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Victor Plastic Cement For Portland Cement Plaster


Basic Use

CEMEX’s Victor Plastic Cement is specially formulated and manufactured to produce a cementitious binder for Portland Cement Plaster.

Composition and Materials

CEMEX’s Victor Plastic Cement consists of a mixture of Portland Cement and plasticizing materials (such as limestone, hydrated or hydraulic lime) together with other materials introduced to enhance one or more properties. These components are proportioned at the cement plant under controlled conditions to assure product consistency.

Types

CEMEX’s Victor Plastic Cement is produced to meet the requirements of UBC Standards 25-1 for the production of Portland Cement-Based Plaster as designated in ASTM Standard Specification C-926 (Application of Portland Cement-Based Plaster).

Limitations

CEMEX’s Victor Plastic Cement is designed to be mixed with sand and water. The addition of hydrated lime or any other materials to a plastic cement plaster at the job site is not required or recommended.

Related Standards

The following standards are related to the use of CEMEX's Plastic Cements:

ASTM C-91 (Standard Specification for Masonry Cements)

ASTM C-926 (Standard Specification for Application of Portland Cement-Based Plaster)

ASTM C-897 (Specification for Aggregate for job mixed Portland Cement-Based Plasters)

ASTM C-1328 (Standard Specification for Plastic (Stucco) Cement)

Water

All water should be clean and free from organic material and deleterious amounts of dissolved acids, alkalies and salts.

Physical Properties

CEMEX’s Victor Plastic Cement provides consistent workability, strength, durability, appearance and meets UBC and ASTM physical requirements for plastic cements. (See Table 1).

Table 1 Uniform Building Code, Physical Requirements for Plastic Cements
Fineness, residue ona No. 325 sieve (45*m), maximum, percentage 24
Soundness:
  Autoclave expansion, maximum, percentage

1.0
Time of setting, Gilmore method:
  Initial set, minimum, hour
  Final set, maximum, hour

1-1/2
24
Compressive Strength (average of three cubes): Initial compressive strength of mortar cubes, composed of one part cement and three parts blended sand (half graded Ottawa sand, and half Standard 20-30 Ottawa sand) bye volume, prepared and tested in accordance with this specification shall be equal to or higher than the values specified for the ages indicated below: 7 days, psi (kPa)
1,800(12 402 kPa)
28 days, psi (kPa)
2,900 (19 981 kPa)
Air content of mortar
Minimum percentage by volume

8
Maximum percentage by volume 20
Water retention, minimum flow after suction, percentahe of original flow 70

Durability

Properties of plastic cement plaster related to its durability include:

  • Drying shrinkage characteristics. Results of laboratory test shown in Figure I indicate that the drying shrinkage of plastic cement plaster is about half that of Portland Cement-Lime Plaster (See Figure 1).
  • Resistance to sulfate attack. Plastic Cement Plaster also demonstrates significantly greater sulfate resistance than Portland Cement-Lime Plaster (See Figure II).
  • Water permeance. Laboratory research has confirmed the excellent performance of plastic cement plaster in water permeance tests (See Figure III).

Figure I. Sulfate Expansion of Masonry Mortars
Figure II. Sulfate Expansion
Figure III. Water Absorption

Preparation

CEMEX’s Victor Plastic Cement proportioned with sand meeting ASTM C-897 will produce plaster meeting the requirements of ASTM C-926. Under the requirements of ASTM C-926 (Table 3, Base Coat Proportions), cement-to-sand proportions for job mixed plaster are to be in the range of 1:2½ to 1:4 for the Scratch coat and 1:3 to 1:5 for the Brown coat.

In accordance with ASTM C 926 - All plasters shall be prepared in a mechanical mixer, using sufficient water to produce a workable consistency and uniform color.

Hot Weather and Retempering

Plaster exposed to hot winds and full sun will tend to lose workability due to the evaporation of water. Common sense precautions such as shading the mixer, covering wheelbarrows and tubs, and balancing plaster production to meet demand should be taken to protect the plaster. If it is necessary to restore workability, plaster may be retempered by adding water and remixing. No plaster mix should be used or retempered beyond one hour after the initial mixing.

Cold Water Precautions

Mortar should be maintained at a minimum temperature of 40° F as prescribed by standard cold weather masonry specifications. Cold weather admixtures should be approved by the architect.

Sand should be protected and/or heated to prevent ice from forming. The fresh work should be protected at a minimum temperature of 40°F (6°C) for a least three days to provide proper curing for the plaster.

Availability

CEMEX’s Portland Cements can be ordered by contacting at CEMEX Customer Care at:

Customer Care  |   1-800-99-CEMEX

Maintenance

Avoid use of harsh chemical cleaners or strong acid solutions in cleaning plaster.

Technical Services Personnel

CEMEX personnel are available to provide technical assistance by contacting Customer Care at: 1-800-99-CEMEX (1-800-992-3639).

Warranty

CEMEX warrants that the products identified are in accordance with the appropriate current ASTM and Federal Specifications. No one is authorized to make any modifications or addition to this warranty. CEMEX makes no warranty or representation, either expressed or implied, with respect to this product, and disclaims any implied warranty of merchantability or fitness for a particular purpose.

CEMEX warrants that the products identified are in accordance with the appropriate current ASTM and Federal Specifications. No one is authorized to make any modifications or addition to this warranty. CEMEX makes no warranty or representation, either expressed or implied with respect to this product, and disclaims any implied warranty of merchantability or fitness for a particular purpose.

As CEMEX has no control over the other ingredients mixed with this product or the final application, CEMEX does not and cannot warrant the finished work.

In no event shall CEMEX be liable for direct, indirect, special, incidental or consequential damages arising out of the use of this product, even if advised of the possibility of such damages. In no case shall CEMEX’s liability exceed the purchase price of this product.

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