A review of grouting materials for pouring semi-flexible pavement: Materials, design and performance

Pouring semi-flexible pavement is composed of a porous asphalt mixture and special grouting materials. Such pavement shows good mechanical properties and road performance. As an important part of pouring semiflexible pavement, grouting materials play a key role in filling and strengthening the asphalt mixture, thus forming pavement with high performance. This paper reviews research to date that focuses on materials, design and performance of grouting materials. Design principles, materials, technical requirements, design methods as well as test methods are all summarized and discussed. The findings in this research show that there is still room for improvement in laboratory grouting materials as opposed to the commercial ones, especially in terms of fluidity and strength. Apart air-purifying and beautifying the environment, more potential functions of SFP may be explored based the unique grouts in the future. Hopefully, this review may offer researchers a comprehensive understanding of the design of grouting materials for pouring semi-flexible pavement and in turn promote the application of semi-flexible pavement.