【摘要】：瀝青路面冷再生技術(shù)可以有效提高資源利用率，保護生態(tài)環(huán)境，具有顯著的經(jīng)濟、社會和環(huán)境效益。如今，在瀝青路面維修工程中，冷再生技術(shù)得以廣泛應(yīng)用。利用冷再生技術(shù)對道路進行施工時，，冷再生混合料在壓實過程中會發(fā)生破碎，導(dǎo)致其級配發(fā)生變化，目前對這一問題的研究還較少。本文的研究目的在于通過室內(nèi)擊實試驗探討冷再生混合料在擊實前后的級配變化情況，并采用離散元方法分析導(dǎo)致冷再生混合料在壓實過程中級配發(fā)生變化的顆粒破碎現(xiàn)象。 首先，本文對冷再生混合料在室內(nèi)擊實過程中的級配變化進行了研究，發(fā)現(xiàn)冷再生混合料顆粒在擊實過程中發(fā)生了破碎，導(dǎo)致冷再生混合料的級配發(fā)生變化，并且顆粒的破碎主要集中在9.5mm～26.5mm的粒徑范圍；其次，在舊路調(diào)查的基礎(chǔ)上對舊灰土的劈裂強度進行了測試，并利用PFC2D軟件對舊灰土的劈裂強度試驗進行了模擬，提出用舊灰土顆粒間的平行粘結(jié)強度來對冷再生混合料的顆粒團強度進行評價；然后，采用PFC2D軟件建立了冷再生混合料結(jié)構(gòu)層離散元模型，并對其壓實過程進行了模擬，發(fā)現(xiàn)隨著碾壓遍數(shù)的增多，冷再生混合料中發(fā)生破碎的顆粒數(shù)目會增多，從而導(dǎo)致冷再生混合料的級配發(fā)生變化。 最后，提出了冷再生混合料用于二級及以下公路基層時的目標(biāo)級配范圍和一種對目標(biāo)級配進行修正的措施或方法。并對以水泥石灰為穩(wěn)定劑的冷再生混合料的抗壓強度、劈裂強度、抗壓回彈模量和彎拉強度等路用性能進行了研究，結(jié)果發(fā)現(xiàn)齡期和水泥含量一定時，水泥石灰冷再生混合料的抗壓強度、劈裂強度和彎拉強度隨石灰含量的增加而減小；水泥和石灰含量一定時，水泥石灰冷再生混合料的抗壓強度、劈裂強度和抗壓回彈模量隨齡期的增長而增大。 本文的研究豐富了低等級道路的就地冷再生技術(shù)，為冷再生技術(shù)施工提供了一定的參考價值，具有一定的理論和實際意義。
[Abstract]:The cold recycling technology of asphalt pavement can effectively improve the utilization rate of resources and protect the ecological environment. It has remarkable economic, social and environmental benefits. Nowadays, cold recycling technology is widely used in asphalt pavement maintenance engineering. When the cold recycling technology is used in the construction of the road, the cold recycled mixture will be broken in the compaction process, resulting in the change of its grading. At present, there are few researches on this problem. The purpose of this paper is to discuss the gradation change of cold recycled mixture before and after compaction through indoor compaction test, and to analyze the phenomenon of particle breakage which leads to the change of intermediate distribution of cold recycled mixture during compaction by using discrete element method. Firstly, this paper studies the gradation change of cold recycled mixture in the process of indoor compaction. It is found that the grain of cold recycled mixture is broken in the process of compaction, which leads to the change of the gradation of cold recycled mixture. Secondly, the splitting strength of the old lime soil was tested on the basis of the old road investigation, and the splitting strength test of the old lime soil was simulated by PFC2D software. It is proposed that the particle strength of cold recycled mixture be evaluated by parallel bond strength between old lime and soil particles, and then the discrete element model of structure layer of cold recycled mixture is established by using PFC2D software, and the compaction process of cold recycled mixture is simulated. It is found that the number of broken particles in the cold recycled mixture will increase with the increase of the number of rolling times, which leads to the change of the gradation of the cold recycled mixture. Finally, the target gradation range of cold recycled mixture and a method to modify the target gradation are put forward. The compressive strength, splitting strength, compressive resilience modulus and flexural tensile strength of cold recycled mixture with cement lime as stabilizer are studied. The results show that the age and cement content are constant. The compressive strength, splitting strength and flexural strength of cement lime cold recycled mixture decrease with the increase of lime content, while the compressive strength of cement lime cold recycled mixture decreases with the increase of lime content. The splitting strength and modulus of compressive resilience increase with the increase of age. The research in this paper enriches the local cold regeneration technology of low grade roads, and provides a certain reference value for the construction of cold regeneration technology, which has certain theoretical and practical significance.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.26;U414

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