A Concept for Rapid Repair of Bomb-damaged Runways Using Regulated-set Cement PDF Download

Author: George C. Hoff
Publisher:
ISBN:
Category : Bombs
Languages : en
Pages : 168

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Author: George C. Hoff
Publisher:
ISBN:
Category : Bombs
Languages : en
Pages : 164

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Book Description
A concept of a system using regulated-set cement for the rapid repair of bomb-damaged runways is presented. Bomb craters formed by the explosion of 750-lb. 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 is 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 taht the equipment possessed sufficient flexibility to repair everything from potholes to full-size craters. All regulated-set cement repairs are permanent and do not have to be upgraded or removed and replaced. Implementation of the regulated-set cement repair concept reduces manpower requirements approximately 25% from present repair procedures. The level of manpower skills required is similar to those presently used.

Author: P. S. Bussone
Publisher:
ISBN:
Category : Cement
Languages : en
Pages : 35

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Three cements have been studied for possible use in the rapid repair of bomb-managed runways. These are: (a) lumnite (L), a high-alumina cement which was blended with portland cements type I, II, and III, regulated-set cement, and other concrete admixtures; (b) regulated-set cement (R), a halogenated calcium aluminate cement which was blended with gypsum additives in varying amounts from 0 to 12.5 percent and also mixed with an accelerator, sodium metasilicate (SMS); and (c) ordinary portland cement with various accelerators, Sigunit (S), sodium metasilicate (SMS), and sodium carbonate. Compressive strength of 2-in. cubes were determined at ages varying from 45 min to 28 days to establish strength development information. With some cements, neat slurry grout-type mixtures were made and tested in the same manner as the mortar mixtures. Water-cement ratios varied from 0.50 to 0.70 for the mortar mixtures and flow, when measured, was determined by the flow table method. With the neat slurry mixtures w/c ratios varied from 0.30 to 0.80, the efflux time being measured by the flow-cone method. The results indicate the following: (a) that many of the accelerators and so-called fast-setting cements do not develop 1-hour strengths sufficient for use in rapid repair of bomb-damaged runways; (b) two materials studied have yielded 1-hour compressive strengths in excess of 1000 psi. One is a cement, regulated-set, a proprietary product of the Portland Cement Association, and the second is an accelerator, known as sodium metasilicate, which has shown promise in both mixtures of ordinary portland and regulated-set cements.

Author: Tony C. Liu
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 426

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1056

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Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 664

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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 2834

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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1466

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Author: Sandor Popovics
Publisher: William Andrew
ISBN: 0815513089
Category : Architecture
Languages : en
Pages : 675

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Book Description
This book presents an in-depth approach to concrete ingredients and their relationships to concrete by discussing their properties, pertinent test methods, specifications, proper use and selection, and solutions to problems in practice. The approach is practice oriented, and the book assists in the improved application of concrete through a thorough understanding of its ingredients. This is aided by the discussion of certain fundamental aspects and relationships in quantitative forms, and by also presenting the interpretation of research and experience. An extensive bibliography is included. The book is a current, organized summary of knowledge concerning concrete-making materials, which will enable the engineer/user to make the best possible product using these materials.

Author: United States. Congress. House. Committee on Science and Technology. Subcommittee on Energy Development and Applications
Publisher:
ISBN:
Category : Particle accelerators
Languages : en
Pages : 1572

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