Effects of early misting on concrete shrinkage

Title: Effects of early misting on concrete shrinkage
Author(s): Juan Lozoya, Craig M. Newtson
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 6
Language: English

Abstract: An experimental testing system was developed to measure the small displacements that occur during early-age shrinkage of concrete. The system was used to evaluate the shrinkage characteristics of concrete subjected to misting at early ages. The objectives of this work were to determine the effects of the amount of mist provided, the time at which the mist was initiated, and the effects of wet curing. Misted specimens were provided with mists equal to 0, 50, 100, and 150% of the evaporation rate. Early-age shrinkage decreased as the amount of mist was increased. Specimens that were wet cured at four hours developed strains substantially lower than dry specimens, and specimens that were misted 30 minutes after water was introduced to the mixture showed even less shrinkage strain. Specimens subjected to mist at 30, 90, 150, and 210 minutes after the addition of water to the mixer showed that providing mist at an earlier time also reduces shrinkage. Prisms cured with the shrinkage specimens were tested for modulus of rupture. These tests demonstrated that neither the amount of mist nor the time of misting significantly influenced the tensile strength of the concrete.

Online publication: 2004-03-25
Classification: Pore Structure and Curing
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.009