Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Sequentially molding in situ different portions or layers on...
Patent
1978-01-05
1980-05-27
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Forming structural installations in situ
Sequentially molding in situ different portions or layers on...
52223R, 264 35, 264228, 264 38, B28B 2304, B28B 2160
Patent
active
042050294
ABSTRACT:
The invention relates to a method of forming a pre-stressed concrete member in which at least a bonding surface of a pre-cast concrete shell has the hydration process therein temporarily arrested by means of heat applied thereto such that reactivation of the hydration process after the stressing of the shell and prior to the pouring into the shell of infilling concrete, results in a strong bond being formed between the bonding surface of the pre-cast concrete element and the infilling concrete. The construction joints between the infilling concrete and the pre-cast concrete shell are thus of an improved integrity.
REFERENCES:
patent: 978617 (1910-12-01), Mitats
patent: 2702424 (1955-02-01), Bakker
Tensile Bond Strength Between Aggregate & Cement Paste or Mortar, T. T. C. Hsu, ACI Journal, Apr. 1963, pp. 465-486.
Strength & Deformation Properties of Autogenously Healed Motars, R. K. Dhir., ACI Journal, Mar. 1973, pp. 231-236.
The Chemistry of Cement & Concrete, F.M. Lea, Edward Arnold (Publishers) Ltd., 3rd Ed., pp. 239-269, 1970.
Cement & Concrete, H. J. Gilkey, pp. 7-20-7-23.
Autogenous Healing of Concrete in Compression, E. F. Whitlam, The Structural Engineer, pp. 235-243.
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