|Table of Contents|

Rubber asphalt modification mechanism(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年02期
Page:
6-11
Research Field:
Publishing date:
2011-04-30

Info

Title:
Rubber asphalt modification mechanism
Author(s):
WANG Xiao-feng1; 2;  CAO Rong-ji3
1. Key Laboratory for Highway Construction Technology and Equipment of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Henan Province Communications Planning, Survey & Design Institute Co Ltd, Zhengzhou 450052, Henan, China; 3. Jiangsu Province Transportation Research Institute Co Ltd, Nanjing 211112, Jiangsu, China
Keywords:
road engineering;  asphalt;  rubber powder;  modification mechanism;  physical blend;  chemical reaction
PACS:
U416.217
DOI:
-
Abstract:
In light of the complexity of rubber asphalt modification mechanism, such means as scanning electron microscopy, infrared spectroscopy, differential thermal analysis, microscopic structure analysis, component analysis were adopted to study the components of the asphalt before and after modifying, and chemical analysis of rubber powder are adopted to study the modification mechanism of asphalt rubber blending system. The results indicate that the swollen rubber powder is mutually-adhered to form a network structure, and the matrix asphalt changes from homogeneous body into a two-phase continuous blending structure system constituted by rubber powder and asphalt; physical swelling dominates the system, accompanied by a little chemical reaction and with the prolongation of time, the chemical reaction becomes more obvious; the swollen rubber powder forms damping effects to improve the viscosity of rubber asphalt. The modification of asphalt comes from two aspects: firstly, the network structure formed by swollen rubber powder; secondly, the modification of the asphalt composition resulting from rubber powder desulphurization degradation. The natural rubber has better performance in modifying asphalt than synthetic rubber. 4 tabs, 9 figs, 12 refs.

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Last Update: 2011-04-30