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（中鐵十一局集團(tuán)城市軌道工程有限公司， 武漢 430074）
［摘要］設(shè)計(jì)和加工了一個能精確控制裂縫寬度的裝置，利用此裝置采用兩次加載的方法，制備了平均裂縫寬度分別為0.1mm、0.2mm、0.3mm、0.4mm的開裂混凝土試件。在無風(fēng)潮濕、無風(fēng)干燥、有風(fēng)干燥和有風(fēng)潮濕四種環(huán)境下進(jìn)行開裂混凝土快速碳化試驗(yàn)研究，結(jié)果表明，無風(fēng)潮濕環(huán)境下CO2在開裂混凝土中傳輸速率最大；有風(fēng)干燥環(huán)境下開裂混凝土碳化較慢。裂縫寬度限制應(yīng)根據(jù)環(huán)境來選擇，潮濕環(huán)境下裂縫寬度控制應(yīng)更加嚴(yán)格；大風(fēng)干旱環(huán)境下裂縫寬度限值可以適當(dāng)放寬。
［關(guān)鍵詞］風(fēng)； 相對濕度； 裂縫寬度； 混凝土碳化
中圖分類號： TU528.01 文獻(xiàn)識碼： A文章編號： 1002-848X(2016)S1-0665-07
Experimental research on the influence of crack width on carbonation of concrete under
wind and humidity environment condition
Ouyang Wei
(China Railway 11th Bureau Group Co., Ltd., Wuhan 430074, China)
Abstract: A device that could precisely control the crack width of concrete was designed and made. The cracked concrete samples with average crack widths of 0.1mm, 0.2mm, 0.3mm, and 0.4mm, respectively, were prepared by the method of loading two times by means of this device. The accelerated carbonation experiment of the cracked concrete samples under the four kinds of environment conditions such as windless and wet, windless and dry, windy and dry, and windy and wet environment condition was done. The experiment results show that, under the windless and wet environment condition the transmission rate of CO2 in the cracked concrete is the greatest among the four kinds of environment conditions, and the rate of carbonation in the cracked concrete was slow down by the wind under the dry environment condition, so restricting crack width should be chosen according to the environment, under the wet environment condition the crack width should be strictly controlled, and under windy and wet environment condition the limit value of crack width could be relaxed appropriately.
Keywords: wind; relative humidity; crack width; carbonation of concrete
作者簡介： 歐陽威，碩士，助理工程師， Email：bjouyangwei@sina.com。
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