Bio-Based Superplasticizers for Cement-Based Materials

Conference paper

Abstract

The additives to regulate the fresh and solid properties of mortar and concrete are of enormous importance to the building materials industry. The superplasticizers with a proportion of 85% of all admixtures are the most frequently used type of additives. With a share of 60%, the polycarboxylate ethers dominate the market for building chemical additives. Starch, which can be modified by appropriate chemical modification in such a way that fluidizing properties are produced, represents an alternative basic material. For this purpose, it is necessary first to reduce the molecular weight of the natural polysaccharide and then to introduce anionic charges into the degraded starch molecules. The influence on the rheological properties of Portland cement pastes was determined by means of rotational viscosimeters and compared with commercially available superplasticizers. To determine the interaction mechanism with Portland cement, adsorption experiments and calorimetric studies were carried out. At the same concentration, the synthesized starch superplasticizers show comparable flow characteristics to the PCE superplasticizers. The interaction mechanism is based on adsorption at the first hydration products of the cement. A low degree of polymerization and a high amount of anionic charges showed the most intensive liquefaction effect.

References

  1. 1.
    Global Cement Report 12th Edition, International Cement review. https://www.cemnet.com/Publications/Item/176633/the-global-cement-report-12th-edition.html.
  2. 2.
    Plank, J. Concrete admixtures – Where are we now and what can we expect in the future.19. Ibausil Proceedings, Weimar, 16.09.2015–18.09.2015, 32–41.Google Scholar
  3. 3.
    Crépy, L., Petit, J.-Y., Wirquin, E., Martin, P., & Joly, N. (2014). Synthesis and evaluation of starch based polymers as potential dispersants in cement pastes and self leveling compounds. Cement and Concrete Composites, 45, 29–38.CrossRefGoogle Scholar
  4. 4.
    Vieira, M. C., Klemm, D., Einfeldt, L., & Albrecht, G. (2005). Dispersing agents for cement based on modified polysaccharides. Cement and Concrete Research, 35, 883–890.CrossRefGoogle Scholar
  5. 5.
    Pourchez, J., Ruot, B., Debayle, J., Pourchez, E., & Grosseau, P. (2010). Some aspects of cellulose ethers influence on water transport and porous structure of cement-based materials. Cement and Concrete Research, 40, 242–252.CrossRefGoogle Scholar
  6. 6.
    Peschard, A., Govin, A., Pourchez, J., Bertrand, L., Maximilien, S., & Guilhot, B. (2006). Effects of polysaccharides on the hydration of cement suspension. Journal of the European Ceramic Society, 26, 1439–1445.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Faculty of Civil Engineering, F. A. Finger-Institute for Building Material Engineering, Chair of Building Chemistry and Polymer MaterialsBauhaus-Universität WeimarWeimarGermany

Personalised recommendations