ABSTRACT
In this paper, the influences of five types of fly ash widely used in the Guizhou Region on the performance of polycarboxylate superplasticizer and concrete were explored. The water demand ratio, fineness, activity index, loss on ignition (LOI), particle size analysis and morphological analysis performance indicators of the five types of fly ash were tested. Next, the impacts of different fly ash and polycarboxylate superplasticizers on the slump, slump flow, setting time, gas content, bleeding ratio and compressive strength of concrete were compared. The study results revealed that the fly ash with small fineness and small LOI showed good adaptability to the polycarboxylate superplasticizer. The gas content was lower in the concrete mixed with the higher-LOI fly ash, and none of the five types of fly ash exerted obvious effects on the setting time and bleeding ratio of concrete. The concrete mixed with the Andian fly ash had the highest strength, while that mixed with Qianxi fly ash had the lowest strength.
