COMPARATIVE STUDY OF DIFFERENT CHEMICAL ACCELERATORS ON EARLY AGE PROPERTIES OF CONCRETE
Abstract
This study investigated the comparative effects of different chemical accelerators on the early age properties of concrete. The accelerators examined include calcium chloride, sodium nitrate, and potassium nitrate, each applied at varying dosages (1.5%) to evaluate their influence on setting time, workability, and compressive strength. Ordinary Portland Cement (OPC) was used in M15 mix ratio (1:2:4), and 150 mm concrete cubes were cast and cured under standard conditions. Testing was conducted at 3, 7, 14, and 28 days to assess early strength development and setting characteristics. The results revealed that calcium chloride produced the highest early strength gain but posed a significant risk of steel reinforcement corrosion due to its chloride content. Sodium nitrate and potassium nitrate offered moderate strength improvements while demonstrating better durability and workability, making them more suitable for reinforced concrete applications. The study concluded that while all tested accelerators enhance early-age performance, their selection should be based on structural requirements, environmental conditions, and long-term durability considerations. This research provides valuable insights for engineers and construction professionals in optimizing concrete mixes for faster setting and improved early strength without compromising long-term integrity.
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