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

武汉理工大学学报-材料科学版(英文版), 2007, 22(3): 537-541.

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1.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;Department of Civil Engineering, Tsinghua University, Beijing 100084, China

2.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

3.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

基金项目: the Jiangshu Province Post Doctoral Fund(2006) 国家高技术研究发展计划(863计划)(2003AA33X100) the National Post Doctoral Fund(20060400284) 江苏省自然科学基金(BK2005216)

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

Keywords： mineral admixtures

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.

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

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