恶劣环境下机制砂混凝土的强度和耐久性能  

Strength and Durability of Concrete with Manufactured-Sand in Severe Environment

作　　者：陈正发[1] 刘桂凤[1] 秦彦龙[1] 徐建民 

机构地区：[1]山东理工大学建筑工程学院,山东淄博255049 [2]山东凝易固砂浆科技有限公司,山东淄博255051

出　　处：《建筑材料学报》2012年第3期391-394,共4页Journal of Building Materials

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

摘　　要：在对原材料进行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高温和冻融循环试验.对比研究了冻融循环、冻融循环后酸侵蚀和碱侵蚀3种情况下机制砂混凝土强度、相对动弹模量的变化规律;对比研究了高温、高温后酸侵蚀和碱侵蚀3种情况下机制砂混凝土强度、相对动弹模量的变化规律.结果表明:在试验温度和冻融次数范围内,机制砂混凝土在高温和冻融循环后抗压强度、相对动弹模量显著降低,并随温度和冻融循环次数的增加其降低幅度有增大趋势;机制砂混凝土在高温和冻融循环后,耐酸、碱侵蚀性能明显降低,温度越高、经受的冻融循环次数越多,其耐酸、碱侵蚀能力越低,且以耐酸侵蚀能力为最低.Nowadays, few people investigated 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 high temperature and freeze-thaw cycles based on the testing of raw materials perform-ances and concrete mix proportion. Comparative studies on the changing laws of the strength and the rela-tive dynamic elastic modulus of concrete with manufactured-sand were made in some cases, including high temperature and freeze-thaw cycles, acid corrosion after high temperature and freeze-thaw cycles and alkali corrosion following high temperatures and freeze-thaw cycles. The results of tests indicate that the strength and the relative dynamic elastic modulus of concrete with manufactured-sand decreases markedly with the increase of temperature and the number of freeze-thaw cycles. The acid- and alkali-resistance of concrete with manufactured-sand is also remarkably weakened due to the action of heating and freeze-thaw cycles. The acid-and alkali-resistance, especially the acid-resistance of the concrete lowers with the in-crease of temperature and the number of freeze-thaw cycles.

关 键 词：机制砂混凝土 恶劣环境 高温 冻融循环 强度 耐久性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]