Fly Ash Additive to Brick mix

Submitted by pregusay on Mon, 09/09/2019 - 11:56

Do you have any experience using the residue coming from coal fired electric plants?
We have an abundance of that here in our area which are being thrown away.
And one of the big power plants has allowed us to take it for FREE.

Would that be a suitable material to use in making the interlocking bricks?

If so, what would be a good ratio to start with?

Stabilising/binding agents in CEBs; Portland cement and possible alternatives?

Submitted by Dan on Fri, 22/06/2018 - 18:59

Hi Geoffrey,

Just after some more general information regarding CEBs, especially the ratio of cement needed as an admixture and the potential of other less CO2 intensive materials like RHA to be partial or full replacements as stabilising/binding agents?

Kind regards,

Non-stabilized compressed earth blocks

Submitted by on Fri, 21/07/2017 - 16:41

Hello dear Geoffrey
Before I began to make stabilized ICEBs, I wanted to check if the soil-sand mix was good for compression and had the right proportions of each component. So I pressed a few samples that appeared to be fine.

My question is, do they need to be somehow cured or treated in any special way to become useful for interior walls or other not heavy load applications?

Reviving a Block maker

Submitted by jak on Wed, 22/07/2015 - 19:38

Greetings from sunny Kenya!
have acquired two derelict block making machines (which were used for CEB a while back) These machines have been unused for over a decade and are rather stiff. am looking for assistance as to how to service these machines and how to get the 'ram' section to raise as it would when 'dispensing' the block
Any advice would be greatly appreciated!

Proper mix for making good CEB

Submitted by bambam on Wed, 19/02/2014 - 19:36

Thank you, Geoffrey for answering my many questions. I appreciate you sharing your knowledge and experience.
I've read that the ideal soil mix for solid CEBs is:
15% gravel (2-20 mm)
50% sand (0.06-2 mm)
15% silt
20% clay
What are your thoughts on this ideal mix?
Our soil here is very sand with measurable amounts of silt and clay  in various places (up to 20% clay and silt combined).