纖維素纖維親——水性極強的天然纖維素纖維

發布日期：2017-09-07 作者：點擊：

我們研究了纖維素纖維增強混凝土的抗彎韌性，同時進行了合成纖維、鋼纖維及混雜纖維混凝土的夸曲韌性試驗，側定了纖維混凝土梁的荷載一撓度全曲線.基于美國ASTM方法.分析了纖維素纖維、合成纖維、鑰纖維及其混雜纖維增強混凝土的彎曲韌性.研究表明，纖維家纖維可提高混凝土抗彎韌性和變形能力，韌性指數幾。分別比家混凝土提高了3.0和5.8倍;在纖維體積率相同情況下，纖維家纖維混凝土抗彎韌性高于聚丙烯纖維混凝土;纖維素纖維和鋼纖維混雜使用顯著改善了混凝土的韌性和變形性能，使混凝土由脆性破壞變為延性破壞。

混(hun)(hun)凝(ning)土(tu)具有抗(kang)壓強度高、剛度大(da)的(de)特性(xing)(xing)(xing)，但抗(kang)裂(lie)性(xing)(xing)(xing)、抗(kang)沖擊性(xing)(xing)(xing)和(he)變形能(neng)力較(jiao)差.因此，通過摻入纖(xian)維(wei)來改(gai)善混(hun)(hun)凝(ning)土(tu)韌性(xing)(xing)(xing)等(deng)性(xing)(xing)(xing)能(neng)是(shi)今后發展方向.纖(xian)維(wei)混(hun)(hun)凝(ning)土(tu)中擁有根數(shu)巨多的(de)亂(luan)向分布的(de)纖(xian)維(wei)，可以有效防(fang)止混(hun)(hun)凝(ning)土(tu)的(de)早(zao)期開裂(lie)，改(gai)善混(hun)(hun)凝(ning)土(tu)的(de)品質，減少混(hun)(hun)凝(ning)土(tu)在施工期的(de)裂(lie)縫和(he)缺陷，提高混(hun)(hun)凝(ning)土(tu)的(de)韌性(xing)(xing)(xing)、抗(kang)沖擊、抗(kang)凍(dong)融、抗(kang)滲(shen)、抗(kang)疲勞等(deng)耐久(jiu)性(xing)(xing)(xing)。

纖(xian)(xian)維是新一代(dai)纖(xian)(xian)維，它既不同于早(zao)期的天然木質(zhi)纖(xian)(xian)維，是一種基因改良的天然纖(xian)(xian)維素纖(xian)(xian)維，可(ke)應(ying)用于橋梁、鐵道(dao)(dao)(dao)、隧道(dao)(dao)(dao)、水利(li)水電(dian)、機場道(dao)(dao)(dao)面、工(gong)業(ye)地坪、路(lu)面工(gong)程等領域，還可(ke)用于預制鐵道(dao)(dao)(dao)軌枕、電(dian)桿和各種管(guan)道(dao)(dao)(dao)等。

纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)素(su)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)本身具備極好的(de)(de)(de)親水(shui)性(xing)，在(zai)(zai)新拌(ban)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)中(zhong)能(neng)吸附一部(bu)分(fen)(fen)自由(you)(you)水(shui)，而且(qie)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)基體內(nei)部(bu)有天然(ran)空腔，能(neng)蓄存纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)本身質量約70%的(de)(de)(de)自由(you)(you)水(shui)，在(zai)(zai)水(shui)泥水(shui)化(hua)的(de)(de)(de)過程中(zhong)，這2部(bu)分(fen)(fen)水(shui)分(fen)(fen)會(hui)緩(huan)慢釋放，促進水(shui)泥繼續水(shui)化(hua)，補償混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)的(de)(de)(de)收縮，改善(shan)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)微觀結(jie)構(gou)，減少混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)內(nei)部(bu)微缺陷，使混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)更加密實(shi)。纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)素(su)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)的(de)(de)(de)直徑較(jiao)細，長度也較(jiao)短，對(dui)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)流動(dong)性(xing)和(he)坍落度損失的(de)(de)(de)影響也很(hen)小.在(zai)(zai)現場施工(gong)(gong)中(zhong)，對(dui)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)施工(gong)(gong)性(xing)能(neng)幾乎沒有影響，對(dui)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)和(he)易(yi)性(xing)還有幫助(zhu)。纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)素(su)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)由(you)(you)于具備天然(ran)親水(shui)性(xing)及長度較(jiao)短的(de)(de)(de)特(te)點，在(zai)(zai)混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)粗骨料剪(jian)切下易(yi)分(fen)(fen)散且(qie)分(fen)(fen)散后不再團聚，均勻分(fen)(fen)布于混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)中(zhong)，形成三維(wei)(wei)(wei)(wei)網絡結(jie)構(gou).當纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)長度為(wei)(wei)12 mm時，每kg聚丙烯纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)為(wei)(wei)7.6億根(gen)(gen)(gen)，聚丙烯睛有11億根(gen)(gen)(gen)，而鼎強纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)素(su)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)可達15.9億根(gen)(gen)(gen).由(you)(you)于纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)素(su)纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)根(gen)(gen)(gen)數巨多(duo)，比(bi)表面積大(da)，增大(da)了纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)與混(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)(tu)的(de)(de)(de)接觸面積，有效地(di)改善(shan)了纖(xian)(xian)(xian)維(wei)(wei)(wei)(wei)與基體的(de)(de)(de)鉆(zhan)結(jie)性(xing)能(neng)。

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