本文選題：活性粉末混凝土　切入點：玄武巖纖維　出處：《東北電力大學》2017年碩士論文

【摘要】：活性粉末混凝土(Reactive Powder Concrete,簡稱RPC)是一種新型的高強度、高耐久性混凝土,由于其優(yōu)良的性能而具有廣泛的應(yīng)用前景。但由于RPC中常用的鋼纖維成本較高,且鋼纖維在氯離子和除冰鹽等惡劣環(huán)境下容易發(fā)生銹蝕,因此,越來越多的學者開始著手于用其它種類纖維來代替鋼纖維的研究。為了了解玄武巖纖維在RPC中的應(yīng)用前景,本文用玄武巖纖維代替鋼纖維,對玄武巖纖維RPC進行了以下研究并得到了相關(guān)結(jié)論:1.以玄武巖纖維RPC的水膠比、纖維長度、纖維體積摻量和養(yǎng)護齡期為影響因素,設(shè)計制作了十五組不同配合比共180個試件,分別進行了立方體抗壓試驗和劈裂抗拉試驗,確定不同參數(shù)對玄武巖纖維RPC強度的影響規(guī)律。試驗結(jié)果表明:對于立方體抗壓試驗和劈裂抗拉試驗,最佳的水膠比均為0.22,對于12mm長玄武巖纖維,最佳纖維體積摻量為0.10%,對于6mm長玄武巖纖維,最佳纖維體積摻量為0.05%。玄武巖纖維對RPC的立方體抗壓強度無明顯影響規(guī)律,對劈裂抗拉強度的有明顯的增強作用。相同體積摻量下?lián)接?2mm長纖維的試件強度高于摻有6mm長纖維。玄武巖纖維的摻入對RPC早期強度影響較小。2.以玄武巖纖維長度、纖維體積摻量為影響因素,制作了四組試件,進行玄武巖纖維RPC的軸心抗壓試驗。結(jié)果表明摻入玄武巖纖維后,試件的變形能力得到了提高、破壞過程得到了延緩;摻有12mm長纖維的試件的最佳纖維摻量為0.10%。根據(jù)試驗數(shù)據(jù)繪制了玄武巖纖維RPC的應(yīng)力-應(yīng)變?nèi)�,采用分段方程對其本構(gòu)關(guān)系進行擬合,并與試驗曲線相對比,擬合結(jié)果較好。3.考慮水膠比和纖維體積摻量對玄武巖纖維RPC抗氯離子滲透性能的影響,制作了十二組共36個試件進行試驗,試驗結(jié)果表明,水膠比為0.22、纖維體積摻量為0.10%的試件的抗氯離子滲透性能最好,所有配合比的玄武巖纖維RPC的電通量均在可忽略范圍,即玄武巖纖維RPC的抗氯離子滲透性能較好。對一組玄武巖纖維RPC試件進行了碳化試驗,在碳化進行28天時仍未測試到碳化深度,即玄武巖纖維RPC具有良好的抗碳化性能。由此可知,玄武巖纖維RPC在耐久性上有良好的表現(xiàn)。
[Abstract]:Reactive Powder concrete (RPCs) is a new type of high strength and high durability concrete, which has a wide application prospect because of its excellent performance.However, due to the high cost of steel fibers commonly used in RPC, and the corrosion of steel fibers in harsh environments such as chloride ions and deicing salts, more and more researchers have begun to study the replacement of steel fibers with other types of fibers.In order to understand the application prospect of basalt fiber in RPC, basalt fiber is used instead of steel fiber in this paper. The basalt fiber RPC is studied as follows and the relevant conclusion: 1.Taking the water-binder ratio, fiber length, fiber volume content and curing age of basalt fiber RPC as the influencing factors, fifteen groups of 180 specimens with different blending ratios were designed and made, and the cube compression test and splitting tensile test were carried out respectively.The influence of different parameters on the RPC strength of basalt fiber is determined.The results show that the optimum water-binder ratio is 0.22 for cube compression test and splitting tensile test, 0.10 for 12mm long basalt fiber, and 0.05 for 6mm long basalt fiber.The basalt fiber has no obvious influence on the cube compressive strength of RPC, but has obvious enhancement effect on the splitting tensile strength.The strength of the specimens doped with 12mm long fibers is higher than that with 6mm long fibers at the same volume.The effect of basalt fiber incorporation on the early strength of RPC is small. 2.Taking the length of basalt fiber and the volume of fiber as the influencing factors, four groups of specimens were made and the axial compression test of basalt fiber RPC was carried out.The results show that the deformation ability of the specimen is improved and the failure process is delayed after the addition of basalt fiber, and the optimum fiber content of the specimen with long 12mm fiber is 0.10%.According to the experimental data, the stress-strain curve of basalt fiber RPC was drawn, and the constitutive relation was fitted by the piecewise equation. Compared with the experimental curve, the fitting result was better. 3.Considering the effects of water / binder ratio and fiber volume content on the permeability of basalt fiber RPC to chloride ions, twelve groups of 36 specimens were made and the results showed that,It can be seen that the durability of basalt fiber RPC is good.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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相關(guān)期刊論文 前10條

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本文編號：1687794