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Concrete Countertop with Sink Mix

Last modified by
on
Aug 19, 2024, 5:55:25 PM
Created by
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Feb 14, 2022, 4:19:50 PM
cM=f(L,W,T,sWid,sLen)
Toggle Units
(L)Length of Countertop
ft
in
(W)Width of Countertop
ft
in
(T)Thickness of Countertop
in
(sWid)Sink Width
ft
in
(sLen)Sink Length
ft
in
Tags
Masonry Mass Concrete Weight countertops
UUID
ef27c8ac-8db1-11ec-a69b-bc764e203090

The Concrete Countertop Mix calculator estimates the materials needed for a solid rectangular concrete countertop with a rectangle sink opening. /attachments/e80151aa-5bd8-11e5-a3bb-bc764e2038f2/Slab.JPG

INSTRUCTIONS: Choose units and enter the following:

  • (L) Length of Countertop
  • (W) Width of Countertop
  • (T) Thickness of Countertop
  • (sWid) Sink Width
  • (sLen) Sink Length

Concrete Countertop Mix (cM): The calculator returns the volume (measure) of materials needed for the countertop.  The calculator returns:

  • (PC) Weight of Portland Cement (Type 1 or Type 2)
  • (AP) Alto-Pozz (pozzolans and mineral admixture)
  • (SA) Sand / Aggregate (50/50 mixture)
  • (WT) Water
  • (FM) Fibermesh Reinforcement (PVA 8mm fibers)
  • (WR) Water Reducer (Optimum 380 premium superplasticizer)
  • (DF) Defoaming and Densifying additive

The calculator also returns:

  • (V) Volume of concrete in countertop
  • (W) Weight approximation of countertop
  • (A) Surface area of countertop

The Math / Science

The calculator first computes the volume of concrete needed for the countertop with a sink opening.  The formula for the volume of concrete in a countertop with an opening for a sink is:

V = T* (L*W - sWid * sLen) 

where:

  • V = volume of concrete in the countertop
  • L = Length of Countertop
  • W = Width of Countertop
  • T = Thickness of Countertop
  • sWid = Sink Width
  • sLen = Sink Length

Based on the volume of concrete, the following recipe is used for 1 cubic foot of concrete to compute the volume of materials for the countertop:

  • 32 pounds of Portland cement
  • 8 pounds of Alto-Pozz
  • 90 pounds of 50-50  sand / aggregate mix
  • 14.5 pounds of water (1.737 gallons)
  • 200 grams of fiber mesh (PVA 8mm fibers)
  • 120 ml plasticizer (Optimum 380 premium superplasticizer)
  • 30 ml defoaming additive (C-64 defoaming & densifying additive) 

Thanks to Everything About Concrete and Mike Day for the recipe above.  His site provides valuable additional information and guidance.

DIY Countertop Calculators
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