ABSTRACT
ABSTRACT: In order to investigate the influence of temperature of low heat Portland cement on the performance of concrete mixed with polycaboxylate superplasticizer, this paper selected two kinds of polycaboxylate superplasticizers, and explored the effect of cement temperature changes on the mixes properties and early age mechanical properties of concrete mixed with polycaboxylate superplasticizer. The results showed that 1) temperature of low heat Portland cement has greater impact on the workability of concrete, when the cement temperature was higher than 60◦C, the concrete occurred slight bleeding phenomenon; 2) the setting times of concrete and cement temperature were following inverse relationship; 3) the slump loss rate and air content loss rate of concrete was proportional to cement temperature, the higher cement temperature, and the greater loss rate with time; 4) the early ages compressive strength of concrete were increasing with the changing of cement temperature, the same age’s compressive strength was greatly impacted by the changing of cement temperature; 5) since the quality performance of polycaboxylate superplasticizers were different, the sensitivity of two kinds of superplasticizers to cement temperature changes were different too.
