本文選題：硅藻土　切入點(diǎn)：紅外光譜　出處：《吉林大學(xué)》2015年碩士論文

【摘要】：硅藻土作為一種天然的無機(jī)礦料，在道路瀝青行業(yè)應(yīng)用越來越廣泛。其獨(dú)特的微孔隙結(jié)構(gòu)使其具有優(yōu)越的路用性能。除了對硅藻土作為一種改性劑進(jìn)行研究外，本文還對硅藻土作為填料替代礦粉進(jìn)行了探討。本文從如下三個方面進(jìn)行了研究： （1）對不同摻量（5%、10%和15%）的硅藻土瀝青膠漿進(jìn)行針入度指數(shù)體系指標(biāo)試驗(yàn)，并與相同摻量的礦粉瀝青膠漿對比，研究填料和摻量因素對硅藻土改性效果評價的影響�？紤]到瀝青膠漿與基質(zhì)瀝青體系的轉(zhuǎn)化，僅僅用評價基質(zhì)瀝青的指標(biāo)并不適用于評價瀝青膠漿，本文增加了錐入度和測力延度兩種評價瀝青膠漿性能的試驗(yàn)，分別從高溫和低溫兩方面對瀝青膠漿物理力學(xué)性能進(jìn)行了補(bǔ)充研究。研究發(fā)現(xiàn)，當(dāng)硅藻土摻量為10%，，瀝青膠漿各方面性能最佳，且與礦粉對比硅藻土對瀝青老化有明顯的改善作用。 （2）為更深入地了解硅藻土對瀝青老化的影響。本文應(yīng)用傅里葉紅外光譜試驗(yàn)從微觀方面對硅藻土對瀝青的改性機(jī)理和抗老化機(jī)理進(jìn)行了定性及定量地分析。研究發(fā)現(xiàn)，硅藻土與瀝青混合未發(fā)生化學(xué)反應(yīng)，僅為簡單的物理混合。而硅藻土對老化的抑制作用則是由于硅藻土特有的微孔隙結(jié)構(gòu)，能吸附瀝青中的輕質(zhì)組分，從而阻礙了瀝青的氧化老化。通過代表老化的官能團(tuán)羰基（C=O）和亞砜基（S=O）的峰值大小，定量比較了不同摻量硅藻土對老化抑制作用的強(qiáng)弱，得到10%硅藻土摻量的瀝青膠漿老化抑制作用最佳，這與基礎(chǔ)試驗(yàn)得到的結(jié)果一致。 （3）除了對硅藻土的改性作用進(jìn)行研究，本文還探索以硅藻土部分和全部替代礦粉，研究硅藻土作為填料對瀝青砂漿性能的影響。通過單軸壓縮蠕變試驗(yàn)和低溫劈裂試驗(yàn)對瀝青砂漿力學(xué)性能進(jìn)行研究。試驗(yàn)結(jié)果表明，當(dāng)硅藻土替代比例為75%時，瀝青砂漿試件力學(xué)特性和高溫性能最佳，而當(dāng)替代比例為100%時，瀝青砂漿的低溫抗裂性最強(qiáng)。
[Abstract]:Diatomite, as a kind of natural inorganic mineral, is more and more widely used in road asphalt industry. Its unique micro-pore structure makes it have superior road performance. In this paper, diatomite as filler instead of mineral powder is also discussed. The following three aspects have been studied in this paper:. (1) to test the penetration index system of diatomite bitumen mortar with 10% and 15% diatomite content, and compare it with the same amount of mineral powder asphalt mortar. The effect of filler and content on the evaluation of diatomite modification effect is studied. Considering the transformation of asphalt slurry and matrix asphalt system, it is not suitable to evaluate asphalt slurry only by evaluating the index of matrix asphalt. In this paper, two kinds of tests of cone penetration and force ductility are added to evaluate the properties of asphalt mortar. The physical and mechanical properties of asphalt mortar are studied from the aspects of high temperature and low temperature respectively. When the content of diatomite is 10%, the properties of asphalt paste are the best, and diatomite can obviously improve the aging of asphalt compared with mineral powder. In order to better understand the effect of diatomite on asphalt aging, the modification mechanism and anti-aging mechanism of diatomite on asphalt were analyzed qualitatively and quantitatively by Fourier transform infrared spectroscopy (FTIR). There is no chemical reaction between diatomite and bitumen, which is only a simple physical mixture. The inhibition of diatomite on aging is due to the micropore structure of diatomite, which can adsorb the light component of asphalt. Therefore, the oxidation aging of asphalt was hindered. The peak values of the functional groups (carbonyl) and sulfoxyl group (Schio), which represent aging, were compared quantitatively to compare the effect of diatomite with different contents on the inhibition of aging. The aging inhibition effect of 10% diatomite added asphalt slurry is the best, which is consistent with the results obtained from the basic test. In addition to the study on the modification of diatomite, this paper also explores the substitution of some and all diatomite for mineral powder. The effect of diatomite as filler on the properties of asphalt mortar was studied. The mechanical properties of asphalt mortar were studied by uniaxial compression creep test and low temperature splitting test. The mechanical properties and high temperature properties of asphalt mortar specimens are the best, but when the substitution ratio is 100, the low temperature crack resistance of asphalt mortar is the best.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

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