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PORE SIZE DISTRIBUTION IN CRITICAL POINT AND FREEZE DRIED AGGREGATES FROM CLAY SUBSOILS
Author(s) -
LAWRENCE G. P.,
PAYNE D.,
GREENLAND D. J.
Publication year - 1979
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1979.tb01004.x
Subject(s) - shrinkage , porosimetry , mineralogy , soil water , materials science , water content , porosity , chemistry , composite material , porous medium , soil science , geology , geotechnical engineering
Summary Using aggregates from 2 clay soils over a range of water contents from pF 1 to oven dry, shrinkage and water release curves were measured and pore size distributions found by mercury porosimetry after critical point and after freeze drying. Freeze drying caused less shrinkage, the maximum being 6 cm 3 100 g −1 from pF 1, but gave a large increase, up to 10 cm 3 100 g −1 , of pores in the 0.1–10 μm size range. Critical point drying produced more shrinkage from pF 1, more than half of which was attributed to loss of interlamellar water and the rest to the collapse of pores larger than 10 μm. In these clays the volume of pores of over 3 μm diameter was very small (<3 cm 3 100 g −1 ) and most of the plant available water was released by collapse of narrower pores and not by pore emptying.