Bonding Agents

Bonding agents are natural, compounded or synthetic materials used to enhance the joining of individual members of a structure without employing mechanical fasteners. These products are often used for the bonding of fresh concrete, sprayed concrete or repair mortar to hardened concrete. Although good adhesion may be obtained without a bonding agent, generally a bonding layer consisting of cement and sand slurry, cement/latex slurry or epoxy increases bond strength.

The main types of bonding agents used in the construction industry are latex emulsions and epoxies. Among the different types of latex bonding agents are –

  1. Styrene Butadiene (SBR) latex is a carboxylated styrene butadiene copolymer that acts as an integral adhesive for cement bond coats, mortars and concrete to improve bond strength and chemical resistance.
  2. Polyvinyl Acetate (PVA) latex are used in repair as non-re-emulsifiable and emulsifiable. Non-re-emulsifiable PVA forms a film that offers good water resistance, ultraviolet stability, and aging characteristics. Owing to its compatibility with cement, it is widely used as a bonding agent and as a binder for cementitious water-based paints and waterproofing coatings. Emulsifiable PVA produces a film that can be softened and rewetted with water. This type of latex permits the application of a film to a surface long before the subsequent application of a water-based overlay. Its use is limited to specific applications where the possible infiltration of moisture to the bond line is precluded. It is most widely used as a bonding agent for plaster, and to bond finish or base-coat gypsum, or Portland cement plaster, to interior surfaces of cured cast-in-place concrete.
  3. Acrylic latex ester resins are polymers and copolymers of the esters of acrylic and methacrylic acids. Their physical properties range from soft elastomers to hard plastics. This type of emulsion is used in
    cementitious compounds in much the same manner as SBR latex.

In addition, there are epoxy bonding agents available for the bonding of freshly placed concrete to cured concrete and of concrete to steel. Most products contain resins that are 100% solids. They may or may not contain fillers, such as calcium carbonate or silica flour, and other additives to enhance a particular property or reduce cost.

Saint-Gobain Weber Bonding Agents

Webertec SBR

Webertec SBR is a styrene-butadiene copolymer latex liquid, with 47% solid content, which can be used as a modifier for concrete/cement mortar, providing them properties, so that they can be used for waterproofing, for repairs of spalled concrete and plaster, as a bonding agent and for high-performance plaster.

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Webertec SBR LitX

Webertec SBR litX is a styrene-butadiene copolymer latex liquid, with 37% solid content, which can be used as a modifier for concrete/cement mortar, providing them properties, so that they can be used for waterproofing, for repairs of spalled concrete and plaster, as a bonding agent and for high-performance plaster.

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Tremco Bonding Agents

Tremco SBR Latex

Tremco SBR Latex is a carboxylated styrene butadiene copolymer latex admixture that is designed as an integral adhesive for cement bond coats, mortars and concrete to improve bond strength and chemical resistance.

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