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原文传递 Field Studies to Address the Use of Compost to Mitigate Shoulder Cracking.

题名：	Field Studies to Address the Use of Compost to Mitigate Shoulder Cracking.
作者：	puppala, a. j. intharasombat, n.
关键词：	pavements, literature review, chemical tests, biosolids, physical tests, laboratory tests, field tests, effectiveness, environmental assessment
摘要：	Compost materials have proven to be beneficial in mitigating shrinkage cracking at a Stephenville, Texas, site. However, the results are only valid for one soil type and related environmental conditions. In order to extend and verify the effectiveness of compost amendments in multiple soil types and climatic regions, an implementation study was conducted at three distinct test sites located in Lubbock, Bryan, and Corpus Christi regions, representing Panhandle Plains, Prairies & Lakes, and Gulf Coast regions of the state, respectively. Two locally available composts were considered for soil amendments at each site. A total of three test plots were constructed; one with no compost cover that served as a control plot and two with select compost amendments as covers. A compost amendment ratio of 20% by dry weight of soil was utilized in the previous research project. Both quantitative and qualitative data was collected from embedded moisture and temperature sensors, digital image surface cracking studies, surficial erosion surveys, and visual observations of paved shoulder cracking and vegetation growth. This data was analyzed with statistical comparison t-test, which indicated that both Dairy Manure and Biosolids compost amendments at Stephenville were yielding effective performance. Analysis of data from the new sites showed that both Biosolids Compost and Cotton Burr Compost amendments provided soil property improvements. Other compost plots, in particular those used in Bryan, did not provide satisfactory results due to lack of vegetation at the site, which resulted in high erosion and desiccation cracking. Composts that provided satisfactory performance were recommended for top soil treatments to control cracking on pavements. A few other recommendations include immediate seeding after CMT construction and use of a field compaction density equivalent to a lesser value of either 80-85% of standard Proctor maximum dry density or a bulk dry density of 87 pcf. These recommendations are made to enhance vegetation growth in order to control erosion and crack formation in subsoils and adjacent pavements. / NOTE: Technical rept. (Sept. 2004-Aug. 2005). / Supplementary Notes: 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；37p
报告类型：	科技报告