|Table of Contents|

Influence of fillerasphalt ratio on highandlowtemperatureperformance of asphalt mortar(PDF)

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

Issue:
2020年4期
Page:
14-26
Research Field:
道路工程
Publishing date:

Info

Title:
Influence of fillerasphalt ratio on highandlowtemperatureperformance of asphalt mortar
Author(s):
XU Xinquan1; 2;  TANG Shenggang1;  YANG Jun1
(1. School of Transportation， Southeast University, Nanjing 211189, Jiangsu, China；2. Guangdong Hualu Transport Technology Co.Ltd， Guangzhou 510420, Guangdong, China)
Keywords:
road engineering;  asphalt mortar;  fillerasphalt ratio;  hightemperature stability;  low temperature cracking resistance;  cement;  hydrated lime
PACS:
-
DOI:
-
Abstract:
In order to study the influence of the fillerasphalt ratio on the highandlowtemperature performance of asphalt mortar,and change of highandlowtemperature properties of asphalt mortar after replacing some mineral powder with cement or hydrated lime,the Brookfield viscometer (RTV) was used to study the changes of RTV of asphalt mortar under different temperatures and fillerasphalt ratios, the complex shear modulus G*, phase angle δ, rutting factor G*/sin (δ) and other indicators of asphalt mortar under different conditions were tested, by using the dynamic shear rheometer (DSR) to study the rheological properties of asphalt mortar at high temperature,and the bending beam rheometer (BBR) was used to test the stiffness modulus S and creep rate m of asphalt mortars with different temperatures, fillerasphalt ratios and substitutions of cement or hydrated lime in order to study the lowtemperature rheological properties of different asphalt mortars, the lowtemperature coefficient λ=S/m was introduced to further evaluate the lowtemperature performance of asphalt mortar, so as to comprehensively study the effects of different fillerasphalt ratios and different cement or hydrated lime substitutions on the highandlowtemperature performance of asphalt mortar. The results show that increasing the fillerasphalt ratio can improve the hightemperature stability of asphalt mortar, reduce the temperature sensitivity of asphalt mortar, but also reduce the lowtemperature cracking resistance of asphalt mortar, the recommended reasonable fillerasphalt ratio range is 1.0 to 1.3. Replacing some of the mineral powder with hydrated lime or cement has the same effect, which can improve the hightemperature stability of asphalt mortar but decrease the lowtemperature performance. When using cement, it is recommended that the amount of cement should be 20% of the quality of mineral powder to obtain batter economy and effect. When adopting hydrated lime, it is suggested that the amount of hydrated lime should be 20% of the quality of mineral powder, so that it will not have a more adverse impact on the lowtemperature performance of asphalt mortar.If necessary, it should be determined according to the actual engineering situation. 9 tabs, 24 figs, 35 refs.

References:

Memo

Memo:
-
Last Update: 2020-07-31