884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

    肖前慧，  牛荻濤，  朱文憑
    （西安建筑科技大學(xué)，西安710055）

[摘要] 通過快速凍融的方法，對(duì)在水中經(jīng)過300次凍融循環(huán)的混凝土試件進(jìn)行了試驗(yàn)研究，測(cè)定了其在不同循環(huán)次數(shù)時(shí)的立方體抗壓強(qiáng)度。通過對(duì)試驗(yàn)結(jié)果的分析，提出了有關(guān)在凍融環(huán)境下混凝土水膠比、粉煤灰摻量和引氣劑摻量選擇的建議；并建立了考慮水膠比、粉煤灰摻量、引氣劑摻量等因素的凍融循環(huán)下混凝土抗壓強(qiáng)度指數(shù)衰減規(guī)律預(yù)測(cè)模型和壽命預(yù)測(cè)模型，這些模型為混凝土在凍融環(huán)境下耐久性壽命預(yù)測(cè)提供了依據(jù)，也為有抗凍要求混凝土結(jié)構(gòu)的進(jìn)一步研究提供了試驗(yàn)依據(jù)和參考。
[關(guān)鍵詞] 混凝土；凍融環(huán)境；耐久壽命；預(yù)測(cè)模型
中圖分類號(hào)：TU528    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2011) S2-0203-05

    Strength degradation model and durability service life prediction of concrete in freezing-thawing circumstance
    Xiao Qianhui, Niu Ditao, Zhu Wenping
    ( Xi' an University of Arclutecture and Technology,  Xi' an 710055,  China)

Abstract: The experimental study on concrete specimens suffering 300 cycles of freezing and thawing was carried out. The compressive strength of concrete was measured, and suggestions of selecting the water-cement ratio, the air-entraining agents and the fly ash contents of concrete were introduced.  The testing results were discussed and the prediction model of freezing and thawing cycles of concrete was built, considering the water-cement ratio, the fly ash contents and the air-entraining agents, which choose the compressive strength as the evaluation index. The prediction model can provide the testing and theoretic basis for the prediction of durability service life of common concrete in freezing-thawing circumstance and the deeper study of the concrete construction in freezing-thawing circumstance.
Keywords: concrete; freezing-thawing circumstance; durable life; prediction model