How to Seal Shrinkage Cracks
Shrinkage Cracks Sealed at Wastewater Treatment Plant
Introduction:
In wastewater treatment plants, maintaining the integrity of concrete structures is crucial for safe and efficient operations. Shrinkage cracks, especially around pipe penetrations, are common but problematic, leading to water infiltration, contamination risks, and structural deterioration. These cracks compromise the durability and safety of facilities, resulting in increased maintenance costs and potential environmental hazards.
Addressing shrinkage cracks requires specialized solutions that comply with stringent safety standards, particularly for structures in contact with potable water. SealBoss’s advanced polyurethane injection systems are designed to effectively seal these cracks, preventing water seepage and ensuring long-term structural integrity. By forming a closed-cell foam upon contact with water, these systems provide a durable barrier against leaks and contaminants.
This article explores the causes of shrinkage cracks, their implications for wastewater infrastructure, and innovative NSF-certified sealing methods that enhance durability and operational safety.
Understanding Shrinkage Cracks in Concrete
What are Shrinkage Cracks?
Shrinkage cracks are a natural occurrence in concrete structures that form during the curing and drying process. Concrete, a blend of cement, aggregate, and water, undergoes a volume reduction, or shrinkage, as the water used in the mix evaporates. This process of evaporation causes the concrete mass to shrink and contract.
Simultaneously, the internal reinforcements or sub-bases that the concrete is poured onto restrict this shrinkage. This restriction generates tensile stresses within the concrete. When these stresses exceed the concrete’s tensile strength, they give rise to drying and shrinkage-related cracks.
Shrinkage cracks, although often very small, are of significant concern in certain structures. Even though they typically don’t compromise the structural integrity of the concrete, they can create pathways for water and other corrosive materials. This is particularly crucial in structures like dams, where minor leaks can have substantial implications.
Moreover, it’s important to note that the shrinkage of concrete and the subsequent development of cracks is an irreversible process. Therefore, any resulting water leakage needs to be addressed with suitable methods such as concrete crack injection.
Effective Sealing of Shrinkage Cracks at a Wastewater Treatment Plant
Scope
At the wastewater treatment plant in Salina, Kansas, leaks were detected around pipe penetrations and shrinkage cracks in the concrete structure during testing. These leaks posed a challenge that needed to be resolved before installing pumps and pipes in the pump room.
Procedure
To address the issue, a Regional Technical Sales Manager from SealBoss conducted an on-site consultation, recommending the use of SealBoss 1510 Water Stop Foam. This hydrophobic polyurethane resin is designed to expand upon contact with water, forming a closed-cell foam that effectively seals shrinkage cracks and prevents water penetration.
The application involved a high-pressure injection process using the SealBoss P2002 injection system, paired with SealBoss 13-100 AL series injection packers. These packers are ribbed to withstand the high pressure of the injection, ensuring a reliable and durable seal. This approach provided a robust solution for sealing the leaks and protecting the integrity of the concrete structure.
Comprehensive Approach
The combination of on-site consultation, high-quality materials, and specialized equipment highlights SealBoss’s commitment to delivering effective and long-lasting solutions for infrastructure maintenance. The successful application at the Salina wastewater treatment plant is a testament to the effectiveness of SealBoss’s comprehensive approach to concrete repair and waterproofing.
Employed Products:
SealBoss 1510 superior penetration through hairline cracks
SealBoss ® 1510 NSF Approved Water Stop Foam
Shrinkage cracks around pipe penetrations are a common issue in wastewater treatment plants, leading to water seepage from tanks and basins. These leaks pose operational and maintenance challenges and require solutions that comply with strict safety and environmental standards.
SealBoss 1510 Water Stop Foam is a hydrophobic polyurethane resin specially designed to address these issues. Upon contact with water, it expands into a closed-cell, semi-flexible foam that effectively seals cracks and stops leaks. This product is NSF/ANSI/CAN 61 certified, making it safe for contact with drinking water. Its chemical-resistant properties and adjustable reaction times provide contractors with flexibility and long-term reliability, even in challenging environmental conditions.
The NSF/ANSI/CAN 61 certification ensures that SealBoss 1510 meets the highest safety standards for drinking water contact. This certification is vital for projects involving water treatment plants, containment structures, and other systems where water safety is a priority. It guarantees that the product will not leach harmful contaminants into the water supply, safeguarding public health and complying with regulatory requirements.
SealBoss is committed to providing safe and effective waterproofing solutions. With a history of serving the industry since 1988, SealBoss products are trusted by contractors, architects, and engineers worldwide. Our Full System Solutions include a comprehensive range of injection accessories, ensuring seamless integration and support throughout every stage of the injection process.
By choosing SealBoss®, you gain access to high-quality, certified materials and reliable technical support from a single, dependable source. This commitment to safety, durability, and efficiency makes SealBoss 1510 Water Stop Foam an essential choice for infrastructure repair and maintenance.
Related Super Low Viscosity SealBoss Chemical Injection Grouts:
- SealBoss ® 1403 SLV Super Low Viscosity Polyurethane Resin for injection into very fine cracks.
- SealBoss ® 2400 SealGel SLV Super Low Viscosity Acrylate Gel / Acrylic Gel for injection into very fine cracks.
