Effect of Atmospheric Conditions During the Bleeding Period and Time of Finishing on the Scale Resistance of Concrete

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Title: Effect of Atmospheric Conditions During the Bleeding Period and Time of Finishing on the Scale Resistance of Concrete

Author(s): Paul Klieger

Publication: Journal Proceedings

Volume: 52

Issue: 11

Appears on pages(s): 309-326

Keywords: no keywords

Date: 11/1/1955

Abstract:
Labratory tests reported were intended to reveal whether or not changes in bleeding, brought about by variations in atmospheric conditions or by vary-ing the time of merhanical manipulation, influenced the resistance of concrete to surface scaling. Specimens of both non-air-entrained and air-entrained concretes were subjected, during the bleeding period, to variations in wind velocity and temperature and given final finishes at different times during bleeding. After preliminary curing, the specimens were subjected to the scaling test. Test results indicate that, the scale resistanrc of air-entrained concretes was not influenced by surface exposure, temperature, or time of final finishing, despite changes in bleeding similar to those for non-air-entrained concretes. No scaling developed on any of the air-entrained concretes up to 250 test. Reth the rate and amount of bleeding and resistance to surface scaling trf the noll-nir-c,ntr:~irled roncretes increased with an incre:uq~ in the velocity of air ever the surface. There nas no consistrnt change in rate and amount of tkcding or resistance to scaling with change of trmprrature (50 to 90 F). 1‘1 WY’ appt~~~ to he a trend toward an increase in resistance with incrcasc ill tcm~wr:ltnre. xon-air-entrained concrete surfares struck off immediately after casting, b\ittr 1x1 further manipulations during or after the hleeding period slr~wt~l !W’:ttN’ resistance to surfacr scaling than those given a second and t&t; nnish, Snw immediate finishing is presently impractical from the standpoint of etJt:lining a pavement surface of proper riding quality, it appears drsiral,lc to th’h~ final finish as long as possible.