Title of article :
Crack effects on gas and water permeability of concretes
Author/Authors :
Vincent Picandet، نويسنده , , Abdelhafid Khelidj، نويسنده , , Hervé Bellegou، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Abstract :
The relationship between load-induced cracking and concrete permeability is studied. Ordinary concrete (OC) and high-performance concrete (HPC), including steel fiber-reinforced concrete (HPFRC), are used. Two discs, 50 mm-thick slices, cut from 110–220 mm cylindrical specimens are diametrically loaded, as for a normal splitting test. The lateral displacement, also called the crack opening displacement (COD) is monitored for each loading cycle. After unloading, gas and finally water permeability tests are both performed, using constant head permeameter, to compare the influence of the percolating fluid and the COD. Due to the wide range of measured gas flow, Klinkenbergʹs and Dupuit-Forcheimerʹs laws are applied to compute the intrinsic gas permeability. Results suggest it increases proportionally to the cube of the COD and it matches water permeability, if only the first water percolating time is considered. The roughness parameter of the cracks induced in each concrete, is compared and discussed.
Keywords :
Permeability , durability , High-performance concrete , Fiber reinforcement , Microcracking
Journal title :
CEMENT AND CONCRETE RESEARCH
Journal title :
CEMENT AND CONCRETE RESEARCH