高温及冻融后蒸压轻质混凝土力学性能研究  

Mechanical Properties of Autoclaved Lightweight Concrete after High Temperature and Freeze-thaw

作　　者：马芹永[1,2] 李龙钰 袁璞[1,2] 王静峰[3] 王波[3] 沈万玉 MA Qinyong;LI Longyu;YUAN Pu;WANG Jingfeng;WANG Bo;SHEN Wanyu(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China;Engineering Reseach Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of Civil Hydraulic Engineering,Hefei University of Technology,Hefei Anhui 230009,China;Technology Center of Anhui Fuhuang Steel Structure Co.,Ltd,Hefei Anhui 238076,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001 [3]合肥工业大学土木与水利工程学院,安徽合肥230009 [4]安徽富煌钢构股份有限公司技术中心,安徽合肥238076

出　　处：《安徽理工大学学报（自然科学版）》2023年第1期47-51,共5页Journal of Anhui University of Science and Technology:Natural Science

基　　金：安徽省高校协同创新项目(GXXT-2019-005);安徽理工大学研究生创新基金资助项目(2021CX2031)。

摘　　要：为研究蒸压轻质混凝土结构在高温-冻融耦合作用下力学性能的变化情况,将不同高温处理后的蒸压轻质混凝土试件经过冻融循环试验后进行静态力学性能试验,研究了不同温度、不同冻融方法对蒸压轻质混凝土试件抗压强度、弹性模量、应力应变关系、能量吸收的影响。试验结果表明,蒸压轻质混凝土试件经高温与冻融循环耦合作用后,随着处理温度增加,其抗压强度减小,弹性模量降低,塑性提高,应力应变曲线变平缓,峰值应力减小,峰值应变增加,能量吸收减小,盐冻冻融循环相较于水冻冻融循环对高温处理后试件的力学性能劣化影响更大,使得试件破坏所需吸收的能量更小。In order to study the change of mechanical properties of autoclaved lightweight concrete structure under the action of high temperature freeze-thaw coupling,the autoclaved lightweight concrete specimens treated at different high temperatures were subjected to freeze-thaw cycle tests,and the static mechanical properties were tested.The effects of different temperatures and freeze-thaw methods on compressive strength,elastic modulus,stress-strain relationship and energy absorption of autoclaved lightweight concrete specimens were studied.The test results show that after the autoclaved lightweight concrete specimens are coupled by high temperature and freeze-thaw cycles,with the increase of treatment temperature their compressive strength and elastic modulus decrease,while the plasticity increase,the stress-strain curve become flatter,the peak stress and energy absorption decrease and the peak strain increase.Compared with water freeze-thaw cycles,salt freeze-thaw cycles have a greater influence on the deterioration of mechanical properties of specimens after high temperature treatment,which makes the destroying energy absorbed by the specimens less.

关 键 词：蒸压轻质混凝土 高温处理 冻融循环 应力应变关系 能量吸收 

分 类 号：TU528[建筑科学—建筑技术科学]