Influence of Aggregate Fineness Modulus on Compressive Strength and Heavy MetalLeachingof Lightweight Concrete Containing RecycledMelamine Waste
Chutpimuk Promchot * Pronpan Choedchai Chalermchai Chaitongrat Kanchala Sudtachat and Somsak Siwadamrongpong*
2School of Mechanical and Process System Engineering, Institute of Engineering, Suranaree University of Technology.

Abstract

This research aimed to investigate influence of aggregate fineness modulus on mechanical properties of cellular lightweight concrete containing melamine waste as fine aggregate. Melamine waste was used to partially replace sand at the rate of 25% by weight. The mixed ratio of cement: aggregate: water was set at 1:1:0.5 by weight. Density of fresh concrete was controlled at 1,300 kg/m3. The concrete specimens were varied by fineness modulus (FM) of the waste at FM1.25, FM1.0, FM0.75 and FM0.5. Compressive strength, water absorption and leaching test of heavy metal were investigated. The result was found that the melamine waste mixing yielded higher compressive strength and water absorption compared to reference lightweight concrete. The FM0.75 specimen resulted the highest compressive strength. It was also found that water absorption was slightly decrease with increasing fineness modulus of the waste. The leaching of heavy metals were determined by following the Toxicity Characteristic Leaching Procedure (TCLP). It was found that the concentration of As, Cd, and Pb were not exceed the limitation specified by the U.S.EPA and Ministry of Industry Announcement No. 6 (1997)
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Keywords : Fineness modulus, Leaching, Heavy metal, Lightweight concrete, Melamine waste