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Title:

Evaluation of a Chemical Hardening Process to Inhibit Aggregate Abrasion and Polishing

Accession Number:

01551607

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Aggregate polishing and degradation is a pavement performance problem for state highway agencies to manage. It creates a safety issue by reducing skid resistance and shortening pavement service life. An underutilized pavement preservation tool, Silicon Reactive Lithium Densifier and Shotblasting, can harden new and existing pavement and bridge deck surfaces to inhibit polishing and abrasion and retain skid resistance. Research to determine the efficacy of this treatment is limited because of its relatively recent emergence in highway applications. Therefore, the objective of this paper is to evaluate densifier-treated, virgin limestone aggregate characteristics in the laboratory that relate to highway performance in terms of abrasion resistance, skid resistance and aggregate polishing using Micro-Deval and aggregate image analysis testing methodology. The results demonstrate that chemically treating soft, virgin aggregate improves the hardness and durability of the aggregate. Additionally, the angularity of the chemically treated aggregate after polish-wear trended closer to the virgin aggregate, which received no abrasion polishing. This indicates that applying the chemical directly to the aggregate does indeed enhance abrasion resistance. The paper concludes that there are potential benefits to adopting lithium-based, field treatments as a pavement preservation tool to enhance the ability of pavement engineers to maintain safe surface friction levels, inhibit polishing and keep good roads good.

Supplemental Notes:

This paper was sponsored by TRB committee AHD18 Pavement Preservation. Alternate title: Evaluation of Chemical Hardening Process to Inhibit Aggregate Abrasion and Polishing

Monograph Accession #:

01550057

Report/Paper Numbers:

15-0378

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Cumberpatch, Liam
Pittenger, Dominique M
Zaman, Musharraf

Pagination:

11p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Shotblasting

Subject Areas:

Highways; Maintenance and Preservation; Materials; Pavements; Safety and Human Factors; I36: Aggregates; I61: Equipment and Maintenance Methods; I82: Accidents and Transport Infrastructure

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-0378

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 12:15PM