Abstract
Two kinds of slaking tests, ordinary accelerated slaking tests and newly-developed 1d compression-slaking tests, are conducted on three kinds of mudstone in order to investigate slaking phenomena, namely, weathering due to cyclic process of wetting and drying. Variation in grading occurred by slaking and resulting, irreversible changes in mechanical characteristics are discussed based on the results of accelerated slaking tests. The experimental results of one-dimensional compression slaking test show that: particle crushing during compression process causes increase in compressibility; the wetting and drying cycles causes slaking-induced change of grading and this change causes significant volumetric compression. Finally, it is mentioned that constitutive modeling considering slaking is possible by describing evolution of grading due to slaking through the grading index IG and linking maximum and minimum void ratio or critical state void ratio with IG.
