摘要
研究了矿物质对水泥砂浆及混凝土基本力学性能的影响规律,并通过快速冻融试验探讨快速冻融、腐蚀介质双重因素共同作用下混凝土力学性能劣化情况。结果表明,掺矿物质混凝土前期强度低于素混凝土,但龄期达到28 d时其活性得到发挥,到60 d时甚至超过素混凝土,弥补前期强度不足的缺陷。在快速冻融及盐水腐蚀双重因素共同作用下,掺矿物质混凝土的强度及相对动弹性模量出现不同程度降低,质量出现轻微波动,但降低或波动幅度均明显小于素混凝土,表明掺矿物质对改善混凝土结构,提升耐久性有益,而双掺的效果更佳,并给出矿物质较优掺量。
Experiments were carried out to study the effect of mineral on the basic mechanical performance of cement mortar and con- crete.Then the fast freezing - thawing tests were carried out to investigate the mechanics performance degradation of concrete under the double actions of quick freezing -thawing and corrosion medium.The results show the early strength of mixed minerals concrete is low- er than the plain concrete, but the age to 28 d when the active works, to 60d even more than the plain concrete, and it makes up the de- fects of the insufficient early strength. Under the action of fast freezing - thawing and salt water corrosion, the concrete strength, relative dynamic elastic modulus reduced in a certain degree, and concrete mass fluctuates slightly, but the reduction and fluctuation amplitude is significantly less than the plain concrete.The results show that adding minerals is beneficial to improve the microstructure and promote the durability of concrete,and the double mixing effect is better,and the optimal dosage of mineral is given.
出处
《混凝土》
CAS
北大核心
2015年第9期12-16,23,共6页
Concrete
基金
国家自然科学基金资助项目(51308120)
福建省自然科学基金资助项目(2009J05114)
校科研启动基金资助项目(GY-Z14069)
关键词
高性能混凝土
力学特性
快速冻融特性
耐久性
腐蚀介质
high performance concrete
mechanical properties
fast freezing - thawing characteristics
durability
corrosion medium
