【摘要】：目前在全球范圍內(nèi)混凝土耐久性的研究已經(jīng)取得了豐碩的果實(shí),但是也存在有一些研究的盲區(qū),例如缺少多因素復(fù)合作用下混凝土耐久性的試驗(yàn)方法、劣化模型以及防治措施等。我國(guó)幅員遼闊鹽堿、鹽湖地區(qū)也相當(dāng)廣闊,特別是北方的鹽堿地區(qū)氣候比較惡劣,這些地區(qū)的水工建筑的劣化大部分都是雙因素甚至多因素作用的結(jié)果,然而我國(guó)對(duì)于多重因素的混凝土耐久性研究較少。 本文針對(duì)以上問(wèn)題進(jìn)行了硫酸鹽侵蝕與凍融循環(huán)雙重因素的混凝土的劣化模型的分析。采用了硫酸鹽侵蝕后凍融循環(huán)、凍融循環(huán)后硫酸鹽侵蝕與硫酸鹽侵蝕-凍融循環(huán)交替三種混凝土劣化模型分析了劣化的規(guī)律,采用相對(duì)動(dòng)彈性模量和質(zhì)量損失率作為試驗(yàn)分析的評(píng)價(jià)指標(biāo),并且引用損傷疊加效應(yīng)系數(shù)k得出了三種劣化模型加速劣化效果。 通過(guò)本試驗(yàn)分析得出,當(dāng)硫酸鈉溶液的濃度大于4.7%,鹽凍除了有凍融破壞之外,還有硫酸鹽結(jié)晶析出對(duì)混凝土造成的物理破壞；通過(guò)前期的分析和疊加效應(yīng)系數(shù)的分析認(rèn)為硫酸鹽侵蝕與凍融循環(huán)雙因素作用不是簡(jiǎn)單的相互疊加的效應(yīng),而是1+12的超疊加效應(yīng),這兩種破壞是相互促進(jìn),相互影響；硫酸鹽侵蝕與凍融循環(huán)的超疊加效應(yīng)可能是因?yàn)榍捌诋a(chǎn)生的細(xì)微網(wǎng)狀裂紋,加速了溶液的滲入,導(dǎo)致了雙因素作用的混凝土劣化的加速；硫酸鹽侵蝕-凍融循環(huán)交替的劣化速度大于硫酸鹽侵蝕后凍融循環(huán)和凍融循環(huán)后硫酸鹽侵蝕。
[Abstract]:At present, the research on durability of concrete in the world has achieved rich fruits, but there are also some blind areas, such as the lack of multi-factor composite test method for durability of concrete. Deterioration model and prevention measures. China has a vast territory of salt and alkali, and the salt lake area is also quite broad, especially in the northern saline-alkali areas. The deterioration of hydraulic structures in these areas is mostly the result of the action of double factors or even multi-factors. However, there is little research on durability of concrete with multiple factors in our country. In this paper, the deterioration model of concrete with sulfate erosion and freeze-thaw cycle is analyzed. Three kinds of deterioration models of concrete such as freezing-thawing cycle after sulfate erosion, sulfate erosion and sulfate erosion-freeze-thaw cycle alternation after freezing-thawing cycle were used to analyze the deterioration rule. The relative dynamic elastic modulus and mass loss rate are used as the evaluation indexes for the experimental analysis, and the accelerated deterioration effects of three degradation models are obtained by using the damage superposition effect coefficient k. According to the analysis of this experiment, when the concentration of sodium sulfate solution is more than 4.7%, there is not only freeze-thaw damage, but also physical damage caused by sulfate crystallization precipitation. Through the previous analysis and the analysis of superposition effect coefficient, it is concluded that sulfate erosion and freezing-thawing cycle double-factor action is not a simple superposition effect, but a super-superposition effect of 112. These two kinds of damage are mutual promotion and mutual influence. The supersuperposition effect of sulfate erosion and freeze-thaw cycle may be due to the micro-reticulated cracks produced in the early stage, which accelerate the infiltration of the solution and lead to the acceleration of deterioration of the concrete under the action of double factors. The degradation rate of sulfate-freeze-thaw cycle is higher than that of freeze-thaw cycle after sulfate erosion and sulfate erosion after freezing-thawing cycle.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU528

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