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Time‐resolved phenomena in cements, clays and porous rocks
Author(s) -
Allen A. J.
Publication year - 1991
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889890012237
Subject(s) - porosity , materials science , characterization (materials science) , small angle neutron scattering , neutron scattering , mineralogy , microstructure , cement , porous medium , transmission electron microscopy , fractal , scattering , composite material , geology , nanotechnology , optics , mathematical analysis , physics , mathematics
Small‐angle neutron scattering (SANS) provides a powerful tool in the non‐destructive characterization of statistically representative microstructures in technologically important disordered materials. While qualitative microstructural models must be provided by other methods such as transmission electron microscopy (TEM), SANS quantifies the microstructural parameters and can characterize scale‐invariant (fractal) disordered materials such as cements, clays and porous rocks. H 2 O/D 2 O contrast‐variation methods have proved particularly useful for investigating the accessibility of different parts of the pore structure and in differentiating between pore‐volume access (measured by other methods) and pore‐surface accessibility (likely to control sorption and leaching processes). This paper describes SANS studies of disordered porous materials, particularly the hydration of cement and the real‐time permeation of water in clay minerals. Other microstructural effects are also considered.