复杂环境作用下粉煤灰混凝土碳化性能试验研究  

Experimental study on carbonation behavior of fly ash concrete under complex environment

作　　者：武允超[1] WU Yunchao(Anhui & Huaihe River Institute of Hydraulic Research,Bengbu 233000,China)

机构地区：[1]安徽省水利科学研究院

出　　处：《江西水利科技》2019年第3期157-162,共6页Jiangxi Hydraulic Science & Technology

摘　　要：为了探究粉煤灰混凝土在多种因素共同影响下的碳化性能,对0%、10%、20%、30%四种粉煤灰掺量下的混凝土分别进行单一冻融循环、单一干湿循环以及冻融-干湿循环作用下的碳化试验.研究结果表明:随着循环次数的增加,碳化深度呈幂函数增长;相同环境下,粉煤灰掺量越大,碳化深度也越大;随着碳化龄期的增加,碳化深度呈逐渐增大趋势;相同碳化龄期(7d、14d、21d、28d)和粉煤灰掺量(0%、10%、20%、30%)情况下,冻融-干湿-碳化深度>冻融-碳化深度>干湿-碳化深度;根据试验结果,建立了粉煤灰混凝土碳化模型,可较好模拟不同环境、粉煤灰掺量以及碳化时间下的碳化深度,可为工程实践提供帮助.In order to explore the carbonation performance of fly ash concrete under the influence of various factors, the carbonation tests of concrete with 0%,10%,20% and 30% fly ash were carried out under the action of single freeze -thaw cycle,single dry -wet cycle and freeze -thaw -dry -wet cycle respectively. The results show that the carbonization depth increases exponentially with the increase of cycle times;under the same environment,the higher the fly ash content,the greater the carbonization depth;with the increase of age,the carbonization depth increases gradually;under the same age(7d,14d,21d,28d)and fly ash content (0%,10%,20%,30%),the freezethaw- dry-wet-carbonization depth > freeze-thaw-carbonization depth. According to the test results,the carbonation model of fly ash concrete is established,which can simulate the carbonation depth of fly ash in different environments, fly ash content and carbonation time,and can provide help for engineering practice.

关 键 词：冻融循环 干湿循环 冻融-干湿循环 粉煤灰混凝土 碳化性能 模型 

分 类 号：TU311.2[建筑科学—结构工程]