Characteristics: - Positive displacement reversible self priming action. - Uniform Flow. - Simplicity. - Abrasion resistance. - Versatility. - Slow Speed. - High efficiency over wide performance range.
Following are the types of concrete admixtures:
- Air entraining concrete admixture.
- Water reducing admixture.
- Retarding concrete admixture.
- Accelerating concrete admixture.
- Calcium chloride.
Water can be added on site if some of the water from the mix design was held back during the initial mixing. The alternative of using a water-reducing admixture or superplasticizer to increase concrete slump should always be considered because adding to much water may weaken the concrete or cause cracking.