【摘要】：纖維增強(qiáng)復(fù)合材料作為一種新型復(fù)合材料應(yīng)用于混凝土結(jié)構(gòu)中,主要通過兩種形式:一種是利用纖維材料耐腐蝕、輕質(zhì)高強(qiáng)的特性,經(jīng)過加工制作成纖維筋代替鋼筋,從而解決鋼筋長期使用銹蝕所造成的耐久性及安全性問題;另一種是利用纖維短切紗良好的力學(xué)性能,摻入混凝土基體中對(duì)結(jié)構(gòu)起到增韌阻裂的效果。隨著社會(huì)的發(fā)展,環(huán)境問題得到重視,廢棄混凝土作為再生骨料用于再生混凝土結(jié)構(gòu)中,有效解決了廢棄混凝土對(duì)環(huán)境的污染以及對(duì)天然石料的開采,但是由于再生骨料各項(xiàng)性能低于普通骨料,導(dǎo)致再生混凝土的力學(xué)性能比普通混凝土略低。故利用纖維材料良好的性能,與再生混凝土相結(jié)合,可將兩者優(yōu)點(diǎn)充分發(fā)揮,起到互補(bǔ)作用。對(duì)于纖維再生混凝土的研究,國內(nèi)仍處于起步階段,大部分集中對(duì)再生混凝土的力學(xué)性能研究,在其抗凍性能方面的研究仍不成熟。本文為研究凍融循環(huán)條件下玄武巖-聚丙烯混雜纖維再生混凝土與BFRP筋的粘結(jié)性能,通過中心拉拔試驗(yàn)研究不同凍融循環(huán)次數(shù)、單摻纖維不同體積摻量、混摻纖維不同體積摻量三種因素對(duì)BFRP筋與混雜纖維再生混凝土粘結(jié)性能的影響及粘結(jié)-滑移本構(gòu)關(guān)系模型。主要研究工作如下:(1)通過立方體抗壓強(qiáng)度試驗(yàn)、劈裂抗拉強(qiáng)度試驗(yàn)、軸心抗壓強(qiáng)度試驗(yàn)及靜力受壓彈性模量試驗(yàn)對(duì)凍融循環(huán)條件下混雜纖維再生混凝土力學(xué)性能進(jìn)行研究,結(jié)果表明:單一摻入纖維的再生混凝土除劈拉強(qiáng)度得到提高,其他三種力學(xué)性能均有所降低;而混雜纖維再生混凝土各項(xiàng)力學(xué)性能指標(biāo)均得到提高,但是也有一定范圍,摻量過多會(huì)減弱混雜纖維對(duì)混凝土性能的改善,其中摻入玄武巖纖維體積摻量0.3%時(shí),對(duì)混雜纖維再生混凝土起到最優(yōu)效果,經(jīng)過凍融循環(huán)后的混雜纖維再生混凝土力學(xué)性能得到提高。(2)通過中心拉拔試驗(yàn),主要研究不同凍融循環(huán)次數(shù)、單摻和混摻纖維摻量三種因素對(duì)BFRP筋與再生混凝土基體之間粘結(jié)性能的影響,并得到粘結(jié)-滑移曲線。結(jié)果表明:單摻纖維時(shí)BFRP筋與再生混凝土粘結(jié)應(yīng)力有所降低,但是改善了粘結(jié)性能的延性,玄武巖纖維摻量單摻0.3%時(shí)效果最優(yōu);混摻纖維提高了BFRP筋與再生混凝土粘結(jié)性能和混凝土延性,但是有一定范圍,纖維摻量過多減弱對(duì)粘結(jié)強(qiáng)度的改善;經(jīng)過凍融循環(huán)后的纖維再生混凝土與BFRP筋粘結(jié)強(qiáng)度均得到提高。(3)結(jié)合國內(nèi)外相關(guān)的粘結(jié)-滑移本構(gòu)關(guān)系模型與試驗(yàn)所得粘結(jié)-滑移曲線,通過試驗(yàn)所得數(shù)據(jù)建立四段式凍融條件下BFRP筋與混雜纖維再生混凝土粘結(jié)-滑移本構(gòu)關(guān)系模型,并與試驗(yàn)值進(jìn)行比較,擬合效果較好。
[Abstract]:As a new type of composite material, fiber reinforced composites are mainly used in concrete structures in two forms: one is to use the characteristics of corrosion resistance, light weight and high strength of fiber materials to produce fiber tendons instead of steel bars. In order to solve the durability and safety problems caused by the long-term use of steel bar corrosion, the other is to use the good mechanical properties of fiber shearing yarn, and the effect of toughening and cracking resistance to the structure can be achieved by adding it into the concrete matrix. With the development of society, environmental problems have been paid attention to. Waste concrete is used as recycled aggregate in recycled concrete structure, which effectively solves the pollution of waste concrete to the environment and the exploitation of natural stone. However, the properties of recycled aggregate are lower than that of ordinary aggregate, which leads to the mechanical properties of recycled concrete being slightly lower than that of ordinary concrete. Therefore, combining the good properties of fiber materials with recycled concrete can give full play to the advantages of the two materials and play a complementary role. The research of fiber recycled concrete is still in the initial stage in China. Most of the researches focus on the mechanical properties of recycled concrete, and the research on its frost resistance is still immature. In order to study the bond behavior between basalt polypropylene hybrid fiber recycled concrete and BFRP tendons under freeze-thaw cycle conditions, the central drawing tests were carried out to study the different freeze-thaw cycles and the volume content of single fiber. The effect of three factors with different volume content of mixed fiber on the bond properties of BFRP tendons and hybrid fiber recycled concrete and the bond-slip constitutive relation model. The main research works are as follows: (1) the mechanical properties of hybrid regenerated concrete under freeze-thaw cycle are studied by cube compressive strength test, splitting tensile strength test, axial compressive strength test and static compressive elastic modulus test. The results show that the tensile strength of recycled concrete with single fiber is increased, and the other three mechanical properties are decreased, while the mechanical properties of recycled concrete with hybrid fiber are all improved, but there is also a certain range. When the volume of basalt fiber is 0.3, the reclaimed concrete with hybrid fiber has the best effect, too much admixture will weaken the improvement of concrete performance of hybrid fiber, and when the volume of basalt fiber is 0.3, the reclaimed concrete with hybrid fiber will have the best effect. After freeze-thaw cycle, the mechanical properties of hybrid fiber recycled concrete are improved. (2) through central drawing test, the different freeze-thaw cycles are studied. The effect of single and mixed fiber content on the bond behavior between BFRP bars and recycled concrete matrix was investigated and the bond-slip curve was obtained. The results show that the bond stress between BFRP tendons and recycled concrete decreases, but the ductility of bond properties is improved. The bond properties and ductility of recycled concrete and BFRP tendons were improved by blending fiber, but the bond strength was improved by excessive fiber addition. After freeze-thaw cycle, the bond strength between regenerated fiber reinforced concrete and BFRP tendons has been improved. (3) the bond-slip constitutive relationship model and the bond-slip curve obtained from the experiment are combined with the domestic and foreign models. The bond-slip constitutive relation model of BFRP bar and hybrid fiber recycled concrete under four stage freeze-thaw condition was established and compared with the experimental data.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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本文編號(hào)：2188485