本文選題：纖維增強聚合物筋　切入點：纖維增強水泥基復合材料　出處：《武漢理工大學》2015年碩士論文

【摘要】：利用纖維增強聚合物(FRP)筋取代鋼筋作為混凝土結構增強筋可以有效解決侵蝕環(huán)境下鋼筋銹蝕問題,但由于FRP筋和混凝土均屬于脆性材料,存在延性不足的問題,FRP筋混凝土結構常常呈脆性破壞。本文通過合理的纖維摻量制備得到一種具有高韌性的纖維增強水泥基復合材料(FRCC),并用FRCC代替普通混凝土作為基體,試圖提高FRP筋混凝土結構的延性以及耐久性,為FRP筋-FRCC新型結構形式的推廣應用做探索性研究。本文首先研究了纖維體積摻量以及纖維表面處理方式對FRCC力學性能和韌性的影響,確定了較優(yōu)的配合比,然后研究了配筋FRCC梁的抗彎性能。其次,研究了FRP筋與水泥基體在不同環(huán)境下的粘結性能。最后,分析了海水環(huán)境對FRP筋與基體界面過渡區(qū)的影響。實驗研究表明:(1)FRP筋可以顯著提高FRCC梁的抗彎承載力和延性,其延性以及抗彎承載力均明顯優(yōu)于FRP筋混凝土梁,并且FRP筋-FRCC梁的彎曲破壞形式為塑性破壞,具有類似于鋼筋混凝土梁的屈服平臺特征,表現(xiàn)出良好的延性。(2)標準養(yǎng)護條件下,FRP筋和鋼筋與普通混凝土的粘結強度大小相當,但FRP筋與普通混凝土的粘結破壞形式為混凝土劈裂破壞,相對滑移量較小,缺乏延性,呈現(xiàn)明顯的脆性破壞。FRP筋與FRCC的粘結強度較普通混凝土大幅度提高,增長比例在60%~80%,并且FRP筋在FRCC中產(chǎn)生較大的滑移,FRP筋與FRCC的粘結破壞形式為FRP筋拔出且FRCC開裂,FRP筋與FRCC表現(xiàn)出較好的粘結延性。(3)海水環(huán)境下FRP筋與普通混凝土的粘結強度較標準養(yǎng)護條件下的粘結強度降低幅度達20%,破壞形式仍是明顯的脆性劈裂破壞。海水環(huán)境下FRP筋與FRCC的粘結強度較標準養(yǎng)護條件下降低5%左右,破壞形式仍為FRP筋拔出且FRCC開裂。在海水環(huán)境下,FRP筋與FRCC的粘結性能無明顯退化。(4)相比于海水浸泡環(huán)境,潮汐作用下FRP筋與FRCC的粘結強度出現(xiàn)小幅度下降,但仍然呈延性破壞,而FRP筋與普通混凝土在潮汐作用下的粘結強度較無潮汐環(huán)境降低15%左右。即使在潮汐環(huán)境下,FRP筋與FRCC的粘結強度也較標準養(yǎng)護條件下FRP筋與普通混凝土的粘結強度高出50%左右。因此,FRP筋與FRCC具有良好的粘結性能和耐久性能,使得FRP筋-FRCC結構在惡劣環(huán)境下具有良好的長期工作性能。(5)堿性環(huán)境會對BFRP筋、GFRP筋產(chǎn)生一定的侵蝕,導致其抗拉強度降低。海水腐蝕環(huán)境使得FRP筋與FRCC界面過渡區(qū)的顯微硬度略微降低,寬度變大,并且在從SEM圖中可以看出,海水環(huán)境下形成較多膨脹性產(chǎn)物AFt,導致裂紋,但總體來說FRP筋-FRCC結構的力學性能、耐久性能均明顯優(yōu)于FRP筋混凝土結構。FRP筋-FRCC新型結構形式在海洋工程、冬季撒除冰鹽的道路與橋梁工程等領域?qū)⒕哂袕V闊的應用前景。
[Abstract]:Using fiber reinforced polymer (FRP) tendons to replace steel bars as reinforced bars of concrete structures can effectively solve the problem of corrosion of steel bars under corrosive environment. However, both FRP bars and concrete are brittle materials. In this paper, a kind of fiber reinforced cement matrix composite with high toughness is prepared by reasonable fiber content, and FRCC is used instead of ordinary concrete as matrix. This paper attempts to improve the ductility and durability of concrete structures with FRP bars. In this paper, the effects of fiber volume content and fiber surface treatment on the mechanical properties and toughness of FRP reinforced FRCC are studied, and the optimum blending ratio is determined. Then, the flexural properties of reinforced FRCC beams are studied. Secondly, the bonding properties of FRP tendons and cement matrix in different environments are studied. The influence of seawater environment on the transition zone between FRP bars and matrix is analyzed. The experimental results show that the flexural bearing capacity and ductility of FRCC beams can be significantly improved by using FRP tendons. The ductility and flexural bearing capacity of FRCC beams are obviously better than that of concrete beams reinforced with FRP bars. And the bending failure form of FRP beam-FRCC beam is plastic failure, which is similar to the yield platform characteristic of reinforced concrete beam, and shows good ductility. However, the bond failure between FRP tendons and ordinary concrete is in the form of concrete splitting failure, the relative slip is small, and the ductility is lacking. The bond strength between FRP tendons and FRCC is much higher than that of ordinary concrete. The ratio of increase is between 60% and 80%, and the form of bond failure of FRP tendons in FRCC is that FRP tendons are pulled out and FRCC cracks FRP tendons have good bond ductility with FRCC.) in seawater environment, FRP tendons and ordinary concrete show good adhesion and ductility. Compared with the standard curing condition, the bond strength of the joint strength is reduced by 20%, and the failure form is still obvious brittle splitting failure. The bond strength between FRP bars and FRCC in seawater environment is about 5% lower than that under the standard curing condition. Compared with seawater immersion, the bond strength of FRP tendons with FRCC decreased slightly, but it still showed ductile failure, compared with the seawater immersion environment, the bond strength between FRP bars and FRCC decreased slightly, but it was still ductile in seawater environment, and the bond strength between FRP tendons and FRCC was still ductile, compared with the seawater immersion environment, and the bond strength between FRP tendons and FRCC was decreased slightly, but it was still ductile in seawater environment. The bond strength between FRP bars and ordinary concrete under tidal conditions is about 15% lower than that of normal concrete under tidal conditions. Even in tidal environment, the bond strength between FRP tendons and ordinary concrete is stronger than that between FRP bars and ordinary concrete under standard curing conditions. The degree is about 50% higher. Therefore, FRP bar and FRCC have good bond performance and durability. The results show that the FRP tendon-FRCC structure has good long-term working performance under the harsh environment. (5) Alkaline environment will cause a certain erosion of the BFRP tendons. In seawater corrosion environment, the microhardness of the transition zone between FRP bars and FRCC is slightly reduced and the width is enlarged. It can be seen from the SEM diagram that more expansive products AFT are formed in seawater environment, which leads to cracks. But on the whole, the mechanical properties and durability of FRP reinforced FRCC structures are obviously superior to those of FRP reinforced concrete structures. FRP-FRCC new structural forms will have broad application prospects in ocean engineering, road and bridge engineering with desiccated salt in winter and so on.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ172.7;TB332

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