A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand

Thesis (M.Eng.) - Asian Institute of Technology, 1976

The influence of four different aggregate types on tensile creep of concrete was investigated. All specimens were loaded to 40% of the ultimate tensile strength of the respective concrete, determined 28 days after casting. In Series I, tensile creep and swelling was measured up to 90 days at 95 ± 5% R. H and 72 ± 3°F. Series II specimens were kept in an air conditioned room at 78 ±5% R.H and 72 ±6°F for 42 days. Tensile specific creep (creep per p.s.i) was nearly the same in the case of Series I concretes irrespective of the type of aggregate used. However, in Series II, the specific creep was found to be highest for sandstone concrete and lowest for limestone concrete; concretes made with Andesite and Gravel having intermediate values. The results indicate that tensile creep does not seem to be influenced with aggregate type at higher relative humilities whereas it is inversely proportional to modulus of elasticity of the aggregates in drying conditions .