Application of Cold Weather Concreting with Accelerator for Freeze Protection to Full Scale Structures Kim, Young-Jin; Baek, Tae-Ryong; Lee, Sang-Soo; Won, Chul; Kim, Dong-Seok;
In this study, the results of applying cold weather concreting mixed with Accelerator for Freeze Protection(AFP) to full scale structures are presented. Since the determination of W/C and amount of AFP significantly have an effect on strength gain and protection of frost damage in early, a full investigation is needed to determine these values at stage of nux design. The flowability of fresh cold weather concreting with AFP was similar to the same W/C. Lower loss of workability and initial slump flow of concrete using superplasticizer of polycarboxylic ester than that of melamine sulphonate showed that polycarboxylic ester was more effective on elapsed time. Temperature histories of specimens located in insulation boxes at the site was similar to that of structures. Thus, it is cleared that simple adiabatic curing method is effective for evaluating in-place concrete strength than specimens cured by sealing method. The investigation results of development of compressive strength of cold weather concreting included AFP with curing methods by logistic curves indicated that AFP can be effective to gain strength at lower temperature than normal curing temperature. In field testing, vinyl sheets were placed over the concrete sections and AFP enabled concrete to gain to protect frost damage in early ages and specified compressive strength of concrete at 28 days under average temperature of (lowest temperature was ) during site application.
cold weather concreting;accelerator for freeze protection;intial frost damage;curing condition;
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