Question about Building Materials
For basic mix use (mix by volume):
4 parts sand
1 part aggregate (stones about 1/4" to 3/4")
1 part cement
1.5 part water (adjust accordingly! that amount is average! add 1 part first and then splash during mix till you have consistent doughy structure! if for pouring - add all of that and then up to 1/2 part more)
this mix is good to use as base under the tiles, foundations for mounting paving, stones, benches, first layer of render on the wall, and whatever will be covered with something else.
for working floor use following mix:
3 part sand
1 part aggregate
1.5 part cement
1.25 to 1.5 part water - see remarks above
there is several other proportions and mixes, unfortunately exceeding scope of this short answer
Posted on Dec 14, 2014
Concrete is not just a mixture of cement to water. Concrete is a blend of different mortar and or concrete sands. And an aggregate rock if creating foundation or slab structures. Generally you can buy a concrete blend sand with aggregate, (either gravel or river rock round ,(uptown 2"), at a local landscape supply shop. Or they sell pre mix bags of ready mix that you just add water too. Dependant on the desired slump that works best.
A good do it yourself mix is 3to1 or 4to1. 4 parts concrete sand blend to one part cement. Water depends on slump. Buckets work great for measuring. Use a concrete mixer with aggregate sandcastle mortar mixer without aggregate.
Posted on Jun 29, 2014
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Posted on Jan 02, 2017
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Hello. The typical volume-ratio for a self-mix concrete in this application would be one part Portland cement to three parts sand. For a stronger pad (capable of higher stress loads) it would be as low as two parts sand, but this is not necessary for a standard patio pour. The gravel should be three parts, more will make it tougher to achieve a smooth finish. Re-cap: Portland cement - 1 part, sand - 2 or 3 parts, gravel - 3 parts. Hope this helped.
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