Comprehensive service properties evaluation of composite grouting materials with high-performance cement paste for semi-flexible pavement

In this paper, high-performance cement pastes (i.e. h2 and h3) and pure cement paste (s) are respectively grouted into matrix asphalt mixtures (porous asphalt concrete 13, PAC-13) to service as semi-flexible pavement materials, and the comprehensive service properties of these composite grouting materials (H2, H3 and S), including mechanics feature and pavement performance are measured and compared with those of the traditional dense-graded asphalt concrete. Test results show that these composite grouting materials have similar mechanics characteristics, and H2 and H3 possess better pavement performance and durability than S. From the contribution of two-phase material (matrix asphalt mixture and grouting material) of composite grouting material, it can be concluded that both contributive efficiency and contributive rate of matrix asphalt mixture are lower than those of the grouting material. The uniaxial compressive strength of composite grouting materials approaches to that of the grouting material, which is much higher than that of asphalt mixture (matrix asphalt mixture and AC-13); while, the compression resilient modulus of composite grouting materials quite approaches to that of the asphalt mixture. To meet the requirements on moisture susceptibility of dense-graded asphalt concrete, the air void of matrix asphalt mixture should reach 21% for grouting high-performance cement pastes, and 24% for grouting pure cement paste.