Design and Optimization of Pumice Stone Ash based Cementitious Grouts for Grouted Macadam

Abstract

A new method known as "Grouted Macadam”, or "Semi-Flexible Pavement" fills in open-graded asphalt concrete that has a high air void content by injecting or pouring specialized grouting materials. It is made without joints, contraction, or expansion and exhibits outstanding rut resistance. Additionally, these surfaces offer protection against fuel spillage. Flexible Pavements commonly experience rutting and fatigue distresses when subjected to extreme loading and weather conditions. In contrast, Rigid Pavements' building costs are high, the surface is rough, and it takes a while before it can be used for traffic. As a result, semi-flexible pavements can be used as an alternative to rigid and flexible pavements. Ordinary Portland Cement (OPC) has been partially replaced in the current investigation by Pumice Stone Ash (PSA) to create cementitious grouts. To prepare cement grouts, OPC is substituted with 5%, 10%, 15%, and 20% PSA, with a water-cement ratio of 0.30 to 0.40 and 1% superplasticizer. The grouts' flowability and compressive strength (7d and 28d) were also examined. Response Surface Methodology (RSM) was used for statistical analysis and optimization to identify the ideal composition of grouts. Semi-flexible specimens were created and put through performance tests (such as Marshal Stability and Resilient Modulus) based on the composition of the final chosen grouts. The specimen's resistance to fuel has also been examined. Environmental sustainability and a decrease in carbon footprint was achieved through recycling waste materials and cement replacement.