Geopolymer and Portland cement concretes in simulated fire

By R. Zhao, J. Sanjayan. 2011

235 citations recorded by the source corpus.

High-strength Portland cement concrete has a high risk of spalling in fire. Geopolymer, an environmentally friendly alternative to Portland cement, is purported to possess superior fire-resistant properties. However, the spalling behaviour of geopolymer concrete in fire is unreported. In this paper, geopolymer and Portland cement concretes of strengths from 40 to 100 MPa were exposed to rapid temperature rises, simulating fire exposures. Two simulated fire tests, namely rapid surface temperature rise exposure test and standard curve fire test, were conducted. In both types of test, no spalling was found in geopolymer concretes, whereas the companion Portland cement concrete exhibited spalling. This can be attributed to different pore structures of the two concretes. The sorptivity test found that geopolymer concrete had a significantly higher sorption, therefore more connected pores, than Portland cement concrete when compared at the same strength level. Hence, it is suggested that the water vapour can es...

Subfields: Civil and Structural Engineering, General Materials Science

View Paper: https://www.semanticscholar.org/paper/394fd7b836dbb94f97e3372af6e278f11131e631

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Civil and Structural Engineering

1. Mingzhong Zhang
2. Navid Ranjbar
3. P. Sarker
4. Faiz Shaikh
5. Yining Ding
6. Z. Abdollahnejad
7. A. Camões
8. Z. Yao

In General Materials Science

1. Yining Ding
2. P. Sarker

Citations in the corpus

• Effect of fire exposure on cracking, spalling and residual strength of fly ash geopolymer concrete (2014, background): “A similar colour change to brown in fly ash geopolymers subjected to high temperature heat was also observed by Zhao and Sanjayan [30].”
• Effect of elevated temperature on alkali-activated geopolymeric binders compared to portland cement-based binders (2016, background): “Furthermore, Zhao and Sanjayan [14] studied a fly ash based geopolymer and compared the material's response to a portland cement in a simulated gas fire, where the portland cement spalled while the fly ash did not spall.”
• Durability of alkali-activated binders: A clear advantage over Portland cement or an unproven issue? (2012, background): “Zhao and Sanjayan [58] compared the performance of OPC concrete and alkali activated concrete under the standard curve fire test mentioning that only the former exhibit spalling behaviour.”
• Compressive strength of fly‐ash‐based geopolymer concrete at elevated temperatures (2015, background): “Most of the published research reported the residual strength of geopolymer concrete measured at ambient condition after exposure to elevated temperatures up to 800 °C [12–14].”
• Fiber-reinforced geopolymer composites: A review (2020, background): “Furthermore, geopolymer concrete shows much higher thermal resistance compared to OPC concrete [210, 211].”