An Investigation of Emulsion Stabilized Limestone Screenings, HR-309, 1994

(1994) An Investigation of Emulsion Stabilized Limestone Screenings, HR-309, 1994. Transportation, Department of

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Abstract

A significant amount of waste limestone screenings is produced during aggregate production. This waste material cannot be used in highway construction because it does not meet current highway specifications. The purpose of this research was to determine if a waste limestone screenings/emulsion mix could be used to construct a base capable of supporting local traffic. A 1.27 mile (2.04 km) section of roadway in Linn County was selected for this research. The road was divided into seven sections. Six of the sections were used to test 4 in. (100 mm) and 6 in. (150 mm) compacted base thicknesses containing 2.5%, 3.5%, and 4.5% residual asphalt contents. The seventh section was a control section containing untreated waste limestone screenings. This research on emulsion stabilized limestone screenings supports the following conclusions: (1) A low maintenance roadway can be produced using a seal coat surface on 6 in. (150 mm) of stabilized limestone screenings with 4.5% asphalt cement; (2) A 6 in. (150 mm) emulsion stabilized base with less than 3.5% asphalt cement does not produce a satisfactory low cost maintenance roadway; (3) A 4 in. (100 mm) emulsion stabilized base does not produce a satisfactory low cost maintenance roadway; and (4) A 2 in. (50 mm) asphalt concrete surface would be necessary on many roads to provide a low maintenance roadway using emulsion stabilized limestone screenings.

Item Type: Departmental Report
Keywords: Asphalt content, Asphalt emulsions, Base course (Pavements), Field tests, Limestone, Screenings, Seal coats, Thickness
Subjects: Transportation > Pavements
Transportation
Transportation > Roads and highways
Transportation > Research
Transportation > Design and Construction
ID Code: 16068
Deposited By: Iowa DOT Library
Deposited On: 11 Feb 2014 13:08
Last Modified: 22 Sep 2014 11:43
URI: http://publications.iowa.gov/id/eprint/16068