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原文传递 Effects of Using Compost as a Preventive Measure to Mitigate Shoulder Cracking: Laboratory Studies.

题名：	Effects of Using Compost as a Preventive Measure to Mitigate Shoulder Cracking: Laboratory Studies.
作者：	puppala, a. j. banavathu, n. intharasombat, n. qasim, s.
关键词：	pavements, literature review, chemical tests, biosolids, physical tests, laboratory tests, field tests, effectiveness, environmental assessment
摘要：	Composting is a successful method of recycling organic waste material such as yard trimmings, municipal biosolids, and animal manure into stabilized materials that could be used for bioremediation, erosion control, landscaping, and roadside vegetation. The process of composting organic wastes is expanding rapidly in the United States since landfill spaces for disposal of organic wastes are becoming scarce and expensive. If not recycled, certain composts such as Dairy Manure would potentially contaminate streams and rivers through migration. Hence, it is essential to seek new application areas for composts. Compost materials, given their moisture affinity (hydrophilic), fibrous and low permeability characteristics, could provide stabilization of natural expansive subgrades by mitigating shrinkage cracking and covering subsoil surfaces. In order to verify this stabilization, a research study is being conducted. This study has two phases, laboratory and field to evaluate the effectiveness of compost treatments to soils. This research report summarizes the first phase results, which include geotechnical characteristics of Dairy Manure and Biosolids composts and compost manufactured topsoils (CMTs). A local expansive soil from Stephenville, Texas, was used as the control soil. Laboratory test results indicate that linear shrinkage strains are reduced and strength and swell strains are increased with compost amendments. Environmental assessments of using these materials are also addressed. Construction of test plots for the second phase investigations are described. Current field monitoring of the test plots will provide better assessments of CMTs to mitigate shoulder cracking in field conditions. / NOTE: Technical rept. (Sept. 2002-Aug. 2003). / Supplementary Notes: See also PB2005-109959 and PB2007-101019. Prepared in cooperation with Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0709；138p
报告类型：	科技报告