摘要
混凝土抗压强度是衡量混凝土性能的综合指标,但目前判定混凝土冻融破坏采用的指标主要是混凝土动弹性模量,而工程中混凝土动弹性模量却无法测试,因此建立混凝土抗压强度与动弹性模量的关系对于实际工程耐久性评估具有重要的意义。通过不同水胶比、粉煤灰掺量、含气量混凝土在3.5%NaCl溶液中的快速冻融试验,测试了混凝土的动弹性模量、超声声时、抗压强度,根据测试结果建立了混凝土动弹性模量与超声声速及抗压强度之间的关系,为混凝土结构冻融损伤的评定提供了理论依据。
Compressive strength of concrete is a comprehensive index which reflects the performance of concrete,but now dynamic modulus of elasticity is the main index to judge freeze-thaw damage of concrete,and the dynamic modulus of elasticity of concrete can not be measured in ac-tual engineering,so it is of important significance for durability assessment of actual engineering to establish the relationship between dynamic modulus of elasticity and compressive strength for concrete.The accelerated freeze-thaw tests in 3.5% sodium chloride solution of the concrete with different water-binder ratio,different fly ash content and different air-entraining content were completed,in which the dynamic modulus of e-lasticity,the time of ultrasonic sound and the compressive strength of concrete were measured.According to the test result,the relationship be-tween dynamic modulus of elasticity and velocity of ultrasonic sound and the relationship between dynamic modulus of elasticity and compressive strength for concrete were established respectively,which provide theory basis for the evaluation on freeze-thaw damage of concrete structure.
出处
《混凝土》
CAS
CSCD
北大核心
2010年第4期14-16,共3页
Concrete
基金
国家自然科学基金重点项目(50538060)
国家杰出青年科学基金(50725824)
陕西省重点学科建设专项资金资助项目
关键词
混凝土
冻融
动弹性模量
超声声速
抗压强度
concrete
freeze-thaw
dynamic modulus of elasticity
velocity of ultrasonic sound
compressive strength
