本文關(guān)鍵詞：可噴射PVA纖維增強(qiáng)水泥基復(fù)合材料基本性能試驗(yàn)研究　出處：《廣西大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： PVA-ECC 噴射施工 基本力學(xué)性能 耐久性 摻合料復(fù)摻

【摘要】：PVA-ECC(Engineered cementitious composites,簡(jiǎn)稱ECC),是近年來(lái)發(fā)展較快的一種以PVA(聚乙烯醇)纖維作為增強(qiáng)纖維的超高韌性水泥基復(fù)合材料。因其具有多縫開(kāi)裂和顯著的應(yīng)變-硬化現(xiàn)象等傳統(tǒng)水泥基材料所不具備的諸多優(yōu)良性能,在國(guó)內(nèi)外逐漸引起廣泛關(guān)注。目前,對(duì)PVA-ECC的研究和應(yīng)用大多集中在普通澆筑工作性能下,對(duì)其具有噴射施工性能時(shí)的相關(guān)研究較少。本文結(jié)合現(xiàn)有普通PVA-ECC的研究成果,對(duì)具備可噴射工作性能的PVA-ECC進(jìn)行了初步探索和研究,主要工作內(nèi)容和研究成果如下： (1)通過(guò)拌合物工作性能試驗(yàn),研究了不同摻合料和摻量對(duì)工作性能的影響規(guī)律。研究結(jié)果表明：?jiǎn)螕?0%粉煤灰或50%粉煤灰與偏高嶺土、硅灰復(fù)摻時(shí),在僅輔以高效減水劑條件下能夠配制出滿足簡(jiǎn)單噴射施工要求的PVA-ECC,并得到若干組配合比。 (2)通過(guò)抗壓強(qiáng)度試驗(yàn)和薄板彎曲試驗(yàn),研究了不同摻合料和摻量對(duì)基本力學(xué)性能的影響規(guī)律。研究結(jié)果表明：隨著摻和料摻量增加對(duì)抗壓強(qiáng)度不利,但可以明顯提高抗彎性能；當(dāng)在單摻50%粉煤灰基礎(chǔ)上三種摻合料復(fù)摻時(shí)效果最好。 (3)通過(guò)快速碳化試驗(yàn)和電通量試驗(yàn),研究了不同摻合料和摻量對(duì)抗碳化能力及抗氯離子滲透能力等耐久性的影響規(guī)律。研究結(jié)果表明：粉煤灰摻量超過(guò)30%會(huì)明顯導(dǎo)致材料抗碳化性能降低,但抗氯離子滲透能力卻有顯著提高。當(dāng)在單摻50%粉煤灰基礎(chǔ)上復(fù)摻硅灰后,能夠適當(dāng)改善抗碳化性能；復(fù)摻偏高嶺土后,對(duì)提高抗碳化性能不明顯。偏高嶺土、硅灰對(duì)阻止氯離子滲透有顯著作用,偏高嶺土效果更好于硅灰；與50%粉煤復(fù)摻后,可充分發(fā)揮疊加效應(yīng),尤其對(duì)早期抗氯離子滲透性能有更大提高作用。 (4)提出了可供具體工程噴射施工參考的PVA-ECC配合比建議。
[Abstract]:PVA-ECC(Engineered cementitious composites. PVA (polyvinyl alcohol) is a kind of polyvinyl alcohol (PVA), which has been developed rapidly in recent years. Fiber as a reinforced fiber super-high toughness cement matrix composites, because of its multi-joint cracking and remarkable strain-hardening phenomenon and other traditional cement-based materials do not have many excellent properties. At present, the research and application of PVA-ECC mainly focus on the general pouring performance. There are few related studies on the performance of jet construction. Combined with the existing research results of ordinary PVA-ECC, the PVA-ECC with jetting performance has been preliminarily explored and studied. The main work and findings are as follows: 1) the effects of different admixtures and contents on the performance of the mixture were studied. The results showed that only 50% fly ash or 50% fly ash were mixed with metakaolin. When the silica fume is mixed, PVA-ECCs which can meet the requirements of simple spray construction can be prepared under the condition of only adding superplasticizer, and some groups of mixing ratio can be obtained. 2) through the compressive strength test and the bending test of thin plate, the influence of different admixtures and contents on the basic mechanical properties is studied. The results show that the increase of the content of the admixture is unfavorable to the compressive strength. But the bending resistance can be improved obviously. The effect is the best when the three admixtures are mixed on the basis of 50% fly ash. Through rapid carbonization test and electric flux test. The effects of different admixtures and amounts on the durability such as resistance to carbonation and resistance to chloride ion penetration were studied. The results showed that the carbonation resistance of the materials decreased obviously when the content of fly ash exceeded 30%. However, the resistance to chloride ion permeation has been improved significantly. The carbonation resistance can be improved when the silica fume is added on the basis of 50% fly ash. After mixed with metakaolin, the carbonization resistance was not obviously improved. Metakaolin and silica fume had significant effect on preventing chloride ion permeation, and the effect of metakaolin was better than that of silica fume. When mixed with 50% pulverized coal, the superposition effect can be brought into full play, especially the resistance to chlorine ion permeation in the early stage can be improved more greatly. Finally, the paper puts forward the suggestion of PVA-ECC mix ratio which can be used as reference for specific project jet construction.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

【參考文獻(xiàn)】

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