Rebar and Concrete Technology Review

A comprehensive set of vocabulary flashcards covering reinforcing steel grades, concrete components, cement types, and testing methods based on the lecture notes.

Rebar

Reinforcing steel bars composed of mild steel or high-yield steel used to resist tensile strength in structures.

Grade 33

A structural grade of reinforcing steel used for low rise buildings and conditions.

Grade 40

An intermediate grade of reinforcing steel used for medium-rise structures and infrastructure work.

Grade 60

A high-tensile grade of reinforcing steel used for high-rise structures and infrastructure.

PNS

Philippine national standard.

ASTM

American Society for Testing Materials.

W (Rebar Marking)

A marking on PNS Grade 415 rebar that denotes weldable property or low alloy steel depending on the identification section.

Ductility

A property important for ensuring structures have ductile rather than brittle behavior, influencing strength design and economy.

Modulus of Elasticity

The ratio of tensile stress to tensile strain, valued at $200\,GPa$ or $290,000,000\,psi$.

Carbon Steel

Also known as Mild steel, it is the most commonly used type of steel in buildings due to its strength and durability.

Footing

A foundation unit constructed under the base of a wall or column to distribute the load over a large area.

Stirrups

Closed loops of reinforcement bars used to hold main reinforcement bars together and provide lateral support against buckling in columns.

Concrete

A versatile construction material consisting of a semi-solid mixture of binding materials, aggregates (sand, gravel), and water.

Compressive Strength

An indication of the capacity of concrete to resist loads in structural applications, where $1\,MPa = 145.038\,psi$.

Type 1 Portland Cement

Ordinary Portland Cement used for general concrete construction.

Type 2 Portland Cement

Moderate Heat of Hydration Portland Cement used for piers, dams, bored piles, and massive pours.

Type 3 Portland Cement

High early strength Portland Cement used when rapid strength development and early stripping of forms are required.

Type 4 Portland Cement

Low Heat of Hydration Cement used for gravity dams and reservoirs.

Type 5 Portland Cement

Sulfate Resistant Portland Cement used for underwater structures.

Sugar (in concrete)

A retarder that delays setting and increases workability.

Salt (in concrete)

An accelerator that promotes early strength, often used in cold weather.

Admixtures

Substances that allow the use of a very low water-cement ratio without affecting workability.

Vibrator

A tool used for concrete consolidation that should be inserted fast and withdrawn slowly at a rate of at least $1"$ per second.

Epoxy Resin Binder

A two-component epoxy bonding system used as a primer or to produce epoxy concrete and mortars.

Epoxy Concrete

A combination of epoxy resin binder and fine or coarse aggregate used to repair spalling along joints, cracks, or surface spalls.

SSC

Self compacting concrete.

HPC

High performance Concrete with a strength of more than $40\,MPa$.

Slump Test

A laboratory or site test used to measure the consistency and uniformity of concrete batches, in use since 1922.

True Slump

The desired test result where the general mass of the concrete drops evenly without disintegration.

Shear Slump

An indication that concrete lacks cohesion, characterized by one side of the concrete shearing or falling away.

Collapse Slump

An indication that the concrete mix is too wet, where the concrete completely collapses.

Zero Slump

A result where the concrete maintains the shape of the mold, indicating the mix is too stiff and has almost no workability.