Thc tension softeni19 diagram provides valuab 且 e inforlnations to discuss the ・ fra (; tUre behavioT of concrete . ln this paper , the numcrical analysis method to calculate the poly −・ 1ilear tens . ion sefteing Cliagram is investigated . Thc prediction method for the Ioad − disp 且 acement relationship ミ of concrcte . with cracks is developed by using the fictitious crack modeL conbept with the K − supe 【 position inethod and the constitutive law by the poly − linear tension sofiening dlagram . In this m6thod , 皿 onlinear crack equations are solved by the iteration plogram of evaluating the softening inclinations . Poly . 一 ! inear appToximation mcthod for galculatiI1 琴 the sof し ening diagram from the actual load − displqcerpent culvc is proposed based on the . crack equation anatysis method . 1[ he softening diagrams of concTetes 蛸 tb various aggregates and matrix strengths are measured and their characte τistics are ' discusse ' d. Kcy,,ηnlS : 脚 ∫ε 0 π 3 (-舜επ' π g 伽 8厂am , poly − ' ∫ ηeσ7 卿 ro曜脚 ∫ 10 馬 CノαC舵 卯 α∫ 1 ρπ,
This paper reports on the investigation into the influence of age and cure on fracture properties of concrete subjected to the effect of high temperature heating up to 800°C. Wedge splitting tests were conducted to measure the load versus crack mouth opening displacement curves. The initial cohesive stress and fracture energy were estimated by the inverse analysis of tension softening diagram calculated by the load versus crack mouth opening displacement curves. As a result, the effect of age and cure on the fracture properties of concrete subjected to high temperature heating was discussed.
The in 刊uence of concrete curing time Qn the fracture parameters of plain concrete and short cut fiber rein 長) rced concrete was investigated . Three − point bending tests on pre ・ notched concrete bearn specimens were performed . Fracture parameters of specimen were analyzed based on the poly − linear approximation ana 互 ysis of tension seftening diagram with the data of a load − ioad point displacement curve . It was fbund that the critical load− point dispiacement got small with the increase of curing time and of concrete strengIh , the fracture energy efnormal strength concrete was alrnest same as that ofhigh strength concrete , and the fracture energy of the short cut fiber reinf ( )rced concrete became greater with the increase ofcuring time and ofconcrete strength . Tension softening diagram of short cut fiber reinfbrced concrete were approximaIed by tri − 1inear , using effective tensiie strength , effective fracIure energy and sぼess
This paper reports on the investigation into the fracture properties of concrete subjected to the effect of high temperature heating up to 800°C. Wedge splitting tests were conducted to measure the load versus crack mouth opening displacement curves. The initial cohesive stress and fracture energy were estimated by the inverse analysis of tension softening diagram calculated by the load versus crack mouth opening displacement curves. As a result, the effect of high temperature heating on the fracture properties was discussed.
Water permeability tests and SEM analysis were conducted for self-healing of cracking in heavyweight concrete used as containments for radioactive substances to preventing leaching of radioactive contaminants. Within the range of this study, water permeability is reduced by self-healing at an early stage, but the internal crack width scarcely changed, with crack closure being limited to the surfaces. Also, the addition of an expansive additive led to early self-healing, presumably due to its chemical prestress effect. In contrast, the inclusion of fly ash and organic fibers appears to produce its effect slowly and progressively over a long time.
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