INVESTIGATIONS INTO THE FACTORS INFLUENCING LONG-RANGE MATRIX DIFFUSION RATES AND PORE-SPACE ACCESSIBILITY AT DEPTH IN GRANITE

被引:28
作者
BRADBURY, MH
GREEN, A
机构
[1] AERE Harwell, Engl, AERE Harwell, Engl
关键词
COLLOIDS - FLOW OF WATER - Porous Materials - MOISTURE - Diffusion - PRESSURE EFFECTS;
D O I
10.1016/0022-1694(86)90147-2
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Investigations in granite systems have been conducted on (1) diffusion through fissure surfaces, (2) the effect of confining pressures on diffusion rates, (3) the extent of pore interconnectivity over metre-distances, and (4) the accessibility of the pore space to colloidal particles in the size range 0. 3-0. 09 mu m. Diffusion rates through fissure surfaces were found to be greater than or equal to those measured on samples taken well away from such surfaces. No evidence for pore blocking by alteration products was found. Confining pressures of up to 16MPa reduced diffusion rates. Pore connectivity over distances of up to 125 cm on granite cores saturated with 3M NaCl was demonstrated. Colloidal particles in the size range investigated neither entered the pore structure nor blocked pore apertures to any significant extent. Additional study results are discussed.
引用
收藏
页码:123 / 139
页数:17
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