Paper Title:
Medium to Long Term Engineering Properties and Performance of High-Strength Geopolymers for Structural Applications
  Abstract

The medium to long term engineering performance of high-strength geopolymer concrete systems are largely dependent on fluid ingress and the transport phenomena that govern permeability of structural members exposed to aggressive environments. For the purpose of analysing durability performance, both high pressure water and gas permeability testing of fly-ash geopolymer(GP) concretes have been assessed for samples cured under ambient and steam exposure conditions at 65OC. The observed mean permeability coefficient values for gas(k) and water(Kw) of steam-cured structural grade concrete was respectively 6.19E-17m2 at 300kPa gas pressure and 1.52E-10m/s at 525kPa water pressure. While mean gas permeability values were comparable to reference steam-cured ordinary Portland cement(OPC) systems, the corresponding water permeability coefficient data for geopolymer concrete was ten-fold higher. The transport properties of OPC concrete systems are typically governed by water-to-cement ratio and the degree of hydration which is linked to the level of porosity and pore interconnectivity. However, corresponding permeability of geopolymer concrete appears to be dictated by an inherent mesoporous capillary pore network structure for which transport properties appear to be partly dependent on mode of concrete curing. The Paper examines global implications of increased permeability and key durability parameters such as chloride diffusion, carbonation rates and steel reinforcement corrosion on long-term engineering and durability performance.

  Info
Periodical
Edited by
Pietro VINCENZINI and Cristina LEONELLI
Pages
135-142
DOI
10.4028/www.scientific.net/AST.69.135
Citation
K. Sagoe–Crentsil, T. Brown, S. Q. Yan, "Medium to Long Term Engineering Properties and Performance of High-Strength Geopolymers for Structural Applications", Advances in Science and Technology, Vol. 69, pp. 135-142, 2010
Online since
October 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Qing Yu Cao, Wei Sun, Li Ping Guo
Abstract:Cracking is the most common damage in the secondary lining concrete because of its continuous thin-walled structure, potential surrounding...
793
Authors: Shi Ping Zhang, Lan Zong, Jia Ping Liu
Abstract:A detailed observation on the penetration profile of chloride ions through a crack in concrete structures was carried out. Cracks were...
113
Authors: Jian Hua Wu, Yun Lan Liu
Abstract:This paper studies the influence of different mineral admixtures(fly ash and ground granulated blast furnace slag)on the carbonation...
366
Authors: Mengcheng Chen, Kai Wang, Quanshui Wu, Zhen Qin
Chapter 4: Reliability and Durability of Structures
Abstract:According to the service environment of light rail transit and subway structures, in this paper experiments on the corrosion characteristics...
1987
Authors: Balázs Nagy, Dóra Szagri
Chapter 4: Hygrothermal Performance of Buildings
Abstract:This paper defines the hygrothermal material properties (thermal conductivity, density, specific heat capacity, vapor diffusion coefficient...
579