Concrete is a widely used building material due to its high strength values and weather resistance. For adhesive applications, there are a variety of products on the market for a wide range of uses, such as bonding add-on or built-in parts, fastening anchors or heavy-duty dowels, sealing parts of buildings or for the quick and easy repair of concrete surfaces. However, it's important you select the optimal adhesive for the respective application.
Concrete, or reinforced concrete, has become an indispensable building material. In the construction of houses, it's mostly used for ceilings, columns and ring beams, and in larger buildings for walls and foundations.
The construction of high-rise buildings and skyscrapers, tunnels, bridges and retaining walls is usually only made possible by using concrete.
There is a suitable adhesive for concrete for almost every requirement, but there are a few things to bear in mind beforehand:
Adhesives can be used when drilling, dowelling or screwing is not possible or should be avoided. Further advantages are that bonding does not require expensive tools, generate noise or drilling dust.
This can be done, for example, with viscoplastic, viscous 2-component construction adhesive with epoxy resin formulation. This has high strength, good ageing behaviour and a long working time.
Professional tip: There are countless rubber mixtures, each with different adhesive properties. The bond can be damaged, weakened or even destroyed by diffusion (migration) of ingredients of the rubber compound (sometimes only after prolonged use and exposure to heat). It's therefore important to find out in advance which adhesives are suitable for which type of rubber.
Important: Always clean and roughen rubber surfaces thoroughly first.
Bare metals (aluminium, iron, steel, stainless steel, brass, copper, zinc sheet etc.) have different adhesive properties.
Important: The surfaces must be clean and free of grease. Tip: The adhesive properties can be improved by sanding the adhesive surface.
2-component adhesives based on PUR or epoxy resin are usually suitable here. For some metal combinations or metals (e.g. stainless steel), 2-component adhesives based on MMA also work.
Especially for the construction industry (bonding concrete / stone to metal, e.g. aluminium), viscoplastic 2-component construction adhesives based on acrylate (fast initial strength) or epoxy resin (high final strength) such as Scotch-Weld 7271 B / A from 3M are suitable. The hybrid construction adhesive with a short working time of 12 minutes is non-flowing - therefore also ideal for overhead bonding.
Permanently elastic adhesive/sealants or 2-component adhesives based on epoxy resin also work here.
Suitable: depending on the requirements, 2-component adhesives based on epoxy resin or permanently elastic sealing/adhesive compounds, but also 2-component MMA as well as 2-component PUR adhesives.
This is not an entirely unproblematic combination of materials, especially because of the large number of thermoplastics (e.g. PC, PA, PS, ABS, SAN, etc.).
A possible adhesive for concrete-plastic bonding here is 3M™ Scotch-Weld™ Low Odour Acrylic Adhesive DP88XX, a construction adhesive based on acrylate (MMA) viscoplastic, which cures well even at room temperature. This also bonds concrete to metals such as aluminium, steel and stainless steel.
This application is often used for insulation on concrete or masonry.
Special adhesives are required for Styrofoam panels. Solvent-free and flame-retardant adhesives are a prerequisite here. This is because adhesives containing solvents can cause the material to decompose. Immediate initial strength is also usually necessary for these large-area bondings. This can only be achieved with high-performance contact adhesives (adhesive application to both material surfaces).
For quick and easy repair of concrete surfaces, 3M offers a self-levelling two-component polyurethane construction adhesive e.g. for repair work in production halls with concrete floors. Scotch-Weld DP 600 SL cures smoothly even in deep joints and cracks - the compound is even more durable than repairs using concrete. The new adhesive is also suitable for the installation of windows or doors and performs well when fixing anchors, light bolts in concrete surfaces.
Generally, polyurethane installation adhesives cross-link by means of moisture, either from the substrate or from the ambient air - but fixing (for heavy objects) and pressing on are necessary. PU adhesive cures quickly, bonds rigidly but very firmly, it can be used indoors and outdoors (low UV stability) and has good water resistance.
Concrete fabric tape is best suited for sealing concrete formwork and fixing foils, for example during high-pressure cleaning and plastering work. Such a supple, strongly adhesive, tear-resistant and waterproof fabric tape not only adheres strongly to concrete, but also to stone, masonry and other porous surfaces. 3M Concrete Fabric Tape 399, for example, is especially suitable for outdoor applications.
Especially if the floor surface has been heavily smoothed, concrete floors are usually much denser and less absorbent than the usual screeds. This then leads to lower adhesion of primers as well as adhesives. In addition, concrete often contains a spectrum of additives that may accumulate on the surface.
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