【摘要】：隨著時(shí)代的進(jìn)步，汽車保有量的增加。人們對(duì)于公路交通運(yùn)輸通行能力的要求也在不斷的提高。然而在寒冷的冬季，由于路表積雪、結(jié)冰等因素，使得行駛在冰雪道路上的機(jī)動(dòng)車發(fā)生交通事故的概率提高至正常天氣狀態(tài)下的2倍，據(jù)不完全統(tǒng)計(jì)，冬季約15%～30%的交通事故都與路表積雪有關(guān)。因此，一種蓄鹽集料瀝青混合料自融雪路面設(shè)計(jì)在此被提出并予以驗(yàn)證。 對(duì)于菱鎂水泥，有碳化和水化兩種相變過程。配比合適的制品長期暴露于空氣環(huán)境時(shí)，隨著相變進(jìn)程的持續(xù)，會(huì)有MgCl2的形成并析出，當(dāng)在水環(huán)境作用下時(shí)會(huì)電離析出。對(duì)于MgCl2使用量偏少的配比，則會(huì)在制品表面形成Mg(OH)2沉淀，俗稱“返霜”現(xiàn)象；對(duì)于MgCl2使用量偏多的配比，過量的MgCl2會(huì)吸收空氣中的水分，從而在表面形成水滴，俗稱“返鹵”現(xiàn)象。對(duì)于不同情形析出的MgCl2與Mg(OH)2在水環(huán)境作用時(shí)都會(huì)形成稀溶液，并遵循依數(shù)性定理，這些都能夠被除冰融雪所運(yùn)用。 本文運(yùn)用菱鎂水泥為載體，在其中分別摻加氯鹽及有機(jī)鹽并按照不同成型工藝進(jìn)行菱鎂制品制作成型，成型制品經(jīng)養(yǎng)護(hù)破碎后參照集料的路用性能進(jìn)行蓄鹽集料的實(shí)驗(yàn)。實(shí)驗(yàn)得到靜壓法制得的少于20%氯鹽摻加量的蓄鹽集料能夠滿足集料的路用性能。 運(yùn)用擊實(shí)法實(shí)驗(yàn)得到本實(shí)驗(yàn)AC-13C混合料的最佳油石比為4.8%，鑒于前人研究結(jié)果，鹽分的摻入對(duì)油石比的影響很小，基本保持在0.1%左右這一規(guī)律，本實(shí)驗(yàn)采用4.8%的油石比作為蓄鹽集料混合料的最佳油石比，并進(jìn)行后續(xù)實(shí)驗(yàn)。 通過鹽分析出實(shí)驗(yàn)和電導(dǎo)率實(shí)驗(yàn)，在理論上確認(rèn)了蓄鹽集料混合料具有融雪性能，并在室內(nèi)實(shí)驗(yàn)中獲得了驗(yàn)證。在環(huán)境箱中進(jìn)行除冰實(shí)驗(yàn)時(shí)，除冰性能顯現(xiàn)得并不明顯，但實(shí)際路用除冰性能當(dāng)考慮行車荷載的作用條件。限于技術(shù)條件限制，，期待后續(xù)學(xué)者驗(yàn)證完善。
[Abstract]:With the progress of the times, car ownership has increased. People's demand for highway transportation capacity is also increasing. However, in the cold winter, due to snow on the road surface, ice and other factors, the probability of traffic accidents of motor vehicles travelling on icy roads is increased to twice that under normal weather conditions. According to incomplete statistics, About 15% of traffic accidents in winter are related to snow on the road surface. Therefore, a salt-storing aggregate asphalt mixture self-melting snow pavement design is proposed and verified. For magnesite cement, there are two kinds of phase transition processes: carbonation and hydration. When the product with suitable proportion is exposed to air environment for a long time, with the continuation of phase transition process, MgCl2 will be formed and precipitated, and ionized precipitation will occur when the product is exposed to water environment for a long time. For the proportion of less MgCl2, the surface of the product will form Mg (OH) _ 2 precipitation, commonly known as "defrosting" phenomenon; For the proportion of excessive MgCl2 usage, excessive MgCl2 will absorb water in the air, thus forming water droplets on the surface, commonly known as "halogen" phenomenon. For MgCl2 and Mg (OH) 2 precipitated under different conditions, dilute solutions are formed when they interact in water environment, and these can be used in deicing, melting and snowing. In this paper, magnesium magnesite cement is used as carrier, in which chlorine salt and organic salt are added respectively, and different forming processes are used to make magnesium magnesite product. After curing and crushing, the salt storage aggregate is tested according to the road performance of aggregate. The experimental results show that the salt storage aggregate with less than 20% chlorine salt added by hydrostatic pressure method can meet the road performance of the aggregate. The results of compaction experiment show that the optimum ratio of AC-13C mixture is 4.8. In view of the previous research results, the effect of salt on the ratio of oil to stone is very small, and the rule is kept at about 0.1%. In this experiment, the oil stone ratio of 4.8% is used as the best oil stone ratio of salt storage aggregate mixture, and the follow-up experiment is carried out. Through salt analysis experiment and electrical conductivity experiment, it is confirmed theoretically that salt storage aggregate mixture has snowmelt performance, and it is verified in laboratory experiment. The deicing performance is not obvious when the deicing experiment is carried out in the environment box, but the actual road deicing performance is considered when the driving load is taken into account. Limited to technical conditions, expect follow-up scholars to verify and perfect.
【學(xué)位授予單位】：長安大學(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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