Roller Compacted Concrete Pavement (RCCP) forms part of the road network linking dwellers in major oil palm plantation. These roads carry low traffic volume of less than 1000 vehicle per day which includes heavy
vehicles carrying palm fruits and timber logs. These heavy vehicles have high axle loads of up to 16 tons. The design life of RCCP is normally up to 40 years. It is common practice in Malaysia to rehabilitate failed RCCP
either by granular overlay or reconstruction. However, recycling technique has recently been introduced to treat failed RCCP as part of a comprehensive study on full depth Cold In-Place Recycling (CIPR). This paper presents the findings of a study on RCCP which was rehabilitated using the CIPR and conventional technique of granular overlay. Various stabilizing agents namely foamed bitumen, emulsion, cement and hydrated lime were used in the CIPR technique. This paper also highlights the tests involved in pavement evaluation carried out before and after construction, structural and mix design, as well as construction of the rehabilitated pavement. It was observed that minor and isolated cracks appeared as early as 12 months after construction on the foamed bitumen and emulsion treated sections. Whereas, for the cement and hydrated lime treated sections, similar degree of cracks appeared only after 36 months. The control section has not exhibited any crack. No rutting was observed on all sections. The International Roughness Index (IRI) measured 6 months after construction ranged between 2.0-2.5 m/km. After 36 months the IRI values had increased to between 2.5-3.5 m/km, with the cement treated section being the highest and the foamed bitumen section being the lowest.
Based on the Falling Weight Deflectometer (FWD) test carried out 6 months after the construction, it was found that all treatments had reduced the pre-construction central deflection values of between 400-800 μm
(microns) to between 250-380 μm. From 6 to 24 month period, the central deflections reduced further before they started to increase. After 36 month the control section had the highest central deflection while the foamed bitumen treated section had the lowest value. The monitored performance up to 36 months indicated that in general all sections performed similarly. Therefore, it could be concluded that the recycling technique provide a viable and cost effective option to rehabilitate RCCP.