【摘要】：SMA瀝青混合料作為一種性能優(yōu)良的路面材料,以其具有抗高溫、低溫穩(wěn)定性,良好的水穩(wěn)定性,良好的耐久性和表面功能,被廣泛應(yīng)用。但是SMA混合料也存在拌合成型溫度高,生產(chǎn)施工耗能大,廢棄粉塵排放多等問題,同時普通SMA混合料中一般加入纖維穩(wěn)定劑,由于纖維的加入導(dǎo)致成本增加、拌合不充分、增加生產(chǎn)施工難度等問題。為解決以上問題,本文對一種新型的溫拌無纖維SMA瀝青混合料進(jìn)行室內(nèi)試驗研究。文章首先對原材料的各項技術(shù)指標(biāo)進(jìn)行測試分析,選取符合規(guī)范要求的原材料,并確定本研究室內(nèi)試驗所需的試驗方法與步驟。先進(jìn)行了普通熱拌SMA混合料配合比設(shè)計,在此基礎(chǔ)上,進(jìn)行溫拌無纖維SMA混合料配合比設(shè)計,并利用謝倫堡析漏試驗檢驗瀝青用量,最終確定出溫拌無纖維SMA混合料級配組成和拌合溫度。其次,利用旋轉(zhuǎn)壓實儀通過室內(nèi)壓實試件,繪制密實曲線,通過旋轉(zhuǎn)壓實能量指數(shù)CEI、Nini和Ndes在半對數(shù)坐標(biāo)上的密實度斜率k和密實能量指數(shù)TDI來評價溫拌無纖維SMA瀝青混合料的的旋轉(zhuǎn)壓實特性,并與普通熱拌SMA混合料(熱拌,有纖維,不加溫拌劑)和熱拌低溫SMA混合料(成型溫度140℃,有纖維,不加溫拌劑)進(jìn)行對比研究。同時分析不同溫度、不同油石比條件下的旋轉(zhuǎn)壓實特性變化規(guī)律。然后,對溫拌無纖維SMA混合料基本路用性能進(jìn)行詳細(xì)的測試,包括高溫穩(wěn)定性、低溫抗裂性、水穩(wěn)定性等,并與普通熱拌SMA混合料的路用性能進(jìn)行對比研究,結(jié)果表明:雖然路用性能略遜色,但是完全符合相應(yīng)的規(guī)范要求,滿足路面使用要求。最后,分別對溫拌無纖維SMA混合料和普通熱拌SMA混合料的經(jīng)濟(jì)效益和社會效益對比研究分析,結(jié)果表明:在經(jīng)濟(jì)和社會效益上,溫拌無纖維SMA混合料存在很大的優(yōu)勢。
[Abstract]:As a kind of pavement material with excellent performance, SMA asphalt mixture is widely used for its high temperature resistance, low temperature stability, good water stability, good durability and surface function. However, SMA mixture also has some problems, such as high mixing temperature, large energy consumption in production and construction, waste dust emission and so on. At the same time, fiber stabilizer is generally added to the ordinary SMA mixture, because of the increase of cost caused by the addition of fiber, the mixing is not sufficient. Increase the difficulty of production construction and other issues. In order to solve the above problems, a new type of warm-mixed fiber-free SMA asphalt mixture is studied in laboratory. In this paper, the technical indexes of raw materials are tested and analyzed, the raw materials that meet the specifications are selected, and the test methods and steps for the laboratory test are determined. In this paper, the mixture ratio design of ordinary hot-mixed SMA mixture is carried out first, and on this basis, the mixture ratio design of warm mixed non-fiber SMA mixture is carried out, and the asphalt content is tested by Schelenburg leakage analysis test. Finally, the grading composition and mixing temperature of warm mixing fiber free SMA mixture were determined. Secondly, the compaction curve is drawn through the indoor compaction specimen by using the rotary compaction instrument. The compactness slope k and compaction energy index TDI of the rotational compaction energy index CEI,Nini and Ndes in semi-logarithmic coordinates are used to evaluate the rotational compaction characteristics of warm mixed fibrous SMA asphalt mixture, and to evaluate the rotational compaction characteristics of warm mixed fibrous SMA asphalt mixture. A comparative study was carried out between hot mix and low temperature SMA mixture (molding temperature 140 鈩，

本文編號：2215882