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rmyers 03-05-2013 01:06 PM

use white sand
Should white sand be mixed with white mortar to keep the mortar white?

Tscarborough 03-05-2013 01:14 PM

Usually not unless white sand is all you have. White sand is normally beach sand which means it is round and relatively smooth, masonry sand is normally a sharp sand. For glass block they often do use white sand though.

Mort 03-06-2013 11:52 AM

Years ago we made white concrete for a grocery store, and we had to have white sand, rocks, and cement. I imagine your situation would be similar, any colored sand would overpower the whiteness.

Canarywood1 03-06-2013 03:16 PM

When we supplied the concrete for McDonalds Hamburger university training center,white concrete was specified for some floors,and they used 3 inches of regular concrete dry tamp for the base and topped it with white cement mixed with silica sand.

Mort 03-06-2013 07:15 PM

I know why they do it, but wouldn't painting the floor white every couple years be cheaper than the $400 per yard we were charging?

Tscarborough 03-07-2013 10:34 AM

The sand color doesn't have any effect on a properly mixed and finished slab. If it will be ground, obviously this does not apply.

stadry 03-09-2013 07:58 AM

white cement is all you need,,, IF you're really worried, call sher-wms for wtr soluble white pigment,,, we've done a couple floors for them guys - epoxy/urethane coatings after all the other trades were gone

TOOL82 03-11-2013 08:34 PM

It you want it white you need to use white sand. Don't believe me get different colored sands & make test batches. They will be close to the color of sand you are using. The color of the sand has nothing to do with it is acceptable to use in a particular mix. The ASTM # does C-33 for concrete mixes & C-140 something for mortar mixes.

Tscarborough 03-11-2013 08:39 PM

If you have sand exposed on a concrete slab, then you either ground it or did not mix it properly. The paste will coat each particle of aggregate and thus the color of the sand does not matter for normally finished concrete.

For mortar ( ASTM C-144 is the proper standard, FYI) it depends upon how and when you tool it as to whether the sand will make a difference in the color. Normally, in mortar it does because the joints are tooled, exposing the sand.

stadry 03-12-2013 05:50 AM

& that little lesson's priceless :thumbup:

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