施工期混凝土力学性能的试验研究  

Experimental study on mechanical properties of concrete during construction period

作　　者：董振平[1] 王静[1] 胡晓鹏[1] 杨兰 DONG Zhenping;WANG Jing;HU Xiaopeng;YANG Lan(School of Civil Engineering,Xi′an Univ.of Arch.& Tech.,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2018年第6期788-793,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51308441;51678473);陕西省自然科学基础研究计划(2016JM5073);陕西省教育厅专项科研计划项目(2013JK0951)

摘　　要：通过测试施工期混凝土材料的力学性能参数(立方体抗压强度、劈拉强度、轴心抗压强度、弹性模量、应力-应变本构关系曲线),研究了混凝土力学性能随龄期的变化规律,参照相关文献考虑龄期的影响建立了施工期混凝土各力学性能参数的计算模型.研究表明:随着龄期的不断增长,混凝土立方体抗压强度、劈拉强度、轴心抗压强度、弹性模量、应力-应变曲线的峰值应力逐渐增大,而应力-应变曲线的峰值应变逐渐减小;前7d混凝土各力学性能指标变化速度较快,7d后变化速度逐渐变缓.By testing concrete materials in the construction period,the mechanical properties such as cube compressive strength,splitting tensile strength,axial compressive strength,elastic modulus,stress-strain constitutive relation curve were obtained,the change laws of mechanical properties with age were studied.Reference to relevant research results,some calculation models of various mechanical properties with concrete age were established.The results show that with increase of concrete age,some mechanical properties including the cube compressive strength,the splitting tensile strength,the axial compressive strength,the elastic modulus,the peak stress of stress-strain constitutive relation curve increases gradually,but the peak strain of stress-strain constitutive relation curve decreases gradually.The change speed of the mechanical properties is fast in the first 7days after concrete pouring,but the change speed gradually decreased after 7days.

关 键 词：混凝土 施工期 立方体抗压强度 劈拉强度 轴心抗压强度 弹性模量 应力-应变本构关系 

分 类 号：TQ174.75[化学工程—陶瓷工业]