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Polymer modifying agent for concrete and mortars

MasterEmaco P157

SBR acrylic based bonding and polymer modifying agent for concrete and mortars

DESCRIPTION

MasterEmaco P157 is an aqueous emulsion of styrene-butadiene copolymer latex, specially formulated for use in cementitious mixtures to improve wear resistance, durability, waterproofing and bonding properties. MasterEmaco P157 is also compatible with sulphate-resisting or high alumina cement and gypsum plaster.

RECOMMENDED USES

MasterEmaco P157 is the ideal SBR-latex recommended for use:

  • With cement as a bonding slurry
  • In weather resistant exterior or interior renderings
  • In floor screeds and toppings, or plasters for improved chemical resistance
  • In repair of honeycombed and spalled concrete, beams and precast elements 

FEATURES AND BENEFITS

  • Easy to use - add to mixing water to improve mortars and screeds
  • Economical - can create a range of polymer modified mortars and screeds with simple variations with lower cement contents
  • Improved  work-ability  - mortars easier to apply
  • Addition of acrylic - Improved bonding and permeability and resistance to salts and other chemicals
  • Controlled shrinkage - Reduced cracking tendency 

PROPERTIES

  • Typical mortar modified with MasterEmaco P157: 28 days
  • Compressive Strength: 55-65 MPa
  • Flexural Strength:  10-13 MPa
  • Tensile Strength:  5-7 MPa
  • Bond (to substrate):  >1.5 MPa
  • Frost/Thaw resistance: Resists alkalis, chlorides, lactic acids, sugar etc.
  • VOC content SQAQMD 304-91: 50 g/L
  • The performance data is typical and based upon controlled laboratory conditions. Actual performance on the job site may vary from these values based on actual site conditions.
  • Supply form:  milky white liquid
  • Specific gravity :1.01
  • pH value: approx 10.5
  • Storage temperature: sensitive to frost
  • Application temperature: not below 5 C   

APPLICATION DIRECTIONS

Substrate Condition

The substrate must be clean, sound and free of dust and loose particles, cement laitance, oil, grease, mould release oil or curing compounds which must be removed from concrete surfaces by using gritblasting or other means.

Steel reinforcing bars clean to a minimum grade of SA 2 according to ISO 8501-1 / ISO 12944-4. For extra protection, or when the steel is left exposed before repair work is completed, apply MasterEmaco P 5000 AP active protection cement based primer. When repairing spalled or deteriorated concrete, ensure that the concrete has been cut back to sound material.

Before applying MasterEmaco P157, be sure to pre-wet the concrete substrate thoroughly to saturate the pores completely with water. During application of MasterEmaco P157, the temperature of the substrate should not be below 5 C. To avoid too high a surface temperature, it is advisable to shade application areas.

Mixing

Stir well before addition to mortar mixes. Mortars should be mixed in a pan type mixer or by means of a low speed Mixer (300-600rpm) with a helical paddle. Hand mixing is not recommended.

Method of use

Bonding slurry (priming) - Apply a slurry onto the still damp substrate, consisting of 1 part MasterEmaco P157 and 1 part by volume of cement, with a stiff brush. The mortar must be placed wet-on-wet. If the slurry does dry, a further slurry coat must be applied.

Renderings and repair mortars (to vertical surfaces) - After brushing the bonding slurry onto the prepared surface, apply immediately MasterEmaco P157 modified mortar (1:2 to 1:3), in average thicknesses of 10mm, as thicker layers tend to sag. However, several layers can be applied in quick succession. If thicker layers are applied, suitable formwork has to be used.

Screed and toppings (to horizontal surfaces) - Always place screed, topping or patching mortar onto the still wet bonding slurry. Use low watercement ratio for thick layers of mortar. Depending on use and exposure of the flooring mortar, premix the mixing water with MasterEmaco P157 in ratio of 1 part MasterEmaco P157 to 1-4 parts of water by volume. For extreme conditions, i.e. if adhesion, waterproofing, vapour resistance or chemical resistance is critical, the recommended ratio is 1:1, in case of low loading or stress, mix 1:4.

CURING

Freshly applied screeds and renderings, when mixed with MasterEmaco P157, should be kept damp and be protected from direct sunlight, rain, wind or frost, until sufficiently hardened.

Excessive rapid drying may cause shrinkage, insufficient strength and other defects.

PACKAGING

MasterEmaco P157 is available in a 5 litre and 20 litre pails.

SHELF LIFE

MasterEmaco P157 has a shelf life of 12 months.

Store out of direct sunlight and discard if subject to freezing.

PRECAUTIONS

For the full health and safety hazard information and how to safely handle and use this product, please make sure that you obtain a copy of the BASF Material Safety Data Sheet (MSDS) from our office or our website.

STATEMENT OF RESPONSIBILITY

The technical information and application advice given in this BASF publication are based on the present state of our best scientific and practical knowledge. As the information herein is of a general nature, no assumption can be made as to a product's suitability for a particular use or application and no warranty as to its accuracy, reliability or completeness either expressed or implied is given other than those required by law. The user is responsible for checking the suitability of products for their intended use.

 

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