Open AccessUnconfined Compressive Strength of Rehabilitated Road Base via Polymer-Modified Cold In-Place Recycling (CIPR)
Author(s) -
Poi-Cheong Tan,
Chee-Ming Chan
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1150/1/012014
Subject(s) - cement , compressive strength , crusher , cementitious , asphalt , shrinkage , curing (chemistry) , materials science , environmental science , composite material , metallurgy
Cold In-Place Recycling (CIPR) is a road maintenance technology, which chemically stabilize, recycle and improve existing asphalt concrete together with road base underneath. Cement is the most common chemical for CIPR adopted in Malaysia. However, shrinkage crack remains as unresolved technical drawback of cement stabilization, road practitioners are always seeking alternative materials to replace cement in CIPR. A proprietary product, Polymer Modified Cementitious (PMC) chemical binder was identified as the research object to verify the suitability in CIPR application and to study the strength-gain over time, through laboratory testing. To replicate CIPR process, Crusher run (CR) and Recycled Asphalt Pavement (RAP) were mixed at various ratio to study the effect of CR to RAP ratio on strength gained; with PMC added in dosage between 2-4% per dry weight of the materials to compare strength gain at different dosage. Samples were compacted and cured for 7 days then subjected to Unconfined Compressive Test where the strength UCS (qu7) was recorded. Strength-gain over time from 1 day to 28 days, for a specific CR-RAP ratio at fixed PMC dosage was also studied. It was found that UCS was directly proportionate to PMC dosage and amount of CR component in the mixture. This study concluded that at various combination of CR-RAP ratio, with varying PMC dosage, minimum requirement of UCS (7-day) of 2 MPa for road base application specified by local authority is achievable. The correlation between strength and curing duration obtained serves as guideline to extrapolate long-term strength from short-term strength.