Concrete sealants, alternatively referred to as concrete sealers or coatings, are applied to concrete surfaces to safeguard them from diverse environmental elements and prolong their durability. These substances create a protective layer on the concrete surface, mitigating potential damage from moisture, chemicals, UV rays, and other contributing factors.
In 2021, the worldwide market size for Concrete Sealers reached USD 402.17 million, with projections indicating a growth at a CAGR of 8.9% throughout the forecast period. Anticipated to reach USD 670.65 million by 2027. The genesis of the concrete seal curing agent dates back to post-World War II, where a German scientist in California pioneered its development. Over subsequent decades, the formula evolved from sodium-based to lithium-based silicate raw materials, though the market for it has essentially diminished.
Types of concrete sealants
Depending on the type of application and requirements for concrete protection and aesthetics there are several options for sealants. Here are some common types of concrete sealants:
- Penetrating Sealers: These sealers penetrate into the pores of the concrete, creating a barrier that repels water and other contaminants. They are often used for outdoor applications and are suitable for driveways, sidewalks, and other exterior surfaces.
- Acrylic Sealers: Acrylic sealers form a thin protective film on the surface of the concrete. They provide good UV resistance and are available in various finishes, such as glossy or matte. Acrylic sealers are commonly used for decorative concrete surfaces, such as stamped concrete or exposed aggregate.
- Epoxy Sealers: Epoxy sealers create a strong and durable surface on the concrete. They are resistant to chemicals, stains, and abrasion, making them suitable for industrial and commercial applications. Epoxy sealers are often used on garage floors, warehouse floors, and other high-traffic areas.
- Polyurethane Sealers: Polyurethane sealers offer excellent resistance to abrasion, chemicals, and UV rays. They provide a durable and glossy finish, making them suitable for both indoor and outdoor applications. Polyurethane sealers are commonly used in areas where a high level of protection and aesthetic appeal is desired.
- Silicate Sealers: Silicate sealers react with the concrete to form a crystalline structure within the pores. This strengthens the concrete and increases its resistance to water and chemicals. Silicate sealers are often used in industrial settings and on concrete floors.
- Polyaspartic Sealers: Polyaspartic sealers are a type of fast-curing sealant that provides high-performance protection for concrete surfaces. They are often used in applications where a quick return to service is essential, such as in commercial and industrial settings.
It’s important to note that the choice of a concrete sealer depends on the specific requirements of the project, including the type of concrete, its intended use, and the environmental conditions it will be exposed to. Proper surface preparation is also crucial to ensure the effectiveness of the sealant. Always follow the manufacturer’s guidelines for application and maintenance to maximize the longevity and performance of the concrete sealant.
What are the main requirements for concrete sealers?
The main requirements for concrete sealers depend on the specific characteristics of the concrete surface, its intended use, and the environmental conditions it will be exposed to. Here are some key requirements to consider when choosing a concrete sealer:
It’s important to carefully assess these requirements based on the unique characteristics of the concrete surface and the conditions it will face to select the most suitable sealer for the job. Additionally, always follow the manufacturer’s recommendations and guidelines for proper application and maintenance.
Choice for type of coating
The expected life time, and thus also maintenance frequency, can be important in choosing the correct type of sealant.
FILM FORMERS
Acrylics, epoxies, and urethane coatings form films that cover the surface of your concrete. They provide a layer of protection and make your concrete easier to maintain.
- Acrylic concrete sealers – Last 1 to 3 years
- Epoxy coatings – Last 5 to 10 years
- Urethane coatings – Last 5 to 10 years
PENETRATING SEALERS
Penetrating concrete sealers are available in solvent and water-based systems and continue to react with the concrete over time. They don’t change the appearance of concrete, but they work to repel moisture and stains.
- Silicate concrete sealers – These never break down, they densify and harden concrete and continue to react with it chemically throughout the life of the concrete
- Penetrating silane siloxane concrete sealers – Last six months to 10 years, depending on the product
- Silicone water-repellent sealers – Create a chemical bond that lasts for six months to 7 years, depending on the acid content and the quality of the product
Other factors that influence the longevity of your concrete sealer include the quality of the product, how you apply it, and how many coats you used.
As the most commonly used film forming concrete coatings are 2k products, epoxy or polyurethane. Two guideline formulations are given below. Depending on the final coating requirements, these can be tailored to achieve good performance.
Guideline formulations:
2k Epoxy clear sealer [1]
2K-PU flooring flexible, self-leveling, solvent-free[2]
[1] 2K Waterborne Sealer – Clear (Formulation #148/024 – 018) on ULProspector.com
[2] Hoffmann Mineral https://www.hoffmann-mineral.com/guideformulation/file/1372
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