Mass transfer and adsorption of aggregate chemicalcomposition/emulsified asphalt system(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年3期
- Page:
- 22-32
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Mass transfer and adsorption of aggregate chemicalcomposition/emulsified asphalt system
- Author(s):
- YANG Yujing1; KONG Lingyun2
- （1. Luanlu Expressway Construction Co., Ltd., Sanmenxia 471500, Henan, China; 2. National Local JointEngineering Laboratory of Traffic Civil Engineering Materials, Chongqing JiaotongUniversity, Chongqing 400074, China）
- Keywords:
- road engineering; emulsified asphalt; electrical conductivity; aggregate; adsorption
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to explore the influence of chemical composition of aggregate, emulsifier content and solid content of aggregate on mass transfer and adsorption of emulsified asphalt, the specific surface area, surface energy, pH value and alkali value of main chemical compositions (SiO2, MgO, Al2O3, Fe2O3, CaO and CaCO3) of aggregate were tested. Two systems of soap/aggregate and emulsified asphalt/aggregate chemical composition were designed by orthogonal design method. The conductivities of the two systems were tested, and the correlation between the aggregate characteristics and conductivity ratios was analyzed. The results show that in terms of the characteristics of the chemical compositions of the aggregate, each characteristic value has significant difference, which can effectively distinguish the chemical composition of the aggregate, in terms of the material itself, the conductivity of the emulsifier SDBS solution is greater than that of the STAC solution, the conductivity of the stabilizer calcium chloride solution is much greater than that of the polyvinyl alcohol solution, and the conductivity of the pH regulator solution is relatively high. The conductivity of cationic (STAC) and anionic (SDBS) soap increased significantly with the increase of the concentration of emulsifier, stabilizer and pH regulator, the conductivity of cationic (STAC) and anionic (SDBS) soap changed little after shearing by colloidal mill and centrifugation by centrifuge, and the centrifugation time of soap is 15 min, the conductivity of soap/aggregate system increased significantly. Generally speaking, the conductivity of the system is greater than that of the emulsified/aggregate asphalt system. The chemical composition of the aggregate is a significant factor affecting the mass transfer and adsorption of the emulsified/aggregate asphalt system, in the cationic (STAC) emulsified asphalt, Al2O3 has the greatest influence on the conductivity ratio of the system, and the correlation between the pH value of the chemical of the aggregate and the conductivity ratio is obvious, and in the anionic (SDBS) emulsified asphalt, CaO and CaCO3 have the greatest influence on the conductivity ratio of the system. The alkali value of the chemical composition of the aggregate has obvious correlation with the conductivity ratio. 10 tabs, 8 figs, 30 refs.
Last Update: 2021-06-04