Title: Early-Age Creep of Mass Concrete: Effects of Chemical and Mineral Admixtures

Author(s): Sergio Botassi dos Santos, Luiz Carlos Pinto da Silva Filho, and Joao Luiz Calmon

Publication: Materials Journal

Volume: 109

Issue: 5

Appears on pages(s): 537-544

Keywords: chemical admixtures; creep; early ages; mass concrete; mineral admixtures.

DOI: 10.14359/51684085

Date: 9/1/2012

Abstract:
Some advances in concrete chemical and mineral admixtures are well-known, especially those related to rheology in the fresh state, improvements in the binder-matrix microstructure, and mechanical behavior. When it comes to the effects on creep, however, there are still several issues that are not well understood, especially during the early ages at loading. To help fill this gap, an experimental program was developed considering a laboratory test to monitor creep under controlled environmental conditions, altering the composition of the reference concrete with the inclusion of separate admixtures of calcined clay, metakaolin and blast-furnace slag, and lignosulfonate- and naphthalene-based chemical admixtures, keeping binder paste content unchanged to make it possible to evaluate the real effect on basic creep. The obtained results show a significant change in creep during the early ages at loading with the inclusion of the afore-cited materials, especially at the age at loading of 1 day.