本文選題：灌漿修補 + 水下混凝土裂縫��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：混凝土材料因自身抗拉強度低，溫差，收縮，堿集料反應(yīng)等等原因，在生產(chǎn)和使用過程中很容易產(chǎn)生裂縫。一旦產(chǎn)生裂縫，在影響外觀同時，如果裂縫過大將對結(jié)構(gòu)的安全性造成損害。灌漿法作為一種全面修復(fù)技術(shù)，其先進修補的原理和優(yōu)異的效果使其成為了國內(nèi)外混凝土裂縫修補的重要手段。但是對于水下混凝土裂縫，因自身的飽水環(huán)境，要求灌漿材料具備水下抗分散等性能，這使的普通的水泥基灌漿材料遇到了瓶頸。 本文以水下混凝土和水下砂漿為基礎(chǔ)，使用我國常用的聚丙烯酰胺類和纖維素類兩種絮凝劑，根據(jù)水下裂縫特殊環(huán)境的要求，配制能在動水情況下使用的水泥基灌漿材料，并在實驗室模擬動水情況下的裂縫灌漿。通過對此種類型水泥基灌漿材料的研究，為實際工程的水下混凝土裂縫灌漿提供參考。試驗結(jié)果表明： ①聚丙烯酰胺和羥丙基甲基纖維素兩類絮凝劑，通過架橋作用和電荷中和作用能使水泥漿液達到水下不分散的性能； ②聚丙烯酰胺類絮凝劑加入水泥漿液后，漿液的流動度將整體出現(xiàn)減小，但隨其摻量的增大，漿液流動度出現(xiàn)先增大后減小的變化，，出現(xiàn)“臨界點”。分子量越大的聚丙烯酰胺抗分散作用越強，但是對漿液的流動度越不利； ③羥丙基甲基纖維素同樣會導(dǎo)致水泥漿流動度減小，同時自身具有引氣作用，導(dǎo)致漿體硬化后內(nèi)外產(chǎn)生大量孔洞，降低強度。漿液堿（NaOH）含量的增加將破壞此類絮凝劑抗分散效果； ④最終水泥基灌漿材料Z組配合比具有流動性大，動水不分散，能很好的填充寬大的裂縫，達到理想的修補效果，最后形成的灌注體具備較高的早期和后期強度。
[Abstract]:Because of its low tensile strength, temperature difference, shrinkage, alkali aggregate reaction and other reasons, concrete materials are easy to produce cracks in the process of production and use. Once a crack is produced, the safety of the structure will be damaged if the crack is too large at the same time as affecting the appearance. Grouting as a comprehensive repair technology, its advanced repair principle and excellent effect make it become an important means of repairing concrete cracks at home and abroad. However, for underwater concrete cracks, due to their saturated water environment, grouting materials are required to have underwater anti-dispersion and other properties, which makes the common cement-based grouting materials meet the bottleneck. Based on underwater concrete and underwater mortar, two kinds of flocculants, polyacrylamide and cellulose, which are commonly used in China, are used in this paper. According to the special environment requirements of underwater cracks, cement based grouting materials which can be used in dynamic conditions are prepared. The crack grouting is simulated in the laboratory under the condition of dynamic water. Through the study of this kind of cement-based grouting material, this paper provides a reference for underwater concrete crack grouting. The results show that: (1) two kinds of flocculants, polyacrylamide and hydroxypropyl methyl cellulose, can make the cement slurry underwater non-dispersible by bridging action and charge neutralization action; (2) when the polyacrylamide flocculant is added into the cement slurry, the fluidity of the slurry will decrease as a whole, but with the increase of its content, the fluidity of the slurry will increase first and then decrease, and the "critical point" will appear. The larger the molecular weight of polyacrylamide is, the stronger the anti-dispersion effect is, but the more unfavorable to the flow degree of the slurry, 3 hydroxypropyl methyl cellulose also leads to a decrease in the fluidity of the cement slurry, and it also has an air entraining effect on itself. After hardening, a large number of holes are produced inside and outside of the slurry, and the strength is reduced. The increase of sodium hydroxide (NaOH) content will destroy the anti-dispersion effect of this kind of flocculant. To achieve the ideal repair effect, the resulting perfusion has high early and late strength.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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本文編號：2110606