本文關(guān)鍵詞： 高延性水泥基復(fù)合材料 流變特性 熒光顯微分析技術(shù) 分散系數(shù) 聚乙烯醇纖維　出處：《東南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2014年05期 　論文類型：期刊論文

【摘要】：為了研究高延性水泥基復(fù)合材料(HDCC)流變特性對(duì)短切聚乙烯醇(PVA)纖維分散性的影響規(guī)律,采用流變儀和熒光顯微分析技術(shù)分別對(duì)HDCC漿體的流變特性以及短切PVA纖維在HDCC基體中的分散性進(jìn)行研究.實(shí)驗(yàn)結(jié)果表明:HDCC漿體流變行為符合赫切爾-巴爾克模型,漿體流動(dòng)后,應(yīng)變梯度隨應(yīng)力增量按冪指數(shù)增長(zhǎng);當(dāng)HDCC漿體塑性黏度為1.3~7.3 Pa·s時(shí),即使短切PVA纖維的體積摻量為1.5%~2.0%,纖維在HDCC基體中的分散系數(shù)均大于0.92,實(shí)現(xiàn)了均勻分散.合理調(diào)整配比中粉煤灰、減水劑和功能性組分的摻量,可調(diào)控HDCC漿體塑性黏度并實(shí)現(xiàn)短切PVA纖維的均勻分散,為HDCC高延性的理論設(shè)計(jì)提供實(shí)驗(yàn)支持.
[Abstract]:In order to study the effect of rheological properties of HDCCs on the dispersion of short cut polyvinyl alcohol (PVA) fibers. The rheological properties of HDCC slurry and the dispersion of short-cut PVA fiber in HDCC matrix were studied by means of rheometer and fluorescence microanalysis. The rheological behavior of HDCC slurry is in accordance with the Hech-Bark model. The strain gradient increases exponentially with the stress increment after slurry flow. When the plastic viscosity of HDCC slurry is 1.3 ~ 7.3 Pa 路s, even if the volume fraction of short cut PVA fiber is 1.5% and 2.0%. The dispersion coefficient of fiber in HDCC matrix is higher than 0.92, and the content of fly ash, water reducer and functional component is adjusted reasonably. The plastic viscosity of HDCC slurry can be regulated and the uniform dispersion of short cut PVA fiber can be realized, which provides experimental support for the theoretical design of high ductility of HDCC.
【作者單位】： 東南大學(xué)材料科學(xué)與工程學(xué)院;東南大學(xué)先進(jìn)土木工程材料協(xié)同創(chuàng)新中心;東南大學(xué)江蘇省土木工程材料重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51378113) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(26220120012)
【分類號(hào)】：TU528
【正文快照】： 高延性水泥基復(fù)合材料(HDCC)是高性能纖維增強(qiáng)水泥基復(fù)合材料中的一種.大量研究發(fā)現(xiàn),HDCC具有優(yōu)異的荷載承受能力、抗變形能力、抗剪能力和能量耗散能力[1].此外,HDCC在環(huán)境或http://journal.seu.edu.cn環(huán)境與荷載耦合作用下具有優(yōu)異的抗凍融性能[2]、抗堿硅酸鹽反應(yīng)能力[3]、，

本文編號(hào)：1445864