本文選題：瀝青路面 + 非均勻性　； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：一直以來(lái)，瀝青路面早期病害現(xiàn)象比較多，且難以得到有效解決。在高速公路通車三年內(nèi)，瀝青路面不同程度發(fā)生坑槽、泛油、車轍等病害。現(xiàn)場(chǎng)調(diào)查結(jié)果表明，這些病害類型都是局部性的，由此可知這是由于瀝青路面的非均勻性所引起的。 瀝青路面的非均勻性是指瀝青混合料在原材料選擇、材料組成設(shè)計(jì)、混合料生產(chǎn)與施工等環(huán)節(jié)中，局部出現(xiàn)了實(shí)際指標(biāo)與設(shè)計(jì)或規(guī)范要求的指標(biāo)存在超標(biāo)準(zhǔn)的偏差現(xiàn)象，導(dǎo)致瀝青混合料是施工后局部路段所具有的路面性能與設(shè)計(jì)的期望出現(xiàn)不可接受的差別，從而影響了瀝青路面的服務(wù)能力和使用壽命。引起非均勻性現(xiàn)象有來(lái)自材料的離散、級(jí)配控制的差異、設(shè)備本身存在的穩(wěn)定及施工組織中質(zhì)量控制的差異等。 通過(guò)分析瀝青路面早期病害類型及成因，指出其質(zhì)量非均勻性的主要影響因素是級(jí)配離析、溫度離析及弱壓實(shí)等。探討各種非均勻性檢測(cè)技術(shù)，包括傳統(tǒng)和新興技術(shù)。推薦采用無(wú)核密度儀（PQI）結(jié)合激光紋理儀在表面和深度方向上定量檢測(cè)瀝青路面的非均勻性，可以同時(shí)檢測(cè)路面橫向的、縱向的、豎向的和局部的非均勻性。 為定量分析離析程度對(duì)路面性能的相關(guān)性，通過(guò)對(duì)不同離析程度的混合料分析其力學(xué)指標(biāo)和性能指標(biāo)（高溫穩(wěn)定性、低溫溫度性、水穩(wěn)定性）。采用漢堡車轍儀分別分析了離析程度與混合料高溫穩(wěn)定性和水敏感性得出，粗集料離析混合的高溫穩(wěn)定性強(qiáng)于細(xì)集料離析混合料的；而同樣是粗集料離析的混合料，其高溫抗車轍能力隨著離析程度的增加而降低。同時(shí)如只是靠單個(gè)指標(biāo)難以完全評(píng)價(jià)高溫溫度性，應(yīng)綜合各項(xiàng)指標(biāo)共同分析來(lái)評(píng)價(jià)；細(xì)集料離析的混合料水穩(wěn)性好于各種粗集料離析混合料的。 對(duì)混合料施工現(xiàn)場(chǎng)中的溫度離析、弱壓實(shí)以及級(jí)配離析進(jìn)行了全過(guò)程定量分析，并采用灰關(guān)聯(lián)度分析法分析不同因素影響權(quán)重，其結(jié)果表明影響瀝青路面非均勻按程度依次為路面壓實(shí)、混合料級(jí)配及混合料溫度。其中，路面壓實(shí)尤其要控制壓實(shí)指數(shù)；混合料級(jí)配首要應(yīng)控制瀝青用量，其次用平均離析率來(lái)分析集料差異具有良好的效果；混合料溫度離析主要發(fā)生在碾壓階段，特別要控制初壓階段的混合料溫度。 根據(jù)施工階段集料平均離析率、壓實(shí)指數(shù)、初壓和復(fù)壓溫度的測(cè)定與分析，提出了路面預(yù)測(cè)密度或空隙率的預(yù)測(cè)模型，可對(duì)路面施工質(zhì)量非均勻性開展快速、簡(jiǎn)單評(píng)定。
[Abstract]:All along, the asphalt pavement early disease phenomenon is more, and is difficult to get the effective solution. In the three years of expressway opening, asphalt pavement has various degree of pothole, oil, rutting and other diseases. The results of field investigation show that these disease types are local, which is caused by the non-uniformity of asphalt pavement. The non-uniformity of asphalt pavement refers to the selection of raw materials and the design of material composition of asphalt pavement. In the process of mixture production and construction, there is a phenomenon of exceeding the standard deviation between the actual index and the index required by the design or specification. It leads to unacceptable difference between the pavement performance and the design expectation of the local section of the asphalt mixture after construction, which affects the service ability and service life of the asphalt pavement. The causes of non-uniformity include the dispersion of materials, the difference of gradation control, the stability of equipment itself and the difference of quality control in construction organization, etc. By analyzing the types and causes of early diseases of asphalt pavement, It is pointed out that the main influencing factors of mass inhomogeneity are gradation segregation, temperature segregation and weak compaction. Various non-uniformity detection techniques, including traditional and emerging technologies, are discussed. It is recommended that the nonuniformity of asphalt pavement can be detected quantitatively in the direction of surface and depth by using the seedless densitometer (PQI) combined with the laser texture analyzer, and the horizontal and longitudinal pavement can be detected simultaneously. In order to quantitatively analyze the correlation between segregation degree and pavement performance, the mechanical and performance indexes (high temperature stability, low temperature, water stability) of mixture with different segregation degree are analyzed. Based on the analysis of segregation degree and high temperature stability and water sensitivity of mixture by Hamburg rutting instrument, it is concluded that the high temperature stability of coarse aggregate segregation mixture is stronger than that of fine aggregate segregation mixture, and the mixture is also coarse aggregate segregation mixture. Its high temperature rutting resistance decreases with the increase of segregation degree. At the same time, if it is difficult to evaluate the temperature of high temperature completely by a single index, it should be evaluated by the common analysis of each index. The water stability of fine aggregate segregation mixture is better than that of coarse aggregate segregation mixture. The whole process quantitative analysis of temperature segregation, weak compaction and gradation segregation in the construction site of the mixture is carried out. The influence weight of different factors is analyzed by grey correlation degree analysis. The results show that the non-uniform degree of influence on asphalt pavement is pavement compaction, mixture gradation and mixture temperature. Among them, the compaction index should be controlled especially for pavement compaction, asphalt dosage should be first controlled in mixture gradation, and the average segregation rate should be used to analyze the difference of aggregate. The temperature segregation of mixture mainly occurs in the rolling stage. According to the measurement and analysis of the average segregation rate, compaction index, initial pressure and repressing temperature of aggregate in the construction stage, the prediction model of pavement prediction density or void ratio is put forward. The nonuniformity of pavement construction quality can be evaluated quickly and simply.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.217

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