發(fā)布時(shí)間：2018-07-04 23:09

  本文選題：鋼纖維混凝土 + 聚合物改性混凝土　； 參考：《重慶交通大學(xué)》2017年碩士論文

【摘要】：聚合物改性混凝土與鋼纖維混凝土是兩種優(yōu)異的路面材料,有很多優(yōu)點(diǎn),但也有不足。本文運(yùn)用復(fù)合材料設(shè)計(jì)思想,將聚合物改性混凝土與鋼纖維混凝土復(fù)合化,把聚合物改性混凝土良好的變形能力、抗?jié)B性、耐磨抗滑性、低收縮性與鋼纖維混凝土優(yōu)異的抗彎拉、抗沖擊、抗疲勞性集于一體,形成混雜鋼纖維聚合物改性混凝土。利用掃描電鏡從微觀角度研究了聚合物改性機(jī)理,運(yùn)用復(fù)合力學(xué)理論、纖維間距理論、裂紋尖端閉合力模型從理論角度分析了鋼纖維阻裂機(jī)理;建立鋼纖維阻裂有限元模型,從有限元模擬角度分析了鋼纖維對(duì)裂紋尖端應(yīng)力強(qiáng)度因子和最大拉應(yīng)力影響。研究了混雜鋼纖維聚合物改性混凝土在不同鋼纖維摻量下多個(gè)方面的性能,并設(shè)置素混凝土、鋼纖維混凝土、聚合物改性混凝土作為對(duì)照。這些性能包括:工作性、收縮性和抗壓、抗折、斷裂韌性與斷裂能、抗沖擊等基本力學(xué)性能以及抗高溫、抗高溫+水、抗硫酸鹽、抗凍等耐久性能。本文主要研究結(jié)論如下:混雜鋼纖維聚合物改性混凝土中聚合物網(wǎng)狀薄膜、超短超細(xì)鋼纖維與波紋型鋼纖維一起組成多層次的阻裂網(wǎng)絡(luò),聚合物網(wǎng)狀薄膜、超短超細(xì)鋼纖維阻止或延緩混凝土內(nèi)部微小裂縫的產(chǎn)生與擴(kuò)展,波紋型鋼纖維則進(jìn)一步阻止宏觀裂縫的發(fā)展,引起裂縫擴(kuò)展的能量被大量消耗在克服這個(gè)多層次的阻裂網(wǎng)中。聚合物的加入能提高混凝土保水性,改善其工作性。聚合物與鋼纖維能有效減小混凝土收縮,減小因收縮應(yīng)力引起的混凝土內(nèi)部損傷。當(dāng)鋼纖維摻量較低時(shí),一般總體積摻量小于3%,鋼纖維對(duì)混凝土抗壓強(qiáng)度略有提高,而當(dāng)鋼纖維摻量較高,一般4%以上,抗壓強(qiáng)度會(huì)略有降低。相對(duì)素混凝土,混雜鋼纖維聚合物改性混凝土抗壓峰值力略小,但其彈性模量更小,試件破壞時(shí)豎向位移更大,消耗壓力機(jī)做功更多。鋼纖維的加入能明顯提高混凝土的抗折強(qiáng)度,提高幅度為22%~62%,且波紋型鋼纖維對(duì)混凝土試件抗折強(qiáng)度貢獻(xiàn)大于超短超細(xì)鋼纖維。混雜鋼纖維聚合物改性混凝土荷載-撓度曲線峰值過(guò)后,會(huì)出現(xiàn)明顯的齒狀形狀,曲線上一個(gè)個(gè)較大的鋸齒是一根根波紋型鋼纖維被拔出,大鋸齒上升段表示鋼纖維被拔出的過(guò)程,下降段則為對(duì)應(yīng)鋼纖維被拔出后,承載力下降�；祀s鋼纖維聚合物改性混凝土具有優(yōu)異的變形能力,極限拉應(yīng)變是素混凝土的4-6倍。相對(duì)鋼纖維混凝土,混雜鋼纖維聚合物改性混凝土具有更大的斷裂韌性與斷裂能以及更好的延性,其中斷裂韌性提高幅度為5.3%~33.8%,斷裂能提高幅度為9.8%~107.2%。隨鋼纖維體積摻量提高,混雜鋼纖維聚合物改性混凝土發(fā)生初裂、破壞對(duì)應(yīng)沖擊次數(shù)增多,混凝土沖擊韌性增大,且破壞時(shí)主裂縫由一條變?yōu)槎鄺l。相對(duì)鋼纖維混凝土,混雜鋼纖維聚合物改性混凝土具有更好的抗高溫、抗高溫+水、抗硫酸鹽、抗凍性能�；祀s鋼纖維聚合物混凝土60℃條件下抗折強(qiáng)度比常溫下有所提高,提高幅度為0.88%~8.78%�；祀s鋼纖維聚合物混凝土在60℃水中下養(yǎng)護(hù)28天抗折強(qiáng)度較常溫養(yǎng)護(hù)均有所下降,但下降幅度不大。
[Abstract]:Polymer modified concrete and steel fiber concrete are two excellent pavement materials, which have many advantages, but also have shortcomings. In this paper, the composite material design idea is used to combine polymer modified concrete with steel fiber concrete, and the good deformation ability, impermeability, wear-resisting and skid resistance, low shrinkage and steel fiber of the polymer modified concrete are made. It has excellent anti bending, impact resistance and fatigue resistance, forming a hybrid steel fiber polymer modified concrete. The mechanism of polymer modification is studied from the microscopic angle by scanning electron microscope. The theory of composite mechanics, the theory of fiber spacing and the closed force model of the crack tip are used to analyze the mechanism of the resistance to the steel fiber from the theoretical point of view. The effect of steel fiber on the stress intensity factor and maximum tensile stress at the crack tip is analyzed from the finite element simulation point of view. The properties of the mixed steel fiber polymer modified concrete in various aspects of the steel fiber are studied, and the concrete, steel fiber concrete and polymer modified concrete are set up. These properties include: working, contractility and compression, fracture resistance, fracture toughness and fracture energy, impact resistance and other basic mechanical properties as well as high temperature resistance, high temperature + water, sulfate resistance, frost resistance and other durability. The