechanical properties and stress-strain curve of C100 concrete

作　　者：蔺喜强[1] 张涛[1] 霍亮[1] 张楠[1] 李国友[1] 戢文占 李小龙 LIN Xiqiang;ZHANG Tao;HUO Liang;ZHANG Nan;LI Guoyou;JI Wenzhan;LI Xiaolong(Technology Center,China Construction Co.,Ltd.,Beijing 101300,China;China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国建筑股份有限公司技术中心,北京101300 [2]中国矿业大学(北京),北京100083

出　　处：《混凝土》2020年第5期85-89,共5页Concrete

基　　金：中建股份(CSCEC-2017-Z-8);中建股份科技研发计划资助(CSCEC-2019-Z-24)。

摘　　要：利用刚性辅助装置测试C100超高强的素混凝土和纤维混凝土的应力-应变曲线,同时对长龄期的C100超高强混凝土抗压强度、静压力弹性模量等力学性能的发展趋势进行研究。试验结果表明C100超高强混凝土应力-应变曲线采用刚性辅助装置测试是比较便捷和有效的试验方法,高强混凝土应力应变全曲线显示当混凝土所受荷载达到最大时,混凝土的破坏具有突变性,应力应变曲线没有明显的缓冲阶段,只有上升阶段和下降阶段两个过程。另外,钢纤维超高强混凝土应力应变曲线的变化规律也基本一致,但钢纤维的掺加能够使混凝土的在荷载作用下的应变得变化具有更加稳定和平缓的特点,达到破坏突变点后应力应变曲线平稳下降,说明钢纤维能够明显的改善高强混凝土的脆性。同时,水胶比为0.18的超高强混凝土,混凝土的28 d抗压强度超过100 MPa,随着养护龄期达到180、360 d时,混凝土的抗压强度在此过程中仍然继续增长。两组混凝土在360 d时的抗压强度分别达到了150.1、163.7 MPa,并且它们的静压力弹性模量在56 d龄期时在50 GPa左右。The stress-strain curves of C100 ultra-high strength concrete and fiber concrete were tested by rigid auxiliary device.At the same time,the development trend of mechanical properties such as compressive strength and static pressure elastic modulus of long-term C100 super high strength concrete was studied.The experimental results show that it is a convenient and effective experimental method to test the stress-strain curve of C100 ultra-high strength concrete with rigid device.When the load on the concrete reaches the maximum,the stress-strain curve of the high-strength concrete shows that the concrete damage has abrupt change,and the stress-strain curve has no obvious buffer stage,only two processes of the ascending phase and the descending phase.At the same time,the trend of stress-strain curves of steel fiber super-high-strength concrete is basically the same,but the addition of steel fiber can make the change of concrete under load more stable and gentle,indicating that steel fiber can improve brittleness of super high-strength concrete.In addition,the super high strength concrete with water to binder ratio of 0.18,the compressive strength of concrete at 28 days exceeds 100 MPa,and the compressive strength of concrete continues to increase during the process as the curing age reaches 180 days and 360 days.The compressive strength of the concrete in the two groups reached 150.1 MPa and 163.7 MPa at 360 days.And their static pressure modulus of elasticity can reach about 50 GPa at 56 days.

关 键 词：C100超高强混凝土 应力应变曲线 长龄期养护 抗压强度 

分 类 号：TU528.31[建筑科学—建筑技术科学]