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

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.