Superplasticized Shrinkage-Compensating Concrete

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Title: Superplasticized Shrinkage-Compensating Concrete

Author(s): M. Collepardi, M. Corradi, and M. Valente

Publication: Special Publication

Volume: 68

Issue:

Appears on pages(s): 159-172

Keywords: coarse aggreg ates shrinkage; expand ing age nts; plasticizers; portland cemen strength; water-cement ratio ; compressive strength; drying expansion; naphthalene compounds; ts; shrinkage-compensating concretes;

Date: 1/1/1981

Abstract:
Compressive strength and restrained expansion tests were carried out on concretes containing naphthalene sulphonic formaldehyde type superplasticizer and an expansive agent based on processed lime. At constant expansive agent content, the higher the early strength (1 day) the higher was the restrained expansion. Therefore, if the superplasticizer is used to increase the early strength by reducing the water/cement ratio, it is possible to reduce the content of the expansive agent to obtain the same de-gree of expansion. On the other hand, if the superplasticizer is used to reduce both water and cement, and therefore the drying shrinkage, less expansive agent would be required for shrinkage compensation purposes. The results of the present work indicate that the combination of a superplasticizer and an expansive agent may be more advantageous than the use of expansive agent alone.