本文關(guān)鍵詞： 納米二氧化硅 納米碳纖維 砂漿 制備工藝 性能　出處：《大連理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：納米技術(shù)的發(fā)展為水泥基材料的可持續(xù)發(fā)展提供了新的動(dòng)力。納米材料可以在納米尺度上對(duì)水泥基材料進(jìn)行改性,既包括改善水泥基材料的力學(xué)性能也包括賦予水泥基材料功能特性。本文在納米氧化硅(NS)復(fù)合砂漿的制備工藝與性能、納米碳纖維(CNF)復(fù)合砂漿的制備工藝與性能研究的基礎(chǔ)上,探索了NS和CNF復(fù)合砂漿的性能及影響因素,主要研究?jī)?nèi)容如下：1 比較了疏水納米二氧化硅(SS)復(fù)合砂漿的機(jī)械攪拌法和研磨法制備工藝,以及親水納米二氧化硅(QS)復(fù)合砂漿的機(jī)械攪拌法、研磨法和超聲法制備工藝；制備了0.5%、1.0%、2.0%、3.0%、4.0%、5.0%摻量的SS復(fù)合砂漿和QS復(fù)合砂漿,并對(duì)復(fù)合砂漿的抗折強(qiáng)度、抗壓強(qiáng)度及微觀結(jié)構(gòu)和性能進(jìn)行了測(cè)試。研究結(jié)果表明,QS可細(xì)化氫氧化鈣、促進(jìn)水泥水化和降低氫氧化鈣的擇優(yōu)取向,適宜摻量的QS可提高砂漿的抗折強(qiáng)度和抗壓強(qiáng)度；SS對(duì)砂漿無增強(qiáng)效果。2 以砂漿3d、28d的抗折和抗壓強(qiáng)度為評(píng)價(jià)指標(biāo)確定了CNF復(fù)合砂漿的減水劑摻量和超聲時(shí)間分別為減水劑與CNF的質(zhì)量比為1和30mmin；在此基礎(chǔ)上,制備了CNF摻量為0.05%、0.10%、0.15%、0.20%、0.40%、0.60%和0.80%的復(fù)合砂漿并測(cè)試了抗折和抗壓強(qiáng)度,電阻率及微觀結(jié)構(gòu)和性能。研究結(jié)果表明,CNF可促進(jìn)水泥水化但是會(huì)提高氫氧化鈣的擇優(yōu)取向,適宜摻量的CNF可提高復(fù)合砂漿的抗折強(qiáng)度、抗壓強(qiáng)度和電導(dǎo)率。3制備了2%、3%QS分別與0.05%、0.10%和0.15%CNF復(fù)摻的砂漿并測(cè)試了抗折和抗壓強(qiáng)度以及受彎荷載下的電阻率變化規(guī)律,由于砂漿中存在較大裂紋、CNF呈現(xiàn)團(tuán)聚狀態(tài),復(fù)摻QS和CNF沒有達(dá)到單摻時(shí)的力學(xué)增強(qiáng)效果；3%QS+CNF的復(fù)合砂漿在受彎載荷下的電阻率變化率大于2%QS+CNF的復(fù)合砂漿。4通過正交試驗(yàn)分析了水膠比、砂灰比、QS摻量、CNF摻量四個(gè)因素對(duì)QS+CNF復(fù)合砂漿力學(xué)性能和電學(xué)性能的影響。研究結(jié)果表明,對(duì)力學(xué)性能影響最顯著的因素是水灰比；提高砂漿基體的密實(shí)度并綜合運(yùn)用超聲、化學(xué)分散和摻加硅灰輔助分散可制備力學(xué)性能優(yōu)異的QS+CNF復(fù)合砂漿；對(duì)電阻率影響最顯著的因素是納米碳纖維摻量;最終獲得了最佳因素水平組合。
[Abstract]:The development of nanotechnology provides a new impetus for the sustainable development of cement-based materials. Nanomaterials can modify cement-based materials at nanometer scale. It includes improving the mechanical properties of cement-based materials as well as endowing the functional properties of cement-based materials. In this paper, the preparation process and properties of nano-silica NS-based composite mortar, and the preparation technology and properties of nano-carbon fiber reinforced polymer composite mortar are studied in this paper. The properties and influencing factors of NS and CNF composite mortar were explored. The main contents of the study were as follows: 1. The preparation process of hydrophobic nano-silica composite mortar was compared by mechanical stirring method and grinding method. The mechanical agitation, grinding and ultrasonic preparation of hydrophilic nano-silica / QS composite mortar were also carried out, and the SS composite mortar and QS composite mortar were prepared, and the flexural strength of the composite mortar was also studied. The compressive strength, microstructure and properties were tested. The results show that QS can refine calcium hydroxide, promote cement hydration and reduce the preferred orientation of calcium hydroxide. The appropriate dosage of QS can improve the flexural strength and compressive strength of mortar. 2. With the flexural strength and compressive strength of CNF composite mortar as evaluation indexes, the quantity of water reducer and ultrasonic time of CNF composite mortar are determined as follows: 2. The mass ratio of water reducer to CNF is 1 and 30 min. The composite mortar of 0.20% and 0.40% and 0.40% and 0.40% of CNF was prepared, and the flexural and compressive strength, resistivity, microstructure and properties were tested. The results show that CNF can promote hydration of cement but improve the preferred orientation of calcium hydroxide. The flexural strength of composite mortar can be improved by adding appropriate amount of CNF. The compressive strength and electrical conductivity of 3QS are prepared. 3QS and 0.05% 0.10% and 0.15% respectively. The flexural and compressive strength and the change rule of resistivity under bending load are tested. Due to the existence of large cracks in mortar, CNF exhibits agglomeration. The mechanical strengthening effect of mixed QS and CNF was not achieved when the composite mortar was mixed with QS and CNF. The ratio of water to binder was analyzed by orthogonal test for composite mortar with QS CNF under flexural load. The change rate of resistivity of composite mortar was greater than 2 QS CNF, and the ratio of water to binder was analyzed by orthogonal test. The effects of four factors on the mechanical and electrical properties of QS CNF composite mortar are studied. The results show that the most significant influence factors on the mechanical properties are water-cement ratio, improving the compactness of mortar matrix and synthetically using ultrasonic, The QS CNF composite mortar with excellent mechanical properties can be prepared by chemical dispersion and silica fume assisted dispersion. The most significant factor affecting the resistivity is the content of carbon nanofibers, and the best level combination of factors is obtained.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ177.67

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本文編號(hào)：1527323