Midterm exam ( Rebars And Formworks)

Question 1

It’s a steel bar or mesh of steel wires used in reinforced concrete and masonry structures to provide tensile strength and help distribute the load more effectively.

Answer 1

Rebar

Question 2

What are the type of rebars?

Answer 2

•carbon steel rebar
•stainless steel rebar
•galvanized rebars
•glass fiber reinforced polymer (GFRP) rebar
•epoxy coated rebar
•welded wire fabric (WWF) rebar
•expanded metal rebar

Question 3

It is one of the most commonly used manufacturing and construction materials in the world due to its strength, adaptability, and affordability.

Answer 3

Carbon steel rebar

Question 4

This rebar is a type of reinforcing bar made from stainless steel, a corrosion-resistant alloy that contains chromium, nickel, and other elements. This type of rebar is used in concrete structures where corrosion resistance is a primary concern, such as in marine environments, chemical processing plants, and structures subjected to de-icing salts.

Answer 4

Stainless steel rebar

Question 5

It have a zinc coating that provides corrosion resistance. They are often used in areas with exposure to moisture, such as in bridge decks and highway structures.

Answer 5

Galvanized rebars

Question 6

It’s a structural ribbed reinforcing bar made of high strength and corrosion resistant glass fibres that are impregnated and bound by an extremely durable polymeric epoxy resin.

Answer 6

Glass fiber reinforced polymer rebar

Question 7

This a type of reinforcing bar that is coated with an epoxy layer to protect against corrosion and increase durability. The epoxy coating acts as a barrier to prevent the steel from being exposed to corrosive elements

Answer 7

Epoxy coated rebar

Question 8

It is a prefabricated reinforcement consisting of parallel series of high strength cold drawn or cold rolled wire welded together in square or rectangular grids.

Answer 8

Welded wire fabric rebar

Question 9

It is commonly used where a considerable thickness of plaster is required, or to reinforce light concrete construction.

Answer 9

Expanded metal rebar

Question 10

It play a critical role in the strength and durability of concrete structures.

Answer 10

Rebar sizes

Question 11

The rebar sizes are determined by?

Answer 11

•engineering requirements
•load-bearing capacity
•specific project needs

Question 12

What are the common rebar sizes?

Answer 12

10mm
12mm
16mm
20mm
25mm
32mm

Question 13

Rebar replacement :

Answer 13

•SPACING AND COVER REQUIREMENTS
•LAP LENGTH
•SPACING BETWEEN PARALLEL BARS
•DEVELOPMENT LENGTH
•PLACEMENT TOLERANCES
•PROPER FIXING AND SUPPORT
•BENDING AND CUTTING

Question 14

What are the construction standards and codes?

Answer 14

•PHILIPPINE NATIONAL STANDARD (PNS 49)
•NATIONAL BUILDING CODE OF THE PHILIPPINES (NBCP)
•PHILIPPINE INSTITUTE OF CIVIL ENGINEERS (PICE) CODE OF ETHICS AND STANDARDS OF PROFESSIONAL PRACTICE
•LOCAL BUILDING CODES
•STRUCTURAL ENGINEERING CODES
•RELEVANT INTERNATIONAL STANDARDS

Question 15

It’s s a mould used to form concrete into structural shapes. Formwork can be made of timber, steel, plastic, or fiberglass.

Answer 15

Formworks

Question 16

Good formwork system:

Answer 16

1. Easy removal and economical
2. Less leakage and quality
3. Rigidity and smooth surface
4. Strength and support

Question 17

What are the type of formworks?

Answer 17

• timber formwork
• stainless steel formwork
• reusable plastic formwork
• permanent insulated formwork
• stay-in-place formwork
• flexible formwork

Question 18

It is a Traditional formwork system using timber or plywood sheets.

Answer 18

Timber formwork

Question 19

Suitable for simple structures and projects with budget constraints.

Answer 19

Timber formwork

Question 20

It is a Pre-engineered formwork systems that come with integrated components.

Answer 20

Stainless steel formwork

Question 21

Designed for specific applications and can be quickly assembled.

Answer 21

Stainless steel formwork

Question 22

It is made of lightweight and durable plastic. Designed for small to medium residential projects.

Answer 22

Re-usable plastic formwork

Question 23

A lightweight formwork (made from an insulating material) to support concrete walls whilst they are being cast in-situ and which is then left in place as insulation.

Answer 23

Permanent insulated formwork

Question 24

Used in the construction of load-bearing walls and foundations.

Answer 24

Stay-in-place formwork

Question 25

The formwork remains in place after the concrete cures, eliminating the need for removal.

Answer 25

Stay-in-place formwork

Question 26

Innovative formwork that uses fabric or textiles as a mold for shaping concrete.

Answer 26

Flexible formwork

Question 27

Suitable for creating unique, organic shapes in architecture.

Answer 27

Flexible formwork

Question 28

Components of a formwork:

Answer 28

BRACES
TIE
STUDS
SHEATHING
WALES
FOOTING
SIDE PLATE
BATTENS
CLEAT

Question 29

It’s a system of structural members used temporarily to support loads during construction. The forces arising from these loads must be fully resolved, using props or columns
to provide all the support needed for the work under construction such as beams. formwork but are not limited to onlv the above mentioned.

Answer 29

Propping and centring

Question 30

It’s a Formwork (Shuttering) acts as moulds for pouring concrete

Answer 30

Shuttering

Question 31

The formation of a sharp nice corner is practically difficult and the concrete at corners is easily chipped and broken into pieces during the removal of concrete formwork. Hence, the provision of chamber could protect the corner from chipping when striking formwork.

Answer 31

Provision of chamber

Question 32

Fourth step in formwork installation

Answer 32

Cleaning and surface treatment

Question 33

Allow the concrete to dry before removing the forms. You’ll want the concrete to be hard and strong so that removing the forms does not result in a sagging surface. Allow the concrete to cure overnight.