Technical Questions

Question: What does ACI recommend regarding water-cement (w/c) ratios or admixtures to improve workability...

Question: What is involved in the process of mixture proportioning?

Question: The basic approach used in the ACI mixture proportioning method

Question: What tests are necessary or desirable in making a series of trial mixtures to arrive at a suitab...

Question: Mixture design and strength submittals

Question: What is the basis of proportioning to ensure concrete of the desired weather resistance?

Question: The ultimate objective in proportioning concrete

Question: How is the selection of mixture proportions affected by the materials to be used and the placing...

Question: Can trial mixtures be made with full-size batches at the start of a job?

Question: Air content common limits

Question: Consolidation of concrete—required or not?

Question: Air tests for non-air-entrained concrete

Question: The effect of entrained air on the workability of concrete

Question: How should the aggregates and other ingredients be measured to obtain uniformity in proportions?

Question: Aggregate blending

Question: The effect of aggregate grading on concrete strength

Question: What water-cementitious material ratio should be used for a particular job when strength require...

Question: What allowance should be made for strengths where air-entrained concrete is to be used?

Question: The effect of aggregate shape on concrete strength

Question: Why is the workability of concrete important?

Question: How is workability measured and specified?

Question: How do the requirements of placing affect the selection of proportions of aggregates and cementi...

Question: How is the water-cementitious material ratio (w/cm) expressed?

Question: Can you use any source of water as mixing water?

Question: Why is combined aggregate grading used?

Question: How does the relative amount of each ingredient used in concrete influence the properties of con...

Question: Are the proportions of ingredients inter-related to produce concrete of a given workability?

Question: What correction should be made for absorbed water and surface water carried by the aggregates?

Question: What consideration should be given to water that may be lost from concrete between the time it l...

Question: The effect of changes in proportions of the fine and coarse aggregate or the quantity of cementi...

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

Question: Are there data relating w/cm to flexural strength that are as reliable as those for compressive ...

Question: What range in slump is recommended for various types of construction?

Question: What is the difference between corrected and uncorrected weight in a concrete mix design?