【摘要】：瀝青路面松散破壞有兩種表現(xiàn)類型。一是長期使用過程中逐漸發(fā)生的松散,例如水穩(wěn)定性不足導(dǎo)致的瀝青混合料松散;二是成型初期就表現(xiàn)出的松散,例如抗輪胎“擰搓”作用能力不足導(dǎo)致的混合料松散。現(xiàn)階段對松散破壞的研究大多局限于前者而對瀝青混合料初始的抗松散性能沒有正確認(rèn)識(shí),并且缺少有效的預(yù)防、評價(jià)以及治理措施。因此對瀝青混合料松散破壞進(jìn)行系統(tǒng)的研究意義重大。本論文對瀝青混合料松散破壞的機(jī)理進(jìn)行了研究。水穩(wěn)定不足導(dǎo)致的松散主要是水和荷載的同時(shí)作用,使得瀝青膠結(jié)能力逐漸減弱乃至喪失而導(dǎo)致的,其松散破壞模式主要側(cè)重于粘附破壞;抗輪胎“擰搓”能力不足導(dǎo)致的混合料松散是因?yàn)闉r青混合料初始的抗松散能力不足,輪胎復(fù)雜的“擰搓”作用使得表層和內(nèi)部互相嵌擠的集料之間發(fā)生擾動(dòng),破壞了膠結(jié)作用,甚至有些集料被碾碎產(chǎn)生了許多新的沒有膠結(jié)料粘結(jié)的接觸面,其松散破壞模式側(cè)重于粘聚破壞和碎裂破壞。為了更好的區(qū)分和評價(jià)不同瀝青混合料的抗松散性能,對瀝青混合料松散破壞的評價(jià)方法進(jìn)行研究。對于現(xiàn)階段能較為直觀評價(jià)瀝青混合料松散的肯塔堡飛散試驗(yàn)進(jìn)行了改進(jìn)。建議在原常規(guī)飛散試驗(yàn)的基礎(chǔ)上增加十個(gè)鋼球以加強(qiáng)區(qū)分度,減小結(jié)果離散性。在模擬實(shí)際輪胎對瀝青道面“擰搓”作用的基礎(chǔ)上,研發(fā)了一種全新的“擰搓”作用試驗(yàn)儀以及相應(yīng)的評價(jià)方法來評價(jià)不同瀝青混合料的抗松散性能并申請了發(fā)明專利。兩種試驗(yàn)方法相結(jié)合可以對瀝青混合料的抗松散性能進(jìn)行全面評價(jià)�；凇皵Q搓”損失表征不同瀝青混合料的抗松散性能,對影響瀝青混合料松散破壞的因素進(jìn)行了研究。不同瀝青種類對應(yīng)混合料的抗松散性能不同,在一定條件下隨著瀝青標(biāo)號(hào)的變大“擰搓”損失變大;瀝青輕組分含量的增加也會(huì)導(dǎo)致“擰搓”損失變大;不同級配類型對松散破壞影響不同,開級配瀝青混合料容易產(chǎn)生“擰搓”松散破壞,密實(shí)級配在高溫條件下也容易產(chǎn)生“擰搓”松散破壞;集料的巖性、施工與養(yǎng)護(hù)等等都會(huì)對松散破壞產(chǎn)生重大影響。最終針對瀝青混合料松散破壞的特點(diǎn),對瀝青道面抗松散破壞配合比設(shè)計(jì)方法進(jìn)行了研究,對其適用范圍、設(shè)計(jì)指標(biāo)、設(shè)計(jì)程序給出了合理的建議。
[Abstract]:There are two types of loose damage of asphalt pavement. One is the looseness of asphalt mixture caused by the lack of water stability, the other is the looseness of the asphalt mixture in the early stage of forming, such as the loose mixture caused by the insufficient ability of anti-tire "twisting" action. At present, most of the researches on loose damage are limited to the former, but the initial anti-loose performance of asphalt mixture is not correctly understood, and the effective prevention, evaluation and treatment measures are lacking. Therefore, it is of great significance to study the loose damage of asphalt mixture systematically. In this paper, the loose failure mechanism of asphalt mixture is studied. The looseness caused by insufficient water stability is mainly caused by the simultaneous action of water and load, which leads to the gradual weakening and even loss of asphalt cementing ability, and its loose failure mode is mainly focused on the adhesion failure. The looseness of the mixture caused by the insufficient "twisting" ability of the anti-tire is due to the lack of the initial anti-loosening ability of the asphalt mixture, and the complex "twisting" of the tire causes the disturbance between the surface layer and the inner interlocking aggregate. Even some aggregates are crushed to produce many new unbonded contact surfaces, and the loose failure mode focuses on the cohesive failure and fragmentation failure. In order to distinguish and evaluate the looseness resistance of different asphalt mixture, the evaluation method of loose damage of asphalt mixture is studied. The Kentucky Flying Test, which can directly evaluate the loose asphalt mixture at present, is improved. It is suggested that ten steel balls should be added on the basis of the original conventional flying test to strengthen the differentiation and reduce the dispersion of the results. On the basis of simulating the "twisting" effect of tire on asphalt pavement, a new "twist rubbing" test instrument and corresponding evaluation method are developed to evaluate the anti-loose performance of different asphalt mixtures and to apply for the invention patent. The combination of two test methods can comprehensively evaluate the anti-loose performance of asphalt mixture. Based on the "twisting" loss, the factors affecting the loose failure of asphalt mixture were studied. The looseness resistance of the mixture is different according to different kinds of asphalt. Under certain conditions, with the increase of asphalt grade, the "twist" loss becomes larger, and the increase of the content of light component of asphalt will lead to the "twist" loss. Different gradation types have different influence on loose failure, open gradation asphalt mixture is easy to produce "twist rubbing" loose damage, dense gradation is also easy to produce "twist rub" loose damage under high temperature condition. The lithology, construction and maintenance of aggregate have great influence on loose damage. Finally, according to the characteristics of asphalt mixture loose damage, the design method of asphalt pavement anti-loose failure mix ratio is studied, and reasonable suggestions are given on its application scope, design index and design program.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

【參考文獻(xiàn)】

中國期刊全文數(shù)據(jù)庫 前3條

1 黃學(xué)文;;大空隙瀝青混合料的耐久性研究[J];中外公路;2013年04期

2 耿韓;李立寒;孟慶楠;;大空隙率瀝青混合料耐久性評價(jià)方法與指標(biāo)[J];建筑材料學(xué)報(bào);2011年06期

3 李娜;韓森;王海峰;;瀝青混合料抗剪強(qiáng)度參數(shù)影響因素分析研究[J];武漢理工大學(xué)學(xué)報(bào);2010年01期

中國碩士學(xué)位論文全文數(shù)據(jù)庫 前4條

1 肖月;瀝青混合料中膠漿—集料粘結(jié)性及力學(xué)性能研究[D];武漢理工大學(xué);2008年

2 王元元;表面能在評價(jià)瀝青與集料粘附性中的應(yīng)用研究[D];重慶交通大學(xué);2012年

3 劉兵;新疆地區(qū)半剛性基層瀝青路面病害成因分析[D];長安大學(xué);2013年

4 張?jiān)?瀝青與集料界面粘附性研究[D];長安大學(xué);2014年

，

本文編號(hào)：2311875