Lightweight Concrete Garden Boxes – Pt 3.5 Perlite, Portland & CSA Cement

Test Results

Summarizing tests and results
Summarizing tests and results

It passed the weed eater test so I think, all in all, perlite concrete in these proportions makes a good lightweight alternative for these garden panels.
The panels weighed, on average, 34 percent lighter than regular concrete. And this was a bit lighter than the similar vermiculite panels from part three.

talking about the test
Good surface finish

Significant Weight Reduction

The CSA perlite panel was 45 percent lighter. Since CSA concrete is stronger than Portland I was able to use more perlite in the mix.

34 percent lighter than standard concrete
Perlite Concrete garden panels are 34% lighter

The drawback is the CSA cement is more expensive and sometimes harder to find. And, the portland ones appear to be strong enough, and light enough.
The colours worked well and blended evenly. I think I could have used less of the red as it came out deeper than I expected. The black looks pretty good though and I’d use that again. And maybe even more.
I’m happy with perlite and it makes a light, strong, and durable panel for these garden boxes. I wouldn’t hesitate putting them in my garden if weight was an issue for me.
In the next episode I’m going back to look at aircrete. I’ve worked on some new blends and got really good results. So that’s coming right up.
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4 thoughts on “Lightweight Concrete Garden Boxes – Pt 3.5 Perlite, Portland & CSA Cement”

  1. I’ve looked through all the various posts, but I can’t seem to find any specifics on the volumes of materials used per panel, only the ratios. I’d like to estimate how much of each material I need before I start the project. E.g. how far does one bag of cement go, etc.

    1. I was doing some “by eye” estimations as I was going. I was using a few form sizes too. I think on the blog pages I listed the weight of the panels and the reference regular concrete one. You might have to work backwards to get what you need. Also, there’s online concrete calculators that will tell you how much you need per volume. Plug in the size of the panel roughly and it will tell you.

  2. Hi Kent..THANKS for the very informative and detailed information in your videos and website..I was wondering which grade of perlite you used? Have you experimented with the different grades?

    1. I am not sure the exact grade of perlite I used. I bought it in a big bag from a local garden supplier. In the video I have a closeup (if I remember correctly) showing the size of the granules.

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