【摘要】：通過自制模具實現(xiàn)了對鋼纖維從水泥石基體中拔出的實驗測試,得到基體混凝土中鋼纖維體積摻量為0~1.2%、硅灰取代水泥質量摻量為0~12%時鋼纖維拉拔荷載-位移曲線圖,通過顯微硬度和SEM試驗,測試得到了鋼纖維-水泥石界面纖維硬度及界面區(qū)微觀形貌特征。在測試基礎上,提出了界面黏結拉拔韌性概念,并計算得到了界面黏結強度和拉拔韌性,分析了硅灰對界面黏結強度、拉拔韌性、界面顯微硬度和微觀形貌特征的影響規(guī)律。研究結果表明,硅灰改善了鋼纖維-水泥石界面黏結性能,使界面黏結強度提高了10.7%~44.2%;界面區(qū)顯微硬度提高了7.4%~38.8%,界面最薄弱層與鋼纖維表面的距離由普通混凝土的60μm縮小到40μm,且硅灰摻量越大,效果越好;硅灰使鋼纖維拉拔時峰值荷載對應的位移下降了4.1%~25.9%;對于不同摻量的鋼纖維混凝土,鋼纖維拔出韌性的最佳硅灰摻量為6%~9%。
[Abstract]:The experimental test of steel fiber pulling out from cement stone base was realized by self-made mould. The drawing load-displacement curve of steel fiber was obtained when the volume of steel fiber in matrix concrete was 0 ~ 1.2, and the mass content of silica fume replaced cement was 0 ~ 12, the drawing load displacement curve of steel fiber was obtained. The microhardness and micromorphology of the interface between steel fiber and cement stone were obtained by microhardness and SEM test. On the basis of testing, the concept of interfacial bond drawing toughness is put forward, and the interfacial bond strength and drawing toughness are calculated. The influence of silica fume on interfacial bonding strength, drawing toughness, interface microhardness and micromorphology is analyzed. The results show that silica fume can improve the interfacial bonding properties of steel fiber and cement stone. The interfacial bonding strength is increased by 10.7 and 44.2.The microhardness of the interface area is increased by 7.4and 38.8.The distance between the weakest layer of interface and the surface of steel fiber is reduced from 60 渭 m of ordinary concrete to 40 渭 m, and the greater the content of silica fume is, the better the effect is. Silica fume reduces the displacement corresponding to the peak load of steel fiber drawing by 4.1and 25.9.The optimum silicon fume content of steel fiber pull-out toughness is 6 / 9for steel fiber concrete with different content.
【作者單位】： 重慶交通大學材料科學與工程學院;重慶交通大學重慶西南水運科學研究所;廣西交通科學研究院;
【基金】：交通運輸部應用基礎研究項目(2013319814060) 重慶市科委攻關項目(2011GGC006)
【分類號】：U414

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