Prehydrated High-Alumina Cement- Based Admixture For Compensating Autogenous Shrinkage in High-Performance Concrete

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Prehydrated High-Alumina Cement- Based Admixture For Compensating Autogenous Shrinkage in High-Performance Concrete

Author(s): W. L. Repette and N. P. Mailvaganam

Publication: Special Publication

Volume: 186

Issue:

Appears on pages(s): 39-58

Keywords: admixture; autogenous shrinkage; expansive admixture; high-alumina cement; high-performance concretes

Date: 5/1/1999

Abstract:
One of the limitations of high-performance concrete is its susceptibility to autogenously shrinkage, which can considerably compromise its durability and mechanical strength despite diligent cure during the hardening stage. Although calcium-sulfoaluminate admixture (CSA) and shrinkage-reducing admixture (SRA) can play a role in reducing autogenously shrinkage, rapid set and low effectiveness have been associated with their use in concrete with low water content/ Recently, an innovative type of CSA admixture based on pre-hydrated high-alumina cement (H-HAC) has been developed, but its potential in reducing autogenous shrinkage has not yet been evaluated. In this paper, the effects of H-HAC expansive admixture in decreasing the shrinkage during the early hardening and hardening stages are described. It was hoped that the expansion generated from hydration of the expansive components would offset the volume reduction due to autogenous shrinkage. The influences of particle size distribution, dosage and type of H-HAC hydrates in determining expansion are evaluated and discussed. Microstructural and chemical aspects are studied through XRD and SEM techniques. Tests on the evaluation of the H-HAC admixture to offset autogenous shrinkage are described and preliminary results are presented. The results show that in specific dosage and particle size distribution, H-HAC is a suitable admixture for compensating shrinkage, although autogenous shrinkage in high-performance concrete has not been prevented by the use of this admixture.