Abstract

This study evaluated the feasibility of rapid in-situ strength test methods for asphalt-treated cold recycled (ATCR) pavements in Indiana, with a secondary objective of characterizing the dynamic modulus of a locally produced ATCR mixture for use as AASHTOWare Pavement ME Design inputs. The long-pin shear test (LPST) and short-pin raveling test (SPRT), developed through National Cooperative Highway Research Program (NCHRP) Project 09-62, were evaluated on a cold in-place recycling (CIR) project on SR 13 in Greenfield, Indiana. Field results for blow counts exceeded the proposed NCHRP threshold moments after compaction, with torque values approaching but not yet reaching the NCHRP criterion. Short-term monitoring during the first hours after compaction showed slight decreasing trends in both blow count and torque, the cause of which could not be confirmed with the available data. By Day 7, both threshold values were exceeded by a wide margin. Dynamic modulus testing of laboratory-compacted specimens yielded a calibrated sigmoidal master curve consistent with the NCHRP Report 863 reference range for CIR materials at intermediate temperatures. The results support the potential adoption of the LPST and SPRT as complementary indicators of curing readiness in Indiana, pending validation across additional field projects.

Keywords

cold recycling, asphalt-treated cold recycled pavements, long-pin shear test, short-pin raveling test, curing, dynamic modulus, construction quality assurance

Report Number

FHWA/IN/JTRP-2026/24

SPR Number

4822

Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, Indiana

Date of Version

2026

DOI

10.5703/1288284318705

Additional Files
SPR-4822 Technical Summary.pdf (1596 kB)
SPR-4822 Technical Summary
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