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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. How does the shape of the particles affect the strength in concretes of the same cementitious material content? A. Particle shape principally affects the w/cm by its effect on water demand and amount of paste required for workability of a given mixture. Also, the bond with the cement paste may be weakened due to the accumulation of bleed water under the relatively large surface areas of flat particles of aggregate. At the same w/cm, concrete with angular crushed stone aggregate ordinarily has a higher flexural strength than concrete with rounded gravel aggregate. References: SP-1(02); E-1(16); ACI 221R-96; ACI 213R-14; ACI PRC-211.1-22; ACI 211.4R-08; ASTM C33 Topics in Concrete: Aggregate; Concrete Fundamentals; Materials; Mixture Proportioning
Q. How does the shape of the particles affect the strength in concretes of the same cementitious material content?
A. Particle shape principally affects the w/cm by its effect on water demand and amount of paste required for workability of a given mixture. Also, the bond with the cement paste may be weakened due to the accumulation of bleed water under the relatively large surface areas of flat particles of aggregate. At the same w/cm, concrete with angular crushed stone aggregate ordinarily has a higher flexural strength than concrete with rounded gravel aggregate.
References: SP-1(02); E-1(16); ACI 221R-96; ACI 213R-14; ACI PRC-211.1-22; ACI 211.4R-08; ASTM C33
Topics in Concrete: Aggregate; Concrete Fundamentals; Materials; Mixture Proportioning
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