乳化瀝青冷再生混合料設(shè)計(jì)方法優(yōu)化研究
發(fā)布時(shí)間:2019-01-03 17:58
【摘要】:瀝青路面冷再生技術(shù)具有以下優(yōu)點(diǎn):一是可以矯正路面病害,提高服務(wù)質(zhì)量;二是可以實(shí)現(xiàn)廢舊路面材料的利用,減少資源的浪費(fèi),保護(hù)生態(tài)環(huán)境;三是降低工程造價(jià)。在資源日益緊張、環(huán)保意識(shí)不斷增強(qiáng)、國家大力提倡可持續(xù)發(fā)展的形勢下,發(fā)展瀝青路面再生技術(shù),對(duì)于實(shí)現(xiàn)我國公路的可持續(xù)發(fā)展以及綠色交通的建設(shè),具有十分重要的意義。 由于冷再生瀝青混合料是在常溫下拌和、攤鋪、碾壓的,養(yǎng)生完成后具有較大的空隙率和相對(duì)較低的力學(xué)性能,在路用性能方面難以達(dá)到熱拌瀝青混合料的標(biāo)準(zhǔn),因此,它往往并不是直接作為面層使用,而是在其上面加鋪一定厚度的熱拌瀝青混合料(HMA)。在HMA的施工過程中,由于HMA的溫度可達(dá)150-190℃,冷再生層瀝青混合料會(huì)被HMA加熱,在壓實(shí)機(jī)械的作用,冷再生層會(huì)被進(jìn)一步壓密,而現(xiàn)有的冷再生混合料設(shè)計(jì)方法并未考慮這一壓實(shí)過程,僅將冷再生層養(yǎng)生完成后的狀態(tài)作為混合料的最終狀態(tài),進(jìn)而造成冷再生混合料室內(nèi)配合比設(shè)計(jì)與工程實(shí)際之間存在一定偏差,這種偏差造成室內(nèi)設(shè)計(jì)無法為工程質(zhì)量控制提供依據(jù),并且不能給瀝青路面結(jié)構(gòu)設(shè)計(jì)提供準(zhǔn)確參數(shù)。鑒于此,本論文在現(xiàn)有冷再生混合料設(shè)計(jì)方法的基礎(chǔ)上,以膠州灣高速公路大修為依托,開展乳化瀝青冷再生混合料設(shè)計(jì)方法的優(yōu)化研究。 本文首先介紹了水泥-乳化瀝青冷再生混合料的強(qiáng)度形成機(jī)理以及國內(nèi)外冷再生混合料的設(shè)計(jì)方法,并且按照我國再生技術(shù)規(guī)范的配合比設(shè)計(jì)試鋪筑了試驗(yàn)路,發(fā)現(xiàn)了HMA施工后較tHMA未施工前冷再生層路面芯樣的平均空隙率減小了10.4%;HMA施工后再生層上半部分(0-8cm)較下半部分(8-16cm)的空隙率減小了21%。 研究空隙率的變化必須清楚HMA施工過程中冷再生層溫度場的變化,本文應(yīng)用溫度采集裝置實(shí)測再生層的溫度分布,監(jiān)測到在2cm深度處,溫度可達(dá)到88-℃;同時(shí)還利用Fluent有限元軟件從理論上分析了再生層的溫度場,對(duì)兩者進(jìn)行了對(duì)比,三個(gè)監(jiān)測點(diǎn)中最大誤差為3.4%,這說明了采用Fluent軟件可以較好的模擬再生層中溫度場變化。 利用Fluent研究了再生層作為基層和下面層、在鋪筑不同溫度、厚度的HMA時(shí),溫度場的變化規(guī)律,并給出了在有效時(shí)間內(nèi)相應(yīng)的最高溫度隨深度變化的函數(shù)關(guān)系式。 研究了延時(shí)成型和養(yǎng)生方式對(duì)再生混合料的影響,同時(shí)對(duì)比了不同種測定毛體積密度的方法,密度從小到大依次是corelok法、蠟封法、表干法、體積法。其中與蠟封法所測密度最相近的是Corelok法。 最后,基于室內(nèi)馬歇爾試件與HMA施工前后路面芯樣空隙率一致的原則,提出了優(yōu)化的乳化瀝青冷再生混合料設(shè)計(jì)方法。
[Abstract]:The cold recycling technology of asphalt pavement has the following advantages: first, it can correct pavement diseases and improve service quality; second, it can realize the utilization of waste pavement materials, reduce the waste of resources and protect the ecological environment; third, reduce the project cost. Under the situation of increasing shortage of resources, increasing awareness of environmental protection and promoting sustainable development of the country, the development of asphalt pavement regeneration technology will contribute to the sustainable development of highway and the construction of green transportation in China. It is of great significance. Because the cold recycled asphalt mixture is mixed, spread and compacted at room temperature, and has large void ratio and relatively low mechanical properties after health maintenance, it is difficult to reach the standard of hot mix asphalt mixture in road performance. It is often not directly used as a surface, but on top of which a certain thickness of hot mix asphalt mixture (HMA). Is added During the construction of HMA, because the temperature of HMA can reach 150 鈩,
本文編號(hào):2399706
[Abstract]:The cold recycling technology of asphalt pavement has the following advantages: first, it can correct pavement diseases and improve service quality; second, it can realize the utilization of waste pavement materials, reduce the waste of resources and protect the ecological environment; third, reduce the project cost. Under the situation of increasing shortage of resources, increasing awareness of environmental protection and promoting sustainable development of the country, the development of asphalt pavement regeneration technology will contribute to the sustainable development of highway and the construction of green transportation in China. It is of great significance. Because the cold recycled asphalt mixture is mixed, spread and compacted at room temperature, and has large void ratio and relatively low mechanical properties after health maintenance, it is difficult to reach the standard of hot mix asphalt mixture in road performance. It is often not directly used as a surface, but on top of which a certain thickness of hot mix asphalt mixture (HMA). Is added During the construction of HMA, because the temperature of HMA can reach 150 鈩,
本文編號(hào):2399706
本文鏈接:http://sikaile.net/kejilunwen/jiaotonggongchenglunwen/2399706.html
最近更新
教材專著