Air - Entrainer

• Formation of small srtable discrete bubbles 
• Improved workability ( higher slump ) 
• Increase resistance to frost action 
•  Reduction in bleeding and water gain 
• Use for road and runway construction 
• Adverse effect : some reducrtion in strength 
• The incorporation of void space within concrete decreases its crushing strength by 6% for every 1 % of air-entrained > However , itg is partially offset by using lower water content