【摘要】：青海鹽湖地區(qū)由于其特殊的地理環(huán)境,使得當(dāng)?shù)氐慕ㄖ锝Y(jié)構(gòu)因季節(jié)性的凍融循環(huán)和氯離子侵蝕遭受嚴(yán)重的損害。凍融循環(huán)及氯離子侵蝕相互促進(jìn),相互遞進(jìn),致使鹽湖及其周邊混凝土結(jié)構(gòu)因腐蝕破壞而壽命縮短。因此,提高鹽湖地區(qū)混凝土結(jié)構(gòu)耐久性的問題迫在眉睫。本文嘗試研制一種抗氯離子侵蝕的水泥基灌漿料作為防腐材料,從而有效保護(hù)混凝土抵抗氯離子侵蝕及凍融破壞,提高混凝土結(jié)構(gòu)的耐久性。本文從水泥基灌漿料的材料選取、配合比設(shè)計(jì)和耐久性方面進(jìn)行系統(tǒng)的研究,分析及優(yōu)化了各因素對(duì)灌漿料性能的影響,取得了一定的成果,對(duì)今后工程的實(shí)際應(yīng)用及研究具有十分重要的意義。論文的主要研究?jī)?nèi)容及成果如下:(1)采用正交法研究了水膠比、膠砂比、硅灰、粉煤灰、膨脹劑及減水劑對(duì)水泥基灌漿料流動(dòng)性及強(qiáng)度的影響,獲得了對(duì)灌漿料性能影響顯著的因素,初步優(yōu)化灌漿料配合比參數(shù)。(2)通過(guò)單一變量試驗(yàn),深入分析研究水膠比、膠砂比、硅灰、粉煤灰及減水劑對(duì)水泥基灌漿料抗壓及抗折強(qiáng)度的影響,進(jìn)一步優(yōu)化配合比參數(shù),獲得了物理力學(xué)性能較好的水泥基灌漿料;另外,通過(guò)摻加適量的消泡劑不僅改善了灌漿料的表面性質(zhì),又提高了灌漿料的強(qiáng)度,取得了良好的改性效果。(3)進(jìn)行了水泥基灌漿料在10%、15%和20%三種濃度的鹽溶液中抗凍融循環(huán)試驗(yàn)。試驗(yàn)結(jié)果表明,灌漿料強(qiáng)度及質(zhì)量隨凍融循環(huán)次數(shù)的增加先增加后降低;在15%鹽溶液中的灌漿料強(qiáng)度及質(zhì)量損失率較大,而20%的高濃度鹽溶液有效降低了冰點(diǎn),有利于試件的抗凍,但試件在鹽溶液中凍融的損失均比在水中的嚴(yán)重。(4)研究了水泥基灌漿料試件在10%、15%和20%三種濃度的鹽溶液中長(zhǎng)期浸泡試驗(yàn)。結(jié)果表明,試件強(qiáng)度耐蝕系數(shù)隨浸泡時(shí)間的增加先增加后降低;隨鹽溶液濃度的增加不斷降低。在20%鹽溶液中浸泡9個(gè)月的試件的氯離子侵蝕深度為3.20,且侵蝕速率明顯降低,說(shuō)明灌漿料具有良好的抗氯離子侵蝕性能。
[Abstract]:Due to its special geographical environment, the local building structure is seriously damaged by seasonal freeze-thaw cycle and chloride ion erosion. The freeze-thaw cycle and chloride erosion promote each other, which results in the shortening of the life of the concrete structure of salt lake and its surrounding area due to corrosion damage. Therefore, it is urgent to improve the durability of concrete structure in salt lake area. This paper attempts to develop a kind of cement based grouting material which is resistant to chloride ion erosion as anticorrosive material so as to effectively protect concrete against chloride ion erosion and freeze-thaw damage and improve the durability of concrete structure. In this paper, the material selection, mix ratio design and durability of cement-based grouting materials are systematically studied, and the effects of various factors on the performance of grouting materials are analyzed and optimized, and some achievements are obtained. It is of great significance to the practical application and research of the future engineering. The main research contents and results are as follows: (1) the effects of water-binder ratio, cement-sand ratio, silica fume, fly ash, expander and water reducer on the fluidity and strength of cement based grouting were studied by orthogonal method. The factors influencing the performance of the grouting material were obtained, and the mixing ratio parameters of the grouting material were preliminarily optimized. (2) through the single variable test, the water binder ratio, the cement-sand ratio, the silica fume ratio, the water-binder ratio, the cement-sand ratio, the silica fume ratio, The effects of fly ash and water reducer on compressive and flexural strength of cement based grouting materials were studied. In addition, the addition of proper amount of defoamer not only improves the surface properties of the grouting material, but also improves the strength of the grouting material. Freezing and thawing resistance test in salt solution of 15% and 20%. The results showed that the strength and quality of grouting materials increased firstly and then decreased with the increase of freeze-thaw cycles. The strength and mass loss rate of the grouting material in 15% salt solution is large, while 20% high concentration salt solution can effectively reduce the freezing point, which is beneficial to the freezing resistance of the sample. But the loss of freezing and thawing in salt solution was more serious than that in water. (4) the long-term soaking test of cement based grouting material in 10% and 20% salt solution was studied. The results show that the corrosion resistance coefficient of the specimen increases first and then decreases with the increase of soaking time, and decreases with the increase of salt concentration. The chloride erosion depth of the sample soaked in 20% salt solution for 9 months was 3.20, and the erosion rate was obviously decreased, which indicated that the grouting material had good resistance to chloride ion erosion.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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