本文關(guān)鍵詞：碳纖維水泥基復(fù)合材料纖維分散性及導(dǎo)電性能試驗(yàn)研究　出處：《鄭州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： CFCC 分散性 纖維表面氧化處理 粗骨料粒徑 導(dǎo)電性能

【摘要】：本課題屬鄭州市科技領(lǐng)軍人才項(xiàng)目:碳纖維智能混凝土性能研究及在結(jié)構(gòu)健康監(jiān)測中的應(yīng)用研究(131TLJRC674)。碳纖維水泥基復(fù)合材料(CFCC)是在普通水泥基材料中摻入一定量的短切碳纖維復(fù)合而成的具有機(jī)敏特性的智能材料。在CFCC的制備中,碳纖維能否均勻分散是決定CFCC導(dǎo)電性能及機(jī)敏特性能否穩(wěn)定的關(guān)鍵因素之一。此外,碳纖維的摻入會影響水泥基材料的力學(xué)性能。因此,本文主要針對碳纖維在水泥基體中的分散性、CFCC的導(dǎo)電性能及相關(guān)力學(xué)性能進(jìn)行深入的試驗(yàn)研究,以期得到分散性、導(dǎo)電性能及相關(guān)力學(xué)性能耦合良好的碳纖維水泥基復(fù)合材料。主要研究內(nèi)容包括:(1)采用新拌料漿法和硬化試件電阻測試法研究了三種分散劑(MC、CMC、HEC)及其摻量對碳纖維在水泥基體中分散性的影響,試驗(yàn)結(jié)果表明HEC分散劑對碳纖維的分散效果最好,其最佳摻量為0.6%。(2)采用兩種氧化溶劑(濃硝酸和次氯酸鈉溶液)分別對碳纖維表面進(jìn)行氧化處理,研究碳纖維表面氧化處理對碳纖維形貌、碳纖維分散性、碳纖維水泥砂漿(CFRM)內(nèi)部界面結(jié)合特性和CFRM力學(xué)性能的影響。試驗(yàn)結(jié)果表明:經(jīng)過兩種溶液氧化處理后的碳纖維表面含氧官能團(tuán)均有所增加,浸潤性均得到提高;另外,由濃硝酸處理、次氯酸鈉溶液處理、不處理三種狀態(tài)下的碳纖維制得CFRM試件中,濃硝酸處理的CFRM抗折強(qiáng)度值最大,其次是次氯酸鈉溶液。即纖維表面氧化處理一方面能提高纖維表面浸潤性及碳纖維的分散性能,另一方面能提高CFRM的抗折強(qiáng)度。(3)在碳纖維分散性研究的基礎(chǔ)上,研究了砂灰比、養(yǎng)護(hù)齡期、干濕環(huán)境等因素對CFRM導(dǎo)電性能的影響。最后研究了粗骨料最大粒徑對碳纖維混凝土(CFRC)導(dǎo)電性能和抗壓強(qiáng)度的影響,試驗(yàn)結(jié)果表明:粗骨料對導(dǎo)電性及抗壓強(qiáng)度均存在最大粒徑效應(yīng),即在粗骨料粒徑為16mm時,CFRC導(dǎo)電率及抗壓強(qiáng)度均達(dá)到最大。
[Abstract]:This project is a scientific and technological leader project in Zhengzhou City: research on the performance of carbon fiber smart concrete and its application in structural health monitoring. Carbon fiber cement matrix composites (. CFCC is a smart material with smart properties, which is composed of a certain amount of short cut carbon fiber in ordinary cement-based materials. The uniform dispersion of carbon fiber is one of the key factors to determine the stability of CFCC conductivity and cleverness. In addition, the addition of carbon fiber will affect the mechanical properties of cement-based materials. In this paper, the electrical conductivity and related mechanical properties of carbon fiber dispersion in cement matrix are studied in order to obtain the dispersion. Carbon fiber cement matrix composites with good coupling of electrical conductivity and related mechanical properties. The main research contents include: 1) three dispersants (MCs) were studied by using the new paste method and the resistance test method of hardened specimens. The effect of HEC and its content on the dispersion of carbon fiber in cement matrix was studied. The experimental results show that HEC dispersant is the best dispersant for carbon fiber. Two kinds of oxidation solvents (concentrated nitric acid and sodium hypochlorite solution) were used to oxidize the surface of carbon fiber, and the morphology of carbon fiber was studied. Carbon fiber dispersion. Effects of interfacial bonding characteristics and mechanical properties of CFRM on carbon fiber cement mortar. The experimental results show that the oxygen-containing functional groups on the surface of carbon fiber are increased after the oxidation of the two solutions. The invasiveness was improved. In addition, concentrated nitric acid treatment, sodium hypochlorite solution treatment, no treatment of three states of carbon fiber to prepare CFRM specimen, concentrated nitric acid treatment of CFRM flexural strength value is the largest. The second is sodium hypochlorite solution, that is, the oxidation treatment of fiber surface can improve the wettability of fiber surface and the dispersibility of carbon fiber on the one hand. On the other hand, it can improve the flexural strength of CFRM. The effect of dry and wet environment on the conductivity of CFRM was studied. Finally, the effect of maximum particle size of coarse aggregate on the conductivity and compressive strength of CFRC was studied. The results show that the maximum particle size effect exists on the electrical conductivity and compressive strength of coarse aggregate, that is, when the diameter of coarse aggregate is 16 mm, the conductivity and compressive strength of CFRC reach the maximum.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

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