Title: Early Age Strength Properties of High Performance Concrete Under Accelerated Curing

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Publication: CIA

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Date: 2/13/2011

Abstract:
Cementitious systems used in precast elements that undergo an accelerated curing regime usually have tight specifications with regards to early age compressive strength requirements. Super T beams cast for the Melbourne Eastlink Freeway called for 40MPa transfer strength at 14 hours and adherence to VicRoads Section 610 (1) on structural concrete cured under radiant heating. Concrete test cylinders cast for the purpose of determining transfer strengths were required to be placed in heating boxes that were connected to the hot water heating system. They were found not to be good representations of insitu concrete compressive strengths. Early age strengths of the beam elements were successfully predicted using the maturity method and the temperature matched curing system. Trials were also conducted using different ways of administering high range water reducers (superplasticisers) to improve concrete performance.