Construction materials concrete masonry
This presentation is the property of its rightful owner.
Sponsored Links
1 / 11

TED 316 – Structural Design PowerPoint PPT Presentation


  • 58 Views
  • Uploaded on
  • Presentation posted in: General

Construction Materials Concrete & Masonry. TED 316 – Structural Design. Been used since the Roman Empire Key event in the history of architecture Termed the Roman Architectural Revolution Similar to modern concrete and nearly as strong

Download Presentation

TED 316 – Structural Design

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Construction materials concrete masonry

Construction Materials

Concrete & Masonry

TED 316 – Structural Design


Concrete

Been used since the Roman Empire

Key event in the history of architecture

Termed the Roman Architectural Revolution

Similar to modern concrete and nearly as strong

Did not have reinforcing steel so could not resist tension

Often used as core with masonry cladding

Concrete


Concrete1

  • Man-made material

  • Composite consisting of:

    • Cement (commonly Portland Cenent)

    • Aggregate

      • Coarse – gravel or crushed rocks

      • Fine – usually sand

    • Water

    • Chemical admixtures

    • Mineral admixtures

    • Reinforcement

Concrete


Concrete2

Solidifies and hardens after mixing with water

Chemical process known as hydration

Exothermic reaction (gives off heat)

Tremendous compression strength

Poor tension strength

Wide range of uses

Most used man-made material on earth

Huge economic impact

Concrete


Concrete production

  • Processes vary with available technology

  • Mixing concrete

    • Thorough mixing essential

    • Traditional mixing

    • Separate paste mixing

  • Workability

    • Ability of a fresh mix to fill a form

    • Measured by the concrete slump test

Concrete Production


Concrete production1

  • Curing

    • Determines strength and hardness

    • Moist and controlled temperatures needed

    • Sets quickly to become rigid

    • First three days are most critical

    • Too rapid curing causes tensile stress and cracking

    • Ponding to control curing process

    • 90% of strength in about three weeks

    • Strengthening may continue for decades

Concrete production


Concrete properties

  • Compression strength – very high

  • Tensile strength – much lower

  • Need for reinforcement

  • Coefficient of thermal expansion – very low

  • Cracking

    • Shrinkage cracking

    • Tension cracking

  • Creep

Concrete properties


Concrete environmental and health issues

  • Carbon dioxide emissions

    • 2nd largest industry producer of CO2

    • Up to 5% of worldwide man-made emissions

    • Sources include:

      • Thermal decomposition of calcium carbonate produces lime and carbon dioxide

      • Large use of energy – primarily fossil fuels

Concrete environmental and health issues


Concrete environmental and health issues1

  • Surface coverage – 30-40% in large cities

  • Surface runoff

    • Soil erosion

    • Flooding

    • Urban runoff (oils, heavy metals, trash, etc.)

  • Urban heat

    • Light colored concrete reflects 50% more light than asphalt

    • Good in summer bad in winter

Concrete environmental and health issues


Concrete environmental and health issues2

  • Concrete Dust

    • Biggest concern during demolition or natural disasters

  • Toxic and radioactive contamination

  • Handling precautions

    • Skin contact with wet concrete = chemical burns

    • Protect eyes, hands and feet

    • Wash without delay

    • Gangrene type symptoms

Concrete environmental and health issues


Why use concrete

  • Durable building material

  • Superior fire resistance

  • Long service cycle

  • Good energy efficiency coefficient

    • Transportation to site

    • Construction process

    • Lifetime of project

  • Earthquake safety – if reinforced

Why use concrete


  • Login