發(fā)布時(shí)間：2018-03-03 03:19

  本文選題：應(yīng)變硬化　切入點(diǎn)：水泥基復(fù)合材料　出處：《功能材料》2014年21期 　論文類型：期刊論文

【摘要】：采用聚乙烯醇纖維(PVA)纖維作為增強(qiáng)材料,選定不同的粉煤灰摻量、石英砂級配、纖維摻量和養(yǎng)護(hù)工藝配制應(yīng)變硬化水泥基復(fù)合材料(SHCC),研究上述因素對SHCC力學(xué)性能的影響。研究表明,隨著粉煤灰摻量的增加,SHCC極限拉伸強(qiáng)度有少許削弱,但極限拉伸應(yīng)變不斷增加,均高于3%。隨著養(yǎng)護(hù)齡期增加,SHCC極限拉伸應(yīng)變呈現(xiàn)先增加后減小的趨勢,但拉伸強(qiáng)度隨齡期增加而增大。自然養(yǎng)護(hù)有利于維持SHCC的高極限拉伸應(yīng)變;蒸汽養(yǎng)護(hù)能提高SHCC早期的極限拉伸強(qiáng)度,但蒸汽養(yǎng)護(hù)使SHCC的極限拉伸應(yīng)變隨著齡期增加而明顯降低。當(dāng)m(FA)/m(C)=1.6,2.0和2.4,Vf=2.0%時(shí),采用較細(xì)的石英砂和自然養(yǎng)護(hù),28d齡期的SHCC極限拉伸強(qiáng)度在4 MPa以上,極限拉伸應(yīng)變在3%以上。
[Abstract]:Polyvinyl alcohol fiber (PVA) fiber was used as reinforcing material, different fly ash content and quartz sand gradation were selected. The effects of the above factors on the mechanical properties of strain hardening cement matrix composites (SHCCs) were studied. The results showed that the ultimate tensile strength of SHCC decreased with the increase of the content of fly ash. With the increase of curing age, the ultimate tensile strain of SHCC increased first and then decreased, but the tensile strength increased with the increase of age. Natural curing was beneficial to maintain the high ultimate tensile strain of SHCC. Steam curing can increase the early ultimate tensile strength of SHCC, but steam curing can decrease the ultimate tensile strain of SHCC with increasing age. The ultimate tensile strength of SHCC with fine quartz sand and natural curing age of 28 d is above 4 MPa and the ultimate tensile strain is more than 3%.
【作者單位】： 武漢理工大學(xué)理學(xué)院;
【基金】：國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(2013AA031306) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2013-1a-035)
【分類號】：TU528

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本文編號：1559322