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Title:

Points of Consideration for Obtaining Cold In-Place Recycling Theoretical Maximum Specific Gravity

Accession Number:

01628573

Record Type:

Component

Abstract:

Cold in-place recycling (CIR) is a flexible-pavement rehabilitation technique which is becoming more heavily utilized. Since in-place density contributes to performance, accurate density measurements are important. While traditional asphalt concrete density measurement concepts have been soundly established, they have varied considerably for CIR. Recently, a volumetrics-based (i.e. maximum and bulk specific gravity (G sub mm and G sub mb)) density measurement method utilizing vacuum sealing (i.e. CoreLok®) was investigated with promise for CIR treated with bituminous and/or cementitious binders. Therein, CIR G sub mm (focus of this paper) was estimated using reclaimed asphalt pavement (RAP) G sub mm measured via vacuum sealing (ASTM D6857) alongside binder dosages and gravities as inputs in a gravity-proportioning equation. This paper builds on previous work with two objectives: evaluate reliability-based D6857 replication guidance and evaluate cement hydration effects on cement-treated CIR G sub mm . In all, 242 G sub mm results are presented. Similar reliability was obtained with D6857 with as many or fewer replicates than AASHTO T209. Cement-treated G sub mm was sensitive to physical state and cement content; cure time and cement hydration inconsistently affected G sub mm. The overall cement-treated CIR G sub mm recommendation is that a value of 0.15 (in place of the previously-recommended 0.10) is more appropriate for the term accounting for cement hydration in the gravity-proportioning equation.

Supplemental Notes:

This paper was sponsored by TRB committee AFH60 Standing Committee on Asphalt Pavement Construction and Rehabilitation.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-01082

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Cox, Ben C
Howard, Isaac L

Pagination:

15p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Identifier Terms:

CoreLok

Subject Areas:

Highways; Maintenance and Preservation; Materials

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-01082

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 10:18AM