Porosity, Pore Size Distribution, Micro-structure

Mike Lawrence*, Yunhong Jiang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

60 Citations (Scopus)

Abstract

The high porosity and microstructure of bio-aggregates are fundamental to their physical properties. Typically they have a low density and a complex pore structure. This has two principal effects. In the first instance, low density is associated with low strength, but also with low thermal conductivity. For this reason most bio-aggregates are not suitable for use as structural materials, but are eminently suited to act as a low density filler in composite materials conferring low thermal conductivity on the resulting bio-composite. The complex nature of their porosity results in a material that is able to readily adsorb moisture and humidity. This results in a material that has an exceptionally high moisture buffering capacity, a characteristic that is of great interest in building materials, because it tends to stabilise the internal environment of a building, thereby resulting in a much more healthy indoor environment. This chapter considers the range of methods that can be used to measure porosity and to characterise the microstructure of materials in general, and discusses how some of these techniques have been used on bio-aggregates. It also identifies opportunities to use novel techniques on bio-aggregates in order to improve our understanding of their porosity, pore size distribution, pore connectivity and microstructure, all of which are characteristics that are essential to the optimisation of the performance of bio-aggregates within the construction industry.

Original languageEnglish
Title of host publicationBio-aggregates Based Building Materials
Subtitle of host publicationState-of-the-Art Report of the RILEM Technical Committee 236-BBM
EditorsSofiane Amziane, Florence Collet
PublisherSpringer
Chapter2
Pages39-71
Number of pages33
ISBN (Electronic)9789402410310
ISBN (Print)9789402410303
DOIs
Publication statusE-pub ahead of print - 5 Feb 2017
Externally publishedYes

Publication series

NameRILEM State-of-the-Art Reports
Volume23
ISSN (Print)2213-204X
ISSN (Electronic)2213-2031

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