硫磺瀝青在道路工程中的應(yīng)用研究
發(fā)布時間：2019-01-26 19:09
【摘要】：為了解決高等級路面出現(xiàn)的早期損害,延長道路使用壽命,國內(nèi)外采用了各種方法對瀝青進行改性。硫磺瀝青混凝土,即以硫磺為主要原料制成硫磺改性劑,經(jīng)拌合設(shè)備后生產(chǎn)出的瀝青混凝土。硫磺特有的優(yōu)點是可以明顯改善普通瀝青混凝土路面的高溫抗車轍性和低溫抗裂性,同時可以替代部分瀝青用量,缺點是在高溫作用下易產(chǎn)生H2S氣體,對人的身體健康造成較大危害。國外近年在發(fā)揮硫磺特性,減少有害氣體排放方面取得了突破,因此目前國內(nèi)使用的硫磺瀝青改性劑均從國外進口,尚無國產(chǎn)的硫磺瀝青改性粒料研發(fā)。本論文簡述了國產(chǎn)硫磺瀝青改性劑(MSP)的研制過程,即采用硫磺為主要材料,添加一定劑量的H2S抑制劑、抑制助劑、增塑劑和填料,經(jīng)高溫攪拌后急速冷卻形成固體顆粒。通過與純硫磺和進口同類產(chǎn)品橫向比較高溫下H2S的釋放量,初步確定國產(chǎn)MSP的配方。國產(chǎn)配方在高溫H2S氣體的排放上取得了進展,其釋放量相比進口產(chǎn)品有明顯下降。將不同的配方進行瀝青混凝土室內(nèi)試驗,通過標(biāo)準(zhǔn)馬歇爾、浸水馬歇爾、動穩(wěn)定度和凍融劈裂等試驗對各種配方樣品與進口同類產(chǎn)品進行路用性能的比較,基本相當(dāng),特別在動穩(wěn)定度結(jié)果上有顯著提高。綜合考慮,確定了一個最優(yōu)配方進行工業(yè)放大生產(chǎn)和現(xiàn)場試驗段的鋪筑。論文對工業(yè)放大生產(chǎn)的工藝流程和設(shè)備也進行了介紹。在后場拌合時,需要增加一臺與瀝青拌合樓操作系統(tǒng)聯(lián)動的MSP自動稱量添加裝置,適當(dāng)延長拌合時間�，F(xiàn)場施工時,與進口產(chǎn)品相比,能明顯地減少在施工中的發(fā)煙、異味,降低攤鋪溫度。論文對運輸、攤鋪、碾壓和養(yǎng)護等工藝進行了總結(jié)。試驗段檢測結(jié)果表明,國產(chǎn)硫磺瀝青改性劑(MSP)可以有效提高普通瀝青混凝土性能,部分驗收實測數(shù)據(jù)達(dá)到甚至超過進口產(chǎn)品,試驗路段彎沉達(dá)到設(shè)計要求,動態(tài)模量與進口產(chǎn)品路面性能相當(dāng)。國產(chǎn)硫磺改性劑的成本目前較進口產(chǎn)品低約15-20%,在今后的施工中,在達(dá)到相同路用性能的前提下,由于硫磺價格下跌及量化產(chǎn)量提高,MSP的價格將繼續(xù)降低,國產(chǎn)MSP可以降低工程造價,延長道路使用壽命,有著良好的發(fā)展前景。
[Abstract]:In order to solve the early damage of high grade pavement and prolong the service life of road, various methods have been adopted to modify asphalt at home and abroad. Sulfur bituminous concrete is a kind of asphalt concrete which is made from sulfur as the main raw material and is produced by mixing equipment. The unique advantage of sulfur is that it can obviously improve the rutting resistance at high temperature and crack resistance at low temperature of ordinary asphalt concrete pavement, and it can also replace some asphalt dosage. The disadvantage is that it can easily produce H2S gas under the action of high temperature. It does great harm to people's health. In recent years, a breakthrough has been made in the use of sulfur characteristics in foreign countries to reduce harmful gas emissions. Therefore, the domestic sulfur asphalt modifiers are imported from abroad, and there is no domestic research and development of sulfur asphalt modified granular materials. In this paper, the preparation process of domestic sulfur asphalt modifier (MSP) is briefly described, that is, sulfur is used as the main material, a certain amount of H _ 2S inhibitor is added, the additives, plasticizers and fillers are inhibited, and the solid particles are formed by rapid cooling after stirring at high temperature. The formulation of domestic MSP was preliminarily determined by comparing the amount of H _ 2S released at high temperature with pure sulfur and imported products of the same kind. The domestic formulation has made progress in the emission of H2S gas at high temperature, and its emission quantity is obviously lower than that of the imported products. Through standard Marshall, immersion Marshall, dynamic stability and freeze-thaw splitting tests, the road performance of different formula samples is basically equivalent to that of imported similar products, the laboratory tests of asphalt concrete with different formulations are carried out, and the performances of the different formulations are compared with those of the imported similar products through standard Marshall, immersion Marshall, dynamic stability and freeze-thaw splitting tests. Especially in the dynamic stability of the results have a significant improvement. An optimal formulation was determined for industrial production and field test section construction. The paper also introduces the process and equipment of industrial scale-up production. When mixing in the rear court, a MSP automatic weighing and adding device with the operation system of asphalt mixing plant should be added, and the mixing time should be extended appropriately. In site construction, compared with imported products, it can obviously reduce smoke, odour and spreading temperature in construction. In this paper, transportation, spreading, rolling and maintenance are summarized. The test results show that the domestic sulfur asphalt modifier (MSP) can effectively improve the performance of ordinary asphalt concrete, and some of the measured data of acceptance can reach or even exceed the imported products, and the deflection of the test section can meet the design requirements. The dynamic modulus is equivalent to the pavement performance of imported products. The cost of domestic sulfur modifier is about 15-20 lower than that of imported products at present. In future construction, under the premise of achieving the same road performance, the price of MSP will continue to decrease due to the decrease of sulfur price and the increase of quantitative output. Domestic MSP can reduce the project cost and prolong the service life of the road. It has a good development prospect.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
