Sulfate attack is a major durability issue for concrete structures. It occurs when sulfate ions (SO₄²⁻) from external sources — such as sulfate-rich soils, groundwater, seawater, industrial effluents, or sewage —penetrate the concrete and react with hydration products in the cement paste.
Why Sulfate Resistance is Important
Sulfate attack causes expansion that leads to premature degradation, cracking, spalling, and strength loss, costly repairs, reduced service life, or structural failure. In regions with high sulfate soils or groundwater (e.g., parts of the western US, coastal areas, or certain industrial sites), ignoring sulfate resistance can result in significant economic and safety issues.
Sulfate resistance testing evaluates how well concrete withstands this kind of deterioration. Proper sulfate-resistant concrete extends service life and reduces maintenance. It’s often achieved by using supplementary cementitious materials (SCMs) like fly ash or slag.
Aeternum Offers Superior Sulfate Resistance
Using Aeternum as the binder inherently maximizes the ability of concrete to endure sulfate-rich environments:
Using the standard ASTM C1012 test to contrast concrete made with Aeternum versus concrete made with OPC showed that the OPC-based sample showed an expansion of approximately 0.045% over about 25 weeks, very close to the expansion limit of 0.05%. The Aeternum-based concrete showed an expansion of only about 0.018% after over 78 weeks of exposure.
