本文關(guān)鍵詞： PVA-ECC 硅烷偶聯(lián)劑 表面活性劑 高韌性 高阻尼　出處：《南京工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：超高韌性水泥基復(fù)合材料(PVA-ECC)是近年來發(fā)明的一種新型的、優(yōu)秀的纖維增強(qiáng)水泥基復(fù)合材料。它超強(qiáng)的韌性、獨(dú)特的多縫開裂特性、應(yīng)變硬化特性、豐富的產(chǎn)品種類以及突出的綠色環(huán)保性,不但可以顯著改善混凝土結(jié)構(gòu)的抗震性能和抗彎性能,實(shí)現(xiàn)建筑結(jié)構(gòu)的自身耗能,而且具有很好的可持續(xù)發(fā)展意義。本文介紹了PVA-ECC的制備工藝,并從纖維摻量、水膠比、硅烷偶聯(lián)劑、纖維長徑比對(duì)PVA-ECC的影響出發(fā),對(duì)其力學(xué)性能以及阻尼性能進(jìn)行了研究,具體內(nèi)容如下：(1)通過閱讀文獻(xiàn),確定PVA-ECC的初始配合比,通過纖維分散情況、力學(xué)性能以及阻尼性能的反復(fù)試驗(yàn),不斷調(diào)整配合比,研發(fā)出一種高韌性高阻尼的新型復(fù)合水泥基材料。(2)本文為了改善纖維在水泥基體中分散情況,在基體中加入了表面活性劑,試驗(yàn)結(jié)果表明：加入表面活性劑有助于改善纖維在基體中的分散情況。(3)本文對(duì)PVA-ECC進(jìn)行了小梁的四點(diǎn)彎曲試驗(yàn),探究了其彎曲變形的能力。試驗(yàn)結(jié)果表明：在基體中摻入PVA纖維可以明顯提高材料的強(qiáng)度和韌性,且PVA纖維摻量越高提高效果越好；提高水膠比可以增大材料的韌性但是會(huì)降低其強(qiáng)度；將纖維表面用硅烷偶聯(lián)劑處理后可以增大材料的韌性和強(qiáng)度；纖維長度對(duì)PVA-ECC的韌性也有一定的影響,長纖維效果更優(yōu)。(4)本文對(duì)PVA-ECC進(jìn)行了軸向拉伸試驗(yàn),研究表明：增大纖維摻量、提高水膠比、添加硅烷偶聯(lián)劑以及增大纖維長徑比均可以增大材料的延性,最大拉伸應(yīng)變達(dá)到2.8%；PVA-ECC的拉伸彈性模量低于純基體混凝土,說明它剛度變小韌性變大,通過其變形來釋放更多能量；在拉伸過程中出現(xiàn)了應(yīng)變硬化和多縫開裂兩大特征。(5)本文對(duì)PVA-ECC進(jìn)行了阻尼比試驗(yàn),并總結(jié)了幾種主要的耗能途徑。試驗(yàn)結(jié)果表明：增大纖維摻量、提高水膠比、添加硅烷偶聯(lián)劑、纖維長徑比均可以提高材料的阻尼性能,最大阻尼比可達(dá)到7.5%。
[Abstract]:Ultrahigh toughness cement matrix composites PVA-ECCs are a new and excellent fiber reinforced cement matrix composites developed in recent years. Strain hardening characteristics, rich product types and outstanding green environmental protection can not only significantly improve the seismic and flexural properties of concrete structures, but also achieve the energy consumption of building structures. In this paper, the preparation process of PVA-ECC is introduced, and the effects of fiber content, water / binder ratio, silane coupling agent and fiber aspect ratio on PVA-ECC are introduced. The mechanical properties and damping properties of PVA-ECC are studied. The main contents are as follows: 1) by reading the literature, the initial blending ratio and fiber dispersion of PVA-ECC are determined. In order to improve the dispersion of fiber in cement matrix, a new composite cement-based material with high toughness and high damping has been developed through repeated tests of mechanical properties and damping properties. The experimental results show that the addition of surfactant helps to improve the dispersion of fibers in the matrix.) in this paper, the four-point bending test of PVA-ECC trabeculae was carried out. The results show that the strength and toughness of the material can be improved obviously by adding PVA fiber into the matrix, and the higher the content of PVA fiber is, the better the effect is. Increasing the water-binder ratio can increase the toughness of the material but reduce its strength. After the fiber surface was treated with silane coupling agent, the toughness and strength of the material could be increased. Fiber length also has a certain effect on the toughness of PVA-ECC. The effect of long fiber is better. 4) in this paper, the axial tensile test of PVA-ECC is carried out. The results show that: increase the content of fiber. The ductility of the material can be increased by increasing the water-binder ratio, adding silane coupling agent and increasing the fiber aspect ratio, and the maximum tensile strain reaches 2.8%. The tensile elastic modulus of PVA-ECC is lower than that of pure matrix concrete, which indicates that its stiffness becomes smaller and its toughness becomes larger, which releases more energy through its deformation. Strain hardening and multi-crack cracking appeared in the tensile process.) the damping ratio test of PVA-ECC was carried out in this paper. The experimental results show that increasing the fiber content, increasing the water / binder ratio, adding silane coupling agent and fiber aspect ratio can improve the damping property of the material. The maximum damping ratio can reach 7.5.
【學(xué)位授予單位】：南京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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