Types S and M
Victor Plastic Cement conforms to the requirements of Type S and Type M for ASTM C91 ”Masonry Cement” and ASTM C1328 “Plastic (Stucco) Cement. (Table 1)
Victor Plastic Cement consists of a mixture of Portland cement, limestone, and chemical admixtures to provide plasticizing properties and other enhanced performance attributes. These components are proportioned at the cement plant under controlled conditions for product consistency.
Stucco: Victor Plastic Cement when mixed with the recommended volumes of sand (ASTM C897) will produce a stucco mix that will comply with the proportion requirements for ASTM C926 “Application of Portland Cement - Based Plaster.” for plaster Types M and FM.
Masonry: Victor Plastic Cement when mixed with the recommended volumes of sand (ASTM C144) will produce a mortar that will comply with the requirements of ASTM C270 for both t he Proportion Specification and Property Specificati on for Type N, S, and M mortars for non - structural, non - loadbearing masonry construction.
Limitations: Plastic cement is not approved for use in loadbearing structural masonry construction in Seismic Zone s 2, 3, and 4.
Availability: Victor Plastic Cement is available in bulk or 94 pound bags.
Proportioning: The stucco mixture should be produced with sand meeting the requirements of ASTM C926. The stucco mixture shall be proportioned in accordance with ASTM C926 for base coats and finish coats. (Table 2).
Mixing: Approximately two thirds of the water should be added to the mixer with one half of the sand followed by the Victor Plastic C ement. Add the remaining sand and sufficient water to reach the desired consistency and mix for no less than five full minutes.
No admixtures should be used without the written approval of the architect or engineer of record. Victor Plastic Cement h as an additive containing a water - repellent component which is interground with the cement during manufacture.
Water: All water should be clean and free from organic material and deleterious amounts of dissolved acids, alkalis and salts.
Application: The plaster coats should be applied in accordance with the requirements of ASTM C926.
The yield or coverage of plaster will vary depending on the thickness of the plast and the amount of sand used per bag of Victor Plastic Cement. (Table 3)
Curing: A light fogging with water two times a day for three days will preserve the appearance of the wall while minimizing drying shrinkage, cracking and its associated de - bonding. It is recommended that users adhere to the curing procedures provided in ASTM C926.Close
Table 1. ASTM C1328 Plastic Cement
|Masonry Cement Type||Compressive Strength 28 Day Minimum||Water Retention Min. %||Air Content Max. %|
Table 2. Plaster Coat Proportions (Parts by Volume)
|Cement Type||Fine Aggregate|
|Plaster Mix||Masonry Cement||Plastic Cement||Scratch Coat||Brown Coat||Finish Coat|
|MS||1||-||2 ½ - 4||3 - 5||-|
|P||-||1||2 ½ - 4||3 - 5||-|
|FMS||1||-||-||-||1 ½ - 3|
|FP||-||1||-||-||1 ½ - 3|
Table 3. Yield Based on Plaster Thickness and Mix
|Area Covered per Bag (Square Feet)*|
|Mixture Volumes||Thickness of Stucco Coats|