Title: Calcium Nitrate-Based, Non-Corrosive, Non-Chloride Accelerator
Author(s): David Chin
Publication: Symposium Paper
Appears on pages(s): 49-78
Keywords: accelerating agents; calcium nitrite; compressive strength; concretes; corrosion resistance; corrosion tests; setting (hardening); fly ash; Materials Research
Two important properties of calcium nitrite are that it is an accelerator and a corrosion inhibitor when used as an admixture in concrete. With its performance as an accelerator enhanced, calcium nitrite can be used as an effective non-corrosive, non-chloride accelerator in normal and fly ash concrete. The calcium nitrite-based accelerator provides good accelera-tion in initial setting times at 50°F (10°C) and 72°F (22°C) produces a significant improvement in compressive strengths at early ages. Electrochemical solution tests can be used to conduct a quick screening test to determine the potential corrosivity of a non-chloride accelerator. Potential and linear polarization resistance measurement tests provide a quick indication regarding the potential corrosivity of a non-chloride accelerator.