Mix two parts sand to one part cement (e.g., 6 pounds of sand and 3 pounds of cement).
Add 12 ounces of water to the dry mix.
Add 1% super plasticizer based on the weight of the cement for better workability.
Pre-mix dry materials, then add water gradually.
Use a mold release agent (diluted at 30 parts water to 1 part agent) to prevent sticking.
Pour the concrete mix into the mold and vibrate to remove bubbles.
Cover the mold with plastic and let it cure for 24 hours.
De-mold after 24 hours and allow further curing for at least 7 days before installation.
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