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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
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Question: How does the relative amount of each ingredient used in concrete influence the properties of concrete?
Question: Consolidation of concrete—required or not?
Question: The effect of entrained air on the workability of concrete
Question: What is involved in the process of mixture proportioning?
Question: How do the requirements of placing affect the selection of proportions of aggregates and cementitious material?
Question: Mixture design and strength submittals
Question: What is the basis of proportioning to ensure concrete of the desired weather resistance?
Question: The effect of aggregate shape on concrete strength
Question: Air tests for non-air-entrained concrete
Question: The effect of aggregate grading on concrete strength
Question: Are the proportions of ingredients inter-related to produce concrete of a given workability?
Question: The effect of changes in proportions of the fine and coarse aggregate or the quantity of cementitious material on the strength
Question: How is the selection of mixture proportions affected by the materials to be used and the placing requirements?
Question: What tests are necessary or desirable in making a series of trial mixtures to arrive at a suitable mixture for a particular job?
Question: Could a sulfate-resisting cement and slag cement be combined and used for concrete exposed to sulfates attack?
Question: The basic approach used in the ACI mixture proportioning method
Question: The ultimate objective in proportioning concrete
Question: Why is the workability of concrete important?
Question: How is workability measured and specified?
Question: Air content common limits
Question: What consideration should be given to water that may be lost from concrete between the time it leaves the mixer and its final consolidation in the form?
Question: Can trial mixtures be made with full-size batches at the start of a job?
Question: Why is combined aggregate grading used?
Question: What water-cementitious material ratio should be used for a particular job when strength requirements are to govern?
Question: What allowance should be made for strengths where air-entrained concrete is to be used?
Question: How should the aggregates and other ingredients be measured to obtain uniformity in proportions?
Question: If time is not available for preliminary tests, how can the desired strengths be ensured?
Question: What range in slump is recommended for various types of construction?
Question: Can you use any source of water as mixing water?
Question: Aggregate blending
Question: What correction should be made for absorbed water and surface water carried by the aggregates?
Question: How is the water-cementitious material ratio (w/cm) expressed?
Question: Are there data relating w/cm to flexural strength that are as reliable as those for compressive strength?
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