Technical Questions

ACI Committees, Membership, and Staff have answered common questions on a variety of concrete related topics.

Question: Size of test cylinder

Question: Estimating in-place concrete strength

Question: Low-strength cylinder test results

Question: Resistance to cycles of freezing and thawing

Question: The effect of air content on concrete strength

Question: The effect of changes in proportions of the fine and coarse aggregate or the quantity of cementitious material on the strength

Question: Mixture design and strength submittals

Question: Air tests for non-air-entrained concrete

Question: Using cube tests in lieu of cylinder tests

Question: Factors governing the strength of concrete

Question: How are the relatively small dosages of an admixture measured reliably and placed in the mixer?

Question: Is the cutting of cores or other shaped specimens directly from a completed structure ever used for determining the strength of the concrete?

Question: Using core strength to calculate compressive strength of an existing structure

Question: How can it be determined that an admixture will serve its intended purpose?

Question: Who selects the requirements for concrete for a project?

Question: Standards for 7-day and 28-day strength test results

Question: What is the intention of the ACI 318 Building Code?

Question: Requirements for a successful concrete structure

Question: The most important single factor affecting compressive strength

Question: If time is not available for preliminary tests, how can the desired strengths be ensured?

Question: Can tests be conducted by anyone?

Question: How do the code requirements get to the contractor?

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