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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Tools > Frequently Asked Questions
Q. Do some water-reducing admixtures induce bleeding? A. Yes, some do, and this may be beneficial in concrete for flatwork in a hot, arid climate by minimizing plastic shrinkage. Bleeding is the rise of the mixing water in newly placed concrete. Plastic shrinkage occurs when the rate of evaporation exceeds the rate of bleeding. Bleeding may reduce strength and increase permeability if the bleed water is worked into the surface. Bleed water lost by evaporation reduces the w/cm and raises the strength of concrete. References: SP-1(02); E4-12; ACI 212.3R-16; SP-288; ASTM C494; ASTM C1017 Topics in Concrete: Admixture; Concrete Fundamentals; Materials
Q. Do some water-reducing admixtures induce bleeding?
A. Yes, some do, and this may be beneficial in concrete for flatwork in a hot, arid climate by minimizing plastic shrinkage. Bleeding is the rise of the mixing water in newly placed concrete. Plastic shrinkage occurs when the rate of evaporation exceeds the rate of bleeding. Bleeding may reduce strength and increase permeability if the bleed water is worked into the surface. Bleed water lost by evaporation reduces the w/cm and raises the strength of concrete.
References: SP-1(02); E4-12; ACI 212.3R-16; SP-288; ASTM C494; ASTM C1017
Topics in Concrete: Admixture; Concrete Fundamentals; Materials
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