本文關(guān)鍵詞：混雜纖維對超高性能混凝土增強增韌影響的研究　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混雜纖維 超高性能混凝土 強韌化效應(yīng) 力學(xué)性能 粗骨料

【摘要】：本論文主要研究了混雜纖維對超高性能混凝土(Ultra High Performance Concrete,UHPC)強度和韌性的影響。首先,通過比較兩種異形鋼纖維(波紋形和端鉤型)分別與中尺寸的平直鋼纖維復(fù)摻后UHPC的強度和韌性,優(yōu)選出較好的異形鋼纖維。然后,將優(yōu)選出的鋼纖維分別與聚乙烯纖維、玄武巖纖維和中尺寸的平直鋼纖維復(fù)摻,研究纖維雙摻對UHPC強韌化的效果,尋找最佳纖維雙摻組合;并在此基礎(chǔ)上,將該最佳雙摻組合分別與聚乙烯纖維、玄武巖纖維和小尺寸的平直鋼纖維進行三摻,探索不同尺度纖維混雜對UHPC增強和增韌的影響。最后,將粗骨料以體積取代水泥砂漿的方式摻入強韌化效果最佳的三尺度混雜纖維UHPC中,分析粗骨料摻量對UHPC強度和韌性的影響。試驗測試方法包括抗壓強度、劈裂抗拉強度、斷裂能和四點彎曲性能。試驗結(jié)果表明,與波紋形鋼纖維和中尺寸平直鋼纖維復(fù)摻相比,端鉤型鋼纖維和中尺寸平直鋼纖維復(fù)摻UHPC的強韌化效果更佳,這是因為端鉤型狀比波紋形狀與混凝土基質(zhì)的粘結(jié)性能更好。就兩尺度纖維組合而言,鋼-聚乙烯纖維復(fù)摻UHPC的增強增韌效果優(yōu)于鋼-玄武巖纖維和鋼-鋼纖維復(fù)摻的情況;對于三尺度纖維組合,鋼-鋼-聚乙烯纖維的增強增韌效果優(yōu)于鋼-鋼-玄武巖纖維和鋼-鋼-鋼纖維的復(fù)摻。對比不同尺度纖維混摻UHPC的力學(xué)性能發(fā)現(xiàn),當纖維總摻量相同時,三尺度纖維復(fù)摻效果略優(yōu)于兩尺度纖維的復(fù)摻,鋼-鋼-聚乙烯纖維組合UHPC比鋼-聚乙烯纖維組合的抗壓強度、劈拉強度和斷裂能分別提高了 6%、3%和10%;而兩尺度纖維復(fù)摻效果優(yōu)于單摻纖維,鋼-聚乙烯纖維組合比單摻聚乙烯纖維的抗壓強度、劈拉強度和斷裂能分別提高了 5%、58%和2.1倍。UHPC的抗壓強度和劈裂抗拉強度均隨粗骨料摻量的增加而逐漸降低,且劈裂抗拉強度的下降幅度非常大,當粗骨料的摻量達到30%,UHPC的斷裂能下降45%。
[Abstract]:In this paper, the effect of hybrid fiber on strength and toughness of Ultra High Performance reinforced concrete (UHPC) is studied. By comparing the strength and toughness of two kinds of profiled steel fibers (corrugated and end hook) and medium size plain straight steel fibers, the better special-shaped steel fibers were selected. The excellent steel fiber was mixed with polyethylene fiber basalt fiber and medium size straight steel fiber respectively to study the effect of fiber double admixture on the strength and toughness of UHPC and to find the best combination of fiber double admixture. On the basis of this, the optimum combination was tri-doped with polyethylene fiber, basalt fiber and small size straight steel fiber respectively. The effect of fiber mixing on UHPC strengthening and toughening was explored. Finally, the coarse aggregate was added into the three-scale hybrid fiber UHPC which had the best toughening effect by volume replacement of cement mortar. The influence of coarse aggregate content on the strength and toughness of UHPC is analyzed. The test methods include compressive strength, splitting tensile strength, fracture energy and four-point bending property. Compared with corrugated steel fiber and medium size straight steel fiber, the strength and toughness effect of end hook steel fiber and medium size straight steel fiber mixed with UHPC is better than that of corrugated steel fiber and medium size straight steel fiber. This is because the end hook shape is better than the corrugated shape than the concrete matrix. In the case of two-scale fiber combination. The reinforcing and toughening effect of steel / polyethylene fiber mixed with UHPC is better than that of steel basalt fiber and steel steel fiber. For three-scale fiber combinations. The reinforcing and toughening effect of steel-steel-polyethylene fiber is better than that of steel-steel-basalt fiber and steel-steel-steel fiber. When the total fiber content is the same, the effect of three-scale fiber blending is slightly better than that of two-scale fiber, and the compressive strength of steel-steel-polyethylene fiber combination UHPC is higher than that of steel-polyethylene fiber combination. The splitting tensile strength and fracture energy increased by 6% and 10% respectively. The effect of two-scale fiber blending is better than that of single-doped fiber, and the compressive strength, splitting strength and fracture energy of steel-polyethylene fiber combination are 5% higher than that of single-doped polyethylene fiber, respectively. The compressive strength and splitting tensile strength of 58% and 2.1-fold. UHPC decreased gradually with the increase of coarse aggregate content, and the extent of splitting tensile strength was very large, when the content of coarse aggregate reached 30%. The fracture energy of UHPC decreases by 45%.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前10條

1 朋改非;牛旭婧;趙怡琳;;異形鋼纖維對超高性能混凝土增強增韌的影響[J];建筑材料學(xué)報;2016年06期

2 陳從春;馮毅;陳曉冬;;鋼纖維體積摻量對超高性能混凝土力學(xué)性能的影響[J];新型建筑材料;2016年05期

3 鄧宗才;;混雜纖維增強超高性能混凝土彎曲韌性與評價方法[J];復(fù)合材料學(xué)報;2016年06期

4 張秀芝;董青;劉輝;張國棟;;鋼纖維-聚丙烯纖維混雜混凝土耐高溫性能研究[J];河北工業(yè)大學(xué)學(xué)報;2015年04期

5 黃政宇;李操旺;劉永強;;聚乙烯纖維對超高性能混凝土性能的影響[J];材料導(dǎo)報;2014年20期

6 朋改非;滕巖;黃艷竹;林力勛;令狐延;;含粗骨料的超高性能混凝土火災(zāi)高溫性能研究[J];華北水利水電學(xué)院學(xué)報;2013年01期

7 康亞明;劉長武;韓小剛;王東;;鋼纖維幾何尺寸對鋼纖維混凝土損傷變形特性的影響[J];土木工程學(xué)報;2010年04期

8 徐世p，

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