本文選題：水泥乳化瀝青混合料 + 收縮系數(shù)�。� 參考：《長安大學(xué)》2014年碩士論文

【摘要】：水泥乳化瀝青混合料收縮性能主要受組成材料和外界環(huán)境溫度影響，尤其是水泥和乳化瀝青結(jié)合料，及其組成的復(fù)合膠漿與集料的相互作用對收縮性能有直接影響。 為研究在各個影響因素下，混合料收縮性能的變化情況，本文通過改變水泥、乳化瀝青的含量以及礦料級配類型，對混合料進行干燥收縮、溫度收縮等測試試驗，測得各個齡期時混合料收縮系數(shù)的變化規(guī)律，并探討變量因素對收縮性能的影響機理。結(jié)合光學(xué)顯微鏡、掃描電鏡(SEM)和X射線衍射(XRD)等微觀手段觀測水泥乳化瀝青膠漿的微觀結(jié)構(gòu)，及水泥-乳化瀝青膠漿在混合料中的存在狀態(tài)，分析其影響機理。 試驗數(shù)據(jù)及相關(guān)微觀圖表明：隨著齡期的增長，混合料的收縮率隨著水泥用量增加而減小，隨著乳化瀝青用量增加而增大；水泥乳化瀝青混合料中礦粉起填充作用，，水泥水化作用產(chǎn)生大量結(jié)構(gòu)致密的結(jié)晶水化物，與破乳后的瀝青相互交織，提高了混合料結(jié)構(gòu)的致密性。而對于溫度的影響，在不同降溫區(qū)間，隨著水泥含量的增加，混合料的收縮系數(shù)都減��；剛性材料水泥的加入減弱了混合料的柔性，溫度敏感性降低，提高了膠漿的粘度。而表征瀝青材料感溫性能的粘度，也用來衡量混合料的勁度模量，并直接影響到混合料的溫度應(yīng)力及應(yīng)變，從而決定了混合料的抗收縮開裂性能。文中分別采用了AC-5、AC-10、AC-13礦料級配，對比研究發(fā)現(xiàn)，粗級配的混合料中含有較多粗集料，其收縮性能好；而細級配的混合料中細集料多，密實度高，不利于溫度應(yīng)力的釋放，溫度收縮開裂性較嚴重。 最后根據(jù)水泥乳化瀝青混合料收縮行為產(chǎn)生的原因，提出了混合料的收縮模型，通過測得各個材料物性指標(biāo)，進行收縮系數(shù)的驗證，計算的結(jié)果與試驗測得的數(shù)值接近。
[Abstract]:The shrinkage performance of cement emulsified asphalt mixture is mainly affected by composition material and ambient temperature, especially the interaction between cement and emulsified asphalt binder, and the interaction between composite mortar and aggregate. In order to study the change of the shrinkage performance of the mixture under various influence factors, the dry shrinkage and temperature shrinkage of the mixture were tested by changing the content of cement, emulsified asphalt and the type of aggregate gradation. The variation law of shrinkage coefficient of mixture at different ages was measured and the influence mechanism of variable factors on shrinkage performance was discussed. Combined with optical microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD), the microstructure of cement emulsified asphalt slurry and the existing state of cement emulsified asphalt slurry in mixture were observed, and its influence mechanism was analyzed. The experimental data and related micrographs show that the shrinkage of the mixture decreases with the increase of cement content and increases with the increase of emulsified asphalt content, and the mineral powder plays a filling role in cement emulsified asphalt mixture. Cement hydration produces a large number of dense crystalline hydrates which interweave with asphalt after demulsification and improve the compactness of mixture structure. For the effect of temperature, the shrinkage coefficient of the mixture decreases with the increase of cement content in different cooling areas, and the flexibility of mixture is weakened and the temperature sensitivity decreases with the addition of rigid material cement, and the viscosity of mortar is improved. The viscosity of asphalt material is also used to measure the stiffness modulus of the mixture and directly affect the temperature stress and strain of the mixture, which determines the shrinkage and cracking resistance of the mixture. In this paper, AC-5 AC-10 AC-13 mineral aggregate gradation is adopted respectively. The comparison study shows that the coarse gradation mixture contains more coarse aggregate and its shrinkage performance is good, while the fine grained mixture has many fine aggregates and high compactness, which is not conducive to the release of temperature stress. The temperature shrinkage cracking is more serious. Finally, according to the reason of shrinkage behavior of cement emulsified asphalt mixture, the shrinkage model of the mixture is put forward. The shrinkage coefficient is verified by measuring the physical properties of each material, and the calculated results are close to the experimental values.
【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】：U414

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