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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. What correction should be made for absorbed water and surface water carried by the aggregates? A. With batch quantities determined by mass on saturated surface-dry aggregates, it is necessary to find the quantities of aggregate as delivered that will give the equivalent saturated surface-dry (SSD) materials. If the aggregates are drier than SSD, additional water needs to be added to the batch to fill the permeable pores in the aggregate. If they are wetter than SSD, the surface water is counted as part of the mixing water and reduced from the amount of water added to the batch. These corrections are essential to keep the w/cm constant. Changes in w/cm affect the properties of concrete. References: SP-1(02); ACI PRC-211.1-22; ACI 211.4R-08 Topics in Concrete: Aggregate; Concrete Fundamentals; Mixture Proportioning
Q. What correction should be made for absorbed water and surface water carried by the aggregates?
A. With batch quantities determined by mass on saturated surface-dry aggregates, it is necessary to find the quantities of aggregate as delivered that will give the equivalent saturated surface-dry (SSD) materials. If the aggregates are drier than SSD, additional water needs to be added to the batch to fill the permeable pores in the aggregate. If they are wetter than SSD, the surface water is counted as part of the mixing water and reduced from the amount of water added to the batch. These corrections are essential to keep the w/cm constant. Changes in w/cm affect the properties of concrete.
References: SP-1(02); ACI PRC-211.1-22; ACI 211.4R-08
Topics in Concrete: Aggregate; Concrete Fundamentals; Mixture Proportioning
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