Technical Questions

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

Question: What factors affect the mixing time?

Question: The effect of aggregate shape on concrete strength

Question: Why might fibers “ball up” in concrete mixes?

Question: Definition of concrete, hydraulic cement, mortar, and grout

Question: The effect of aggregate grading on concrete strength

Question: Popouts or popoffs?

Question: How can segregation of the concrete between the mixer and its final point of placement be prevented?

Question: How is concrete consolidated?

Question: Requirements for storing and handling aggregate

Question: What is an admixture?

Question: Consistency, plastic consistency, and workability

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

Question: Mixture design and strength submittals

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

Question: How can the surface or free water carried by the aggregates be determined?

Question: How to Control Mass Concrete Temperature during Construction

Question: What is the purpose of finishing and texturing concrete surfaces?

Question: How is the air content of freshly mixed concrete determined?

Question: Protecting concrete from cycles of freezing and thawing

Question: Curling, shrinkage, and w/cm

Question: Why is combined aggregate grading used?

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

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

Question: Why is a plastic consistency usually desirable for placing concrete?

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

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

Question: Size of test cylinder

Question: The ultimate objective in proportioning concrete

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

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

Question: When water and aggregate are heated, are any limitations necessary?

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

Question: Air content common limits

Question: Using cube tests in lieu of cylinder tests

Question: Factors affecting permeability

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

Question: When is the slump test useful in detecting changes in the concrete?

Question: How can the adequacy of mixing be determined?

Question: Factors governing the strength of concrete

Question: If the paste is ample in amount, but is too thin and watery to float the aggregate particles, wh...

Question: What is D-cracking?

Question: Aggregate blending

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

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

Question: Hardening of hydraulic cement

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

Question: Why is the slump test not an absolute measure of consistency or workability?

Question: Measurement of setting time

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