摘要
为研究煤矸石喷射混凝土的多因素耐久性,通过在单一冻融、单一腐蚀和冻融腐蚀复合作用3种环境下的物理、力学性能试验,获得了3种环境下质量、动弹性模量与单轴抗压强度的演化规律;通过对试验数据进行回归分析,建立了3种环境下煤矸石喷射混凝土性能演化的数学模型。研究结果表明:在质量损失率方面,单一冻融作用影响最大,单一腐蚀作用影响最小,这是由于单一冻融作用时产生的不均匀冻胀更大、剥落更快;在动弹性模量与单轴抗压强度方面,复合作用影响最大,单一腐蚀作用影响最小,这是由于冻融与腐蚀的叠加作用加大了动弹性模量与抗压强度的损失。建立的数学模型与试验数据较为吻合,能够反映煤矸石喷射混凝土在冻融腐蚀作用下的耐久性演化规律。
In order to research the multi-factor durability of coal gangue shotcrete,based on physical and mechanical property tests under three kinds of environment-single freeze-thaw cycles,single corrosion and combining action of freeze-thaw cycles and corrosion,the evolution laws of quality,dynamic modulus of elasticity and uniaxial compressive strength under three kinds of environment were obtained.Through regression analysis based on the test data,mathematical model for property evolution of coal gangue shotcrete under three kinds of environment was established.The results show that single freeze-thaw cycles has the maximum effects on mass loss,while the single corrosion has minimum effects.It＇s due to the uneven frost-heave generated by single freeze-thaw cycles is more powerful and spalling is faster.In terms of dynamic modulus of elasticity and uniaxial compressive strength,combining action has the maximum effects,and single corrosion has minimum effects.Its due to the superposition of freeze-thaw cycles and corrosion increases the loss of dynamic modulus and compressive strength.The mathematical model and test data are relatively identical.The mathematical model is able to reveal the durability evolution laws of coal gangue shotcrete under actions of freeze-thaw cycles and corrosion.
出处
《铁道建筑》
北大核心
2017年第1期151-155,共5页
Railway Engineering
基金
国家自然科学基金(51504125)
关键词
工程材料
煤矸石喷射混凝土
室内试验
数值计算
冻融循环
腐蚀
耐久性
Engineering material
Coal gangue shotcrete
Indoors experiment
Numerical calculation
Freeze-thaw cycles
Corrosion
Durability
