Portland cement should not be used without aggregate to make a rigid surface. It will be brittle and have very little strength. QUIKRETE® Sand/Topping Mix (No.1103), in conjunction with QUIKRETE® Concrete Acrylic Fortifier (No.8610) replacing half of the required water content, is the combination of products recommended for a shower pan or a mortar bed for shower base or bathtub installation. ANSI 108.1 provides application and material requirements for shower pans and bathtubs. It is critical that the subfloor / structure underneath be rigid. Bathtubs require secure and adequate support because of the combined weight of the tub, person, and water. Please consult and follow local building /plumbing code requirements.
To get 1 cubic yard of concrete using the ratio of 1 part Portland, to 2 parts concrete sand, to 3 parts gravel by VOLUME, approximately the following would be required: 570 pounds QUIKRETE Portland (~6-94 lb bags), 1212 pounds QUIKRETE All Purpose Sand (~12 ¼-`100 lb bags), 1818 pounds QUIKRETE All Purpose Gravel (~18 1/4 -100 lb bags) for a total of 3600 pounds of dry material. These are estimates, and will vary based upon waste, uneven subgrade, etc.
The amount of Portland cement necessary will depend on the mix design you use. If using the standard 1:2:3 proportion of cement to sand to gravel, each 94-pound bag of cement can be used for 6 cubic feet of concrete. A 4’ by 8’ pour at 4” thick will require 10-2/3 cubic feet of concrete, or 2 batches as described. Yields will vary with waste, uneven subgrade, etc.
QUIKRETE Portland Cement should be blended with aggregates prior to use. Depending on your desired thin layer, a variety of options are available. Please contact our customer support representatives at 800-282-5828 or online via LiveChat at www.quikrete.com for product selection advice.
The density of portland cement 94 pounds per cubic foot. The bags are sized to accommodate this mass.
To make stucco, you will need to blend 1 Part QUIKRETE ® Portland Cement with 1/2 parts Hydrated Lime Type S (meeting ASTM C206 / C207) and 4-1/2 to 6 parts Plaster Sand (meeting ASTM C897). Alternately, we provide a preblended Scratch & Brown Base Coat Stucco which has these materials already blended in the correct proportions.
QUIKRETE® Portland Cement can be blended with construction grade sand to repair cracks in an adequately prepared concrete substrate.
Each 94-pound bag of Portland cement, when used in the recommended 1:2:3 volumetric ratio, will generate approximately 4 cubic feet of mixed concrete. For an area of 19 feet by 6 feet at 4” thick, you will need 38 cubic feet of concrete, or 10 94-pound bags of cement. Yields will vary with waste, uneven subgrade, etc.
Portland cement by itself has very little strength. It must be blended with aggregate to develop strength. A blend of portland cement with sand can be used to patch holes in a pond.
I would call Tech Support at Quickcrete.