Author: V. R. Ryabov
Publisher: Taylor & Francis
View: 7870First published in 2004. Routledge is an imprint of Taylor & Francis, an informa company.
Author: Sidney G. Tucker,Timothy W. Vollor
Category: Membranes (Technology)
View: 8011Tests were conducted to determine the performance of the T17 membrane (a 2-ply, neoprene-coated, nylon material) as an expedient surfacing for roadways. A test section 29 ft wide and 94 ft long was constructed on a 7 percent grade. A construction joint was placed in the membrane surfacing approximately 50 ft from the top of the test section. Three trucks and trailers (M151 truck with M100 trailer, M37 truck with M101 trailer, and M35 truck with M101 trailer) were used to apply the desired amount and types of traffic. A total of 1000 passes per lane was conducted on the test section without a resulting failure of the membrane surfacing. Vehicle operations on the dry membrane surface caused no noticeable wear of the surfacing. When the membrane was slippery and vehicle operators had to exercise caution, no vehicular control problems occurred as long as speed was controlled according to the condition of the surfacing. During wet conditions, slight wear of the membrane occurred because of slag particles under the spinning vehicle wheels and sliding of vehicle wheels during emergency stops. Although it was not used during these tests, a nonskid compound that is now supplied normally with the membrane surfacing should be used to permit emergency braking action and control of vehicles during wet weather. During the investigation, the T17 membrane performed well and is considered a satisfactory expedient surfacing for dustproofing and waterproofing two-way military roads. It is recommended that vehicles be stopped and started gradually on the surfacing to prolong its life. (Author).
Author: Sidney G. Tucker
Category: Anchorage (Structural engineering)
Author: Society of Automotive Engineers
Category: Government publications
Author: Sidney G. Tucker
View: 634Laboratory tests were performed at the U.S. Army Engineer Waterways Experiment Station to determine the feasibility of using a lightweight, electronically welded, vinyl-nylon (T15) membrane as a surfacing for helipads. Electronic welding together of strips of membrane permitted fabrication of the entire surfacing for a helipad in one piece at the factory, thus greatly reducing construction time over that required to join membrane strips with adhesive in the field. Engineer field tests of the T15 membrane surfacing were conducted at Cairns Army Airfield, Ft. Rucker, Ala., during the period 6 September 1963-2 June 1964 to determine the operational suitability of the membrane when exposed to traffic of U.S. Army wheel- and skid-geared helicopters over a long period, and the rate at which it could be placed. During the tests, 3309 helicopter operations were performed on the T15 membrane-surfaced helipad. It was concluded from the field tests that: (1) wheel-geared helicopters will not damage the surfacing, but skid-geared helicopters will puncture and cut the suracing; (2) the waterproofing and dustproofing qualities of the surfacing can be maintained by repairing the membrane with patches and adhesives; (3) the surfacing can be placed rapidly by inexperienced personnel; and (4) a membrane surfacing should be developed that will be satisfactory under operations of skid-geared helicopters.