コンクリートの破壊パラメータに及ぼす短繊維混入および材齢の影響

概要

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The influence of concrete curing time on the fracture parameters of plain concrete and short cut fiber reinforced concrete was investigated. Three-point bending tests on pre-notched concrete beam specimens were performed. Fracture parameters of specimen were analyzed based on the poly-linear approximation analysis of tension softening diagram with the data of a load-load point displacement curve. It was found that the critical load-point displacement got small with the increase of curing time and of concrete strength, the fracture energy of normal strength concrete was almost same as that of high strength concrete, and the fracture energy of the short cut fiber reinforced concrete became greater with the increase of curing time and of concrete strength. Tension softening diagram of short cut fiber reinforced concrete were approximated by tri-linear, using effective tensile strength, effective fracture energy and stress at 0.5mm crack opening displacement in poly-linear tension softening diagram.
社団法人日本建築学会の論文
2000-03-30