User Manual Q&AAnswer
Mar 18, 2024 - 02:37 AM
The recommended ratio for mixing Portland cement with sand is 1 part cement to 2 or 3 parts sand, depending on the desired compression strength. A 1:2 ratio will yield concrete with approximately 3500 pounds per square inch (PSI) compression stress, while a 1:3 ratio will yield slightly less than 3000 PSI, which is typical for house slabs, footings, and sidewalks. It is important to note that adding gravel or crushed stone to the mixture is optional and can be done at a ratio of up to 5 parts gravel to 1 part cement and sand mixture. The gravel acts as a filler and does not affect the tensile strength of the concrete unless added excessively, which may make it difficult to achieve a smooth finished surface. The normal ratio for a complete mix is 1 part cement, 2 parts sand, and 3 parts gravel. It is generally recommended to avoid using more than 1 part Portland cement to 2 parts sand in a sand-only mix.
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