Unconfined Compressive Strength of Recycled Asphalt Pavement Improved by Hydraulic Cement

Abstract

This article studied the possibility of the use of recycle asphalt pavement improved by hydraulic cement for pavement base material. Recycle asphalt pavement (RAP) was obtained from a road construction project of Kalasin Rural Roads Office, Kalasin Province. The Independent variable of this research consisted of cement types (Hydraulic cement and ordinary Portland cement type 1), cement contents (1%, 3% and 5%) and condition of the 7-day unconfined compressive strength (UCS) test (soaked and unsoaked). The results showed that the 7-day UCS of RAP improved by cement increased as cement content increased due to the increase of calcium silicates hydrates (CSH) in the samples. The 7-day UCS of RAP improved by hydraulic cement was similar to that of RAP improved by Portland cement type 1. Whereas the 7-day soaked UCS of RAP improved by cement was lower than the 7-day unsoaked UCS for all cement types and cement contents.