Calcium Aluminate Cement: Construction additives that are revolutionizing Sewer Rehabilitation

The versatility of calcium aluminate extends to its use in high-temperature refractory applications, building chemistry products, and chemical-resistant concretes, showcasing its multifunctionality in various industrial applications. The rehabilitation and extension of the lifespan of infrastructures can be achieved using Calcium Aluminate Cement (CAC) also known as aluminous cement or high-alumina cement (HAC). Sewer systems demand materials that can withstand harsh conditions and challenges posed by biogenic corrosion. Calcium Aluminate Cement has been recognized as a superior alternative to ordinary Portland Cement (OPC) for resisting severe environments.

 

The Superiority of CAC in Sewer Systems

Calcium aluminate coating (CAC) has proven its outstanding performance in addressing the challenges posed by biogenic corrosion, a common issue in sewer systems, and established itself as a preferred choice for large diameter sewer pipe linings and rehabilitation projects. Research has indicated that materials composed entirely of calcium aluminate, can effectively resist significant concrete corrosion, representing a significant improvement compared to traditional OPC materials.

Biogenic acid corrosion, which results from the hydrogen sulfide cycle in municipal wastewater environments, leads to the formation of sulfuric acid, which can aggressively corrode concrete and steel surfaces. CAC’s resistance to this process inhibits corrosion and the destruction of important infrastructure..

 

Advantages of Calcium Aluminate Cement

CAC offers resistance to acidic environments and boasts high early strength and abrasion resistance. It adheres well to damp concrete surfaces, which is particularly advantageous in live sewer conditions where moisture is a constant factor. The rapid strength gain and the ability to restore structural integrity make CAC a cost-effective and time-efficient solution for construction and rehabilitation projects​​.

 

Economic and Sustainable Implications

Despite being a higher cost per kg, the use of CAC proves to be economical in the long run due to the extended lifespan it affords to infrastructures. With sustainability being a pivotal concern in modern construction practices, the long-term cost savings, reduced maintenance, and enhanced durability of CAC contribute positively to the eco-friendly credentials of construction projects​​​​.

 

In conclusion, the distinctive properties of calcium aluminate cement have revolutionized the approach to constructing and rehabilitating sewer systems. Its ability to resist biogenic corrosion, bond to wet surfaces, and provide quick structural rehabilitation positions makes CAC an indispensable material in the construction industry.