硅藻土沥青胶浆抗老化微观机理及砂浆力学性能研究

发布时间：2018-03-25 05:01

本文选题：硅藻土　切入点：红外光谱　出处：《吉林大学》2015年硕士论文

【摘要】：硅藻土作为一种天然的无机矿料，在道路沥青行业应用越来越广泛。其独特的微孔隙结构使其具有优越的路用性能。除了对硅藻土作为一种改性剂进行研究外，本文还对硅藻土作为填料替代矿粉进行了探讨。本文从如下三个方面进行了研究：（1）对不同掺量（5%、10%和15%）的硅藻土沥青胶浆进行针入度指数体系指标试验，并与相同掺量的矿粉沥青胶浆对比，研究填料和掺量因素对硅藻土改性效果评价的影响。考虑到沥青胶浆与基质沥青体系的转化，仅仅用评价基质沥青的指标并不适用于评价沥青胶浆，本文增加了锥入度和测力延度两种评价沥青胶浆性能的试验，分别从高温和低温两方面对沥青胶浆物理力学性能进行了补充研究。研究发现，当硅藻土掺量为10%，，沥青胶浆各方面性能最佳，且与矿粉对比硅藻土对沥青老化有明显的改善作用。（2）为更深入地了解硅藻土对沥青老化的影响。本文应用傅里叶红外光谱试验从微观方面对硅藻土对沥青的改性机理和抗老化机理进行了定性及定量地分析。研究发现，硅藻土与沥青混合未发生化学反应，仅为简单的物理混合。而硅藻土对老化的抑制作用则是由于硅藻土特有的微孔隙结构，能吸附沥青中的轻质组分，从而阻碍了沥青的氧化老化。通过代表老化的官能团羰基（C=O）和亚砜基（S=O）的峰值大小，定量比较了不同掺量硅藻土对老化抑制作用的强弱，得到10%硅藻土掺量的沥青胶浆老化抑制作用最佳，这与基础试验得到的结果一致。（3）除了对硅藻土的改性作用进行研究，本文还探索以硅藻土部分和全部替代矿粉，研究硅藻土作为填料对沥青砂浆性能的影响。通过单轴压缩蠕变试验和低温劈裂试验对沥青砂浆力学性能进行研究。试验结果表明，当硅藻土替代比例为75%时，沥青砂浆试件力学特性和高温性能最佳，而当替代比例为100%时，沥青砂浆的低温抗裂性最强。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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