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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]
Publisher: D.P. Bentz et al, Nachdruck aus: Cement and Concrete Research, Vol. 31, No. 7, 1075-1085, July 2001
Cat: Materials Science: Shrinkage-reducing Additives

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).
Publisher: Geiker, M. R.; Bentz, D. P.; Jensen, O. M.
Cat: Materials Science: Shrinkage-reducing Additives

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

Influence of Cement Particle-size Distribution on Early Age Autogenous Strains and Stresses in Cement-Based Materials
Cement powders of four different finenesses have been investigated. Measurements include chemical shrinkage, degree of hydration, internal relative humidity development, autogenous deformation and eigenstress development. From: Journal of the American Ceramic Society, January 2001. Besides an abstract, fulltext is available as PDF (8 pages, 3.6 MB).
Publisher: Bentz et al, Building and Fire Research Laboratory, National Institute of Standards and Technology
Cat: Materials Science: Cements

High strength concrete
Report on investigations into the effects of setting and hardening on the properties of high strength concretes, and in particular on the behaviour with restrained deformation at a young age. The shrinkage (in particular the autogenous shrinkage) as well as the release of heat of hydration and the associated strength development were investigated. [12 pages, 597 kB, PDF]
Publisher: Maria Teresa Alonso
Cat: Materials Science: Concrete

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).
Publisher: Pietro Lura, Dissertation, 2003
Cat: Materials Science: Shrinkage-reducing Additives

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) .
Publisher: Bentz, D. P.; Jensen, O. M., in: Cement and Concrete Research, Vol. 26, No. 6, 677-685, August 2004
Cat: Materials Science: Shrinkage-reducing Additives


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