Flyash as an alternative to Portland

Everything right from the place we live to the , the road we take, the bridge we cross, the highways we speed and the skyscrapers we scale all have high intensive carbon spewing material i.e. cement. The fact that 5% of the globe’s carbon emission is caused by the cement world does not paint a rosy picture with the environmentalists.  The cement industries high emission rates are mainly attributed to portland cement which by and large the most commonly used cement, is incredably energy intensive and can emit up to 1 ton of co2 for every 1 ton produced.
With the Government regulations and restrictions in place companies are pushed to innovate new ways and techniques to reduce the emission rates of carbon. Many companies have considered the use of flyash (emits only .2 ton) in place of Portland cement needed in concrete (a concept using volcanic ash which was derived by the Romans as early as 10th century BC), flyash a byproduct of coal offers environmental advantages by diverting the material from the industry wastes, reduces the processing time and subdues pollution. In addition it also improves the performance and quality of concrete and demands less water.
To learn more please visit flyash
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Posted in ecological footprint, pollution
2 comments on “Flyash as an alternative to Portland
  1. When looking at page 8 of the first pdf, I see that the production process is more complicated and thus, the concrete must be more expensive. Given its beneficialty and ecological compliance on the one hand, and the price disadvantage on the other, the key question appears to be: How to incentivise the purchase of FlyAsh concrete? A tax incentivisation is probably the most capable answer, but would be especially in smaller countries a distortion if large countries do not care about the concrete they predominantly use. An enhanced international commitment could be reached through supranational governance as I suggested in my first blog post.

  2. hdutrisac says:

    As shown on page 7 of the referenced PDF, the strength of concrete using fly ash is initially lower than regular portland cement concrete and higher beyond 28 days. In Canada, the 28 day compressive strength of concrete is used for design purposes. As such, one must be careful in using a fly ash admixture where early strength concrete is desired , e.g. for form stripping. In such cases, a higher strength concrete may be required to achieve the desired early strength. On the other hand, concrete with fly ash achieves greater strength over time which results, in general, in more durable concrete. The Canadian War Museum concrete building structure, in Ottawa, Canada, was constructed using a fly ash admixture. A link to this sustainable building is included in the post entitled “What is Green Building?”.

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