大掺量粉煤灰混凝土在海水中冻融循环后的试验研究  

Concrete Experimental research on the freezing-thawing circle of high volume fly ash concrete in seawater

作　　者：覃丽坤[1] 宋宏伟[1] 王秀伟[1] 

机构地区：[1]大连民族学院土木建筑工程学院,辽宁大连116650

出　　处：《混凝土》2014年第9期12-14,18,共4页Concrete

基　　金：国家住房和城乡建设部科研基金项目(2011-k2-14);中央高校基本科研业务专项资金资助项目(DC12010110)

摘　　要：为研究粉煤灰混凝土的抗冻性能,研究了水胶比为0.35,粉煤灰掺量为52%的大掺量粉煤灰混凝土在海水中的抗冻性能,利用混凝土快速冻融试验机,对海水中粉煤灰混凝土分别进行了0、100、200、300、400次快速冻融循环试验,并对冻融循环后的混凝土进行了单轴压力学性能试验。测得了冻融循环后混凝土的质量损失,动弹性模量以及单轴抗压强度。根据试验结果,系统地分析了冻融循环次数对大掺量粉煤灰混凝土单轴抗压强度的影响。结论表明:随冻融循环次数的增加,海水中大掺量粉煤灰混凝土的单轴强度逐渐降低,并具有一定规律性。这些结论可以为粉煤灰混凝土在寒冷地区海工混凝土构筑物的应用提供理论依据。In order to study on frost resistance of fly ash concrete.The authors using the rapid freezing and thawing of concrete test machine,tested the frost resistance performance of high volume fly ash concrete in seawater,whose water-binder ratio was 0.35,the amount of fly ash was 52%.The fast freezing-thawing test was carried on 0、100、200、300 and 400 cycles,then uniaxial compression test,the mass loss after freezing-thawing cycles,the dynamic elastic modulus and uniaxial compressive strength were tested.According to the test results,the systematic analysis of the influence of freezing-thawing cycles on the uniaxial compressive strength of high volume fly ash concrete.Conclusion：with the increase in the number of freezing-thawing cycles,the uniaxial strength mixed with high volume fly ash concrete in seawater decreased gradually,and which has certain regularity.These conclusions can provide a theoretical basis for the application of fly ash concrete in cold area of marine concrete qstructures.

关 键 词：粉煤灰 混凝土 海水 冻融循环 试验研究 

分 类 号：TU528.01[建筑科学—建筑技术科学]