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Effect of limestone filler BET(H2O)-area on the fresh and hardened properties of self-compacting concrete

Oskar Esping (Institutionen för bygg- och miljöteknik, Byggnadsteknologi)
Cement and Concrete Research (00088846). Vol. 38 (2008), 7, p. 938-944.
[Artikel, refereegranskad vetenskaplig]

This paper presents a study on the use of limestone fillers with different specific surface area and their effect on the fresh and hardened properties of self-compacting concrete (SCC). The surface area was determined by a simplified BET method using water vapour as adsorbate. A rheometer and a slump flow test were used to measure the flowability of fresh concrete. A concrete dilatometer was used to measure the autogenous shrinkage, and a ring-test for the plastic cracking tendency. The compressive strength was determined at 28 days. It was found that the measure of BET(H2O)-area can be used to evaluate the water requirement for constant workability of the SCC, where a change in BET(H2O)-area of 1000 m2/kg corresponds to approximately 0.8% in moisture content. The results showed that filler with a large area will result in an increased autogenous shrinkage, decreased evaporation, lower plastic cracking tendency, and a higher compressive strength. With additional water the results was the opposite. © 2008 Elsevier Ltd. All rights reserved.



Denna post skapades 2009-10-01.
CPL Pubid: 99369

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Byggnadsteknologi

Ämnesområden

Samhällsbyggnadsteknik

Chalmers infrastruktur