本文選題：熱再生 + 半圓彎曲試驗(yàn)　； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：瀝青路面熱再生技術(shù),能夠提高資源利用效率,減小損失浪費(fèi),保護(hù)環(huán)境,以盡可能少的資源消耗,創(chuàng)造盡可能大的經(jīng)濟(jì)社會效益,所以它在公路瀝青路面的養(yǎng)護(hù)中得到越來越廣泛的應(yīng)用。目前,出于對熱再生技術(shù)的可行性和可靠性,尤其是再生瀝青路面的耐久性能的擔(dān)憂,瀝青路面熱再生技術(shù)未得到大規(guī)模推廣應(yīng)用�；诖�,本文通過室內(nèi)試驗(yàn),對不同RAP料摻量的熱再生瀝青混合料的耐久性能進(jìn)行評價,希望對我國瀝青路面熱再生技術(shù)評價體系和指標(biāo)的建立提供一些參考。首先,本文對研究所用的舊料進(jìn)行了研究：通過抽提篩分得到舊料的級配組成和油石比；為了保證再生料配合比設(shè)計時舊料的均勻性,將舊料分為了粗細(xì)兩檔進(jìn)行處理；對回收得到的舊瀝青性能進(jìn)行了評價,選取現(xiàn)有的再生劑對舊瀝青進(jìn)行了再生研究,發(fā)現(xiàn)3%摻量的再生劑可以將老化瀝青的性能指標(biāo)恢復(fù)至與原樣瀝青接近的程度；應(yīng)用馬歇爾配合比設(shè)計方法對再生混合料進(jìn)行了設(shè)計。其次,總結(jié)了現(xiàn)有的疲勞性能室內(nèi)評價試驗(yàn)方法,選取半圓彎曲試驗(yàn)作為本文的疲勞試驗(yàn)評價方法,確定了其參數(shù)。應(yīng)用半圓彎曲疲勞試驗(yàn)評價了不同RAP料摻量熱再生瀝青混合料在單級等幅荷載作用下的疲勞性能,采用數(shù)字圖像技術(shù)對試驗(yàn)中的疲勞裂紋開展過程進(jìn)行了觀測,分別采用裂紋擴(kuò)展速率和疲勞斷裂能評價了熱再生瀝青混合料的疲勞性能。結(jié)果表明,熱再生混合料的裂紋擴(kuò)展速率快于新瀝青混合料,且隨著RAP料摻量的增加,裂紋擴(kuò)展速率越快。熱再生混合料的單次疲勞破裂能大于新瀝青混合料,而總疲勞破裂能小于新瀝青混合料,因此熱再生混合料的疲勞性能不如新瀝青混合料。接著,通過不同加載方式的多級等幅荷載下的疲勞試驗(yàn)對不同RAP料摻量的熱再生瀝青混合料的疲勞性能進(jìn)行了評價。研究表明：瀝青混合料在應(yīng)力控制多級等幅荷載下,疲勞損傷據(jù)Miner法則線性累積,損傷因子都大于1,說明多級荷載下的疲勞損傷演化呈非線性。30%舊料摻量的熱再生瀝青混合料有著與新瀝青混合料相似甚至更好的疲勞性能,但當(dāng)RAP料摻量進(jìn)一步增加時,熱再生料的疲勞性能下降明顯,為了保證熱再生混合料的疲勞性能,應(yīng)限制其舊料摻量。再次,基于凍融循環(huán)條件應(yīng)用劈裂試驗(yàn)、動態(tài)模量試驗(yàn)、動態(tài)蠕變試驗(yàn)和半圓劈裂試驗(yàn)全面評價了不同RAP料摻量的熱再生瀝青混合料的強(qiáng)度、高溫性能和低溫性能,分析了評價方法和RAP料摻量對熱再生混合料性能的影響。最后,綜合疲勞性能和水穩(wěn)定性能兩方面的研究,本文認(rèn)為：為了保證熱再生瀝青混合料的耐久性能,當(dāng)采用只具有軟化效果類型的再生劑時,其舊料摻量不宜超過30%。
[Abstract]:The technology of asphalt pavement thermal regeneration can improve the efficiency of resource utilization, reduce the loss and waste, protect the environment, consume as little resources as possible, and create as much economic and social benefits as possible. So it is more and more widely used in the maintenance of highway asphalt pavement. At present, due to the concern about the feasibility and reliability of thermal regeneration technology, especially the durability of recycled asphalt pavement, the thermal recycling technology of asphalt pavement has not been popularized and applied on a large scale. Based on this, this paper evaluates the durability of hot recycled asphalt mixture with different RAP content through laboratory test, hoping to provide some references for the establishment of evaluation system and index of asphalt pavement thermal regeneration technology in China. First of all, this paper studies the old materials used in the research: the gradation composition and the oil stone ratio of the old materials are obtained by extracting and sieving, in order to ensure the uniformity of the old materials in the design of the mixture ratio of the recycled materials, the used materials are divided into two stages of thickness for treatment. The performance of the recycled old asphalt was evaluated and the existing regenerating agent was selected to study the regeneration of the old asphalt. It was found that the performance index of the aged asphalt could be restored to the same degree as the original asphalt with the addition of 3% of the regenerating agent. The recycled mixture was designed by Marshall mixture design method. Secondly, the existing indoor fatigue performance evaluation methods are summarized, and the semi-circular bending test is selected as the fatigue test evaluation method in this paper, and its parameters are determined. In this paper, the fatigue performance of heat regenerated asphalt mixture with different RAP content was evaluated by semi-circular bending fatigue test, and the fatigue crack development process was observed by digital image technique. The fatigue performance of hot recycled asphalt mixture was evaluated by crack growth rate and fatigue fracture energy. The results show that the crack growth rate of hot recycled mixture is faster than that of new asphalt mixture, and the faster the crack growth rate is with the increase of RAP content. The single fatigue rupture of the hot recycled mixture is greater than that of the new asphalt mixture, and the total fatigue rupture energy is lower than that of the new asphalt mixture, so the fatigue performance of the hot recycled mixture is inferior to that of the new asphalt mixture. Then, the fatigue performance of hot regenerated asphalt mixture with different RAP content was evaluated by the fatigue test of different loading modes under multistage and equal amplitude loads. The results show that the fatigue damage of asphalt mixture accumulates linearly according to the Miner rule under the stress controlled multistage constant amplitude load. The damage factors are all greater than 1, which indicates that the fatigue damage evolution of hot-regenerated asphalt mixture with a nonlinear content of .30% used material under multistage load has similar or even better fatigue performance than that of new asphalt mixture, but when the content of RAP mixture increases further, the fatigue performance of the mixture is similar to that of the new asphalt mixture. The fatigue performance of hot recycled mixture is obviously decreased. In order to ensure the fatigue performance of hot recycled mixture, the amount of used material should be limited. Thirdly, based on the freezing and thawing cycle conditions, the strength, high temperature and low temperature properties of different RAP mixtures are evaluated by splitting test, dynamic modulus test, dynamic creep test and semi-circular splitting test. The influence of evaluation method and RAP content on the performance of hot recycled mixture is analyzed. Finally, in order to ensure the durability of hot recycled asphalt mixture, it is concluded that in order to ensure the durability of hot recycled asphalt mixture, the amount of the old mixture should not exceed 30% when the recycled agent with only softening effect is used.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 徐勛倩;黃衛(wèi);吳國慶;;基于損傷-斷裂力學(xué)的鋼橋面鋪裝體系疲勞特性研究[J];公路交通科技;2006年04期

