本文關鍵詞：泡沫瀝青冷再生混合料性能與合理路面結(jié)構(gòu)研究　出處：《重慶交通大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 泡沫瀝青 發(fā)泡特性 泡沫瀝青冷再生技術 強度機理 路面結(jié)構(gòu)

【摘要】：基于節(jié)約能源、保護生態(tài)環(huán)境和瀝青路面廢舊材料再生利用的可持續(xù)發(fā)展戰(zhàn)略方針,泡沫瀝青冷再生技術作為新興“綠色”的道路維修養(yǎng)護方法,近些年越來越受到國內(nèi)外公路建設養(yǎng)護部門的重視。泡沫瀝青冷再生技術主要應用于大修改造路面結(jié)構(gòu)基層或底基層中,無論是對節(jié)能環(huán)保、降低道路維修成本,還是對路面使用性能都具有重要價值。本文依托G318線重慶市萬州區(qū)落凼至分水段路面改造工程項目,從混合料性能與合理路面結(jié)構(gòu)設計的角度對泡沫瀝青冷再生技術進行分析,力求形成完善的理論體系,為實際工程項目的應用提供指導意義。首先,本文對泡沫瀝青的發(fā)泡機理、破滅機理和發(fā)泡效果的評價指標體系進行了分析。通過室內(nèi)瀝青發(fā)泡特性試驗,研究瀝青的發(fā)泡效果與其影響因素之間的相關性。瀝青的發(fā)泡效果采用膨脹比和半衰期兩個指標綜合評價。結(jié)果表明:瀝青種類、瀝青溫度、發(fā)泡用水量對瀝青的發(fā)泡效果均產(chǎn)生顯著影響�；谂菽瓰r青冷再生混合料的強度形成機理,提出其混合料的配合比設計流程�？紤]到不同地區(qū)經(jīng)濟水平、技術力量及施工限制,針對粉料目標通過率無法達到設計標準的實際工程現(xiàn)狀,設計了一組粉料較少的級配。通過土工重型擊實試驗,確定了不同級配混合料的最佳拌和用水量;以間接抗拉強度為控制指標,確定了最佳泡沫瀝青用量;詳細評價了再生混合料的物理特性和路用性能,主要包括混合料的密度、空隙率、水穩(wěn)定性、高溫穩(wěn)定性、無側(cè)限抗壓強度、疲勞特性。結(jié)果表明:粉料對混合料性能有顯著的影響,但是3%的0.075mm以下粉料通過率的混合料性能也較好,滿足再生技術規(guī)范要求,可用于指導實際的工程應用。其次,通過試驗探討了瀝青種類及用量、拌和用水量、養(yǎng)生條件、水泥摻量等關鍵因素對泡沫瀝青冷再生混合料性能的影響程度。發(fā)泡效果理想的瀝青在混合料中的分散性良好,能形成強粘結(jié)力的瀝青膠漿。合理的拌和用水量不僅充當著潤滑劑,而且能改善泡沫瀝青在混合料中的分散性。按規(guī)范標準,養(yǎng)生3d后的試件中含水量極少,水泥已完全水化,形成足夠強度。水泥能改善泡沫瀝青在混合料中的分散效果,且水泥作為“剛性”的次級結(jié)合料,能提高混合料的強度。最后,本文根據(jù)路面結(jié)構(gòu)的損壞與結(jié)構(gòu)內(nèi)部應力應變力學特性有著密切聯(lián)系,建立有限元模型。基于路面結(jié)構(gòu)基層的模量和厚度變化,分析泡沫瀝青冷再生基層路面結(jié)構(gòu)的受力影響,并擬定不同的路面結(jié)構(gòu)組合進行力學特性對比,對指導泡沫瀝青半柔性冷再生基層路面合理結(jié)構(gòu)的設計有著重要意義。
[Abstract]:Based on the sustainable development strategy of saving energy, protecting ecological environment and recycling used asphalt pavement waste materials, the cold recycling technology of foamed asphalt is used as a new "green" road maintenance and maintenance method. In recent years, more and more attention has been paid by the maintenance departments of highway construction at home and abroad. The cold recycling technology of foamed asphalt is mainly used in the basic course of pavement structure or the base course of the pavement, whether it is energy saving or environmental protection. Reducing the cost of road maintenance is still of great value to the pavement performance. This paper relies on the G318 line of Chongqing Wanzhou District Luodang to water section of pavement reconstruction project. From the point of view of mixture performance and reasonable pavement structure design, the cold recycling technology of foamed asphalt is analyzed in order to form a perfect theoretical system and provide guidance for the application of practical engineering projects. In this paper, the foaming mechanism, the burst mechanism and the evaluation index system of foaming effect of foamed asphalt are analyzed, and the foaming characteristics of indoor asphalt are tested. This paper studies the correlation between the foaming effect of asphalt and its influencing factors. The foaming effect of asphalt is evaluated by expansion ratio and half-life. The results show that the kind of asphalt, the temperature of asphalt. Based on the strength formation mechanism of cold recycled asphalt mixture, the mixture ratio design process is put forward, taking into account the economic level of different regions. In view of the actual engineering situation that the passing rate of powder target can not reach the design standard, a group of powder gradation with less gradation is designed, and the heavy compaction test is carried out through geotechnical heavy compaction test. The optimum mixing water consumption of different gradation mixture is determined. Taking the indirect tensile strength as the control index, the optimum amount of foamed asphalt was determined. The physical properties and road performance of recycled mixture are evaluated in detail, including density, void ratio, water stability, high temperature stability and unconfined compressive strength. Fatigue characteristics. The results show that: powder has a significant impact on the performance of the mixture, but the mixture of less than 0.075mm of 3% has better performance, which meets the requirements of the technical specifications for recycling. It can be used to guide practical engineering application. Secondly, the types and dosage of asphalt, mixing water consumption and health condition are discussed through experiments. The degree of influence of cement content on the performance of foamed asphalt cold recycled mixture. The asphalt with ideal foaming effect has good dispersity in the mixture. Reasonable mixing water not only acts as lubricant but also can improve the dispersion of foamed asphalt in mixture. According to the standard, the moisture content of the sample after 3 days of health preservation is very little. Cement has been completely hydrated to form sufficient strength. Cement can improve the dispersion effect of foamed asphalt in the mixture, and as a "rigid" secondary binder, cement can improve the strength of the mixture. Finally. In this paper, according to the damage of pavement structure and the stress and strain characteristics of the structure, a finite element model is established based on the change of the modulus and thickness of the base course of the pavement structure. This paper analyzes the mechanical effect of froth asphalt cold recycled base pavement structure, and draws up different pavement structure combinations to compare the mechanical characteristics. It is of great significance to guide the design of reasonable pavement structure of semi-flexible cold regenerated base course of foamed asphalt.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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