Utilization of Powdered Gypsum-Wallboard in Concrete
نویسندگان
چکیده
Two groups of concrete mixtures, one without sodium sulfate and other with sodium sulfate, as an activator, were made with recycled powdered gypsum-wallboard for this investigation. Group 1 concrete mixtures were made using up to 20% of ASTM Class C fly ash and 20% powdered gypsum while Group 2 contained up to 60% of fly ash and 20% of powdered gypsum by mass. Relevant properties of concrete were evaluated. The study revealed that up to 10% by mass of total cementitious materials could be replaced by powdered gypsum wallboard as a supplementary material without affecting the properties of concrete adversely. Such recycling of the gypsum-wallboard not only reduces the requirement for landfills but also reduces sulfur emissions from decaying gypsum-wallboards in landfills and emission of carbon dioxide and other greenhouse gases by saving the cement quantity in concrete mixtures.
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iii DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disc...
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