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Title: Strength Optimization of Novel Binder Containing Plasterboard Gypsum Waste

Author(s): Homayoon Sadeghi Pouya, Eshmeiel Ganjian, Peter Claisse, and Seema Karami

Publication: Materials Journal

Volume: 104

Issue: 6

Appears on pages(s): 653-659

Keywords: compressive strength; gypsum; pozzolan; slag

DOI: 10.14359/18970

Date: 11/1/2007

The sulfate activation of basic oxygen slag waste (BOS) using plasterboard gypsum waste (PG) and cement by-pass dust (BPD) was investigated to produce a novel composite binder without using portland cement. The interactions between these three waste-derived materials were analyzed in terms of strength development of binary and ternary paste mixtures to establish the optimum mixture proportions corresponding to the highest compressive strength. The results show that crushed plasterboard gypsum waste can be used as a source of sulfate to form a novel sulfate activated pozzolan binder. It was observed that the optimum percentage of BOS and PG is affected not only by the type and characteristics of materials used, but also the order of optimization with which binary and ternary mixtures were made. It was found that BPD content has a great influence on compressive strength of binary and ternary combinations of BPD, PG, and BOS pastes.