【摘要】：瀝青混凝土因具有極佳的防滲性能被廣泛應(yīng)用于瀝青混凝土心墻壩中。在工程實(shí)踐中水工瀝青混凝土得到了迅速發(fā)展,但在材料研究方面還顯得不夠完善。進(jìn)行瀝青混凝土配合比設(shè)計(jì)時(shí),為保證骨料與瀝青的粘附性及心墻的防滲安全可靠性,瀝青混凝土骨料一般都選用了堿性巖石破碎的碎石。但人工破碎巖石成本高,且?guī)硪欢ǖ沫h(huán)境問題,而在新疆地區(qū),天然礫石骨料分布范圍廣、可就地取材、方便經(jīng)濟(jì)。由于天然礫石骨料巖性復(fù)雜,酸堿性不宜判斷,用天然礫石骨料配制的瀝青混凝土粘附性能能否達(dá)到堿性破碎骨料的要求,仍需進(jìn)一步的研究和試驗(yàn)論證。本文主要從天然礫石骨料界面和瀝青膠漿兩方面考慮,分別分析了天然礫石骨料酸堿性的判定方法,研究了不同瀝青膠漿的物理力學(xué)性能,在此基礎(chǔ)上進(jìn)一步研究了礫石骨料界面與瀝青膠漿的粘附強(qiáng)度,以骨料界面與瀝青膠漿的拉伸強(qiáng)度這一力學(xué)性能作為評(píng)價(jià)二者粘附性優(yōu)劣的直接指標(biāo),結(jié)論如下:(1)在工程實(shí)踐中,應(yīng)該首先采用巖相法對(duì)礫石骨料的酸堿性進(jìn)行初步判定,再采用SiO2含量法和堿值法進(jìn)行綜合判定。堿度模數(shù)法不建議采用。(2)填料濃度在很大程度上影響瀝青膠漿的性能,相同試驗(yàn)條件下,填料濃度越大,瀝青膠漿的針入度越小,軟化點(diǎn)越高,拉伸強(qiáng)度越大;填料級(jí)配也會(huì)影響瀝青膠漿的性質(zhì),填料級(jí)配越細(xì),瀝青膠漿的針入度越小,軟化點(diǎn)越高,拉伸強(qiáng)度越大。(3)保證填料級(jí)配相同,在相同的骨料界面上,水泥瀝青膠漿比石灰石粉瀝青膠漿有更強(qiáng)的粘附性,且在48h浸水作用以后,水泥瀝青膠漿與花崗巖骨料界面的拉伸強(qiáng)度仍然大于石灰石粉瀝青膠漿與花崗巖骨料界面的拉伸強(qiáng)度,水泥瀝青膠漿有更強(qiáng)的抵抗水損害作用的能力。花崗巖骨料界面與瀝青膠漿的拉伸強(qiáng)度也隨填料濃度的增加而增大。(4)試驗(yàn)研究和工程實(shí)踐均已證明以水泥為填料不僅可以有效提高瀝青與骨料的粘附性,還可以很好的改善瀝青混凝土的施工和易性,提高心墻瀝青混凝土的變形能力。
[Abstract]:Asphalt concrete is widely used in asphalt concrete core dam because of its excellent impermeability. Hydraulic asphalt concrete has been developed rapidly in engineering practice, but it is not perfect in material research. In order to ensure the adhesion between aggregate and asphalt and the safety and reliability of core wall, asphalt concrete aggregate is generally selected alkaline rock crushed stone in the design of asphalt concrete mix ratio. However, the cost of artificial rock crushing is high, and it brings some environmental problems. In Xinjiang, natural gravel aggregate is widely distributed and can be obtained locally, which is convenient for economy. Because of the complex lithology of natural gravel aggregate, it is not suitable to judge acid and alkalinity. Whether the adhesion property of asphalt concrete prepared with natural gravel aggregate can meet the requirement of alkaline crushed aggregate still needs further study and test. In this paper, considering the interface of natural gravel aggregate and asphalt mortar, the methods of judging the acidity and basicity of natural gravel aggregate are analyzed, and the physical and mechanical properties of different asphalt mortar are studied. On the basis of this, the adhesion strength between gravel aggregate interface and asphalt mortar is further studied. The mechanical properties of aggregate interface and asphalt mortar are taken as the direct indexes to evaluate the adhesion between them. The conclusions are as follows: (1) in engineering practice, we should first use lithofacies method to determine the acidity and basicity of gravel aggregates, and then use SiO2 content method and alkali value method to comprehensively judge the acidity and basicity of gravel aggregates. The alkalinity modulus method is not recommended. (2) the concentration of filler greatly affects the performance of asphalt mortar. Under the same experimental conditions, the greater the filler concentration, the smaller the penetration of asphalt mortar, the higher the softening point and the greater the tensile strength; Filler gradation will also affect the properties of asphalt mortar. The finer the filler gradation, the smaller the penetration of asphalt mortar, the higher the softening point, and the greater the tensile strength. (3) ensuring the same filler gradation, at the same aggregate interface, The cement asphalt paste has stronger adhesion than limestone powder asphalt mortar, and after 48 hours of soaking, The tensile strength of the interface between cement asphalt mortar and granite aggregate is still higher than that between limestone powder asphalt mortar and granite aggregate, and cement asphalt mortar has stronger ability to resist water damage. The tensile strength of the interface of granite aggregate and asphalt mortar also increases with the increase of filler concentration. (4) it has been proved by experiment and engineering practice that cement as filler can not only improve the adhesion of asphalt to aggregate effectively. It can also improve the construction and easiness of asphalt concrete and improve the deformation ability of core wall asphalt concrete.
【學(xué)位授予單位】：新疆農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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