CONCRETE quiz no. 1

Tricalcium silicate

A compound constituting about half the volume of portland cement and responsible for the hardening or early gain in strength of the cement.

Dicalcium silicate

A compound constituting about one quarter of the volume of portland cement and responsible for the aging or long term gain in strength of the cement.

Tricalcium aluminate

A compound constituting about one tenth of the volume of portland cement and responsible for the initial setting of the cement.

Bull float

A long-handled tool used for the initial floating of a freshly poured concrete slab.

Type II: Moderate

A portland cement having a reduced content of Tricalcium aluminate, making it more resistant to sulfates and causing it to generate less heat of hydration; used in general construction where resistance to moderate sulfate action is required or where heat buildup can be damaging, as in the construction of large piers and heavy retaining walls.

Type V : sulfate resisting

A portland cement having a reduced content of tricalcium aluminate, lessening the need for gypsum, a sulfate normally added to cement to retard its setting time ; used where resistance to severe sulfate action is required.

Type IV: low heat

A portland cement having a reduced content of tricalcium silicate and an increased content of dicalcium silicate, causing it to generate less heat of hydration than normal portland cement; used in the construction of massive concrete structures, such as gravity dams, where a large buildup in heat can be damaging.

Type I: Normal

A portland cement used for general construction, having none of the distinguishing qualities of the other types.

Dowel

A steel reinforcing bar that projects from a foundation to tie it to a column or wall, or from section of a concrete slab or wall to another.

Darby

A stiff straightedge of wood or metal straightedge for smoothing a fresh concrete surface immediately after screeding

Screed

A stiff straightedge of wood or metal that establishes the level the surface to which concrete will be placed

Type III: high early strength

A very finely ground portland cement having an increased content of tricalcium silicate, causing it to cure faster and gain strength earlier than normal portland cement; used when the early removal of formwork is desired, or in cold-weather construction to reduce the time required for protection from low temperatures.

Trowel

Any various flat-bladed hand tools for applying, spreading, working, or smoothing plastic material such as concrete, mortar and plaster

Beton Brut

Architectural concrete left unfinished or roughly finished after pouring and intentionally left exposed visually.

masonry mortar

Cement + water + sand + lime

Cement Mortar

Cement + water +sand

stucco

Concrete that is exposed as an interior or exterior surface in the completed structure

Cast-in-place

Concrete that is poured in its final location.

Retarding Admixtures

If concrete pouring is stopped and to resume the next day, what kind of admixture is used to address the problem?

Release Agent

In concrete terminology, an agent is a general term for a material that may be used either as an addition to cement or as an admixture in concrete. Form oil is an example of?

Reshoring

Inserting temporary supports under concrete beams and slabs after the formwork has been removed, to prevent overloading prior to full curing of the concrete

Clinker

Manufacturing cement involves a process starting from raw materials and ending as fine powder. Raw materials are crushed, ground, proportioned and blended, then passed through high temperature rotating kiln to produced this intermediate material, which finally ground further and combined with gypsum, produces the cement powder

Shear

Stirrups are placed in concrete beam reinforcement to resist _______?

Weight

The correct proportioning of ingredients for the mixture of concrete is done by

Workability

The primary purpose of a slump test is to meet which of the following concrete quality is requirements?

shoring

Using pieces of timber, usually in a diagonal position, to hold a wall in place temporarily.

Ribbed Slab

What is this?

Tendon

a steel strand used for prestressing a concrete member.

Formworks

a system of temporary boarding, sheathing or pans used to produce the desired shape and size of concrete mass

Stirrups

a vertical loop of steel bar used to reinforced a concrete beam against diagonal tension forces.

Float

any flat tool for spreading and smoothing a fresh concrete, stucco, or plaster surface

Cement Paste

cement + water

Concrete

cement + water + sand + coarse aggregate

Vermiculite

heat-treated mica that is lightweight and has high nutrient and moisture holding content

Flat plate

is not a one-way sitecast concrete framing system

aggregate

the inherent strength of concrete depends on the quality of its?

Honey Comb

voids on a formed concrete surface caused by segregation during placement or by insufficient consolidation

Consistency

with regards to concrete proportioning , which of the following characteristics is of utmost concern if mass concrete is produced?