A Study on the Creep of Concrete regarding Compression and Tension during the Early Stage

Abstract

This paper deals with an experimental study on the creep of concrete during the early stage. In the experiments, the concrete was made using portland blast-furnace slag cement or fly ash cement or normal portland cement. Using spring-loaded creep test machines, the concrete specimens were loaded at three or seven days.
A summary of the results is shown below.
(1) The following relations on the mechanical properties of concrete were obtained; between splitting tensile strength and compressive strength, between Young's modulus in compression and compressive strength, between Young's modulus in tension and that in compression.
(2) The relations between the creep strain of concrete and the time since application of load were nearly expressed by linear lines on logarithmic graph paper.
(3) The specific creep of concretes during tension was greater than that during compression.
(4) Influence of age at the application of load on the specific creep of concrete was investigated.
(5) Both the specific creep and the creep coefficient were related to the strength of concrete.