机制砂混凝土在冻融循环下的强度和耐久性研究  

Study on the strength and durability of concrete with manufactured-sand under condition of freeze-thaw cycle

作　　者：陈正发[1] 刘桂凤[1] 马建 

机构地区：[1]山东理工大学建筑工程学院,山东淄博255049 [2]淄博泰山建设项目管理有限公司,山东淄博255035

出　　处：《混凝土》2011年第7期79-81,84,共4页Concrete

基　　金：山东省自然科学基金项目(ZR2009FM020);国家自然科学基金项目(50709031)

摘　　要：目前,对机制砂混凝土在恶劣环境下的强度和耐久性的研究较少。在对原材料性能测试和混凝土配合比试验的基础上,对C30机制砂混凝土开展了冻融循环试验研究。对比研究了冻融循环、冻融循环后酸腐蚀和冻融循环后碱腐蚀三种情况下机制砂混凝土的质量、强度和相对动弹模量的变化规律。试验结果表明机制砂混凝土在冻融循环后质量、抗压强度和相对动弹模量都显著降低,并随冻融次数的增加降低的越多;机制砂混凝土在冻融循环后,耐酸、碱性侵蚀等的耐久性能明显减弱,且经受的冻融次数越多其耐酸、碱性侵蚀的能力越低,以耐酸侵蚀的能力最低。Nowadays, few investigated in the strength and durability of concrete with manufactured-sand in severe environment.Experiment studies on C30 concrete with manufactured-sand were carried out under condition of freeze-thaw cycle,which based on the testing of raw material performance and concrete mix ration.A comparative study on the changing laws of the mass, strength and the relative dynamic elastic modulus of concrete was made in three cases which were freeze-thaw cycle, freeze-thaw cycle and acid corrosion and freeze-thaw cycle and alkali corrosion. The results of tests indicated that the mass, strength and the relative dynamic elastic modulus of concrete with manufactured-sand decreased markedly with the increasing of times of freeze-thaw cycle.The durability of acid and alkali-resistant of concrete with manufactured-sand was also remarkably weakened due to the action of freeze-thaw cycle.The capability of acid and alkali-resistant of the concrete was weaker and weaker with the increasing of times of freeze-thaw cycle, especially the anti-acid capability.

关 键 词：机制砂混凝土 冻融循环 强度 耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]