Laboratory-produced high-volume fly ash blended cements - Compressive strength and resistance to the chloride-ion penetration of concrete

This paper presents data on the performance of the concrete made with high- volume fly ash (HVFA) blended cements using fly ashes from Canada and the U SA. The parameters investigated included the compressive strength of concre te and its resistance to the chloride-ion penetration. Regardless of the ty pe of the fly ash used, the concrete made with the HVFA blended cements dev eloped higher compressive strength at all ages than that of the HVFA concre te in which unground fly ashes and laboratory - produced portland cements h ad been added separately at the concrete mixer. The increase in the compres sive strength was more significant for the HVFA blended cements produced wi th the cement without a superplasticizer (SP) and made with coarse fly ash. The use of the HVFA blended cements improved the resistance of the concret e to the chloride - ion penetration, and the improvement in the resistance increased with an increase in the intergrinding time of the fly ash and the cement. (C) 2000 Elsevier Science Ltd. All rights reserved.