【摘要】：廢舊輪胎數(shù)量逐年增加,屬于一種工業(yè)廢棄物。所以廢舊輪胎處理及再利用成為各國(guó)亟待解決的問(wèn)題。已有研究表明,將廢舊輪胎粉碎摻入水泥混凝土中,可以改善混凝土的性能。本文將廢舊輪胎加工成粒徑小于5mm的顆粒,按一定的比例替代等體積的砂子配制成膠�；炷�。采用了不同水灰比,不同膠粒摻量,不同膠粒粒徑,三因素三水平的正交試驗(yàn)方案。通過(guò)試拌,成型,養(yǎng)護(hù),探討了28天齡期的不同水灰比,不同膠粒摻量,不同膠粒粒徑的膠�；炷恋牧W(xué)性能、彈性模量及抗沖磨強(qiáng)度;及各因素對(duì)其的影響關(guān)系。研究結(jié)果表明,橡膠顆粒摻入降低了膠�；炷恋目箟簭�(qiáng)度、劈裂強(qiáng)度均低于基準(zhǔn)試件相應(yīng)的抗壓強(qiáng)、劈裂強(qiáng)度。通過(guò)試驗(yàn)結(jié)果可以發(fā)現(xiàn)橡膠顆粒摻量變化對(duì)強(qiáng)度降低的影響程度大于橡膠顆粒粒徑變化產(chǎn)生的影響;同一種粒徑下,膠�；炷�28d齡期抗壓強(qiáng)度、劈裂強(qiáng)度隨橡膠顆粒摻量的增加均表現(xiàn)出降低的趨勢(shì);在橡膠顆粒摻量相同情況下,膠�；炷�28d齡期抗壓強(qiáng)度、劈裂強(qiáng)度均隨橡膠顆粒粒徑的減小而降低�；炷恋暮瑲饬侩S膠粒摻量的增加而顯著增加,而且膠粒顆粒的粒徑越小,混凝土含氣量增加的幅度越大;混凝土的彈性模量相對(duì)于基準(zhǔn)混凝土明顯降低;膠�；炷�28d彈性模量受膠粒摻量的影響最大,且隨著膠粒摻量增加而降低。水灰比與膠�；炷恋目箾_磨強(qiáng)度具有良好關(guān)系,水灰比小時(shí),有利于提高混凝土的耐磨性,但是水灰比不能無(wú)限制的降低,必須能夠提供膠凝材料完全水化所需的水分及保證施工過(guò)程中的和易性;隨著橡膠顆粒摻量的增加,混凝土的耐磨性先提高后降低。橡膠摻量15%時(shí)混凝土的抗沖磨強(qiáng)度最高,當(dāng)摻量達(dá)到30%時(shí),抗沖磨強(qiáng)度反而比未摻入時(shí)低;摻入的三種粒徑中摻入粒徑為(2.36-4.75mm)的混凝土耐磨性能最佳,其單位磨損量最小。
[Abstract]:The waste tire quantity increases year by year, belongs to one kind of industrial waste. Therefore, waste tire treatment and reuse has become an urgent problem in various countries. It has been shown that the performance of cement concrete can be improved by grinding waste tires into cement concrete. In this paper, the waste tire is processed into particles with diameter less than 5mm, and the equal volume of sand is replaced by a certain proportion to form concrete. The orthogonal experimental scheme with different water-cement ratio, different content of rubber particles, different particle size and three factors and three levels was adopted. Through trial mixing, molding and curing, the mechanical properties, elastic modulus and impact wear strength of concrete with different water / cement ratio, different amount of rubber particles and different particle sizes of 28 days were discussed, as well as the influence of various factors on it. The results show that the compressive strength of the concrete is decreased with the addition of rubber particles, and the splitting strength is lower than the corresponding compressive strength and splitting strength of the standard specimen. It is found that the influence of rubber particle content on strength reduction is greater than that of rubber particle size change. Under the same particle size, the compressive strength and splitting strength of concrete at 28 d age decreased with the increase of rubber particle content. Under the condition of the same amount of rubber particles, the compressive strength and splitting strength of concrete at 28 d age decreased with the decrease of rubber particle size. The air content of concrete increases significantly with the increase of the content of rubber particles, and the smaller the particle size, the larger the increase of air content of concrete, and the lower the elastic modulus of concrete is compared with the standard concrete, the smaller the particle size is, the larger the increase of air content in concrete is. The elastic modulus of grained concrete is the most affected by the content of colloidal particles in 28 days, and decreases with the increase of the content of rubber particles. The water-cement ratio has a good relationship with the impact and wear strength of the concrete. The low water-cement ratio can improve the wear resistance of concrete, but the water-cement ratio can not be reduced indefinitely. Must be able to provide the moisture required for the complete hydration of the cementitious material and ensure ease during construction; With the increase of rubber particle content, the wear resistance of concrete first increases and then decreases. The anti-wear strength of concrete is the highest when the rubber content is 15 and when it reaches 30%, the anti-wear strength of concrete is lower than that of the unadulterated concrete. The wear resistance of concrete mixed with 2.36-4.75mm is the best and the unit wear is the smallest.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

【共引文獻(xiàn)】

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