本文選題：聚酯纖維　切入點(diǎn)：水泥穩(wěn)定砂礫　出處：《新疆大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：半剛性基層一直是我國(guó)高速公路及城市道路建設(shè)中最常用的基層類型，，其中水泥穩(wěn)定類基層又因其強(qiáng)度高、板體性好等特點(diǎn)而被廣泛使用。作為西部最常用半剛性基層，由于水泥穩(wěn)定砂礫固有干縮濕漲、低溫收縮以及抗彎曲變形能力差等性質(zhì)，不可避免的會(huì)產(chǎn)生開裂變形。微裂縫一旦在基層中產(chǎn)生，在環(huán)境和荷載因素作用下，會(huì)向上擴(kuò)展而使瀝青路面產(chǎn)生反射裂縫，反射裂縫也是我國(guó)西部地區(qū)危害路面安全的最主要病害之一。 首先，本文探究了半剛性瀝青路面的裂縫形成機(jī)理，并總結(jié)了路面裂縫常用預(yù)防措施。針對(duì)新疆地區(qū)常用的水泥穩(wěn)定砂礫半剛性基層，提出通過(guò)摻加聚酯纖維來(lái)提高其抗裂性。按照規(guī)范要求，對(duì)混合料的骨架密實(shí)型級(jí)配進(jìn)行合成級(jí)配設(shè)計(jì)，并按照丙法對(duì)水泥穩(wěn)定砂礫進(jìn)行電動(dòng)擊實(shí)試驗(yàn)，得出最大干密度和最佳含水量。試件在保證壓實(shí)度的前提下采用靜壓成型，在標(biāo)準(zhǔn)條件下養(yǎng)護(hù)規(guī)定齡期。然后通過(guò)無(wú)側(cè)限抗壓強(qiáng)度、抗彎拉強(qiáng)度和彎拉回彈模量試驗(yàn)及收縮試驗(yàn)，探究聚酯纖維對(duì)水泥穩(wěn)定砂礫的強(qiáng)度和抗變形能力的影響規(guī)律。 最后，分析了現(xiàn)有半剛性基層抗裂性的評(píng)價(jià)指標(biāo)和方法，總結(jié)了各評(píng)價(jià)方法的差異性。通過(guò)對(duì)纖維水泥穩(wěn)定砂礫進(jìn)行多指標(biāo)評(píng)價(jià)，找出纖維長(zhǎng)度和摻量的最佳組合。試驗(yàn)證明，聚酯纖維在水泥穩(wěn)定砂礫中充分發(fā)揮了增強(qiáng)、增韌和阻裂作用，聚酯纖維水泥穩(wěn)定砂礫抗裂效果較好。
[Abstract]:Semi-rigid base is the most commonly used base course in expressway and urban road construction in our country, and cement stabilized base is widely used because of its high strength and good plank etc. It is used as the most commonly used semi-rigid base in the west of China. Due to the inherent dry shrinkage and moisture rise of cement stabilized gravel, low temperature shrinkage and poor ability to resist bending deformation, cracking and deformation will inevitably occur. Once microcracks occur in the base, under the action of environment and load factors, The asphalt pavement will expand upward to produce reflective cracks, which are also one of the most important diseases that endanger the road safety in the western part of China. First of all, this paper probes into the crack formation mechanism of semi-rigid asphalt pavement, and summarizes the common preventive measures of pavement crack, aiming at the cement stabilized gravel semi-rigid base course commonly used in Xinjiang area. It is proposed to improve the crack resistance by adding polyester fiber. According to the specification, the composite gradation design of the framework dense gradation of the mixture is carried out, and the electric compaction test of cement stabilized gravel is carried out according to the C method. The maximum dry density and optimum moisture content are obtained. The specimen is formed under static pressure on the premise of ensuring compaction, and the age of the specimen is maintained under standard conditions. Then, through the unconfined compressive strength, The effects of polyester fiber on the strength and deformation resistance of cement stabilized sand gravel were investigated by means of flexural tensile strength and flexural elastic modulus test and shrinkage test. Finally, the evaluation indexes and methods of crack resistance of semi-rigid base are analyzed, and the differences of each evaluation method are summarized. The optimum combination of fiber length and content is found. The test results show that the polyester fiber can strengthen, toughen and prevent the crack in cement stabilized gravel, and the effect of polyester fiber cement stabilizing sand gravel is better.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.21

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