GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

flyash

I4get2P | Posted in Green Products and Materials on

Thin shell concrete structures and ferrocement have been an interest of mine for years. I used flyash in all my recipes. 

Do you use any Portland cement?  What ratios of flyash, Portland and aggregate.? What grit aggregate?

What ratio would you suggest, specifically for a floating raft foundation?

What formulation of flyash do you suggest? I have used type F, even though it is a special order item. 

Thanks in advance.

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. Tim R | | #1

    Here is a good modern reference -- Making Better Concrete: Guidelines to Using Fly Ash for Higher-Quality, Eco-Friendly Structures by Bruce King
    You need to work with you ready mix supplier to see what the offer.

    1. I4get2P | | #2

      Thanks Tim.
      Due to my remote location, I will have to order dry mix and add water on site. That will enable me to add some basalt fiber and if needed the flyash as well. I did visit the supplier years ago and they seem flexible.
      I appreciate the reference.

  2. Expert Member
    Malcolm Taylor | | #3

    You are aiming for a 32 MPA mix for a slab on grade foundation. Your supplier should be able to give the proportions of fly-ash, etc. you can add to achieve that. Designing concrete mixes isn't really a DIY activity.

  3. Nick Defabrizio | | #4

    As I have stated in other posts, I love concrete as a material but think we need to use less of it for residential building due to climate concerns. One way to do that is to use thin shell in place of thicker pours where alternatives to concrete are not feasible. I am curious, how thin have you gone with slabs/floors that need to support furniture and people and how was it done?

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |