【摘要】：近幾年來,隨著預(yù)防性養(yǎng)護(hù)技術(shù)的逐步推廣,舊瀝青路面加鋪薄層罩面技術(shù)也得到了廣泛的應(yīng)用。舊瀝青路面加鋪薄層罩面作為一種事先、主動(dòng)的預(yù)防性養(yǎng)護(hù)技術(shù),如何確定其最佳的養(yǎng)護(hù)時(shí)機(jī)顯得尤為重要；同時(shí),在該技術(shù)的實(shí)際應(yīng)用過程中,常因薄層罩面與舊瀝青路面層間性能不穩(wěn)定而導(dǎo)致病害的產(chǎn)生,層間性能的穩(wěn)定與否是薄層罩面發(fā)揮其預(yù)防性養(yǎng)護(hù)功能的關(guān)鍵因素。因此,對薄層罩面最佳養(yǎng)護(hù)時(shí)機(jī)及其層間性能方面的研究具有重要的理論意義和實(shí)用價(jià)值。首先,在對國內(nèi)外常用預(yù)防性養(yǎng)護(hù)最佳養(yǎng)護(hù)時(shí)機(jī)確定方法進(jìn)行分析的基礎(chǔ)上,應(yīng)用生命周期費(fèi)用分析,通過效果(效益)-費(fèi)用比確定出薄層罩面最佳養(yǎng)護(hù)時(shí)機(jī)。然后,通過對薄層罩面結(jié)構(gòu)粘結(jié)層材料的性能及層間粘結(jié)強(qiáng)度理論的研究,應(yīng)用BISAR3.0軟件對薄層罩面結(jié)構(gòu)在行車荷載作用下的層間力學(xué)響應(yīng)進(jìn)行分析,得到層間的最大剪應(yīng)力出現(xiàn)在單輪中心下的前部區(qū)域,而最大拉應(yīng)力出現(xiàn)在單輪中心下的后部區(qū)域。水平力系數(shù)、罩面厚度、面層厚度、溫度等對結(jié)構(gòu)層間的最大剪應(yīng)力和最大拉應(yīng)力有較大的影響,同時(shí)提出了薄層罩面結(jié)構(gòu)層間粘結(jié)技術(shù)指標(biāo)。最后,通過兩種罩面層材料和三種粘結(jié)材料的室內(nèi)直剪試驗(yàn),確定薄層罩面結(jié)構(gòu)層間抗剪強(qiáng)度隨著粘結(jié)層材料用量的變化規(guī)律,并得到兩種薄層罩面材料對應(yīng)不同粘結(jié)層材料的最佳用量。同時(shí),得到薄層罩面結(jié)構(gòu)粘結(jié)層材料中SBS改性瀝青粘結(jié)性能最優(yōu),70-A瀝青次之,改性乳化瀝青粘結(jié)性能略差,但抗剪強(qiáng)度均滿足所提出的抗剪強(qiáng)度指標(biāo)要求。通過考慮不同溫度和浸水條件對粘結(jié)層性能影響的試驗(yàn)得到,兩者均對粘結(jié)層抗剪強(qiáng)度有較為不利的影響,SBS改性瀝青受影響較大,70-A瀝青次之,改性乳化瀝青相對較弱。通過在粘結(jié)層最佳瀝青用量條件下的室內(nèi)拉拔試驗(yàn)得出層間抗拉強(qiáng)度變化規(guī)律,且所得抗拉強(qiáng)度均滿足所提出的抗拉強(qiáng)度指標(biāo)要求。
[Abstract]:In recent years, with the gradual popularization of preventive maintenance technology, the thin layer overlay technology of old asphalt pavement has also been widely used. As a kind of preventive maintenance technology, how to determine the best maintenance time is particularly important for the old asphalt pavement to be covered with thin layer as a kind of preventive maintenance technology in advance and initiative. At the same time, in the practical application of this technology, the instability of interlaminar performance between thin layer overlay and old asphalt pavement often leads to diseases, and the stability of interlaminar performance is the key factor for thin layer overlay to give full play to its preventive maintenance function. Therefore, it is of great theoretical significance and practical value to study the optimum curing time and interlaminar properties of thin layer overlay. First of all, based on the analysis of the method of determining the best maintenance time of preventive maintenance at home and abroad, the life cycle cost analysis is applied to determine the optimal maintenance time of the thin layer cover through the effect (benefit)-cost ratio. Then, through the study of the properties of the bonding layer material and the theory of the interlaminar bond strength, the BISAR3.0 software is used to analyze the interlaminar mechanical response of the thin-layer overlay structure under the driving load, and the interlaminar mechanical response of the laminated overlay structure under the driving load is analyzed. It is obtained that the maximum shear stress between layers appears in the front region under the center of the single wheel, while the maximum tensile stress appears in the rear region under the center of the single wheel. The horizontal force coefficient, cover thickness, surface thickness and temperature have great influence on the maximum shear stress and the maximum tensile stress between the structural layers. At the same time, the technical index of interlaminar bonding of the thin-layer overlay structure is put forward. Finally, through the laboratory direct shear test of two kinds of overlay materials and three kinds of bonding materials, the variation of interlaminar shear strength of thin layer overlay structure with the amount of adhesive layer materials is determined. The optimum dosage of two kinds of thin layer covering materials corresponding to different bonding layer materials was obtained. At the same time, the adhesive performance of SBS modified asphalt is the best, 70 A asphalt is the second, and the modified emulsified asphalt is slightly worse, but the shear strength meets the requirements of the proposed shear strength index. By considering the effects of different temperature and immersion conditions on the properties of the adhesive layer, it is found that both of them have adverse effects on the shear strength of the adhesive layer. SBS modified asphalt is more affected, 70 / A asphalt is the second, and modified emulsified asphalt is relatively weak. The variation rule of inter-layer tensile strength is obtained by indoor pull-out test under optimum asphalt content of bond layer, and the obtained tensile strength meets the requirements of the proposed tensile strength index.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.217;U418.6

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本文編號：2474859