The Effectiveness and Efficiency of Implementing Fast Set Concrete in Reparation and Reinstatement of Concrete Pavements

The aim of this research is to determine the average compressive strength of fast set concrete with different formulations and their viabilities to be adopted for reparation and reinstatement works in concrete pavements especially when time is critical consideration. Fosroc’s Patchroc Rapid Setting Patch (RSP) cement was used as one of the components of the concrete. Conventionally, the recommended thickness for fast set concrete is only up to 75mm. With the technical supports from Fosroc (UK), we made a breakthrough by manipulating the design mix ratio and allow the fast set concrete remains its optimum performance with thickness up to 400mm. For the testing methodology, ten batches of concrete cube samples were produced, and each batch consists of ten numbers of samples. We are working on different mix design to determine the design with highest strength. All samples are tested in laboratory to ascertain their compressive strengths at 3 hours, 4 hours, 5 hours, 6 hours, 1 day, 3 days, 7 days, 28 days, 60 days and 90 days. Findings and analysis from several successful fast set concrete projects in Singapore Changi Airport were carried out and the data will be presented in this paper as well. Based on the most recent results, we are able to produce fast set concrete that achieve initial compressive strength more than 40MPa at 3 hours and the strength is increasing gradually with time. The projects using fast set concrete in aircraft pavement reparation and reinstatement were effective and efficient with minimum disturbance to the aircraft operation. From these results, we can conclude that fast set concrete could bring remarkable benefits and contributions to reparation and reinstatement works on operational area. This is because fast set concrete able to gain high early strength and the time for closure can be reduced drastically.