本文選題：乳化瀝青 + 柔性纖維�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：半剛性基層瀝青路面容易出現(xiàn)反射裂縫病害,為提高半剛性基層的抗裂性能,論文基于乳化瀝青增柔作用和纖維阻裂增韌作用,采用乳化瀝青和聚丙烯纖維兩種材料對水泥穩(wěn)定碎石進行改性研究。論文采用理論分析和試驗研究相結(jié)合的方法,首先完成乳化瀝青和柔性纖維的選型工作,確定采用慢裂快凝型陽離子乳化瀝青和19mm聚丙烯纖維。通過改變?nèi)榛癁r青和纖維摻量,確定CTM、CBTM-2、CBTM-3、CBTM-4和PPCBTM五種配合比。在對試驗配合比進行一系列實驗研究的基礎(chǔ)上,得出以下結(jié)論:①乳化瀝青的摻入會降低水泥穩(wěn)定碎石的抗壓強度、劈裂強度和彎拉強度,強度下降幅度與乳化瀝青摻量呈正相關(guān)關(guān)系。②通過對抗壓強度和劈裂強度比值的分析,得出無論水泥穩(wěn)定碎石中是否加入聚丙烯纖維或乳化瀝青,90d齡期時混合料的抗壓強度與劈裂強度比值都穩(wěn)定在8.4~9.1之間。③柔性纖維-乳化瀝青水泥穩(wěn)定碎石受壓破壞后“破而不碎”的性質(zhì),使混合料在帶縫條件下仍具有較好的延性和承載能力。④乳化瀝青能夠增加水泥穩(wěn)定碎石的柔性,降低水泥穩(wěn)定碎石的抗壓回彈模量和彎拉回彈模量,抗壓回彈模量降低幅度與乳化瀝青摻量呈正相關(guān)關(guān)系。聚丙烯纖維的摻入能夠進一步降低乳化瀝青水泥穩(wěn)定碎石的抗壓回彈模量。⑤乳化瀝青能夠增加水泥穩(wěn)定碎石的極限應(yīng)變,3%的乳化瀝青摻入能夠使水泥穩(wěn)定碎石的極限應(yīng)變提高67.5%,有效的緩解了基層中因應(yīng)變過大導(dǎo)致的開裂。⑥聚丙烯纖維能夠有效提高乳化瀝青水泥穩(wěn)定碎石的彎曲韌性,且添加聚丙烯纖維后,混合料的彎曲韌性指數(shù)也明顯高于普通水泥穩(wěn)定碎石,韌性的提高使基層裂縫擴展需要吸收更多的能量,能夠減慢基層裂縫的擴展速度。⑦聚丙烯纖維能夠提高乳化瀝青水泥穩(wěn)定碎石的臨界裂縫嘴張口位移、斷裂韌度及斷裂能,改善了乳化瀝青水泥穩(wěn)定碎石的斷裂性能。⑧聚丙烯纖維能夠減小乳化瀝青水泥穩(wěn)定碎石的溫縮系數(shù)。論文采用兩種不同性質(zhì)材料復(fù)摻的方法對水泥穩(wěn)定碎石進行改性研究,有效的改善了水泥穩(wěn)定碎石變形、韌性和收縮等抗裂方面的性能,為半剛性基層材料防裂研究提供了一種新的研究思路。
[Abstract]:In order to improve the anti-cracking performance of semi-rigid asphalt pavement, this paper is based on the flexible effect of emulsified asphalt and the anti-cracking and toughening effect of fiber. The modification of cement stabilized macadam with emulsified asphalt and polypropylene fiber was studied. In this paper, the selection of emulsified asphalt and flexible fiber is completed by combining theoretical analysis and experimental study, and the slow-cracking fast-setting cationic emulsified asphalt and 19mm polypropylene fiber are selected. By changing the content of emulsified asphalt and fiber, five kinds of blending ratio of CBTM-2 / CBTM-3 and CBTM-4 and PPCBTM were determined. On the basis of a series of experimental studies on the mixture ratio of cement cement, the following conclusions are drawn: the addition of emulsified asphalt at 1: 1 can reduce the compressive strength, splitting strength and flexural strength of cement stabilized macadam. There is a positive correlation between the decrease of strength and the content of emulsified asphalt by analyzing the ratio of compressive strength and splitting strength. It is concluded that the ratio of compressive strength to splitting strength of the mixture is stable between 8.49.1 and 8.49.1, regardless of whether polypropylene fiber or emulsified asphalt is added into cement stabilized macadam for 90 days. 3. 3 flexible fiber-emulsified asphalt cement stabilized macadam under compression. The nature of "breaking but not breaking" after destruction, The mixture still has good ductility and bearing capacity under the condition of joint. 4 emulsified asphalt can increase the flexibility of cement stabilized macadam and reduce the modulus of compressive resilience and flexural elasticity of cement stabilized macadam. The decrease of modulus of compressive resilience is positively correlated with the content of emulsified asphalt. Polypropylene fiber incorporation can further reduce the compressive resilience modulus of emulsified asphalt cement stabilized macadam .5 emulsified asphalt can increase the limit strain of cement stabilized macadam by 3% emulsified asphalt can make cement stabilized macadam The ultimate strain is increased by 67.5%, which effectively alleviates the cracking of 6. 6 polypropylene fiber in the base course caused by excessive strain. It can effectively improve the flexural toughness of emulsified asphalt cement stabilized macadam. After adding polypropylene fiber, the flexural toughness index of the mixture is obviously higher than that of the ordinary cement stabilized macadam. With the increase of toughness, the crack propagation of the base course needs to absorb more energy. 7. Polypropylene fiber can improve the critical crack mouth opening displacement, fracture toughness and fracture energy of emulsified asphalt cement stabilized macadam. The fracture performance of emulsified asphalt cement stabilized macadam is improved. 8. Polypropylene fiber can reduce the temperature shrinkage coefficient of emulsified asphalt cement stabilized macadam. In this paper, two kinds of different materials are used to modify the cement stabilized macadam, which can effectively improve the crack resistance, such as deformation, toughness and shrinkage of cement stabilized macadam. It provides a new research idea for anti-crack research of semi-rigid base material.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

【參考文獻】

相關(guān)期刊論文 前3條

1 殷川;曹磊;趙躍;;水泥乳化瀝青穩(wěn)定基層應(yīng)用研究[J];國防交通工程與技術(shù);2007年01期

2 曹陽;姚勇;陳健;陳欣;陳飛;徐宏;王捷;;水泥穩(wěn)定碎石基層優(yōu)化設(shè)計[J];公路;2009年04期

3 楊錫武;劉惠;;摻乳化瀝青半剛性基層混合料的強度與收縮性研究[J];山東交通學(xué)院學(xué)報;2009年01期

相關(guān)碩士學(xué)位論文 前1條

1 郭義超;水泥穩(wěn)定碎石材料的乳化瀝青增柔改性[D];湖南大學(xué);2012年

，

本文編號：1845475