INFLUENCE OF QUALITY OF COARSE AGGREGATE ON DRYING SHRINKAGE OF CONCRETE

• Published in: Cement Science and Concrete Technology Vol. 65; no. 1; pp. 261 - 267
• Main Authors: INOUE, Masumi, YAMASAKI, Shintaro, IGARI, Heizaburo, OKADA, Kaneyoshi
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Cement Association 25.02.2012
• Subjects: Coarse aggregate; Drying shrinkage; Modulus of elasticity; Pore volume; SEM image; Water absorption
• ISSN: 0916-3182; 2187-3313
• DOI: 10.14250/cement.65.261

The purpose of this study is to clarify the influence of quality of coarse aggregate on drying shrinkage of concrete. The drying shrinkage test of concrete by using seven kinds of coarse aggregate having different qualities were examined. As a result, the drying shrinkage changed with the kind of coarse aggregate, and the correlatively between the drying shrinkage of concrete and aggregate itself was very high. As a whole, the drying shrinkage of concrete tends to increase as the water absorption and the total pore volume of coarse aggregate increased. However, the drying shrinkage of concrete by using sand gravel increased although the water absorption and the total pore volume of sand gravel was relatively small. Furthermore, the relationship between micro-pore structure and shrinkage of aggregate was examined by using SEM observation of the mirror polished surface of aggregate.