Relationship between Drying Shrinkage Strain of Concrete and Quality of Coarse Aggregate
By H. Yamada, H. Katahira and H. Watanabe
Concrete Journal, Vol.58, No.3, Mar. 2020
- Synopsis
- Drying shrinkage of concrete is influenced by various factors such as the materials used, mix proportions, construction conditions, environmental conditions, and shape. In recent years, much attention has been paid to the fact that concrete using coarse aggregate that conforms to the JIS standard experiences excessive drying shrinkage strain. It has been reported that the effect of the coarse aggregate used is greater than the effect of unit water content, which has long been held to be a major factor for drying shrinkage of concrete. Based on the above, a method for measuring the drying shrinkage rate of coarse aggregate using a wire strain gauge has been established and the relationship between the drying shrinkage rate of concrete and various quality indicators of coarse aggregate has been clarified through an investigation focusing on the drying shrinkage characteristics of coarse aggregate. This paper reports the results of reorganizing the data acquired so far.
- Keywords:
- Drying shrinkage, Coarse aggregate, Wire strain gauge, Water absorption, Clastic rock
