BC Ch. 12 Terms

Questions and Answers

What is aggregate used for in concrete construction?

To make concrete by adding materials like sand and gravel to a cement mixture (correct)

To add weight to concrete

To provide insulation

To reinforce concrete beams

What are cables in concrete construction?

Insulating materials

Special high-strength, cold-drawn steel strands used to apply tension to concrete (correct)

Decorative elements

Prefabricated concrete panels

What does the casting process in concrete construction involve?

Installing insulation panels

Cutting wood for formwork

Melting metal for steel beams

Placing fluid concrete into molds to harden into a specific shape (correct)

What is cast-in-place concrete?

Concrete that is molded in the location where it is expected to remain Signup and view all the answers

What is the purpose of chairs in concrete construction?

Small devices designed to keep reinforcing rods off the form surface so concrete flows underneath Signup and view all the answers

What is a primary characteristic of composite and combination columns?

They consist of multiple materials to enhance structural properties. Signup and view all the answers

How does cable tension in concrete impact structural integrity?

It allows for the use of smaller columns by distributing stress. Signup and view all the answers

Which of the following is NOT a function of aggregate in concrete?

To enhance thermal insulation Signup and view all the answers

What does a two-way structural system involve?

Floors with beams running in two directions Signup and view all the answers

What differentiates plain concrete from reinforced concrete?

Plain concrete may include light reinforcement for temperature changes Signup and view all the answers

What is the primary characteristic of precast concrete?

Concrete that has been cast at a location other than where it is to remain Signup and view all the answers

In concrete construction, what does prestressing achieve?

It applies engineered stresses to offset future loads Signup and view all the answers

What function do reinforcing bars or rods serve in concrete construction?

They enhance concrete strength by providing additional reinforcement Signup and view all the answers

What is the role of temperature rods in concrete?

To help resist cracking caused by temperature changes Signup and view all the answers

What describes the process of slipforming in concrete construction?

Forms moving upward during the pouring of concrete Signup and view all the answers

What is spalling in relation to concrete structures?

The loss of surface material due to heat exposure Signup and view all the answers

What are strands used for in concrete construction?

To apply tension to concrete Signup and view all the answers

What is reshoring in concrete construction?

Temporary supports reinstalled after form removal to assist curing concrete Signup and view all the answers

What characterizes the two-way structural system compared to the one-way system?

It consists of beams in two perpendicular directions Signup and view all the answers

What defines Underwriters blocks in construction?

Blocks that meet Underwriters Laboratories (UL) standards Signup and view all the answers

What do pretensioning and posttensioning techniques utilize?

Tensioned steel tendons or rods to compress concrete Signup and view all the answers

What is the intended outcome of stressing the tendons in concrete construction?

To stretch steel tendons and secure them as the concrete sets Signup and view all the answers

What type of columns combines steel and concrete into one unit?

Columns that use steel and concrete combined into one unit Signup and view all the answers

What defines composite construction?

Buildings in which different load-bearing materials are used in different areas Signup and view all the answers

What does continuous casting involve in concrete construction?

Pouring concrete without interruption from start to finish Signup and view all the answers

How is continuous slipforming characterized?

Pouring concrete continuously as forms move upward Signup and view all the answers

What is the primary purpose of a drop panel in concrete construction?

A thicker section of floor on top of columns to resist the floor’s natural tendency to shear off Signup and view all the answers

What is the function of an excess flow valve?

Senses a sudden increased flow, as from a broken line, and shuts off flammable gas Signup and view all the answers

What is falsework in construction?

Temporary shoring, formwork, beams, or lateral bracing to support concrete work Signup and view all the answers

What sets apart a flat plate structural system?

A cast-in-place floor with no beams supported by columns; the floor plate rests directly on columns Signup and view all the answers

What role does a footing serve in construction?

To transfer the loads of walls, piers, or columns to the ground Signup and view all the answers

What is the primary use of formwork in concrete construction?

A mold that shapes the concrete Signup and view all the answers

What function does hollow tile serve in construction?

Tile unit composed of vertical hollow cells used to lighten concrete floors Signup and view all the answers

What defines Lally columns?

Steel pipes filled with concrete to increase load-carrying capacity Signup and view all the answers

What is a left-in-place form?

Concrete floors cast onto corrugated steel Signup and view all the answers

What is the lift slab construction method?

Concrete slabs are cast on the ground and lifted into place Signup and view all the answers

What does monolithic construction involve?

All concrete in a building is properly bonded together and acts as one Signup and view all the answers

What are mudsills primarily used for in construction?

Planks on which formwork shores rest Signup and view all the answers

What is the purpose of a mushroom cap in concrete construction?

