本文關(guān)鍵詞：混雜纖維混凝土基本力學(xué)性能與板件的抗爆性能研究　出處：《廣西大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混雜纖維混凝土 PVA纖維 韌性 玄武巖纖維 板 抗爆

【摘要】：混凝土作為一種多相材料,在受力前就存在著微裂縫,而在混凝土中添加纖維有助于改善這一缺陷。相對(duì)于單摻纖維混凝土,將不同品質(zhì)、不同幾何形態(tài)的纖維混摻入混凝土中,可以從不同層次上改善纖維分布的均衡性,提高增強(qiáng)效率。本文通過(guò)實(shí)驗(yàn)的手段,研究鋼纖維-PVA纖維混雜、鋼纖維-玄武巖纖維混雜的混凝土基本力學(xué)性能與抗爆性能。通過(guò)立方體抗壓試驗(yàn)、劈裂抗拉試驗(yàn)、彎曲韌性試驗(yàn)以及混雜纖維混凝土板的接觸爆炸試驗(yàn),探討不同纖維摻量對(duì)混凝土性能的影響。其中,鋼纖維摻量取3個(gè)體積率:0.5%、1%、2%,PVA纖維摻量取3個(gè)體積率:0.05%、0.1%、0.15%,玄武巖纖維摻量取1個(gè)體積率:0.1%,共12組配合比。得到結(jié)論如下:(1)在混凝土中加入不同纖維對(duì)混凝土的抗壓強(qiáng)度影響不大�；祀s纖維混凝土受壓破壞后呈多縫開(kāi)裂的形態(tài)。鋼纖維摻量對(duì)抗壓強(qiáng)度起主要的影響作用。在鋼纖維摻量較大(2%)時(shí),抗壓強(qiáng)度提高約20%左右。當(dāng)鋼纖維摻量較低(0.5%～1%)時(shí),混雜纖維混凝土的抗壓強(qiáng)度比之素混凝土?xí)鄬?duì)降低。在混凝土中加入玄武巖纖維對(duì)混雜纖維混凝土的抗壓強(qiáng)度幾乎沒(méi)有影響。(2)混雜纖維可以提高混凝土的抗拉強(qiáng)度,提高約23%～103%。對(duì)提高混雜纖維混凝土抗拉強(qiáng)度起主要作用的纖維是鋼纖維。在低鋼纖維摻量(0.5%)的情況下,混雜纖維混凝土的抗拉強(qiáng)度可以至少提高20%。(3)在混凝土中加入混雜纖維對(duì)提高混凝土的初裂強(qiáng)度、極限抗彎承載力、彎曲韌性有利。最為明顯的是,在素混凝土中加入混雜纖維可將彎曲韌性提高約6～15倍。隨著鋼纖維摻量的增加,彎曲韌性也增加,隨著PVA纖維摻量的增加,彎曲韌性先減后增,但基本在一定范圍內(nèi)浮動(dòng)。玄武巖纖維的表現(xiàn)沒(méi)有優(yōu)于或劣于PVA纖維。(4)混雜纖維可以改善混凝土的脆性性質(zhì),表現(xiàn)在纖維的存在可以增大混凝土的拉壓比。隨著鋼纖維摻量的增加,拉壓比增加,隨著PVA纖維摻量的增加,拉壓比也增大。摻入玄武巖纖維的混雜纖維混凝土在鋼纖維摻量為1%與2%時(shí),拉壓比相差無(wú)幾。(5)與普通鋼筋混凝土板相比,混雜纖維鋼筋混凝土板的抗爆能力較好,尤其體現(xiàn)在背爆面的震塌情況上。用破壞系數(shù)Ka、Kb來(lái)表示混雜纖維鋼筋混凝土板的抗爆能力時(shí),當(dāng)短纖維的摻量低時(shí)(PVA纖維0.05%或BF0.1%),在鋼纖維低摻量區(qū)(1%)提高鋼纖維摻量對(duì)增強(qiáng)混雜纖維混凝土的抗爆能力效果明顯。而當(dāng)短纖維的摻量高時(shí)(PVA纖維0.1%～0.15%),在鋼纖維高摻量區(qū)(1%)提高鋼纖維摻量對(duì)增強(qiáng)混雜纖維混凝土的抗爆能力效果更明顯。
[Abstract]:As a multi-phase material, concrete has micro cracks before force, and the addition of fiber in concrete helps to improve this defect. Compared with single fiber reinforced concrete, mixing fibers with different quality and geometric shapes can improve the equilibrium of fiber distribution and enhance efficiency at different levels. In this paper, the basic mechanical properties and anti explosion properties of steel fiber -PVA fiber hybrid, steel fiber - basalt fiber hybrid concrete are studied by means of experimental methods. Through cube compression test, splitting tensile test, flexural toughness test and contact explosion test of hybrid fiber reinforced concrete plate, the influence of different fiber content on the performance of concrete is discussed. Among them, the volume fraction of steel fiber is 3 volume rate: 0.5%, 1% and 2%, and the volume fraction of PVA fiber is 3 volume rate: 0.05%, 0.1% and 0.15%, and the volume fraction of basalt fiber is 1 volume fraction: 0.1%, the total 12 group proportion. The conclusions are as follows: (1) the addition of different fibers in concrete has little effect on the compressive strength of concrete. The fracture of hybrid fiber concrete is multiple crack after being subjected to pressure. The content of steel fiber admixtures against the pressure degree. When the steel fiber content is larger (2%), the compressive strength is about 20%. When the amount of steel fiber is low (0.5% to 1%), the compressive strength of the hybrid fiber concrete is lower than that of the plain concrete. The addition of basalt fiber to the concrete has little effect on the compressive strength of the hybrid fiber concrete. (2) the tensile strength of concrete can be improved by hybrid fiber, which is about 23% to 103%. The fiber which plays an important role in improving the tensile strength of hybrid fiber concrete is steel fiber. In the case of low steel fiber content (0.5%), the tensile strength of hybrid fiber concrete can be increased by at least 20%. (3) adding hybrid fiber to concrete is beneficial to improve the initial crack strength, ultimate bending bearing capacity and flexural toughness of concrete. The most obvious is that adding hybrid fibers to the plain concrete can increase the flexural toughness by about 6~15 times. With the increase of steel fiber content, the flexural toughness also increases. With the increase of PVA fiber content, the flexural toughness decreases first and then increases, but it fluctuate in a certain range. The performance of basalt fiber is not superior to or inferior to PVA fiber. (4) the hybrid fiber can improve the brittle properties of concrete, which shows that the existence of fiber can increase the tensile ratio of concrete. With the increase of the amount of steel fiber, the ratio of tension and pressure increases. With the increase of the amount of PVA fiber, the ratio of tension and pressure increases. The mixed fiber reinforced concrete with basalt fiber is different when the steel fiber content is 1% and 2%. (5) compared with the ordinary reinforced concrete slab, the anti explosion ability of the hybrid fiber reinforced concrete slab is better, especially in the case of the collapse of the back surface. When using the destruction coefficient Ka and Kb to express the antiknock ability of hybrid fiber reinforced concrete slabs, when the short fiber content is low (PVA fiber 0.05% or BF0.1%), the effect of increasing the amount of steel fiber on the antiknock ability of reinforced hybrid fiber concrete is obvious in the low volume area of steel fiber (1%). When the short fiber content is high (PVA fiber 0.1% ~ 0.15%), the effect of increasing the amount of steel fiber on the antiknock ability of the hybrid fiber reinforced concrete is more obvious when the steel fiber content is high (1%).
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU528.572

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