本文選題：脫硫灰 + 瀝青混凝土��； 參考：《武漢理工大學(xué)》2014年碩士論文

【摘要】：脫硫灰是燃煤煙氣脫硫過(guò)程中，脫硫劑CaCO3/Ca(OH)2漿液吸收SO2產(chǎn)生的一種工業(yè)副產(chǎn)物。實(shí)現(xiàn)脫硫灰的資源化利用，是從根本上解決煙氣脫硫工藝中脫硫副產(chǎn)物引起的一系列經(jīng)濟(jì)和環(huán)境問(wèn)題的有效途徑。本課題將脫硫灰作為無(wú)機(jī)瀝青抗剝落劑應(yīng)用于瀝青混合料中，并與當(dāng)前常用的抗剝落劑——水泥制備的改性瀝青混合料的水穩(wěn)定性能對(duì)比，研究脫硫灰對(duì)瀝青混合料的水穩(wěn)定性能的影響。 本文采用掃描電子顯微鏡(SEM)觀察脫硫灰的微觀形貌，采用熒光分析和X射線衍射(XRD)對(duì)脫硫灰進(jìn)行化學(xué)成分分析。通過(guò)研究拌合溫度下脫硫灰的質(zhì)量變化和差熱分析(TG-DSC)(0-250℃)考察脫硫灰的熱穩(wěn)定性能。采用改進(jìn)的水煮法和拉伸實(shí)驗(yàn)考察脫硫灰改善瀝青與集料粘結(jié)性能的效果。采用浸水馬歇爾實(shí)驗(yàn)、凍融循環(huán)試驗(yàn)、浸水車轍試驗(yàn)等評(píng)價(jià)脫硫灰瀝青混合料的水穩(wěn)定性能；脫硫灰瀝青混合料的路用性能則通過(guò)高溫車轍試驗(yàn)、低溫三點(diǎn)彎曲試驗(yàn)、四點(diǎn)彎曲試驗(yàn)來(lái)考察。以二水硫酸鈣和氫氧化鈣做填料制備瀝青混合料，采用凍融劈裂強(qiáng)度比做指標(biāo)，探索脫硫灰中的這兩種主要組分在對(duì)抗水損害中的作用。 脫硫灰沒(méi)有明顯的團(tuán)聚，顆粒分布范圍較窄，較為均勻，，主要的顆粒大小在5-10um范圍以內(nèi)，且脫硫灰顆粒的表面呈囊狀凸起。脫硫灰的化學(xué)成分分析表明脫硫灰的主要成分為CaSO4·2H2O， CaCO3和Ca(OH)2，同時(shí)還有CaSO3·0.5H2O。改進(jìn)的水煮法顯示集料表面脫硫灰瀝青膠漿的殘留比例達(dá)到了55.4%，高出普通礦粉膠漿7%，說(shuō)明脫硫灰的摻入可以提高瀝青膠漿的強(qiáng)度。 脫硫灰瀝青混合料的殘留穩(wěn)定度、凍融劈裂強(qiáng)度比、浸水車轍動(dòng)穩(wěn)定度均表現(xiàn)出對(duì)普通石灰石礦粉的明顯優(yōu)勢(shì)。且相較于水泥瀝青混合料其水穩(wěn)定性能也有所提高。高溫車轍、低溫三點(diǎn)彎曲試驗(yàn)、四點(diǎn)彎曲疲勞試驗(yàn)顯示，脫硫灰瀝青混合料的高溫抗變形能力、低溫抗裂性能、抗疲勞能均滿足規(guī)范要求或與水泥瀝青混合料相當(dāng)。因此脫硫灰應(yīng)用于瀝青混合料中能夠顯著的提高瀝青混合料的水穩(wěn)定性能，同時(shí)使瀝青混合料的路用性能不低于傳統(tǒng)填料制備的瀝青混合料。脫硫灰的兩種主要成分中，二水硫酸鈣能夠改善混合料的水穩(wěn)定性能，但效果有限，但是它的水化作用是脫硫灰瀝青混合料在多次凍融中發(fā)生強(qiáng)度回復(fù)的主要原因；而氫氧化鈣在抗水損害中發(fā)揮了主要作用。
[Abstract]:Desulphurization ash is an industrial by-product produced by the absorption of SO2 by desulfurizer CaCO3/Ca(OH)2 slurry in the process of flue gas desulfurization. Realizing the utilization of desulphurization ash is an effective way to solve a series of economic and environmental problems caused by desulfurization by-products in flue gas desulfurization process. In this paper, desulphurization ash is used as inorganic asphalt anti-stripping agent in asphalt mixture, and the water stability of modified asphalt mixture is compared with that of modified asphalt mixture prepared by cement, which is commonly used as anti-stripping agent. The effect of desulphurization ash on the water stability of asphalt mixture is studied. In this paper, scanning electron microscope (SEM) was used to observe the microstructure of desulfurization ash, and fluorescence analysis and X-ray diffraction (XRD) were used to analyze the chemical composition of desulfurization ash. The thermal stability of desulphurization ash was investigated by studying the mass change of desulphurization ash at mixing temperature and differential thermal analysis (DTA). The effect of desulphurization ash on the adhesion between asphalt and aggregate was investigated by improved boiling method and tensile test. The soaking Marshall test, freeze-thaw cycle test, immersion rutting test and so on are used to evaluate the water stability of desulphurized ash asphalt mixture, while the road performance of desulphurized ash asphalt mixture is evaluated by high temperature rutting test, low temperature three-point bending test, etc. Four point bending test to examine. The bituminous mixture was prepared with calcium sulfate dihydrate and calcium hydroxide as fillers. The effect of these two main components in desulphurization ash against water damage was explored by using the ratio of freezing and thawing splitting strength as the index. There is no obvious agglomeration of desulphurization ash, the particle distribution range is narrow and uniform, the main particle size is within 5-10um range, and the surface of desulphurization ash particles is cystic protruding. The chemical composition analysis of desulfurization ash shows that the main components of desulfurization ash are CaSO4 _ 2H _ 2O, CaCO3 and CaOH _ (2) H _ (2), as well as CaSO3 _ (0.5) H _ 2O. The improved water boiling method shows that the residual ratio of desulfurized ash asphalt slurry on aggregate surface reaches 55.4, which is higher than that of ordinary mineral powder paste, which indicates that the strength of asphalt mortar can be improved by adding desulfurization ash. The residual stability, freeze-thaw splitting strength ratio and dynamic stability of soaking rut of desulfurized ash asphalt mixture show obvious superiority to ordinary limestone ore powder. Compared with the cement asphalt mixture, the water stability of the mixture is also improved. The results of high temperature rutting, low temperature three point bending test and four point bending fatigue test show that the high temperature deformation resistance, low temperature crack resistance and fatigue energy of desulphurized ash asphalt mixture meet the requirements of the specification or are equivalent to the cement asphalt mixture. So desulphurization ash used in asphalt mixture can significantly improve the water stability of asphalt mixture, at the same time, the pavement performance of asphalt mixture is not lower than that of asphalt mixture prepared by traditional filler. Among the two main components of desulphurization ash, calcium sulfate dihydrate can improve the water stability of the mixture, but the effect is limited, but its hydration is the main reason for strength recovery of desulfurization ash asphalt mixture in many freeze-thaw. Calcium hydroxide plays a major role in water damage resistance.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U414

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