# Design of Semi-Rigid Composite Highway Pavements Using Cementitious Grouting and Porous Asphalt

## TL;DR

This paper introduces a new type of highway pavement combining porous asphalt and cement grout to improve durability and cost-effectiveness.

## Contribution

A novel semi-rigid composite pavement design using high-fluidity cementitious grout and porous asphalt is proposed and tested.

## Key findings

- A grout mix with high workability and mechanical strength was identified for filling porous asphalt voids.
- The semi-rigid pavement showed superior performance characteristics in laboratory tests.
- The proposed design offers improved durability and cost-effectiveness for high-traffic highways.

## Abstract

Due to the increasing volume of traffic on the world’s highways, researchers have been searching for new composite techniques and methods to develop durable and cost-effective pavement structures. The semi-rigid pavement is a composite pavement consisting of a porous asphalt mix with air voids between 25 and 30% and a high-fluidity cementitious grout. In this study, different cementitious grout mixes were prepared. Then a porous asphalt mix with almost 30% air void content was designed. After evaluating the workability, mechanical strength, and volume stability of the prepared grout mixes, the most suitable mix is proposed to fill the voids in the porous asphalt mix. Finally, the prepared semi-rigid pavement specimens were subjected to various tests to evaluate the performance characteristics of the designed pavement. The research concludes that the grout mixture ratio proposed in this study has good grouting ability and the semi-rigid pavement has superior performance characteristics.