Study of the Behavior of Concrete with shrinkage Reducing Admixtures Subjected to Long-Term Drying

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Title: Study of the Behavior of Concrete with shrinkage Reducing Admixtures Subjected to Long-Term Drying

Author(s): R. Gettu, J. Roncero, and M. A. Martin

Publication: Special Publication

Volume: 206

Issue:

Appears on pages(s): 157-166

Keywords: chemical admixtures, concrete, deformations, drying, shrinkage

Date: 4/1/2002

Abstract:
Shrinkage is a critical characteristic of concrete that can lead to undesired cracking, thereby limiting the serviceability of concretre structures. The ability to design concretes with significantly lower shrinkage is, therefore, of great practical importance. Along these lines, new shrinkage reducing chemical admixtures have been developed in order to reduce the extent of shrinkage strains. The present work analyses the effectiveness of the incorporation of three such admixtures using long-term drying shrinkage tests. The results indicate a remarkable reduction of the shrinnkage for two admixtures based on polypropylene glycol formulations while no significanty improvement was obtrained in the case of a wax-based admixture. Additionally, the influence of these shrinkage dreducing admixtures on other basic properties of the concrete, such as workability and 28-day compressive strength, has been quantified. A plasticizing effect, which can be exploited for reducinf the superplasticizer dosage or the water/cement ratio, was observed in the case of the two glycol/based admixtures. A slight decrease of the compressive strength was measured in all the cases due to the incorporation of the admixtures.