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Project Details

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Project Information Sheet

Characterization and treatment of pad marks on Indiana Limestone

Funding Source:	Indiana Limestone Institute
Status:	extended — Definition of status type
Project Director:	Margaret V. Ennis

Issue

Padding materials that are used to separate pieces of milled limestone can produce discoloration of the stone's surface when exposed to moisture for prolonged periods of time. The discoloration is viewed by architects and contractors as a significant problem. Although many experiments have been conducted to determine the cause of these pad marks, the problem of prevention or removal has not been solved.

Objective

Research is designed to identify the causes and composition of pad marks that develop on Indiana limestone so that they can be effectively removed and prevented.

Approach

Pad marks developed on milled limestone under controlled conditions underwent rigorous physical and chemical testing. A series of experiments identified treatments to successfully remove pad marks without damaging the finished surface of the limestone.

Products

The results of this study were published in A Study of the Remediation of Pad Marks on Indiana Limestone, by Margaret V. Ennis, 2006, Indiana Geological Survey Report of Progress 34.

Benefits

The ability of limestone producers to prevent or remove pad marks from milled Indiana limestone without damaging the milled surface significantly enhances the marketability of Indiana limestone.

Locations Affected:

Greene

Lawrence

Monroe

Owen

Indiana House Districts Affected:

none

Indiana Senate Districts Affected:

none

Indiana Congressional Districts Affected:

Information Updated February 2, 2007

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