Abstract
The purpose of this paper is to study the 28‐day strength of concrete which suffers shaking, such as an earthquake, during its strength developing period. Focusing on moderate strength concrete, 34.31 MPa (5000 psi), groups of concrete cylinders were made and tested on a shaking table. The PGA level of the earthquake and the cylinder age are the two main variables considered in this study. Some testing results can be given as follows: If the concrete's age is older than three days, the earthquake shaking will not reduce the 28‐day strength significantly. For an age less than two days, shaking will reduce its strength. However, the tendency is not monotonic. The 28‐day strength can increase for concrete aged between initial setting and 12 hours old, and concrete exposed to intense earthquake (say 0.33g).
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