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|Title:||A concept for rapid repair of bomb-damaged runways using regulated-set cement|
|Authors:||Air Force Weapons Laboratory.|
United States. Army. Office of the Chief of Engineers.
Hoff, G. C. (George C.)
|Publisher:||Concrete Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-75-2.|
Abstract: A concept of a system using regulated-set cement for the rapid repair of bomb-damaged runways is presented herein. Bomb craters formed by the explosion of 750-pound bombs beneath the pavement are repaired by concurrently filling the lower regions of the crater with the ejecta from the crater and a regulated-set cement cellular concrete. As filler nears the top of the crater, the ejecta is omitted and a stronger cellular concrete is placed as the subbase material. A regulated-set cement mortar l S placed as the wearing surface. This repair can be applied to make runways operational 4 hours from the start of the repair. The concept was evaluated by repairing a number of smaller craters using the equipment and procedures developed for the repair concept. The equipment consists of portable, continuous batching and pumping equipment. The evaluations indicated that the equipment possessed sufficient flexibility to repair everything from potholes to full- size craters. The regulated-set cement repair materials could be pumped several hundred feet with this equipment. The repaired surface was level with surrounding pavement surfaces. All regulated-set cement repairs are permanent and do not have to be upgraded or removed and replaced. When used as a subbase material, regulated- set cement cellular concrete can be proportioned to exceed the normal rigid-pavement bearing strength requirements. The early-age flexural strengths of regulated-set cement sanded mortars are adequate for use in rigid pavements. Implementation of the regulated-set cement repair concept reduces manpower requirements approximately 25 percent from that required in present repair procedures. The level of manpower skills required is similar to those presently used. Existing rapid-repair equipment kits would have to be modified for this concept but no new equipment development would be needed. Full-scale crater repairs are recommended for further evaluation of the concept. A sample specification for the continuous batching-pumping equipment is contained in Appendix A.
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