Tapered extension at the tops of columns that assists in the transfer of loads from floor to column Signup and view all the answers

Study Notes

Aggregate

Used in concrete construction to create a mixture by adding materials like sand and gravel to cement.

Cables

High-strength, cold-drawn steel strands that apply tension to concrete, crucial for structural integrity.

Casting

Involves placing fluid concrete into molds, allowing it to harden into specific shapes essential for construction components.

Cast-in-Place Concrete

Molded directly on-site where it is intended to remain, allowing for custom shapes and integration with structural elements.

Chairs

Small devices that support reinforcing rods above form surfaces, ensuring concrete flows underneath them for better reinforcement.

Composite and Combination Columns

Constructed using a combination of steel and concrete, improving load-bearing capabilities and overall strength.

Composite Construction

Involves using various load-bearing materials in different areas of a building, optimizing structural performance.

Continuous Casting

The process of pouring concrete without interruption, crucial for large-scale projects requiring uniformity and strength.

Continuous Slipforming

A technique where concrete is poured continuously as forms move upward, allowing for rapid vertical construction.

Drop Panel

A structural feature that adds thickness to floor sections above columns, helping resist shearing forces.

Excess Flow Valve

A safety device that detects sudden increases in flow, such as in a broken line, shutting off flammable gas to prevent hazards.

Falsework

Temporary structures used to support concrete work until it can support itself, vital for safe construction practices.

Flat Plate Structural System

A design with a cast-in-place floor that relies solely on columns for support, eliminating the need for beams.

Footing

Transfers the loads from walls, piers, or columns to the ground, providing a stable foundation critical for building safety.

Formwork

A mold used in concrete construction to shape poured concrete, necessary for creating distinct structures.

Hollow Tile

Composed of vertical hollow cells designed to lighten concrete floors, enhancing structural efficiency.

Lally Columns

Steel pipes filled with concrete to bolster load-bearing capacity, often used in basements and open spaces.

Left-in-Place Form

Concrete floors generated by casting onto corrugated steel, providing structural support and integration.

Lift Slab

Construction method where concrete slabs are cast on the ground and subsequently lifted into place for building structures.

Monolithic Construction

Involves creating a structure from concrete that is bonded together, acting as a single unit for enhanced durability.

Mudsills

Planks serving as a foundation for formwork shores, crucial for maintaining stability during the concrete setting process.

Mushroom Cap

A tapered extension on column tops assisting in load transfer from floors to columns, which enhances structural effectiveness.

One-Way Structural System

Features floors with beams running solely in one direction, simplifying design and construction processes.

Plain Concrete

Concrete with minimal or no reinforcement, used in applications where additional strength is not critical.

Precast Concrete

Concrete elements cast at a different location from the construction site, allowing for modular construction methods.

Prestressing

A technique of introducing engineered stresses into concrete to counteract stresses applied under load, improving resilience.

Pretensioning and Posttensioning

Methods of tensioning steel tendons either before or after pouring concrete, enhancing concrete’s strength and performance.

Reinforced Concrete

Concrete that includes steel reinforcement to withstand various forces, making it suitable for most structural applications.

Reinforcing Bars or Rods

Provide additional strength to concrete, essential for ensuring structural integrity under load.

Reshoring

The practice of re-adding shores after form removal to support still-curing concrete, maintaining structure integrity.

Skewbacks

Specifically shaped tiles designed to match and fit around steel beams, aiding in structural cohesion.

Slipforming

A dynamic pouring method where forms move upward with the concrete, allowing for efficient and continuous construction.

Spalling

The phenomenon of surface material loss in concrete due to excessive heat exposure, leading to structural weaknesses.

Strands

Utilize special high-strength, cold-drawn steel cables to provide tension in concrete, instrumental in maintaining structural integrity.

Stressing the Tendons

Involves stretching steel tendons and securing them once concrete achieves its designated strength, enhancing load-bearing capacity.

Temperature Rods

Located within concrete to mitigate cracking due to temperature fluctuations, crucial for long-term durability.

Tendons

High-strength, cold-drawn steel cables utilized to apply tension in concrete structures, improving overall stability.

Two-Way Structural System

Characterized by floors that have beams running in two directions, providing balanced support and strength.

Underwriters Blocks

Concrete blocks manufactured per Underwriters Laboratories, Inc. classifications, ensuring compliance with safety standards.

Waffle Concrete

A distinct structural system utilizing a pattern of closely spaced beams set at right angles, enhancing strength and reducing weight.

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Description

Test your knowledge on key terms used in concrete construction, such as aggregates and cables. This quiz comprises multiple-choice questions designed to enhance your understanding of materials and techniques essential in construction projects.