Corrosion Resistance of 50 Years Concrete Exposed to Saline Areas

Abstract

The Hong Run petrochemical oil depot is located in a saline area in the north of Weifang, where the contents of chloride and sulfate in this area are very high. Due to the rigorous environmental conditions, concrete with 50 years durability and C40 strength grade was prepared. A kind of corrosion resistance concrete with high performance superfine mineral powder and high performance pumping agent was developed to adapt to the conditions in saline areas. The chloride-penetration resistance ability was investigated by the test of chloride ion rapid electric transport (ASTM C1202). The concrete compressive strength and mortar expansion rate under continuous immersion in four different corrosion solutions was studied. The results showed that the chloride-penetration grade is very low. The compressive strength is high and the mortar expansion rate lower than 0.1%.

Research on Impermeability of Underwater Non-Dispersible Concrete in Saline Soil

“…Due to the secondary hydration reaction between cement hydration products CH and active SiO2 and Al2O3 in slag powder, calcium silicate hydrate gel is generated. The binding and adsorption effect of concrete on Cl − is enhanced, the structure is denser, and its impermeability is improved [29]. Figure 8a,b show the microscopic morphology of underwater non-dispersible concrete in the compound salt environment at 360 d without slag powder and with 60% slag powder content.…”

“…Due to the secondary hydration reaction between cement hydration products CH and active SiO 2 and Al 2 O 3 in slag powder, calcium silicate hydrate gel is generated. The binding and adsorption effect of concrete on Cl − is enhanced, the structure is denser, and its impermeability is improved [29].…”