Long term durability properties of class F fly ash geopolymer concrete
By D. Law, A. Adam, Tom Molyneaux, I. Patnaikuni, A. Wardhono. 2015
269 citations recorded by the source corpus.
The environmental impact from the production of cement has prompted research into the development of concretes using 100 % replacement materials activated by alkali solutions. This paper reports the assessment of a number of key durability parameters for geopolymer concrete made from fly ash activated with sodium silicate and sodium hydroxide. Properties investigated have included workability, compressive strength, water sorptivity, carbonation, chloride diffusion and rapid chloride permeability. Microstructure studies have been conducted using scanning electron microscopy and energy dispersive X-ray spectroscopy. The results showed that both the geopolymer concretes with activator modulus 1.00 and 1.25 gave durability parameters comparable to Ordinary Portland and blended cement concretes of similar strength, while the geopolymer concrete with an activator modulus of 0.75 displayed lower durability performance. However, there is a concern over the long term performance of the geopolymer concretes with activator modulus of 1.00 and 1.25 when considering chloride induced corrosion of reinforcing steel due to the initial pH and long term chloride diffusion coefficient.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/c69f337a8a6751fc99da2a68d09c0433cba5a8fd
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In Civil and Structural Engineering
In Materials Chemistry
- S. Barbhuiya
- P. Deb
- P. Sarker
- Rayed Alyousef
- Hisham Alabduljabbar
- W. K. Part
- Mohamed El-Zeadani
- M. Ramli
Citations in the corpus
- Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica (2016, background): “[34], an increase in 230 SiO2 increases the density of the matrix.”
- An overview on the influence of various factors on the properties of geopolymer concrete derived from industrial by-products (2015, background): “[38] suggested optimum Ms for class F FA based geopolymer concrete is 1.”
- Zeta potential, gel formation and compressive strength of low calcium fly ash geopolymers (2015, background): “Activation of the fly ash has been hypothesised as being due to a number of factors, both the Activator Modulus (AM) and the Na2O dosage have been identified as having a significant impact upon the strength [11,18,23,24].”