Method for placing concrete for construction of a master concret

Details Method for placing concrete for construction of a master concret Method for placing concrete for construction of a master concret

1995-06-07

1997-07-08

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Forming structural installations in situ

264 33, 264 34, 264 406, 264327, 264333, E04B 116

Patent

active

056457731

ABSTRACT:
A method for placing concrete on a rock foundation to construct a massive concrete structure, such as a dam, a bridge pier or a foundation of a building, precludes development of cracks in the concrete by thermal stress. According to the method, stress exceeding an allowable limit for crack initiation and propagation is controlled by the following steps: (a) determining a temperature influence function to enable calculation of a thermal stress distribution under a temperature change by using results of a numerical analysis; (b) identifying a portion of the structure at which a crack will develop, by using said temperature influence function and a function of thermal change in said structure; (c) partially heating/cooling the vicinity of the identified portion and redistributing the excess stress predicted to cause cracking in the structure; and (d) reducing thermal stress in the structure by transmitting excess heat generated in the structure to another portion of the structure, at a location at which crack development is not predicted. Preferably, a heat pump system is used for transferring the excess generated heat to another portion of the structure to control the excess stress.

REFERENCES:
T. Hirose et al., Dam Technology No. 28 published 1988, pp. 15-23, "Method for Designing Temperature Control in RCD Method" (with English summary).
M. Strauss, et al., Bureau of Reclamation, U.S. Department of the Interior, published 1949, "Cooling of Concrete Dams".

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