Technical Questions

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

Question: Embedded metals other than reinforcing steel

Question: Curing and curling of concrete slabs over vapor retarders

Question: What nominal maximum sizes of aggregate are recommended?

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

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

Question: Mixture design and strength submittals

Question: Curing Cylinders for Acceptance Testing

Question: Simplified design for reinforced concrete buildings

Question: Tolerances for floors supporting operable partitions

Question: Determining the cause of a crack

Question: Could a sulfate-resisting cement and slag cement be combined and used for concrete exposed to sulfates attack?

Question: Reinforced concrete vs. prestressed concrete

Question: Acceptable concrete cracking

Question: ACI code for evaluating existing buildings prior to repair

Question: Knowledge of concrete properties

Question: How is the required strength selected, measured, and obtained?

Question: Minimum concrete cover for balconies with PT cables

Question: Slabs-on-ground

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

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

Question: Two-way slabs design, ACI 318 vs. FEM

Question: Reinforcement termination in wastewater concrete containment

Question: Tolerances for concrete slabs supporting steel tanks

Question: Guidance on designing reinforced concrete retaining walls

Question: The intent of the 0.8 factor in Section of ACI 318-19

Question: Governing version of ACI 318

Question: Standard on detailing of concrete reinforcement

Question: Design of Slabs-on-ground

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

Question: Minimum thickness of bearing walls

Question: Design Properties of Lightweight Concrete

Question: Shear Design Provisions in ACI 318-19

Question: What is calcium-aluminate cement?

Question: Load factors used in the 1963 building code

Question: Painting the floor

Question: Chloride concentration in soil and exposure classes

Question: Are load tests on completed structures ever employed?

Question: Shear reinforcement for beam-column connections

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

Question: Punching shear check for shear wall foundations

Question: Substantial structural damage

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