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Prehydrated high-alumina cement-based admixture for compensating autogenous shrinkage in high-performance concrete
One of the limitations of high-performance concrete is its susceptibility to autogenous 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 autogenous 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 autogeneous 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 autogeneous shrinkage in high-performance concrete has not been prevented by the use of this admixture.
Prehydrated high-alumina cement-based admixture for compensating autogenous shrinkage in high-performance concrete
One of the limitations of high-performance concrete is its susceptibility to autogenous 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 autogenous 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 autogeneous 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 autogeneous shrinkage in high-performance concrete has not been prevented by the use of this admixture.
Prehydrated high-alumina cement-based admixture for compensating autogenous shrinkage in high-performance concrete
Feuchter aluminium-reicher Zuschlag auf Zementbasis zum Ausgleich der natürlichen Schwindung in Hochleistungsbeton
Repette, W.L. (author) / Mailvaganam, N.P. (author)
1999
19 Seiten, 9 Bilder, 3 Tabellen, 20 Quellen
Conference paper
English
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