main conclusions are as follows: polymer mesh film, ultra short superfine steel fiber in hybrid steel fiber polymer modified concrete Together with corrugated steel fiber, a multilevel cracking network is formed. Polymer mesh film, ultra short superfine steel fiber prevents or delays the formation and expansion of small cracks in concrete. Corrugated steel fibers further prevent the development of macro cracks. The energy of crack expansion is consumed in overcoming this multilevel crack resistance network. The addition of polymer can improve the water retention of concrete and improve its working property. The polymer and steel fiber can effectively reduce the shrinkage of concrete and reduce the internal damage of concrete caused by the shrinkage stress. When the steel fiber content is low, the general volume content is less than 3%, and the steel fiber has a slight increase in the compressive strength of the coagulant soil, while the amount of steel fiber is added. Higher, more than 4%, the compressive strength will be slightly lower. Relative plain concrete, mixed steel fiber polymer modified concrete compression peak force is slightly smaller, but its modulus is smaller, the vertical displacement is greater when the specimen is damaged, and more work is done by the press. The addition of steel fiber can obviously improve the flexural strength of concrete, and the increase range is 22%~62%, The flexural strength of the corrugated steel fiber has a greater contribution to the flexural strength of the concrete specimen than the ultra short superfine steel fiber. After the peak of the load deflection curve of the hybrid steel fiber polymer modified concrete, there will be a distinct dentate shape. The larger sawtooth on the curve is pulled out of a root corrugated steel fiber, and the large serrated section indicates that the steel fiber is pulled out. When the corresponding steel fiber is pulled out, the bearing capacity is reduced. The hybrid steel fiber polymer modified concrete has excellent deformation ability, and the ultimate tensile strain is 4-6 times of that of the plain concrete. The composite steel fiber concrete has greater fracture toughness and fracture energy and better fracture energy. In the ductility, the increase of fracture toughness is 5.3%~33.8%, the increase of fracture energy is 9.8%~107.2%. with the increase of the volume of steel fiber, the initial cracking of the mixed steel fiber polymer modified concrete, the increase of the impact times, the increase of the impact toughness of the concrete, and the main crack from one to many. Mixed steel fiber polymer modified concrete has better resistance to high temperature, high temperature and water, sulphate resistance and frost resistance. The flexural strength of hybrid steel fiber polymer concrete at 60 C is higher than that at normal temperature. The increase is that the flexural strength of 0.88%~8.78%. hybrid steel fiber polymer coagulant soil is maintained at 60 degrees centigrade for 28 days and the flexural strength is more than normal. The maintenance has declined, but the decline is small.
【學(xué)位授予單位】：重慶交通大學(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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