| Title |
Estimation of Compressive Strength of Concrete Incorporating Fly Ash Subjected to High Temperature by Equivalent Age Method |
| Keywords |
High Temperature ; Strength Development ; Fly Ash ; Carino Model ; Equivalent Age |
| Abstract |
In this paper, estimation of compressive strength of concrete incorporating fly ash subjected to high temperature was investigated. Ordinary Portland cement and fly ash cement(30% of fly ash) were used, respectively. Water to binder ratios ranging from 30% to 60% and curing temperatures ranging from 20℃∼65℃ were also adopted for experimental parameters. According to results, at high temperature, FAC had higher strength development at early age than OPC concrete and it kept its high strength development at later age due to accelerated pozzolanic reaction subjected to high temperature. For strength estimation, Carino model based on equivalent age were applied to verify the availability of estimation model. It shows that fair agreements between calculated values and measured values were obtained evaluating compressive strength with Carino curve. The application of Carino model at high temperature had remarkable deviations at later equivalent age. For this reason, introduction of correlation parameter into Carino model considering the influence of age factor was done in this paper. Corrected estimation model showed good agreements between calculated values and measured ones regardless of type of cement and W/B. However, correction factors in terms of equivalent age should be considered to enhance the accuracy of long term strength estimation of concrete at high curing temperature. |