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Root > Materials Chemistry > Materials Science > Admixtures for Concrete / Mortar > Shrinkage-reducing Additives
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*Materials Science: Expansion Cements, Shrinkage-compensating Concrete  (2)

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On the mechanisms of shrinkage reducing admixtures in self con-solidating mortars and concretes
Compared to conventional concrete, SCC have an increased paste volume, and therefore show a higher shrinkage than conventional concrete. Shrinkage reducing admixtures (SRA) are proved to have the desired effect. Better understanding the working mechanism of SRAs was a main objective of this research. The effects on cement hydration, drying and shrinkage were investigated.
Hrsg.: Arnd Bernd Eberhardt, 2010, Dissertation. Bauhaus-Universität Weimar, Fakultät Bauingenieurwesen

Mitigation Strategies for Autogenous Shrinkage Cracking
The fundamental parameters contributing to the autogenous shrinkage and resultant early-age cracking of concrete are presented. Mitigation strategies which are discussed include: the addition of shrinkage-reducing admixtures more commonly used to control drying shrinkage, control of the cement particle size distribution, modification of the mineralogical composition of the cement, the addition of saturated lightweight fine aggregates, the use of controlled permeability formwork, and the addition of superabsorbent polymers ("water-entrained" concrete) .
Hrsg.: Bentz, D. P.; Jensen, O. M., in: Cement and Concrete Research, Vol. 26, No. 6, 677-685, August 2004

Mitigating Autogeneous Shrinkage by Internal Curing
Two different sources of internal water supply are compared: 1) replacement of a portion of the sand by saturated low-density fine aggregate and 2) the addition of superabsorbent polymer particles (SAP).
Hrsg.: Geiker, M. R.; Bentz, D. P.; Jensen, O. M.

Mixture Proportioning for Internal Curing
The full text is, aside the linked abstract, available as PDF (7 pages, 1.5 B).
Hrsg.: Bentz, D. P.; Lura, P.; Roberts, J. W. in: Concrete International, Vol. 27, No. 2, 35-40, February 2005

Shrinkage-Reducing Admixtures and Early Age Desiccation in Cement Pastes and Mortars
Informations about the effects of a shrinkage-reducing additive (SRA) on cement pastes and mortars. Report on fundamental studies of the early-age desiccation of cement-based materials with and without a SRA ('Eclipse SRA' from Grace). Besides an abstract the fulltext is available as PDF (12 pages, 1,9 MB). [Product Informations for 'Eclipse': http://www.na.graceconstruction.com/concrete/download/EC-1_3.pdf]
Hrsg.: D.P. Bentz et al, Nachdruck aus: Cement and Concrete Research, Vol. 31, No. 7, 1075-1085, July 2001

Autogenous Deformation and Internal Curing of Concrete
Details on the mechanism of autogenous shrinkage. Measurements were made in cement pastes, normal weight concrete, and lightweight concrete. The effect of internal curing by addition of water-absorbing lightweight aggregates was tested. Full text is available (208 pages, 6.5 MB, PDF).
Hrsg.: Pietro Lura, Dissertation, 2003

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