- 摘 要
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（1 上海市工程結(jié)構(gòu)新技術(shù)重點實驗室， 上海 200032； 2 上海市建筑科學(xué)研究院（集團）有限公司， 上海 200032）
［摘要］分析了混凝土在高溫下和高溫后兩階段中性化過程的機理，并通過試驗研究了經(jīng)歷兩階段中性化過程后中性化深度的變化規(guī)律。研究結(jié)果表明：混凝土在高溫下和高溫后兩階段中性化過程中的中性化機理不同，前者對后者有一定影響；經(jīng)歷兩階段中性化過程后，隨混凝土強度增加中性化深度減小幅度不斷降低；隨溫度升高，中性化深度不斷提高，但經(jīng)歷800℃高溫后混凝土再堿化程度較高，對混凝土碳化具有一定的抵抗作用；高溫后混凝土微觀結(jié)構(gòu)變化明顯，能夠反映出混凝土的中性化特征。
［關(guān)鍵詞］高溫; 混凝土; 中性化深度; 微觀結(jié)構(gòu)
中圖分類號：TU528.01 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)09-0072-03
Experimental research on neutralization mechanisms of concrete suffered from high temperature
Gao Rundong1,2, Li Xiangmin1,2, Xu Qingfeng1,2, Wang Qiong2, Yu Linfeng2
(1 Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai 200032, China; 2 Shanghai Research Institute of Building Sciences (Group), Co., Ltd., Shanghai 200032, China)
Abstract: Neutralization mechanisms on the two-stage neutralization process at high temperature and after high temperature were analyzed, and neutralization depth change regularities after the two-stage neutralization process were tested. Study results indicated: concrete neutralization mechanism at high temperature was different from that after high temperature, and the former had some effect on the latter. After the two-stage neutralization process, with concrete strength increased, the reduced amplitude of the neutralization depth was decreased. With the temperature elevated, the neutralization depth was increased, but concrete realkalisation after 800℃ could be enhanced, which would resist the carbonation to some extent. The micro-structure of concrete had obvious change after high temperature, by which the concrete neutralization features could be reflected.
Keywords: high temperature; concrete; neutralization depth; micro-structure
*上海市科委應(yīng)用技術(shù)開發(fā)項目（2011-114），上海市人才發(fā)展資金資助項目（2011058）,上海市自然科學(xué)基金資助項目（12ZR1426800）。
作者簡介：高潤東，博士，高級工程師，Email: grdong_1@163.com。
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