Mechanical Properties and Corrosion Resistance of Cement Concrete Containing Sea Sand or Sea Water

Mechanical Properties and Corrosion Resistance of Cement Concrete Containing Sea Sand or Sea Water

Through the test of 27 groups of specimens, the influence law on compressive strength and expansion under sea salt corrosion by type of cement, fly ash substitute rate of cement, fly ash substitute rate of fine aggregate, water-binder ratio, type of fine aggregate, and immersion method were analyzed. The corrosion resistance of reinforced concrete under sea water attack was also studied in this research. The experimental results indicate that the influence of various factors on the compressive strength is correlative, and the interaction effects of the type of cement and type of fine aggregate, type of cement and immersion method on the compressive strength are correlative; fly ash substitute rate of fine aggregate, water-binder ratio, type of fine aggregate and immersion were all had significant effects on the expansion at each age. The immersion method had the most significant effect on the expansion. The type of fine aggregate has a significant effect on all tests, but other more correlative factors can be used to improve the deterioration of cement mortar caused by sea sand. Replacement of 10% or 20% aggregate by fly ash gives no apparent improvement in preventing the expansion of cement mortar in sea water exposure. The concrete test results indicate that no serious detrimental effect was found for the corrosion inhibitor in reinforced concrete.