Stabilization of Geothermal Residues by Encapsulation in Polymer Concrete and Portland Cement Mortar Composites: Preliminary Laboratory Test Results

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Title: Stabilization of Geothermal Residues by Encapsulation in Polymer Concrete and Portland Cement Mortar Composites: Preliminary Laboratory Test Results

Author(s): Ronald P. Webster and Lawrence E. Kukacka

Publication: Special Publication

Volume: 116

Issue:

Appears on pages(s): 97-112

Keywords: composite materials; encapsulating; hazardous materials; mortars (material); polymer concrete; portland cements; residues; stabilization; tests; waste treatment; Materials Research

Date: 8/1/1989

Abstract:
Results are presented from the preliminary phase of a laboratory test program conducted to identify and evaluate materials for converting hazardous geothermal residues to a nonhazardous and potentially usable form. Laboratory test results indicate that geothermal residues can be effectively incorporated as a fine aggregate into polymer concrete (PC) and portland cement mortar (PCM) composites. PC composites made using an emulsifiable polyester resin and a methyl methacrylate (MMA)-based monomer system exhibited compressive strengths varying between 3700 and 16,500 psi (25.5 and 113.8 MPa), depending upon the type of binder used and the moisture content of the residue. Waste extraction tests (WET) performed on ground samples of the composites indicate elemental levels of leachable heavy metals are below specified soluble threshold limit concentrations (STLC). PCM composites exhibited compressive strengths varying between 2875 and 5530 psi (19.8 and 38.1 MPa), depending upon the type, amount, and moisture content of the residue. WET analysis indicates elemental levels of leachable heavy metals are below specified STLC values for all but one of the PCM composites evaluated.