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Effect of matrix permeability on durability of structural grade geopolymer and conventional concretes



Author(s): K. Sagoe-Crentsil, S. Yan, T. Brown
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 60 – 61
Total Pages: 2
Language: English


Abstract: 
The factors that control concrete permeability, fluid transport and long-term durability of fly-ash Geopolymer (GP) systems were investigated using equivalent grade Ordinary Portland Cement (OPC) concrete as reference. To assess durability performance, high pressure water and gas permeability tests were conducted for steam-cured Geopolymer and OPC concretes with nominal strengths of 40 MPa and 70 MPa. Measured mean gas (k) and water (Kw) permeability coefficient values for the lower grade concrete were respectively 6.19E-17 m2 at 300 kPa gas pressure and 1.52E-10 m/s at 525 kPa water pressure. It was observed that water permeability coefficient data for Geopolymer concrete was typically an order of magnitude higher, although gas permeability values were found to be equivalent to reference OPC systems. Analyses of experimental data suggest that transport properties of Geopolymer matrices are largely controlled by the evolution and distribution of its inherent mesoporous capillary pore network structure. The Paper further examines implications of increased GP matrix permeability on key durability parameters such as chloride diffusion, carbonation rate, steel reinforcement corrosion and long-term engineering performance.


Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00