Technical Questions

Question: Embedded metals other than reinforcing steel

Question: Consolidation of concrete—required or not?

Question: Joint deterioration mechanism and prevention

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

Question: Heat of hydration and the importance of controlling it

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

Question: Standard specifications for cements

Question: Increasing the load capacity of a slab-on-ground using an overlay

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

Question: How should the concrete be consolidated to obtain a complete filling of the forms and around the...

Question: Definition of portland cement

Question: Does over-vibration cause segregation and loss of air content?

Question: What are the ultrasonic pulse velocity and the pulse echo tests?

Question: What is calcium-aluminate cement?

Question: Tolerances for floors supporting operable partitions

Question: How to Control Mass Concrete Temperature during Construction

Question: Chloride concentration in soil and exposure classes

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

Question: What other uses are there for the pulse velocity?

Question: How is workability measured and specified?

Question: How should the appropriate fiber be selected for a specific application, and how is fiber dosage...

Question: Low-strength cylinder test results

Question: Do some water-reducing admixtures induce bleeding?

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

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

Question: If the cementitious material paste is not sufficient in amount to float all of the aggregate par...

Question: Can the importance of proper consistency for placing be overemphasized?

Question: What methods of capping are recommended for compression specimens?

Question: What are rebound, penetration resistance, and pullout tests?

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

Question: Why is consolidation needed?

Question: How is concrete consolidated?

Question: What is mass concrete?

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

Question: How does the temperature influence curing?

Question: How can the effectiveness of curing be measured?

Question: Could a sulfate-resisting cement and slag cement be combined and used for concrete exposed to su...

Question: Curing Cylinders for Acceptance Testing

Question: Shear Design Provisions in ACI 318-19

Question: Requirements for durable concrete

Question: Definition of setting time

Question: The effect of water-cementitious ratio on permeability and shrinkage

Question: Difference between a contraction joint, isolation joint, expansion joint, construction joint, an...

Question: Reinforcement termination in wastewater concrete containment

Question: How do fibers affect the workability of concrete? Do fibers require additional water for placement?

Question: Does incorporating fiber as an alternative to traditional reinforcement enhance the environmenta...

Question: The effect of joints on the durability of concrete structures

Question: Requirements for storing and handling aggregate

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

Question: What is curing?

Question: Are any temperature limitations necessary in curing concrete in hot weather?

Question: Curling, shrinkage, and w/cm

Question: Popouts or popoffs?

Question: ACI code for evaluating existing buildings prior to repair

Question: Using cube tests in lieu of cylinder tests

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

Question: Estimating in-place concrete strength

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

Question: Hardening of hydraulic cement

Question: Knowledge of concrete properties

Question: Evaluating the properties of hardened concrete

Question: Can you have too much paste or mortar?

Question: What are the essential requirements of consistency?

Question: Can the heat liberated by the hydrating cement be relied on to give protection during cold weather?

Question: How are properties of concrete in the structure measured?

Question: What is architectural concrete?

Question: False and flash set

Question: Resistance to cycles of freezing and thawing

Question: Definition of “hot cement”

Question: What is slag cement or ground granulated blast-furnace slag (GGBFS)

Question: What does a pozzolan do in the concrete?

Question: What are high-density aggregates?

Question: What factors affect the mixing time?

Question: What methods are used for protecting concrete against low temperatures?

Question: When is steam curing used?

Question: Does additional curing improve the properties of concrete in other ways than in strength?

Question: Why are many non-destructive tests used as “estimators” of concrete strength?

Question: What is autogenous shrinkage?

Question: Minimum Dimension of a Structure

Question: Factors governing the strength of concrete

Question: Factors affecting permeability

Question: The importance of proper drainage

Question: Factors affecting cement properties

Question: Unsoundness in portland cement

Question: The cause of false set

Question: Benefits of using slag cement

Question: Would adding more cement serve the purpose of admixtures?

Question: Precautions against sulfate attack

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

Question: Are there any tests that may be made directly on the structure to determine if the concrete has ...

Question: Can fresh concrete be used around aluminum framing or in aluminum molds??

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

Question: What are the test methods used for evaluating fiber-reinforced concrete?

Question: Measurement of setting time

Question: Effects of cement fineness on cement properties

Question: Advantages of low-density aggregate

Question: How is the temperature of concrete measured?

Question: How is the permeability of concrete determined?

Question: What is D-cracking?

Question: Design Properties of Lightweight Concrete

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