本文選題：耐久性 + PVA纖維　； 參考：《河北工業(yè)大學(xué)》2014年碩士論文

【摘要】：近年來(lái)，隨著人們對(duì)高性能混凝土越來(lái)越重視，纖維混凝土的研究也進(jìn)入了快速發(fā)展的階段。本文配制的聚乙烯醇（polyvinyl alcohol，簡(jiǎn)稱PVA）纖維水泥基復(fù)合材料是一種性能卓越的復(fù)合材料，具有應(yīng)變硬化和多縫開(kāi)裂的特征。近二十年來(lái)，國(guó)內(nèi)外對(duì)纖維增強(qiáng)水泥基復(fù)合材料的性能做了大量研究工作，并嘗試在道路工程中應(yīng)用，相關(guān)研究集中在理論分析、力學(xué)性能和收縮開(kāi)裂上，而對(duì)耐久性的研究相對(duì)較少。 本文主要研究水膠比、粉煤灰摻量、硅粉摻量和PVA纖維摻量對(duì)復(fù)合材料抗凍性和抗擴(kuò)散性的影響。采用單面鹽凍試驗(yàn)法，測(cè)定單位面積質(zhì)量損失和超聲波相對(duì)動(dòng)彈性模量損失率分析PVA增強(qiáng)水泥基復(fù)合材料的抗凍性能；采用快速氯離子遷移試驗(yàn)方法，測(cè)定擴(kuò)散系數(shù)分析PVA增強(qiáng)水泥基復(fù)合材料的抗氯離子擴(kuò)散性能。主要研究結(jié)論如下： 1.水膠比影響PVA增強(qiáng)水泥基復(fù)合材料內(nèi)部孔隙率、孔直徑、和孔隙間距，改變了內(nèi)部的孔結(jié)構(gòu)特征，水膠比為0.27~0.4之間時(shí)制備的PVA增強(qiáng)水泥基復(fù)合材料,隨著水膠比的增加抗凍性能和抗擴(kuò)散性能下降； 2.粉煤灰填充了PVA增強(qiáng)水泥基復(fù)合材料內(nèi)部缺陷，使結(jié)構(gòu)更密實(shí)、孔徑細(xì)化。試驗(yàn)測(cè)試了FA摻量40%~50%PVA增強(qiáng)水泥基復(fù)合材料抗凍融剝落性能，結(jié)果顯示當(dāng)粉煤灰摻量在45%~50%之間時(shí)，具有較強(qiáng)的抗凍性和抗擴(kuò)散性； 3.PVA纖維具有較強(qiáng)和水泥基體結(jié)合能力、較高的彈性模量，均勻分散的PVA纖維有效地阻止了水泥基復(fù)合材料的裂縫的擴(kuò)展，，PVA纖維摻量在1.5%~2%之間時(shí)，PVA纖維增強(qiáng)水泥基復(fù)合材料的抗凍性能和抗擴(kuò)散性能優(yōu)于不加入纖維的水泥基復(fù)合材料； 4.硅粉的填充效應(yīng)和火山灰效應(yīng)，使PVA增強(qiáng)水泥基復(fù)合材料結(jié)構(gòu)更為致密，孔隙尺寸得以減小，阻止了毛細(xì)孔的連通。硅粉的摻入量為5%~20%，水泥基復(fù)合材料的抗擴(kuò)散性提高。 本文研究對(duì)于正確評(píng)價(jià)道路混凝土在有除冰鹽環(huán)境下的抗凍性和抗擴(kuò)散性，解決寒冷地區(qū)路面混凝土鹽凍破壞的實(shí)際問(wèn)題具有重要的現(xiàn)實(shí)意義和廣闊的工程應(yīng)用前景。
[Abstract]:In recent years, as people pay more and more attention to high performance concrete, the research of fiber reinforced concrete has entered a stage of rapid development. The polyvinyl alcohol (PVA) fiber cement matrix composite prepared in this paper is a kind of composite with excellent properties, which has the characteristics of strain hardening and multi-joint cracking. In the past two decades, a great deal of research work has been done on the properties of fiber reinforced cement matrix composites, and they have tried to be applied in road engineering. The related research focuses on theoretical analysis, mechanical properties and shrinkage cracking. However, the research on durability is relatively few. In this paper, the effects of water / binder ratio, fly ash content, silica content and PVA fiber content on the frost resistance and diffusion resistance of composites were studied. The freezing resistance of PVA reinforced cement matrix composites was analyzed by single side salt freezing test, the mass loss per unit area and the loss rate of ultrasonic relative dynamic modulus of elasticity, and the fast chlorine ion migration test method was used. The diffusion resistance of PVA reinforced cement matrix composites was analyzed by measuring diffusion coefficient. The main findings are as follows: 1. The water / binder ratio affects the internal porosity, pore diameter and pore spacing of PVA reinforced cement matrix composites, and changes the internal pore structure characteristics. When the water / binder ratio is between 0. 27 and 0. 4, the PVA reinforced cement matrix composites are prepared. With the increase of water-binder ratio, the frost resistance and diffusion resistance decreased. 2. Fly ash filled PVA reinforced cement matrix composites with internal defects, making the structure more compact and the pore size refined. The freezing and thawing resistance of cement matrix composites reinforced with FA 40%~50%PVA was tested. The results showed that when the content of fly ash was between 45% and 50%, it had strong frost resistance and diffusion resistance. 3.PVA fiber has strong bonding ability with cement matrix and high elastic modulus. The uniformly dispersed PVA fiber can effectively prevent the crack propagation of cement matrix composites. When the content of PVA fiber is between 1.5% and 2%, the freezing resistance and diffusion resistance of PVA fiber reinforced cement matrix composites are better than that of cement matrix composites without fiber addition. 4. The filling effect of silica powder and the pozzolanic effect make the structure of PVA reinforced cement matrix composites more compact and the pore size decrease, thus preventing the capillary from connecting. The diffusion resistance of cement-based composites is improved by the addition of silica fume to 5% and 20% respectively. The research in this paper has important practical significance and broad engineering application prospect for correctly evaluating the frost resistance and diffusion resistance of road concrete in the environment of deicing salt and solving the actual problem of salt freezing damage of pavement concrete in cold area.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528.572

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本文編號(hào)：1813131