SUO L J, LI P L, WANG B G, et al.Biaxial compression test of asphalt mixture based on cubic specimen[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):203-210.

doi:10.16186/j.cnki.1673-9787.2021100015

Received:2021/10/10

Revised:2021/12/20

Published:2022/11/25

Biaxial compression test of asphalt mixture based on cubic specimen

SUO Lijun1,2, LI Peilong1, WANG Binggang1, ZHENG Chuanchao1

1.Key laboratory of Highway Engineering in Special Region of Ministry of Education，Chang’an University，Xi’an 710064，Shaanxi，China<br/>2.Civil and construction Engineering Department，Shanxi Institute of Technology，Yangquan 045000，Shanxi，China

Abstract:In order to study influence of the second principal stress on strength of asphalt mixture，based on cubic specimen，the biaxial test instrument is designed and the biaxial test of asphalt mixture is put forward.Strength of asphalt mixture in different condition is tested on the base of orthogonal experimental design，which includes three factors，such as axial number，temperature and loading velocity .The results show that，for a given significant level，orthogonal experimental design range analysis and variance analysis show that axial number has the most obvious influence on strength of asphalt mixture in three different factors，as followed by loading velocity.On the other hand，when test temperature interval is 5 centigrade，and test temperature is from 15 centigrade to 25 centigrade，variance analysis shows that temperature has not obvious influence on strength of asphalt mixture.Strain were 0.020（15 ℃），0.010（20 ℃）and 0.008（25 ℃）respectively，curves of stress and strain of different loading velocity in the same temperature are same.After that，curves of stress and strain go and increase nonlinearly.When bitumen-aggregate ratio values were bigger than 5%，biaxial cubic strength slowly，after that，biaxial cubic strength begin to decrease.Biaxial cubic strength decreases with the increasing voidage.

Key words:road engineering;asphalt mixture;biaxial compression strength

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