[Abstract]:In order to solve the early damage of high grade pavement and prolong the service life of road, various methods have been adopted to modify asphalt at home and abroad. Sulfur bituminous concrete is a kind of asphalt concrete which is made from sulfur as the main raw material and is produced by mixing equipment. The unique advantage of sulfur is that it can obviously improve the rutting resistance at high temperature and crack resistance at low temperature of ordinary asphalt concrete pavement, and it can also replace some asphalt dosage. The disadvantage is that it can easily produce H2S gas under the action of high temperature. It does great harm to people's health. In recent years, a breakthrough has been made in the use of sulfur characteristics in foreign countries to reduce harmful gas emissions. Therefore, the domestic sulfur asphalt modifiers are imported from abroad, and there is no domestic research and development of sulfur asphalt modified granular materials. In this paper, the preparation process of domestic sulfur asphalt modifier (MSP) is briefly described, that is, sulfur is used as the main material, a certain amount of H _ 2S inhibitor is added, the additives, plasticizers and fillers are inhibited, and the solid particles are formed by rapid cooling after stirring at high temperature. The formulation of domestic MSP was preliminarily determined by comparing the amount of H _ 2S released at high temperature with pure sulfur and imported products of the same kind. The domestic formulation has made progress in the emission of H2S gas at high temperature, and its emission quantity is obviously lower than that of the imported products. Through standard Marshall, immersion Marshall, dynamic stability and freeze-thaw splitting tests, the road performance of different formula samples is basically equivalent to that of imported similar products, the laboratory tests of asphalt concrete with different formulations are carried out, and the performances of the different formulations are compared with those of the imported similar products through standard Marshall, immersion Marshall, dynamic stability and freeze-thaw splitting tests. Especially in the dynamic stability of the results have a significant improvement. An optimal formulation was determined for industrial production and field test section construction. The paper also introduces the process and equipment of industrial scale-up production. When mixing in the rear court, a MSP automatic weighing and adding device with the operation system of asphalt mixing plant should be added, and the mixing time should be extended appropriately. In site construction, compared with imported products, it can obviously reduce smoke, odour and spreading temperature in construction. In this paper, transportation, spreading, rolling and maintenance are summarized. The test results show that the domestic sulfur asphalt modifier (MSP) can effectively improve the performance of ordinary asphalt concrete, and some of the measured data of acceptance can reach or even exceed the imported products, and the deflection of the test section can meet the design requirements. The dynamic modulus is equivalent to the pavement performance of imported products. The cost of domestic sulfur modifier is about 15-20 lower than that of imported products at present. In future construction, under the premise of achieving the same road performance, the price of MSP will continue to decrease due to the decrease of sulfur price and the increase of quantitative output. Domestic MSP can reduce the project cost and prolong the service life of the road. It has a good development prospect.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414
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