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Suppliers of Raw Materials: Aggregate for Concrete and Mortars  (1)


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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

Workability
Investigation on workability of SCC: Effects of aggregate size, additives and admixtures. [56 pages, 478 kB, PDF]
Publisher: Örjan Petersson, Swedish Cement and Concrete Research Institute, 1999
Cat: Application Technology: Self-compacting Concrete

Discussions about concrete, asphalt, and aggregates
Registration required (free of charge).
Publisher: Aggregate Research Industries
Cat: Discussion Groups

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

Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction
Determination of the influence of the addition of silica fume as a cement replacement on the stresses generated by the specimen. Besides an abstract the fulltext is available as PDF (7 pages, 3.0 MB).
Publisher: Ferraris et al, in: Cement, Concrete, and Aggregates, Vol. 22, No. 1, 73-78, June 2000
Cat: Materials Science: Alkali-Silica Reaction in Concrete

Influence of Silica Fume on the Stresses Generated by Alkali-Silica Reaction.
Determination of the influence of the addition of silica fume as a cement replacement on the stresses generated by the specimen. Besides an abstract the fulltext is available as PDF (7 pages, 3.0 MB).
Publisher: Ferraris et al, in: Cement, Concrete, and Aggregates, Vol. 22, No. 1, 73-78, June 2000
Cat: Materials Science: Pozzolana (Fly Ash, Microsilica, Tuff, Volcanic Ashes) and latent hydraulic materials (blast furnace slag)

Admixture and method for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-containing aggregates
In the preparation of aqueous cement compositions containing a plasticizer, such as an EO/PO polymer-containing plasticizer, or EO/PO comb polymer-containing plasticizer, and further containing clay, such as a smectite clay, which expands when in contact with water, the step of providing an agent operative to modify the clay whereby the plasticizer absorbing capability of the clay is reduced. In exemplary methods of the invention, the plasticizer is an EO/PO (e.g., oxyalkylene) plasticizer and preferably an EO/PO comb polymer, and the clay-activity-modifying agent may comprise an inorganic cation, an organic cation, a polar organic molecule capable of being absorbed by the clay, a clay dispersant (such as a polyphosphate), or a mixture thereof.
Publisher: Leslie A. Jardine et al, W.R. Grace & Co., 2002, US6352952
Cat: Patents: Plasticizer, Superplasticizer

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

Lightweight gypsum plaster (1984) (German)
Plaster based on gypsum and aggregates such as limestone, sawdust, light aggregates in the form of perlite, vermiculite or the like and hemihydrate, as well as small amounts of derivatives of cellulose and of starch, the customary amounts of retarding agents and a water/gypsum factor within the range of 0.60 to 0.78.
Publisher: Andrea Glatthor
Cat: Guide Formulations: Mineral Plasters


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hard aggregate
hard aggregate screed
hard aggregates
heavy aggregate concrete
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