Technical Questions

Question: What is mass concrete?

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

Question: What are shrinkage-compensating expansive cement and concrete?

Question: Are polymer concrete and polymer-modified concrete used in repairs?

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

Question: Benefits of using slag cement

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

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

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

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

Question: Consolidation of concrete—required or not?

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

Question: Reinforced concrete vs. prestressed concrete

Question: Embedded metals other than reinforcing steel

Question: Maximum temperature limits for hot-weather concreting

Question: Why is Type IV cement rarely produced and Type V cement rarely used?

Question: What are blended cements?

Question: What is an expansive cement and what are the different types of expansive cement?

Question: Heat of hydration and the importance of controlling it

Question: Do we always need to repair cracked concrete?

Question: What is reinforced concrete?

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

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

Question: Acceptable concrete cracking

Question: Epoxy-coated reinforcement

Question: How is concrete placed?

Question: Are epoxy resins widely used in concrete construction and repair?

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

Question: The importance of reinforcement in concrete

Question: The importance of concrete cover

Question: Pozzolans in mass concrete

Question: How is concrete consolidated?

Question: Epoxy-coated reinforcement and cover depth against ground

Question: What nominal maximum sizes of aggregate are recommended?

Question: Curling, shrinkage, and w/cm

Question: Curing and curling of concrete slabs over vapor retarders

Question: Reinforcement termination in wastewater concrete containment

Question: Definition of portland cement

Question: Standard specifications for cements

Question: What does a pozzolan do in the concrete?

Question: Does the color or finish of fiber-reinforced concrete differ from regular concrete?

Question: Using and handling pozzolans

Question: The effect of aggregate shape on concrete strength

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

Question: Placement of welded wire reinforcement (WWR) in a slab-on-ground

Question: What are the primary benefits of using fiber-reinforced concrete compared to traditionally reinf...

Question: The earliest use of portland cement

Question: Effects of cement fineness on cement properties

Question: What is calcium-aluminate cement?

Question: How to Control Mass Concrete Temperature during Construction

Question: Resistance to cycles of freezing and thawing

Question: The effect of aggregate grading on concrete strength

Question: How is workability measured and specified?

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

Question: Minimum concrete cover for balconies with PT cables

Question: When should saw cuts be made on a concrete slab?

Question: Hardening of hydraulic cement

Question: Definition of “hot cement”

Question: What is a pozzolan?

Question: Importance of using pozzolans in hydraulic and environmental structures

Question: The effect of pozzolans on water demand

Question: The effect of pozzolans on shrinkage

Question: The effect of aggregate on concrete durability

Question: Why is consolidation needed?

Question: How can the effectiveness of curing be measured?

Question: How should samples of freshly mixed concrete be taken in the field to provide information on con...

Question: Temperature limits for mass concrete

Question: Characteristics of cement that affect compressive strength

Question: The effect of maximum size of aggregate on concrete strength

Question: Why is the workability of concrete important?

Question: What is shotcrete and when is it used?

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

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

Question: Material Requirements for Mass Concrete

Question: Why are fibers used in concrete?

Question: Factors affecting permeability

Question: Notable changes in modern portland cement properties

Question: The effect of pozzolans on freezing and thawing resistance

Question: Commonly used accelerating admixture

Question: The ultimate objective in proportioning concrete

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

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

Question: What methods are commonly used to ensure sufficient moisture for curing concrete?

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

Question: Tolerances for concrete slabs supporting steel tanks

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

Question: Why use fiber-reinforced concrete?

Question: Factors affecting time of setting

Question: The purpose of calcium sulfate (gypsum)

Question: Unsoundness in portland cement

Question: The effect of surface texture and cleanness on concrete strength

Question: Are retarding admixtures reliable as to the time of setting?

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

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: Popouts or popoffs?

Question: Using cube tests in lieu of cylinder tests

Question: Definition of setting time

Question: Factors governing the strength of concrete

Question: The making of portland cement

Question: Important requirements of a concrete aggregate

Question: What is an admixture?

Question: Precautions against sulfate attack

Question: Definition of controlled low-strength material (CLSM)

Question: What is curing?

Question: How much water goes into combination with the cement during the hardening of concrete?

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

Question: Mixture design and strength submittals

Question: Standard on detailing of concrete reinforcement

Question: Will fiber-reinforced concrete have a hairy appearance?

Question: Factors affecting cement properties

Question: Are pozzolans all alike?

Question: Do all fly ashes behave in a similar way?

Question: What is an air-entraining admixture?

Question: What are water-reducing admixtures?

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

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

Question: Shear reinforcement for beam-column connections

Question: Are all fibers used in concrete the same?

Question: What is the difference between synthetic microfibers and macrofibers?

Question: What is minimum reinforcement for crack-width control and how is design accomplished using fiber?

Question: Materials used to produce portland cement

Question: What is a natural pozzolan?

Question: What is aggregate?

Question: Why is combined aggregate grading used?

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

Question: Form release agents

Question: How do fibers work?

Question: What is silica fume?

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

Question: What is autogenous shrinkage?

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

Question: Simplified design for reinforced concrete buildings

Question: Where is fiber-reinforced concrete mostly used in practice?

Question: Do different admixtures of a given type always perform the same?

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

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

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

Question: Minimum Dimension of a Structure

Question: The difference between setting and hardening

Question: Protecting against excessive expansion due to alkali-aggregate reaction (AAR)

Question: The most important single factor affecting compressive strength

Question: Will concrete continue to increase in strength if there is no moisture present?

Question: How much does a bag of cement weigh?

Question: Joint deterioration mechanism and prevention

Question: Is personal protection needed when handling concrete?

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

Question: How is the resistance to sulfate determined?

Question: Shear Design Provisions in ACI 318-19

Question: Measurement of setting time

Question: What are the essential requirements of consistency?

Question: How is the air content of hardened concrete determined?

Question: False and flash set

Question: Chloride concentration in soil and exposure classes

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

Question: The cause of false set