【摘要】：近年來(lái)，廣西地區(qū)大多數(shù)瀝青路面都進(jìn)入了大中修階段，這些路面在開挖的過(guò)程中，必然會(huì)產(chǎn)生大量的廢棄路面材料，舊水泥穩(wěn)定碎石基層材料是一種具有較高的強(qiáng)度和剛度，抗凍性和水穩(wěn)定性都良好，但是抗開裂性能比較差，如何對(duì)這種材料的再生利用，成為了道路科研人員和工程人員必須解決的問(wèn)題。 本文主要研究了水泥、乳化瀝青、水泥乳化瀝青、水泥粉煤灰四種再生方法再生舊水泥穩(wěn)定碎石基層材料，通過(guò)對(duì)舊料的篩分確定了新料摻配比例為20%左右，通過(guò)旋轉(zhuǎn)擊實(shí)實(shí)驗(yàn)確定再生混合料的最大干密度和最佳含水率，研究了在最佳含水量和最大干密度下各種再生方法的再生混合料的無(wú)側(cè)限抗壓強(qiáng)度、劈裂強(qiáng)度、凍融劈裂強(qiáng)度等力學(xué)性能，研究發(fā)現(xiàn)水泥再生混合料中水泥最佳摻量為5%，乳化瀝青再生混合料中乳化瀝青最佳摻量為7.5%，并分析其強(qiáng)度隨齡期、水泥摻量或乳化瀝青摻量的變化規(guī)律，通過(guò)對(duì)水泥乳化瀝青再生混合料進(jìn)行了正交實(shí)驗(yàn)，發(fā)現(xiàn)水泥乳化瀝青再生混合料的強(qiáng)度主要是由水泥這部分決定的，乳化瀝青的摻入對(duì)再生混合料強(qiáng)度影響不大，但可以增加再生混合料的柔性，，減少收縮開裂。同時(shí)研究了在水泥摻量為4%條件下水泥粉煤灰再生混合料的最佳配合比為4:10:86，發(fā)現(xiàn)了一定量的粉煤灰可以提高再生混合料的強(qiáng)度，通過(guò)SEM分析了各種再生方法的強(qiáng)度形成機(jī)理，對(duì)這幾種再生方法效果綜合評(píng)價(jià)，認(rèn)為水泥粉煤灰與水泥乳化瀝青再生方法在改善舊水泥穩(wěn)定碎石基層材料性能中效果比較好，可以在工程中采用。 最后，本文研究了再生舊水泥穩(wěn)定碎石混合料基層施工方法包括廠拌再生利用、就地再生利用以及多錘頭就地破碎再生利用，以及它們的適用范圍、施工工藝與質(zhì)量控制，通過(guò)對(duì)廣西地區(qū)瀝青路面的交通量、路面材料使用情況、結(jié)構(gòu)形式進(jìn)行調(diào)查，總結(jié)出了原瀝青路面五種基本結(jié)構(gòu)，針對(duì)這五種瀝青路面基本結(jié)構(gòu)進(jìn)行半剛性基層再生并使用軟件HPDS2006計(jì)算每種瀝青路面結(jié)構(gòu)層厚度，得出了不同瀝青路面半剛性基層再生典型結(jié)構(gòu)，為以后半剛性基層再生利用的施工技術(shù)提供了一定的參考價(jià)值。
[Abstract]:In recent years, most asphalt pavements in Guangxi have entered the stage of major and medium repair. During the excavation of these pavements, a large number of abandoned pavement materials will inevitably be produced. The old cement stabilized macadam base material is a kind of high strength and stiffness. The frost resistance and water stability are good, but the cracking resistance is poor. How to recycle this material has become a problem that road researchers and engineers must solve. In this paper, four regenerative methods of cement, emulsified asphalt and cement fly ash are studied to regenerate the old cement stabilized macadam base materials. The proportion of new materials is about 20% by screening the old materials. The maximum dry density and optimum moisture content of recycled mixture were determined by rotating compaction test. The unconfined compressive strength and splitting strength of recycled mixture were studied under the optimum moisture content and maximum dry density. The mechanical properties such as freezing and thawing splitting strength are studied. It is found that the optimum content of cement in cement recycled mixture is 5, and the optimum amount of emulsified asphalt in emulsified asphalt recycled mixture is 7.5. The strength of recycled mixture is analyzed with age. Through orthogonal experiment of cement emulsified asphalt recycled mixture, it is found that the strength of cement emulsified asphalt recycled mixture is mainly determined by cement. The mixing of emulsified asphalt has little effect on the strength of recycled mixture, but it can increase the flexibility of recycled mixture and reduce shrinkage cracking. At the same time, the optimum mix ratio of cement fly ash recycled mixture is 4: 10: 86 under the condition of cement content of 4%. It is found that a certain amount of fly ash can improve the strength of recycled mixture, and the strength forming mechanism of various regeneration methods is analyzed by SEM. According to the comprehensive evaluation of the effects of these regeneration methods, it is considered that the regeneration method of cement fly ash and cement emulsified asphalt is better in improving the properties of the old cement stabilized macadam base material, and can be used in engineering. Finally, this paper studies the construction methods of recycled old cement stabilized macadam mixture base, including reclaimed utilization of factory mix, in-situ recycling and local crushing and recycling of multi-hammer head, as well as their applicable scope, construction technology and quality control. Through the investigation of the traffic volume, the use of pavement materials and the structure form of asphalt pavement in Guangxi, five basic structures of the original asphalt pavement are summarized. According to the five kinds of asphalt pavement basic structure, the semi-rigid base course is regenerated, and the thickness of each asphalt pavement structure layer is calculated by using the software HPDS2006, and the typical regenerative structure of different asphalt pavement semi-rigid base course is obtained. It provides a certain reference value for the construction technology of regeneration and utilization of semi-rigid base.
【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】：2014
【分類號(hào)】：U416.2

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