本文選題：粉煤灰混凝土 + 碳化　； 參考：《河北農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：混凝土結(jié)構(gòu)是目前應(yīng)用最廣泛的建筑結(jié)構(gòu)形式,其耐久性能一直備受關(guān)注。針對(duì)不同的工作狀態(tài)和工作環(huán)境,混凝土?xí)l(fā)生各類耐久性損傷。單一因素造成的耐久性損傷已經(jīng)得到了各國(guó)學(xué)者廣泛的探討,而在實(shí)際工程中,混凝土損傷并非僅為某一種因素造成的,而是受到兩種或者多種因素的共同作用,且這些因素的耦合作用,不是簡(jiǎn)單的疊加,而是更為復(fù)雜的相互促進(jìn)或相互制約關(guān)系。在我國(guó)北方,尤其青藏、東北等嚴(yán)寒地區(qū)的水工混凝土,不僅受到二氧化碳的侵蝕,還遭受著極其嚴(yán)重凍融破壞,嚴(yán)重影響建筑物的使用壽命�；诖�,本文設(shè)計(jì)了具有高抗凍性能的混凝土,并進(jìn)行了碳化和凍融耦合作用下的耐久性實(shí)驗(yàn),進(jìn)一步探討嚴(yán)寒地區(qū)混凝土在碳化和凍融共同作用下的劣化過(guò)程和劣化機(jī)理。本文將我國(guó)嚴(yán)寒地區(qū)分為青藏和東北兩大類型進(jìn)行耐久性研究,針對(duì)水膠比為0.4的混凝土,按照不同的粉煤灰摻量分成五組,每組再分為四個(gè)實(shí)驗(yàn)進(jìn)行研究,包括先碳化再凍融模式(簡(jiǎn)稱CF)和先凍融再碳化模式(簡(jiǎn)稱FC)的兩個(gè)耦合試驗(yàn)以及單一碳化試驗(yàn)和單一凍融兩個(gè)對(duì)照試驗(yàn)。試驗(yàn)的測(cè)量指標(biāo)有碳化指標(biāo)(碳化深度和碳化面積)和凍融指標(biāo)(質(zhì)量損失率和相對(duì)動(dòng)彈性模量)。主要研究?jī)?nèi)容為:首先,采用快速碳化試驗(yàn),探究碳化齡期,粉煤灰摻量與混凝土碳化深度、碳化面積的關(guān)系。其次,采用快速凍融試驗(yàn),探究?jī)鋈谘h(huán)次數(shù),粉煤灰摻量與混凝土的質(zhì)量損失率、相對(duì)動(dòng)彈性模量的關(guān)系。最后,進(jìn)行碳化和凍融的耦合循環(huán)實(shí)驗(yàn),探討CF和FC模式下凍融和碳化的相互影響關(guān)系。分析結(jié)果表明:(1)在耦合實(shí)驗(yàn)和單一試驗(yàn)條下,混凝土的碳化深度、碳化面積率均隨著粉煤灰摻量的增加而增加;混凝土的質(zhì)量損失率在總體上,隨粉煤灰摻量的增加先增加后降低再增加;混凝土的相對(duì)動(dòng)彈性模量,隨粉煤灰摻量的增加先降低后增加再降低。(2)CF模式、FC模式相比單一碳化實(shí)驗(yàn)的碳化深度、碳化面積率變大,說(shuō)明CF和FC模式中的凍融破壞為碳化提供有利條件,即凍融加劇碳化。(3)CF模式、FC模式相比單一凍融實(shí)驗(yàn)的質(zhì)量損失率更大、相對(duì)動(dòng)彈性模量下降更快,說(shuō)明CF和FC模式中的碳化損傷為凍融破壞提供有利條件,即碳化加劇凍融。(4)引氣粉煤灰混凝土的抗凍能力很強(qiáng),抗碳化能力相對(duì)較弱。(5)用IPP軟件測(cè)量混凝土劈裂面碳化面積的方法,可以更準(zhǔn)確的分析凍融后混凝土的碳化規(guī)律。
[Abstract]:Concrete structure is the most widely used building structure at present, its durability has been paid much attention. According to different working state and working environment, concrete will have various durability damage. The durability damage caused by a single factor has been widely discussed by scholars all over the world. However, in practical engineering, concrete damage is caused not only by one factor, but also by two or more factors. The coupling of these factors is not a simple superposition, but a more complex mutual promotion or constraints. In northern China, especially in the cold areas of Qinghai-Tibet and Northeast China, hydraulic concrete is not only eroded by carbon dioxide, but also severely damaged by freezing and thawing, which seriously affects the service life of buildings. Based on this, the concrete with high frost resistance is designed, and the durability experiment under the coupling of carbonation and freeze-thaw is carried out, and the deterioration process and mechanism of concrete under the joint action of carbonization and freeze-thaw are discussed. In this paper, the cold regions of China are divided into two types, Qinghai-Tibet and Northeast, and the concrete with water-binder ratio 0.4 is divided into five groups according to different fly ash content, and each group is divided into four experiments. It includes two coupling tests of the first carbonization and thawing model (CFC) and the first freeze-thawing and thawing model (FCCfor short), as well as the single carbonization test and the single freeze-thaw control test. The measurement indexes include carbonation index (carbonation depth and carbonation area) and freeze-thaw index (mass loss rate and relative dynamic elastic modulus). The main contents are as follows: firstly, the relationship between carbonation age, fly ash content and carbonation depth and carbonation area of concrete was studied by rapid carbonization test. Secondly, the relationship between the number of freeze-thaw cycles, the content of fly ash and the mass loss rate of concrete and the relative dynamic modulus of elasticity is studied by using rapid freeze-thaw test. Finally, the coupling cycle experiments of carbonation and freeze-thaw were carried out to investigate the interaction between freeze-thaw and carbonization under CF and FC modes. The results show that under the coupling experiment and single test strip, the carbonation depth and carbonization area rate of concrete increase with the increase of fly ash content, and the mass loss rate of concrete is overall. With the increase of fly ash content, the relative dynamic elastic modulus of concrete firstly increases and then decreases, and then increases with the increase of fly ash content, and then decreases with the increase of fly ash content. Compared with the carbonation depth of single carbonization experiment, the carbonation area ratio of concrete increases. The results show that the freeze-thaw failure in CF and FC mode provides favorable conditions for carbonization, that is, freeze-thaw exacerbates carbonization, and the mass loss rate of CF / FC model is larger than that of single freeze-thaw experiment, and the relative dynamic modulus of elasticity decreases more rapidly than that of single freeze-thaw experiment. It shows that carbonation damage in CF and FC modes provides favorable conditions for freeze-thaw failure, that is, carbonization intensifies freezing thaw. 4) the freezing resistance of air-entrained fly ash concrete is very strong. The carbonation law of concrete after freeze-thaw can be analyzed more accurately by using IPP software to measure the carbonation area of split surface of concrete.
【學(xué)位授予單位】：河北農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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