Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Shaikh, HafizSubject: search.filters.subject.concrete

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    Mitigation of Delayed Ettringite Formation in Laboratory Specimens
    (2007-04-25) Shaikh, Hafiz; Amde, Amde; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The objective of this study was to determine if the growth of delayed ettringite formation (DEF) in existing concrete can be reduced or even prevented with commercial products. Additionally, the objectives were to determine if externally treating concrete specimens with water repellents and crystal growth inhibitors will decrease DEF-related expansion. The research required casting laboratory specimens for expansion and weight measurements, for strength testing, and for scanning electron microscope (SEM). Three of the four products, ChimneySaver, Dequest 2060S, and Good-Rite K752, reduced concrete expansion and weight change when compared to the control set. The study indicates that ettringite may have to be identified and mitigated early to prevent deleterious effects.