EFFECTS OF CURING TEMPERATURE ON THE COMPLETE STRESS-STRAIN PLOTS FOR HIGH STRENGTH CONCRETE. FRACTURE OF CONCRETE AND ROCK: RECENT DEVELOPMENTS. PAPERS PRESENTED AT THE INTERNATIONAL CONFERENCE, UNIVERSITY OF WALES, COLLEGE OF CARDIFF, SCHOOL OF ENGINEERING, SEPTEMBER 20-22, 1989
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Complete stress-strain plots were obtained for high strength concrete containing silica fume by testing 53.4 mm x 106.8 mm cylinders in parallel with two or more instrumented steel tubes. Three curing temperatures of 2, 22, and 38 deg C were investigated. Tests were conducted at the ages of 1, 3, 7 and 28 days. The following conclusions were drawn: (1) It is possible to obtain the complete stress-strain plot by the technique chosen; (2) Low temperature curing results in lower strengths at early ages; however, the differences diminish at later ages; and (3) Concrete brittleness increases with age. Finally, an attempt has been made to quantify the post peak behaviour by Ductility Indices.(A) For the covering abstract of the conference see IRRD 829348.