本文選題：改性橡膠混凝土 + 配制方法��； 參考：《鄭州大學(xué)》2015年碩士論文

【摘要】：通過改性劑處理橡膠顆粒,能夠增強(qiáng)橡膠顆粒與水泥石的粘結(jié)作用,提高橡膠混凝土的各項(xiàng)性能。前期試驗(yàn)成果顯示,改性橡膠混凝土具有良好的抗凍性,在水利工程中有較好的應(yīng)用前景,但對其強(qiáng)度等力學(xué)性能的研究尚不完善。因此,本文在水利公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(201301027)的資助下,對改性橡膠混凝土的配制方法和物理力學(xué)性能進(jìn)行了研究。主要工作和結(jié)論如下:(1)研究了改性橡膠混凝土的配制方法。首先對項(xiàng)目的強(qiáng)度目標(biāo)進(jìn)行分析,得到改性橡膠混凝土配合比的確定原則:使基準(zhǔn)橡膠混凝土與基準(zhǔn)混凝土的強(qiáng)度比為0.71~0.83。然后根據(jù)不同橡膠粒徑和摻量的橡膠混凝土的坍落度和強(qiáng)度試驗(yàn),確定了改性橡膠混凝土的配合比。最后根據(jù)已有的試驗(yàn)成果,確定了橡膠混凝土的3種改性方式:Na OH改性、KH570改性和復(fù)合改性。(2)試驗(yàn)研究了改性橡膠混凝土的拌和物性能,發(fā)現(xiàn)改性橡膠混凝土較基準(zhǔn)橡膠混凝土拌和物密度下降、坍落度升高。Na OH改性橡膠混凝土、KH570改性橡膠混凝土和復(fù)合改性橡膠混凝土的拌和物密度下降的幅度分別為0.59%、3.1%、2.3%,坍落度上升的幅度分別為24.4%、75.6%、70.7%。(3)試驗(yàn)研究了改性橡膠混凝土的強(qiáng)度。結(jié)果顯示,Na OH改性橡膠混凝土和復(fù)合改性橡膠混凝土的強(qiáng)度較基準(zhǔn)橡膠混凝土稍有下降,其中Na OH改性橡膠混凝土的28d立方體抗壓強(qiáng)度、劈拉強(qiáng)度和軸壓強(qiáng)度分別為基準(zhǔn)橡膠混凝土的94.9%、98.8%和95.1%,復(fù)合改性橡膠混凝土分別為基準(zhǔn)橡膠混凝土的88.5%、93.4%和90.9%。KH570改性橡膠混凝土的強(qiáng)度與基準(zhǔn)橡膠混凝土相當(dāng),其分別為基準(zhǔn)橡膠混凝土的100.3%、98.4%和102.7%。分析認(rèn)為,改性劑在增強(qiáng)橡膠顆粒與水泥石粘結(jié)作用的同時(shí)會削弱混凝土的密實(shí)性。(4)試驗(yàn)研究了改性橡膠混凝土的應(yīng)力應(yīng)變特性,采用過鎮(zhèn)海的混凝土本構(gòu)模型擬合了改性橡膠混凝土的本構(gòu)方程,理論公式與試驗(yàn)結(jié)果吻合較好。與普通橡膠混凝土相比,改性橡膠混凝土峰值應(yīng)變增加、彈性模量下降。Na OH改性橡膠混凝土、KH570改性橡膠混凝土和復(fù)合改性橡膠混凝土的峰值應(yīng)變提高的幅度分別為19.7%、0.5%和9.8%,彈性模量下降的幅度分別為13.5%、3.3%和10.2%。
[Abstract]:By treating rubber particles with modifier, the bond between rubber particles and cement stone can be strengthened, and the properties of rubber concrete can be improved. The preliminary test results show that the modified rubber concrete has good frost resistance and has a good application prospect in water conservancy projects, but the study on its strength and other mechanical properties is not perfect. Therefore, the preparation method and physical and mechanical properties of modified rubber concrete are studied in this paper, supported by the special research project of water conservancy and public welfare industry (201301027). The main work and conclusion are as follows: 1) the preparation method of modified rubber concrete is studied. Firstly, the strength target of the project is analyzed, and the principle of determining the mix ratio of modified rubber concrete is obtained: the strength ratio of the standard rubber concrete to the standard concrete is 0.71g 0.83. Then according to the slump and strength test of rubber concrete with different rubber particle size and content, the mix ratio of modified rubber concrete was determined. Finally, according to the existing experimental results, three kinds of modification methods of rubber concrete were determined, that is, the modification of KH 570 and the modification of KH 570 and compound modification of rubber concrete. The mixing properties of modified rubber concrete were studied. It is found that the density of the modified rubber concrete is lower than that of the reference rubber concrete. The strength of modified rubber concrete was studied by means of increasing slump. NaOH modified rubber concrete and compound modified rubber concrete. The decrease range of mixing density was 0.59 and 3.1and 2.3.The slump increased by 24.45.6and 70.7. The results showed that the strength of Na-OH modified rubber concrete and compound modified rubber concrete was slightly lower than that of reference rubber concrete, and the 28d cube compressive strength of NaOH modified rubber concrete was found. The splitting tensile strength and axial compression strength of the standard rubber concrete are 94.998% and 95.1% of the standard rubber concrete, respectively. The composite modified rubber concrete is 88.593 4% of the reference rubber concrete and the strength of the 90.9%.KH570 modified rubber concrete is the same as that of the reference rubber concrete. It is 98.4% of the standard rubber concrete and 102.7% of the standard rubber concrete. The analysis shows that the modifier can weaken the compactness of concrete while reinforcing the bond between rubber particles and cement stone. The stress-strain characteristics of modified rubber concrete are studied. The constitutive equation of modified rubber concrete is fitted by using the constitutive model of concrete over Zhenhai. The theoretical formula is in good agreement with the experimental results. Compared with ordinary rubber concrete, the peak strain of modified rubber concrete increases. The peak strain of the modified rubber concrete and the composite modified rubber concrete were increased by 19.7% and 9.8%, respectively, and the decrease of the elastic modulus were 13.5% and 10.2%, respectively.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

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本文編號：1816506