|Table of Contents|

Road performances and microcosmic mechanisms of granulated blast furnace slag asphalt mortar(PDF)

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

Issue:
2022年4期
Page:
20-29
Research Field:
道路工程
Publishing date:

Info

Title:
Road performances and microcosmic mechanisms of granulated blast furnace slag asphalt mortar
Author(s):
FENG Xin-jun1;  PENG Cheng1;  ZHANG Qiang1; 2;  AI Yu-peng3
(1. School of Traffic and Transportation Engineering, Changsha University of Science & Technology,Changsha 410114, Hunan, China; 2. Jiangsu Senmiao Engineering Quality Inspection CO., LTD, Zhenjiang 212028,Jiangsu, China; 3. Chengnan College, Changsha University of Science & Technology, Changsha 410015, Hunan, China)
Keywords:
road engineering;  granulated blast furnace slag powder;  asphalt mortar;  road performance;  microcosmic mechanism;  filler-asphalt ratio
PACS:
U416.217
DOI:
10.19721/j.cnki.1671-8879.2022.04.003
Abstract:
In order to broaden the reuse way of granulated blast furnace slag powder and explore the possibility of its application in asphalt pavement engineering, granulated blast furnace slag powder and limestone powder with the mass ratios of 0%, 25%, 50%, 75% and 100% were used to prepare asphalt mortar with 5 kinds of filler-asphalt ratios. Through routine tests, dynamic shear rheological test, curved beam rheological test, and Brookfield viscosity test, the variation law of asphalt mortar performance of granulated blast furnace slag powder with slag powder dosage and powder-binder ratio was studied. Through laser particle size distribution test, low-temperature nitrogen adsorption test, X-ray diffraction analysis, scanning electron microscopy test of the granulated blast furnace slag powder, and infrared spectroscopy test of the asphalt mortar, the microscopic mechanism of the granulated blast furnace slag powder asphalt mortar were studied. The results show that with the increase in the amount of granulated blast furnace slag powder, the high temperature performance of asphalt mortar has been on the rise, and the temperature sensitivity gradually decreases. Due to the combined effects of the different densities of granulated blast furnace slag powder and limestone powder, and the different selective adsorption capacity for asphalt, with the increase of the slag powder content, the low-temperature performance of the asphalt mortar shows a convex parabolic change, and reaches the optimum when the slag powder dosage(mass fraction, the same below)is 50%. Compared with limestone powder, granulated blast furnace slag powder has finer particles and a larger specific surface area, which improves its ability to interact with asphalt. Granulated blast furnace slag powder contains more slit holes, which can absorb light components such as aliphatic compounds in asphalt through capillary action, resulting increasing the content of heavy components in asphalt increase, thus improving the high-temperature performance of asphalt mortar and reducing its low temperature performance.4 tabs, 12 figs, 22 refs.

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Last Update: 2022-07-20