本文選題：改性PP纖維 + 聚合物膠粉��； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：水泥砂漿因具有成本低、經(jīng)久耐用、性質(zhì)穩(wěn)定等優(yōu)勢(shì)而作為一種常見(jiàn)的水泥混凝土結(jié)構(gòu)物的粘結(jié)和修補(bǔ)材料,在建筑、橋梁、道路和其他方面應(yīng)用十分廣泛。但是在日新月異的當(dāng)代社會(huì),普通水泥砂漿已經(jīng)難以滿(mǎn)足各類(lèi)工程對(duì)其不同性能的要求。為了改善普通水泥砂漿的缺陷,如脆性大、變形能力差、抗拉和粘結(jié)強(qiáng)度較低等,更為了賦予其更豐富實(shí)用的性能,眾多學(xué)者對(duì)水泥砂漿性能的提高和改善進(jìn)行了大量研究,例如摻加不同種類(lèi)的聚合物和纖維對(duì)水泥砂漿進(jìn)行改性,都對(duì)改善和提高水泥砂漿的性能具有重要意義。本文是在此基礎(chǔ)上重點(diǎn)研究聚丙烯纖維(PP纖維)表面親水改性以及與聚合物膠粉混摻對(duì)水泥砂漿性能的影響。主要研究?jī)?nèi)容包括：(1)根據(jù)水泥砂漿的應(yīng)用場(chǎng)所確定所用的原材料；(2)利用輕質(zhì)碳酸鈣包覆PP纖維對(duì)其表面進(jìn)行親水改性,通過(guò)掃描電鏡(SEM)觀察PP纖維表面包覆的輕質(zhì)碳酸鈣顆粒的分布情況和改性PP纖維在水中的分散情況來(lái)表征改性PP纖維；(3)以水泥砂漿的力學(xué)性能為指標(biāo),通過(guò)對(duì)比試驗(yàn)確定水灰比、聚合物膠粉和PP纖維的適宜摻量,選出最佳配比；(4)在PP纖維增強(qiáng)水泥砂漿的最佳配比的基礎(chǔ)上,用改性PP纖維替換普通PP纖維,并研究改性PP纖維以及改性PP纖維與聚合物膠粉共混對(duì)水泥砂漿力學(xué)性能的影響；(5)以水泥砂漿的力學(xué)性能為指標(biāo),本文還研究了不同長(zhǎng)度的PP纖維,不同長(zhǎng)度的聚乙烯醇纖維(PVA纖維)以及不同長(zhǎng)度的兩種纖維混合對(duì)水泥砂漿力學(xué)性能的影響,并選出最佳纖維長(zhǎng)度和最佳混合纖維長(zhǎng)度,并在此基礎(chǔ)上摻加聚合物膠粉,研究不同長(zhǎng)度和不同種類(lèi)纖維與聚合物膠粉共混對(duì)水泥砂漿力學(xué)性能的影響；(6)利用SEM對(duì)水泥砂漿試樣進(jìn)行微觀分析,對(duì)比不同放大倍數(shù)的SEM照片研究水泥砂漿斷裂面的形貌、纖維的分布規(guī)律以及改性PP纖維和聚合物膠粉水泥基體的粘結(jié)形式；以此重點(diǎn)分析改性PP纖維和聚合物膠粉共混對(duì)水泥砂漿力學(xué)性能的增強(qiáng)機(jī)理。本文得到的結(jié)論有：(1)較合適的纖維和聚合物改性水泥砂漿的配比為：膠砂比為1：2,水灰比為0.30,纖維的摻量為2kg/m3,聚合物膠粉的摻量為水泥質(zhì)量的1%,減水劑的摻量為水泥質(zhì)量的1%,消泡劑的摻量為水泥質(zhì)量的1%；(2)改性后的PP纖維具有良好的親水性,能在水中均勻分散,不漂浮,不成團(tuán)；利用改性后的PP纖維替代普通的PP纖維摻入聚合物水泥砂漿中,能較明顯的改善纖維與水泥基體的粘結(jié)性能,提高水泥砂漿的抗折強(qiáng)度和韌性；(3)在一定長(zhǎng)度范圍內(nèi),建議采用長(zhǎng)為15mm的纖維；不同長(zhǎng)度的PVA纖維混合確實(shí)會(huì)對(duì)水泥砂漿的強(qiáng)度產(chǎn)生一定的影響,其中以3mm和18mm這種混合方式獲得的強(qiáng)度最高；(4)不同長(zhǎng)度的PP纖維和PVA纖維混合對(duì)水泥砂漿的強(qiáng)度有一定的影響,長(zhǎng)度為6mm的兩種纖維混合試樣各齡期的強(qiáng)度相對(duì)較高。
[Abstract]:Because of its advantages of low cost, durability and stability, cement mortar is widely used in construction, bridge, road and other fields as a common cement concrete structure bond and repair material. However, in the modern society, ordinary cement mortar has been difficult to meet the different performance requirements of various projects. In order to improve the defects of ordinary cement mortar, such as high brittleness, poor deformation ability, low tensile strength and bond strength, and more abundant and practical properties, many scholars have done a lot of research on the improvement and improvement of cement mortar performance. For example, the modification of cement mortar by adding different kinds of polymers and fibers is of great significance to improve the properties of cement mortar. In this paper, the hydrophilic modification on the surface of PP fiber and the effect of blending with polymer powder on the properties of cement mortar were studied. The main research contents include: (1) according to the application place of cement mortar, the raw material used is determined.) the surface of the cement