1. ERDC Knowledge Core
2. Pre - Engineer Research and Development Center (ERDC)
3. Soils and Pavements Laboratory - (8/1/1972 - 4/16/1978)
4. Technical Publication
5. Miscellaneous Paper

Title:	Materials investigated for dust-control program (Southeast Asia)
Authors:	United States. Army Materiel Command. White, D. W. (Dewey W.) Decell, J. Lewis.
Keywords:	Dust control Expedient surfacings Helicopter downwash Military operations Southeast Asia Helicopters
Publisher:	U.S. Army Engineer Waterways Experiment Station. Engineer Research and Development Center (U.S.)
Series/Report no.:	Miscellaneous Paper (U.S. Army Engineer Waterways Experiment Station) ; S-69-1
Description:	Miscellaneous Paper Abstract: This report describes an investigation conducted to evaluate the use of some asphalt and latex emulsions, mulches, erosion-control blankets, lightweight membranes, and filter blankets as means of controlling dust in the Southeast Asia theater of operations. These materials were subjected to helicopter downwash blast, fire, rain, waterproof, and random vehicle traffic tests. The helicopter downwash blast tests were conducted on the materials placed on loose, dry sand, clayey silt, and heavy clay contained in test carts. Each test cart held one soil, and each material was placed on all three soils. Materials that required a cure time were allowed to cure at the prevailing atmospheric conditions for 4 hr before testing. Each material was subjected to simulated helicopter disk loadings of 6.0, 7.5, 9.0, and 10.5 lb/sq ft until failure or until the material had been subjected to each disk loading for 1 min. The fire tests consisted of pouring 8 oz of JP-4 jet fuel on a material or combination of materials, igniting the fuel, and observing whether the material continued to burn after the fuel had been consumed. The rain test was conducted on the materials after they had been subjected to the downwash blast test. The material or combination of materials was exposed to simulated rainfall at the rate of 1 in./hr for 1 hr to determine the effects of rain on the material. The material was then resubjected to the downwash blast test. The waterproof tests consisted of placing each type of soil in 3- by 3-ft containers (one soil in one container) and placing each material or combination of materials on each soil. The materials were placed in the same manner for these tests as they were in the downwash tests. A known amount of water was placed on the material, the time required for the water to pass through was determined, and the amount that passed through was measured. For the traffic tests, the materials or combination of materials that passed the helicopter downwash blast tests were placed on a 10- by 60-ft test section with four test items, each consisting of a 10- by 15-ft section. These items contained loose sand, loose clayey silt, compacted clayey silt, and compacted heavy clay (one soil per item). Materials that required a cure time were allowed to cure at prevailing atmospheric conditions for 24 hr before testing. Traffic with 1/4-, 3/4-, and 2-1/2-ton military vehicles was conducted as follows: (A.) One pass with each vehicle was made in the longitudinal direction of the test section. (B.) One pass with each vehicle was made on each item in the transverse direction of the test section. (C.) Ten passes of channelized longitudinal traffic with the 3/4-ton vehicle were applied if the material or combination of materials withstood the traffic described in subparagraphs (A.) and (B.) Two lightweight membranes, Griffolyn 105 and three-ply Herculite, were the only materials that successfully passed all the tests. NOTE: This file is large. Allow your browser several minutes to download the file.
Gov't Doc #:	Miscellaneous Paper S-69-1
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/20981
Appears in Collections:	Miscellaneous Paper