硅藻土改性沥青混合料的性能评价与改善机制

Performance Evaluation and Improving Mechanisms of Diatomite-Modified Asphalt Mixture.

作者信息

Yang Chao, Xie Jun, Zhou Xiaojun, Liu Quantao, Pang Ling

机构信息

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.

出版信息

Materials (Basel). 2018 Apr 27;11(5):686. doi: 10.3390/ma11050686.

DOI:10.3390/ma11050686

PMID:29702579

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5978063/

Abstract

Diatomite is an inorganic natural resource in large reserve. This study consists of two phases to evaluate the effects of diatomite on asphalt mixtures. In the first phase, we characterized the diatomite in terms of mineralogical properties, chemical compositions, particle size distribution, mesoporous distribution, morphology, and IR spectra. In the second phase, road performances, referring to the permanent deformation, crack, fatigue, and moisture resistance, of asphalt mixtures with diatomite were investigated. The characterization of diatomite exhibits that it is a porous material with high SiO₂ content and large specific surface area. It contributes to asphalt absorption and therefore leads to bonding enhancement between asphalt and aggregate. However, physical absorption instead of chemical reaction occurs according to the results of FTIR. The resistance of asphalt mixtures with diatomite to permanent deformation and moisture are superior to those of the control mixtures. But, the addition of diatomite does not help to improve the crack and fatigue resistance of asphalt mixture.

摘要

硅藻土是一种储量丰富的无机自然资源。本研究分为两个阶段来评估硅藻土对沥青混合料的影响。在第一阶段，我们从矿物学性质、化学成分、粒度分布、中孔分布、形态和红外光谱等方面对硅藻土进行了表征。在第二阶段，研究了含硅藻土沥青混合料的路用性能，包括永久变形、裂缝、疲劳和抗水损害性能。硅藻土的表征显示它是一种具有高二氧化硅含量和大比表面积的多孔材料。它有助于沥青吸收，从而增强沥青与集料之间的粘结。然而，根据傅里叶变换红外光谱的结果，发生的是物理吸收而非化学反应。含硅藻土的沥青混合料的抗永久变形和抗水损害性能优于对照混合料。但是，添加硅藻土无助于提高沥青混合料的抗裂和抗疲劳性能。