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Item Information   Holdings       More by this author     Christiansen, Mary     Subjects     Concrete -- Additives     Recycling (Waste, etc.) -- United States     Drywall -- Recycling -- United States     MSST Project.     Browse Catalog     by author:      Christiansen, Mary       by title:      An analysis of concr...         MARC Display

An analysis of concrete performance : increasing the gypsum content / Mary Christiansen. by Christiansen, Mary Subjects Concrete -- Additives   Recycling (Waste, etc.) -- United States   Drywall -- Recycling -- United States   MSST Project. Description:  61 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. Douglas Stahl Committee members: Dr. Carol Diggelman, Dr. Hans-Peter Huttelmaier Introduction and project goals -- The role of gypsum in Portland cement -- Literature review -- Hypothesis and testing plan -- Experimentation -- Results and conclusions. Construction and demolition debris account for over 12% of the material in our nation's landfills. Of that 12%, approximately one fifth is comprised of scrap gypsum wallboard. Gypsum wallboard is often sent to landfills because in many cases there is no strong end market for recycling it. The purpose of this project was to analyze the performance of concrete mixes when ground recycled gypsum wallboard is added in various amounts. Concrete is the most widely used construction material on Earth. Using gypsum as an additive in concrete could be an economical way to use a material that would most likely be thrown into the landfill. Multiple concrete mixes with varying gypsum contents (from 5 to 15% by weight) were tested for compressive strength over a period of ten weeks. Three of the concrete mixes reached the required strength of 4700 psi, though several mixes took longer than others to achieve the design strength. The batches that had more than 4% gypsum by weight added did not reach the required strength. Based on this research, it seems that for certain applications, such as backfill, foundation support, pavement base, conduit bedding, and architectural features or as fill for metal deck, a mix with a slightly increased gypsum content could produce acceptable concrete. Other properties, such as durability, shrinkage and expansion, and cracking need to be investigated further, but this experiment proves that design strength can be obtained if a long enough curing time is allowed.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .C46 2008 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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