Superplasticizers

Superplasticizers

Chemical additives for concrete that increase the fluidity of the mix without excess water.
References in periodicals archive ?
Molecular structure and dispersion--adsorption mechanisms of comb--type superplasticizers used in Japan, Journal of Advanced Concrete Technology 1(1): 16-25.
Part II deals with mix design and the rheological behavior of concrete, with four chapters on particle packing, superplasticizers, viscosity-enhancing admixtures, and fiber reinforcement.
Such high compressive strength may be achieved by the following measures: elimination of coarse aggregate makes the mixture more homogeneous [6]; higher content of fine aggregates improves the granular composition of the mixture [7]; components of the mixture are selected with similar modulus of elasticity to achieve a more uniform compressive deformation of concrete [8]; properties of concrete matrix are improved by adding pozzolanic additives [9]; W/C ratio reduced by adding high range water reduces (superplasticizers); thermal treatment of specimens also improves the concrete's tensile stress-strain behavior and the addition of steel or polypropylene fibers reduces brittle failure fracture of the concrete [10].
Other admixtures known as superplasticizers or high-range water reducers have gained rapid acceptance in the building industry, which typically is quite conservative and very slow to adopt step change technology.
Superplasticizers, specialty accelerators, and niche products such as biocides and corrosion inhibitors will post the strongest advances, while growth for commodity products such as standard water reducers, traditional iron oxide pigments and calcium chloride will be considerably more subdued.
One of the most important advances in construction concrete involves the use of "superplasticizers" such as sulfated organic chemicals, which make the cement more fluid with less water.
Becker, "Interaction of polycarboxylate-based superplasticizers and cements: influence of polymer structure and C3A-content of cement," in Proceedings of 12th International Congress on the Chemistry of Cement (ICCC), Montreal, Canada, July 2007.
Chemical admixtures are incorporated to provide higher workability and increased performance [5], namely, superplasticizers or high range water reducers (HRWR) and viscosity modifying agents (VMA).
In fresh concrete, VTT contends, LigniOx-derived solution outperforms commercial lignosulphonate-based plasticizer and provides a promising alternative to synthetic superplasticizers. It enables use of small volumes of water in a concrete mix design, producing a highly workable paste that hardens into a strong final product.
The award was presented at the International Conference on Superplasticizers and Other Chemical Admixtures in Concrete in Ottawa, Canada.
Bjornstrom, "Influence of cement and superplasticizers type and dosage on the fluidity of cement mortars--Part I," Cement and Concrete Research, vol.