Development and Performance Study of New Infusion Mortar for Water-Retaining Asphalt Pavement

Abstract

The water-retaining asphalt pavement reduces the temperature of surface and adjacent atmosphere by evaporation, which is an effective measure to migrate the urban heat island effect, it was formed by pouring water-retaining mortar into the 1porous asphalt. Based on the performance analysis of water-retaining asphalt pavement's grouting mortar, the water-retaining mortar was prepared by mixing cement, diatomite filter aid, microsilica powder and water. The fluidity, flexural strength, compressive strength and water-retaining rate of the mortar were tested by Orthogonal experiment of water-powder ratio, diatomite filter aid content and microsilica powder content. Analytical method and variance analysis method are used to analyze the influence of each factor on the performance index of mortar. It is found that: (1) Diatomite filter aid and cement can be used to prepare homogeneous water-retaining mortar, and its mortar performances meet the requirement of the specification. (2) The content of diatomite filter aid has a significant effect on the flexural strength, compressive strength and water absorption of mortar, and the water-powder ratio has a significant effect on the fluidity. The amount of microsilica powder has no significant effect on the mortar's indexes, but the strength of the mortar increases slightly after the addition of microsilica powder. (3) Taking water retention rate as the main index, the recommended mass ratio of water-retaining mortar is cement: diatomite filter aid: water = 1:0.5:1.8.