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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
Question: Specialty admixtures
Question: How are the relatively small dosages of an admixture measured reliably and placed in the mixer?
Question: Are retarding admixtures reliable as to the time of setting?
Question: How can it be determined that an admixture will serve its intended purpose?
Question: What are set-controlling admixtures?
Question: The effect of water-reducing admixtures on drying shrinkage
Question: What is an admixture?
Question: Do different admixtures of a given type always perform the same?
Question: What is an air-entraining admixture?
Question: What are water-reducing admixtures?
Question: Would adding more cement serve the purpose of admixtures?
Question: Commonly used accelerating admixture
Question: Do some water-reducing admixtures induce bleeding?
Question: Air content common limits
Question: Air tests for non-air-entrained concrete
Question: Definition of concrete, hydraulic cement, mortar, and grout
Question: The effect of entrained air on the workability of concrete
Question: Factors affecting time of setting
Question: Resistance to cycles of freezing and thawing
Question: What factors affect the mixing time?
Question: When is the slump test useful in detecting changes in the concrete?
Question: Curling, shrinkage, and w/cm
Question: Using cube tests in lieu of cylinder tests
Question: Maximum temperature limits for hot-weather concreting
Question: Consistency, plastic consistency, and workability
Question: Heat of hydration and the importance of controlling it
Question: The effect of air content on concrete strength
Question: Epoxy-coated reinforcement
Question: The purpose of calcium sulfate (gypsum)
Question: The effect of pozzolans on water demand
Question: What fibers are used in concrete?
Question: How is workability measured and specified?
Question: Protecting concrete from cycles of freezing and thawing
Question: How do the requirements of placing affect the selection of proportions of aggregates and cementi...
Question: How is the selection of mixture proportions affected by the materials to be used and the placing...
Question: How is the water-cementitious material ratio (w/cm) expressed?
Question: What allowance should be made for strengths where air-entrained concrete is to be used?
Question: What is the basis of proportioning to ensure concrete of the desired weather resistance?
Question: How should the aggregates and other ingredients be measured to obtain uniformity in proportions?
Question: What are the essential requirements of consistency?
Question: Why is consolidation needed?
Question: How does the temperature influence curing?
Question: What methods are used for protecting concrete against low temperatures?
Question: Are epoxy resins widely used in concrete construction and repair?
Question: When does the slump test provide a useful indication of workability?
Question: Mixture design and strength submittals
Question: How to Control Mass Concrete Temperature during Construction
Search other resources on the ACI website for answers to technical questions