Concrete

Question 1

Portland Cement

Answer 1

Fine grey powder mixed into concrete to make it a cohesive solid.

Question 2

Clinker

Answer 2

Ground constituents burned. Gypsum is added to create portland cement.

Question 3

Aggregates

Answer 3

Course aggregate - gravel/crushed stone

Fine aggregate 0 sand

Question 4

Hydration

Answer 4

Cement combines chemically with water to form strong crystals that bind the concrete together.

Question 5

Curing

Answer 5

Hardening process of concrete

Question 6

Air-Entraining

Answer 6

Air introduced into concrete mixture to make it flow better. Compromises strength.

Question 7

Admixtures

Answer 7

Additions added to a concrete mixture to change the properties (add air, reduce water, etc…)

Question 8

Slump Test

Answer 8

Test water content of concrete on site.

Question 9

W-C Ratio

Answer 9

Water to cement ratio.

Question 10

Formwork

Answer 10

Creates the shape of concrete structures and acts as support until the concrete cures.

Question 11

Form Ties

Answer 11

Steel rod with fasteners to hold together two pieces of formwork.

Question 12

Reinforcing Bars

Answer 12

Rebars. Used to resist tension forces in concrete.

Question 13

Stirrup

Answer 13

Vertical steel bars that support horizontal rebars.

Question 14

Post - Tensioning

Answer 14

Concrete not allowed to bond to steel during curing. Strands tensioned after hydraulic jack and anchored.

Question 15

Pretensioning

Answer 15

Precast concrete… High-strength steel strands are stretched tightly between abutments in a precasting plant before concrete is cast. Concrete goes into compression and takes on a camber.

Question 16

Camber

Answer 16

A slight, intentional initial curvature in a beam or slab.

Question 17

One-way vs. Two Way Systems

Answer 17

One-Way System - Floor supported by single rows of beams in rectangular bays.
Two - Way System - Slab supported by square bays contained by beams that run in both directions.

Question 18

Ribbed Slab

Answer 18

One way slab that can span the longest distance by using the weight of the concrete to resist forces instead of steel.

Question 19

Waffle Slab

Answer 19

Plates or domes used to as formwork to create a longer span of Two-way joint.

Question 20

Mushroom Column

Answer 20

Structural column that flares at the top to resist forces.

Question 21

Slab Band

Answer 21

Beams that are several times as broad as they are deep. Used to support one-way solid slabs.

Question 22

Slab on grade

Answer 22

Level, solid concrete poured on the surface of the ground to support a structure.

Question 23

Float

Answer 23

A small platform suspended on ropes from a steel building frame to permit iron workers to work on connections.

Question 24

Flying Formwork

Answer 24

Fabricated in long sections that are supported by metal trusses. Sections moved from one floor to the next via crane.

Question 25

Tilt-Up Construction

Answer 25

Concrete panels poured on ground and hoisted into position.

Question 26

Flat Slab and Flat Place

Answer 26

What?