本文選題：天然礫石骨料　切入點(diǎn)：瀝青混凝土心墻　出處：《新疆農(nóng)業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：為研究和探討天然礫石骨料在瀝青混凝土心墻中的適用性，結(jié)合新疆五一水庫(kù)工程，通過(guò)黏附性試驗(yàn)，研究了不同巖性天然礫石骨料與純?yōu)r青之間的黏附性能；在瀝青中分別加入水泥、消石灰粉、白云巖粉、凝灰?guī)r粉制成不同的瀝青膠漿，進(jìn)行不同巖性天然礫石骨料與不同瀝青膠漿的黏附性試驗(yàn)，探討了增強(qiáng)骨料與瀝青黏結(jié)力的措施及其效果；采用正交設(shè)計(jì)試驗(yàn)方法進(jìn)行天然礫石骨料瀝青混凝土配合比設(shè)計(jì)，選定粗骨料最大粒徑為19mm，擬定級(jí)配指數(shù)、填料用量、瀝青用量為三個(gè)因素，，每個(gè)因素取3個(gè)水平值，以馬歇爾穩(wěn)定度、流值、試件的密度、孔隙率為考核指標(biāo)，優(yōu)選出最優(yōu)配合比，并進(jìn)行壓縮試驗(yàn)、滲透試驗(yàn)、小梁彎曲試驗(yàn)、水穩(wěn)定性試驗(yàn)、真空飽和浸水馬歇爾試驗(yàn)和凍融劈裂試驗(yàn)，對(duì)天然礫石骨料在瀝青混凝土心墻中的適用性進(jìn)行了分析、評(píng)價(jià)；討論了現(xiàn)行水工瀝青混凝土試驗(yàn)規(guī)程中有關(guān)黏附性試驗(yàn)、水穩(wěn)定性試驗(yàn)存在的若干問(wèn)題，并依據(jù)試驗(yàn)結(jié)果提出了建議。所得主要結(jié)論如下： （1）五一水庫(kù)天然礫石骨料主要由三種巖石組成，其中，75%為凝灰?guī)r，呈中性；17%為斑狀安山巖，呈酸性；8%為花崗巖，呈酸性。 （2）按現(xiàn)行水工瀝青混凝土試驗(yàn)規(guī)程規(guī)定的浸煮時(shí)間3min，無(wú)法明顯區(qū)分出酸性骨料與堿性骨料在黏附性上的差別；當(dāng)延長(zhǎng)浸煮時(shí)間9min后，不同巖石骨料與瀝青的黏附性差異才能較好的體現(xiàn)出來(lái)。因此，建議延長(zhǎng)黏附性試驗(yàn)的浸煮時(shí)間，并提出與延長(zhǎng)浸煮時(shí)間相匹配的黏結(jié)力等級(jí)評(píng)定的新標(biāo)準(zhǔn)。 （3）骨料與瀝青膠漿的黏附性不僅與骨料的巖性有關(guān)，而且與瀝青混凝土中的填料性質(zhì)有密切關(guān)系。不同類型的堿性添加料對(duì)不同巖性骨料黏附性的改善效果有所不同。對(duì)五一水庫(kù)的天然礫石骨料而言，在瀝青中摻入水泥對(duì)黏附性的改善效果最好。 （4）優(yōu)選出的五一水庫(kù)天然礫石骨料瀝青混凝土配合比為級(jí)配指數(shù)0.36、瀝青用量6.4%、填料用量11%；水泥既作為填料又兼做改善骨料與瀝青黏附性的措施。天然礫石骨料瀝青混凝土相關(guān)性能試驗(yàn)結(jié)果表明采用水泥作為填料對(duì)于天然礫石骨料的黏附性具有明顯的改善作用，天然礫石骨料瀝青混凝土試驗(yàn)性能均符合規(guī)范要求，且可近似地達(dá)到白云巖骨料瀝青混凝土的性能。 （5）現(xiàn)行水穩(wěn)定性試驗(yàn)不能準(zhǔn)確評(píng)價(jià)水工瀝青混凝土的水穩(wěn)定性，建議進(jìn)一步開(kāi)展試驗(yàn)研究工作，探討、尋求其他輔助方法來(lái)綜合評(píng)價(jià)水工瀝青混凝土的水穩(wěn)定性。
[Abstract]:In order to study and discuss the applicability of natural gravel aggregate in asphalt concrete core wall, the adhesion properties between natural gravel aggregate and pure asphalt with different lithologic properties were studied by means of adhesion test in Wuyi Reservoir Project of Xinjiang. Cement, lime powder, dolomite powder and tuff powder were added to asphalt to make different asphalt paste, and the adhesion test of different lithologic natural gravel aggregate to different asphalt mortar was carried out. The measures to strengthen the adhesion between aggregate and asphalt and its effect are discussed, and the proportion of natural gravel aggregate asphalt concrete is designed by orthogonal design method. The maximum particle size of coarse aggregate is 19mm, and the gradation index and filler dosage are determined. The asphalt dosage is three factors, each factor takes three horizontal values, taking Marshall stability, flow value, density of the specimen, porosity as the assessment index, the optimum mix ratio is selected, and the compression test, permeation test, trabecular bending test are carried out. The applicability of natural gravel aggregate in asphalt concrete core wall was analyzed and evaluated by water stability test, vacuum saturated immersion Marshall test and freeze-thaw splitting test. This paper discusses some problems existing in the adhesion test and water stability test of hydraulic asphalt concrete in the current test code, and puts forward some suggestions based on the test results. The main conclusions are as follows:. 1) the natural gravel aggregate of Wuyi Reservoir is composed of three kinds of rocks, 75% of which are tuff, 17% of neutral rock are porphyry andesite, 8% of acid rock is granite, and 8% of acid is granite. (2) the difference in adhesion between acidic aggregate and alkaline aggregate can not be clearly distinguished by the soaking time of 3 mins in accordance with the current test code for hydraulic asphalt concrete, and when the soaking time is extended for 9 min, Therefore, it is suggested that the soaking time of the adhesion test should be prolonged, and a new standard for the evaluation of adhesion grade matching with the extended soaking time should be proposed. 3) the adhesion of aggregate to asphalt mortar is not only related to the lithology of aggregate, And it is closely related to the properties of fillers in asphalt concrete. The effect of different types of alkaline admixtures on the adhesion of different rock aggregates is different. For the natural gravel aggregate of Wuyi reservoir, Adding cement to asphalt is the best way to improve adhesion. The mixture ratio of natural gravel aggregate asphalt concrete selected from Wuyi Reservoir is 0.36 gradation index, 6.4asphalt content and 11filler content. Cement is used as filler as well as as a measure to improve the adhesion between aggregate and asphalt. The experimental results show that cement as filler can improve the adhesion of natural gravel aggregate obviously. The test performance of natural gravel aggregate asphalt concrete is in accordance with the requirements of the specification, and the performance of dolomite aggregate asphalt concrete can be approximately achieved. 5) the current water stability test can not accurately evaluate the water stability of hydraulic asphalt concrete. It is suggested that further research work should be carried out, and other auxiliary methods should be sought to comprehensively evaluate the water stability of hydraulic 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】：2014
【分類號(hào)】：TV641.41

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