Apparent Activation Energy of Concrete in Early Age Determined by Adiabatic Test

• 作 者: 王甲春 阎培渝
• 机 构: Department of Civil Engineering Nanjing University of Aeronautics and Astronautics,Department of Civ
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2004年期
• 关键词: apparent Portland cracking hydration silica maturity substitution cured modulus

The apparent activation energy of concrete in early age was determined by adiabatic temperature rise test with different initial temperatures.The influence of mineral admixtures such as fly ash, slag and silica fume on the apparent activation energy of concrete was investigated.The equivalent age that expresses the maturity of concrete was calculated to evaluate the cracking risk of concrete in structures.The results reveal that a substitution of 20%fly ash for Portland cement obviously decreases the apparent activation energy of concrete,however,a substitution of 10%silica fume for Portland cement increases the apparent activation.Finite element method analysis of a simulating concrete wall shows that the concrete containing 20% fly ash has the lowest cracking risk.

The apparent activation energy of concrete in early age was determined by adiabatic temperature rise test with different initial temperatures. The influence of mineral admixtures such as fly ash, slag and silica fume on the apparent activation energy of concrete was investigated. The equivalent age that expresses the maturity of concrete was calculated to evaluate the cracking risk of concrete in structures.The results reveal that a substitution of 20% fly ash for Portland cement substantially reduces the apparent activation energy of concrete, however, a substitution of 10% silica fume for Portland cement increases the apparent activation. Finite element method analysis of a simulating concrete wall shows that the concrete containing 20% ​​fly ash has the lowest cracking risk.