2 王抒音,譚憶秋,包秀寧,王哲人;用凍融循環(huán)劈裂比評價瀝青混合料抗水損害能力[J];哈爾濱建筑大學(xué)學(xué)報;2002年05期

3 張宏超,孫立軍;瀝青混合料水穩(wěn)定性能全程評價方法研究[J];同濟(jì)大學(xué)學(xué)報(自然科學(xué)版);2002年04期

4 趙少汴;常用累積損傷理論疲勞壽命估算精度的試驗(yàn)研究[J];機(jī)械強(qiáng)度;2000年03期

5 鞠楊,樊承謀;鋼纖維混凝土的疲勞“鍛煉效應(yīng)”[J];土木工程學(xué)報;1995年03期

相關(guān)博士學(xué)位論文 前7條

1 苑苗苗;基于數(shù)字散斑相關(guān)方法的瀝青混合料疲勞破壞機(jī)理研究[D];華南理工大學(xué);2013年

2 張順先;基于使用性能的鋼橋面鋪裝環(huán)氧瀝青混合料設(shè)計研究與疲勞壽命預(yù)測[D];華南理工大學(xué);2013年

3 劉宏富;基于強(qiáng)度與剛度衰變的瀝青混合料非線性疲勞損傷特性研究[D];長沙理工大學(xué);2012年

4 陳靜云;瀝青路面再生方法的試驗(yàn)研究[D];大連理工大學(xué);2011年

5 耿九光;瀝青老化機(jī)理及再生技術(shù)研究[D];長安大學(xué);2009年

6 謝濤;基于CT實(shí)時觀測的瀝青混合料裂紋擴(kuò)展行為研究[D];西南交通大學(xué);2006年

7 周志剛;交通荷載下瀝青類路面疲勞損傷開裂研究[D];中南大學(xué);2003年

相關(guān)碩士學(xué)位論文 前1條

1 孔令然;就地?zé)嵩偕鸀r青混合料耐久性研究[D];大連理工大學(xué);2010年

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