| Title |
Evaluation of the Compressive Strength of the Concrete Incorporating the Cement Kiln Dust based on Maturity |
| Keywords |
Cement Kiln Dust ; Equivalent Age ; Maturity ; Curing Temperature |
| Abstract |
This paper is to investigate the effect of the curing temperature on strength development of concrete incorporating cement kiln dust(CKD) quantitatively. Contents of CKD, curing temperature ranging from 5℃～35℃ and water to binder ratio from 40% to 50% were chosen for test parameters. Estimation of the compressive strength of the concrete was conducted using the equivalent age equation and the rate constant model proposed by Carino. Correction of Carino model was studied to secure the accuracy of strength development estimation by introducing correction factors regarding rate constant and age. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of CKD resulted in a decrease in compressive strength both at early and later age slightly, regardless of curing temperature. It is thought that CKD does not play a role in enhancing compressive strength by pozzolanic reaction and its effect on strength development is limited to filler effect. Based on the strength development estimation using modified Carino model, good agreements between measured strength and calculated strength are obtained with 28 days of equivalent age. |