Abstract
As a multi-phase composite material consisting of porous asphalt mixture (PAM) and grouting material, pouring semi-flexible pavement (SFP) material has very complex mechanical properties. This research is to investigate the effect of different factors on bonding strength of cement-asphalt interface, the compressive strength, compressive modulus, and compressive strain energy density of SFP and the rough engineering estimate of the contribution rate of PMA and grouting material to the above properties. Firstly, the effects of asphalt type, water-cement ratio (W/C) and curing time on the bonding strength of cement-asphalt interface is studied by pull-out tests. Then, the effects of asphalt type, different void ratio of PAM and W/C of grouting materials on the mechanical properties of SFP are investigated by uniaxial compression tests. Finally, compressive strength, compressive modulus and strain energy density are used as to estimate the contribution rate of PAM and grouting materials to SPF. The results show that: reducing the W/C of grouting material and using asphalt with higher elasticity can significantly improve the bonding strength of asphalt-cement interface and the mechanical properties of SFP; when the void ratio of PAM is 25%, the SFP has the highest strain energy density; when the curing time is 28d, the contribution rate of grouting material to SFP in term of compressive strength, compressive modulus and strain energy density is much larger than that of PAM. To make full use of the dominant role of grouting materials in the compressive strength, resistance to deformation and fracture, asphalt with higher elasticity, grouting materials with lower W/C, and PAM with void ratio of 25% should be selected for the preparation of SFP.
Published Version
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