mortar is modified with light calcium carbonate coated PP fiber. The distribution of light calcium carbonate particles coated on the surface of PP fiber and the dispersion of modified PP fiber in water were observed by scanning electron microscope (SEM). The water / cement ratio, the proper content of polymer rubber powder and PP fiber were determined by the contrast test. The optimum proportion was selected. On the basis of the optimum ratio of PP fiber reinforced cement mortar, the modified PP fiber was used to replace the common PP fiber. The effect of modified PP fiber and the blending of modified PP fiber with polymer powder on the mechanical properties of cement mortar was studied. The effects of PVA fiber of different length and two fibers of different length on the mechanical properties of cement mortar were studied. The optimum fiber length and the optimum fiber length were selected, and the polymer rubber powder was added on the basis. The effects of different lengths and kinds of fibers on the mechanical properties of cement mortar were studied. The microcosmic analysis of cement mortar samples was carried out by SEM. The morphology of fracture surface of cement mortar was studied by comparing SEM photographs with different magnification ratio. The distribution of the fibers and the bond form of the modified PP fiber and the cement based body of polymer powder were analyzed, and the mechanism of strengthening the mechanical properties of the cement mortar by blending the modified PP fiber with the polymer powder was analyzed. The results of this paper show that the ratio of fiber to polymer modified cement mortar is 1: 2, the ratio of water to cement is 0.30, the amount of fiber is 2 kg / m ~ 3, the content of polymer rubber powder is 1 / 1 of cement mass, the amount of water reducer is water, the ratio of polymer to polymer is 1: 2, the ratio of water to cement is 0.30, the content of fiber is 2 kg / m ~ (3). The modified PP fiber has good hydrophilicity, and the content of defoamer is 1 / 2 of the cement mass. The modified PP fiber can be used instead of the ordinary PP fiber in the polymer cement mortar, which can obviously improve the adhesion between the fiber and the cement base. To improve the flexural strength and toughness of cement mortar within a certain length range, it is suggested that the fiber with length of 15mm should be used, and the mixing of PVA fibers of different lengths will have a certain effect on the strength of cement mortar. The strength obtained by mixing 3mm and 18mm is the highest. (4) the mixing of PP fiber and PVA fiber of different length has certain influence on the strength of cement mortar, and the strength of the two kinds of fiber mixed with 6mm is relatively high at each age.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TQ177.62
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本文編號(hào)：1857163