The Bleeding Of Potland Cement Paste, Mortar, and Concrete

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Title: The Bleeding Of Potland Cement Paste, Mortar, and Concrete

Author(s): T. C. Powers

Publication: Journal Proceedings

Volume: 35

Issue: 6

Appears on pages(s): 465-480

Keywords: none

Date: 6/1/1939

Abstract:
Bleeding is identified as the result of subsidence of temporarily suspended solids. It occurs in two stages: a period of constant rate followed by one of diminishing rate. The rate during the constant period follows a general law derived from Poisseuilie’s law of capillary flow. The water content of the mix and the - surface area of the solids are the major controlling factors, but with these constant, different materials show Individuality, due to unidentified characteristics. A simple law governing bleeding capacity (subsidence per unit original height) is developed. The ideal mix from the standpoint of bleeding is defined.