Utilization of by-product gypsum in road construction /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | By-product gypsum (BPG) systems are the waste materials resulting from either industrial processes or environmental control operations. Estimated 800 million tons are stockpiled in the U.S.A., the current rate of production is approximately 60 million tons per year and less than 2 percent is reused at present. Many researchers have shown that BPG can be effectively used as building and road construction materials. Scores of projects including city streets, state roads and parking lots have utilized BPG as a base material. However, such projects have revealed different degrees of success. Expansive cracking began to appear on some of these job sites. Others seem to perform as good as, if not better, than conventional built roads. One reason for this behavior has been the attempt to use current specifications and construction practices in the utilization of by-product gypsum. In some cases, such ASTM, AASHTO or State Highway Department standards may not be applicable to BPG systems. In addition, different researchers used varying methods of laboratory preparation and testing of by-product gypsum making it difficult to compare data from that taken at different laboratories. This research project provides a set of recommended specifications and guidelines for designing, qualifying and building of stabilized-gypsum road bases and subbases. Such specifications will consolidate our state of the art, both in the laboratory as well as in the field, in to a document which can be used by researchers and agencies for effective utilization of by-product gypsum. Laboratory results indicate that cement stabilized-gypsum mixtures should perform as good as other conventional base materials. However, further improvement in the utilization of this potential by-product material in the field needs to be addressed. This includes better quality control on the moisture level in by-product gypsum in the field and more effective use of the available construction equipment. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Civil engineering." |
| Physical Description: | xvi, 227 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |