Influence of Short Cut Fiber Mixing and Curing Time on the Fracture Parameters of Concrete

Abstract

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

Determination of the tension softening curve of nuclear graphites using the incremental displacement collocation method

“…The bilinear [33], tri-linear [34] and exponential [35] curves are widely used to approximate the TSCs of quasi-brittle materials. To facilitate future simulations of graphite fracture using commercial finite element packages, the TSCs identified in the current study were simplified to the idealised curves using regression analysis.…”