CRETE-MOD&#; is a low-odor acrylic polymer emulsion designed for modifying Portland cement compositions. The superior adhesion, ultraviolet light resistance, water resistance, and increased mortar strength properties provided by previous acrylic emulsions have been complemented by improved sprayability in a low-odor formulation. Cement mortars modified with CRETE-MOD&#; are hard, tough, and durable to exterior exposure. Compared with unmodified mortars, acrylic polymer-modified mortars have superior flexural, tensile, and impact strengths, as well as excellent abrasion resistance and adhesion. These qualities are especially important in thin section applications (i.e. spray coatings, stuccos, and underlayments) and applications where excessive vibration and heavy traffic are encountered. CRETE-MOD&#; modified cement mortars have excellent adhesion to a variety of surfaces such as concrete, masonry, brick, wood, rigid polystyrene and polyurethane foam, glass, and metals. CRETE-MOD&#; modified mortars are uniform in color and resistant to yellowing or discoloration due to exposure to ultraviolet light. They also provide excellent water resistance to decrease spalling, cracking, and surface degradation caused by repeated freeze/thaw cycles. These mortars are also resistant to many industrial chemicals. CRETE-MOD&#; is ammonia-free, this low-odor feature is especially beneficial for interior construction or repair projects. CRETE-MOD&#; emulsion has also been optimized to provide a longer mortar pot life, an important feature for warm weather, low humidity application conditions. Further, the emulsion properties have been improved to enhance the flow characteristics of the modified cement for spray coat applications.
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CRETE-MOD&#; is a product with exceptional versatility. It can be used in a variety applications including: regular weight and lightweight spray-applied coatings, traditional trowel-applied stuccos, basement waterproof coatings, general purpose patching and repair mortars, floor resurfacing and underlayments, terrazzo, and heavy use industrial/commercial cement flooring. CRETE-MOD&#; also provides a superior binder for certain non-cementitious products such as one-package tile grouts.
The general procedure for preparing CRETE-MOD&#; modified mortar for evaluation begins by thoroughly premixing the sand and cement. The CRETE-MOD&#; and water are blended together and added to the premixed sand and cement. The entire composition is mixed thoroughly for about two to four minutes. To avoid overly fluid compositions, a portion of the water should be withheld and added gradually to the modified mortar mixture until the desired consistency is obtained. Although the procedures generally remain the same, the formulation varies according to the performance needs of the application situation. These formulations can vary in both the type and quantity of materials used. While numerous component relationships exist, some key formulation concepts are presented below: Choice of Filler - The type and particle size distribution of fillers are selected for reasons which include cost, density, color/texture of the final product, leveling characteristics and workability. Sand (filler)/Cement Ratio - For a typical modified mortar application, a 2:1 sand/cement ratio provides excellent mechanical strength properties. However, different ratios of filler to cement may be appropriate for applications with different performance requirements. Level of Water - Maximum density and strength are obtained when a minimum amount of water is used. This minimum water requirement refers to the lowest water/cement ratio which provides adequate workability. Level of Polymer Modification - An optimum balance of modified mortar properties (adhesion, tensile strength, flexural strength, compressive strength, impact resistance, water resistance and abrasion resistance) is obtained by incorporating 10 to 20 percent polymer solids, by weight, on cement. Higher modification will increase flexibility and water resistance. Lower levels of polymer will decrease the benefits of the polymer modification. RECOMMENDED MIXING RATIO: Cementitious materials should be pre-mixed to achieve a ratio of 2 Parts Sand and 1 part Cement. (Refer to the Data Sheet of the product to determine if sand is already in the mixture.) Use approximately 2 to 3 Quarts of CRETE-MOD&#; and 2 to 3 Quarts of Water to 50 pounds of pre-mixed cementitious material. Hold out some water to avoid an overly fluid mixture.
With the addition of five to fifteen percent dry latex to dry concrete, styrene butadiene, styrene acylic, and all acrylic emulsion polymers improve flexibility, reduce cracking, enhance adhesion to most substrates, improve water resistance, and increase hardness of latex modified concrete pastes, mortars, and grouts.
Additional benefits of using styrene butadiene latex emulsion as a concrete admixture is that it provides excellent chemical attack and freeze-thaw resistance.
When UV resistance is needed, an acrylic emulsion polymer resists premature fading and yellowing. Moreover, because an acrylic holds up well to oils and solvents, it is an excellent admixture for use in decorative concrete applications.
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