Concrete fundamentals
Sponsored Links
This presentation is the property of its rightful owner.
1 / 15

Concrete: Fundamentals PowerPoint PPT Presentation


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

Concrete: Fundamentals. Prepared by: Marcia C. Belcher Construction Engineering Technology. Common Uses. Slabs (roadways, bridges, airstrips) Beams & Columns Parapets (highways) Piers (structures, bridges) Pipe Foundations (large and small) Retaining Structures (dams).

Download Presentation

Concrete: Fundamentals

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


Concrete: Fundamentals

Prepared by:

Marcia C. Belcher

Construction Engineering Technology


Common Uses

  • Slabs (roadways, bridges, airstrips)

  • Beams & Columns

  • Parapets (highways)

  • Piers (structures, bridges)

  • Pipe

  • Foundations (large and small)

  • Retaining Structures (dams)


Special Needs of Concrete

  • Exposure & use conditions require attention in mix design.

    • Marine environment

    • De-icing salt exposure

    • Freeze-thaw

    • Hi sulfate exposure

    • Early use of structure (bridge decks)

    • Very thick pours (homogenous pours like earth dams & parapets)

    • Very slender elements (pipe)


What Can We Do To Modify Concrete Design

  • Add plasticizers to increase workability

  • Use larger aggregates to increase strength

  • Reduce W/C ratio to increase strength

  • Use air entrainment to improve durability

  • Use pozzolans to improve chloride resistance

  • Use “accelerators” increase cure rate for hi early strength

  • Use set retarders or fly ash to decrease internal temperature & reduce shrinkage cracking


Portland Cement Types

  • The ingredients in the Portland cement can be modified to produce various properties.

  • These are called “Types”


Portland Cement Types – Type I

  • General Purpose

  • Most commonly used

  • No special curing, setting or resistance characteristics

  • Suitable where no special properties are required


Type II

  • Type II cement contains no more than 8% tricalcium aluminate (C3A) for moderate sulfate resistance.

  • Increases resistance to sulfate attack over Type I

  • Lower heat of hydration

  • Used for mass pours such as bridge piers

  • Used where ground water contains high sulfate levels


Type III – High Early Strength

  • Similar to Type I cements except it is ground finer

  • This increased hydration rate.

  • Results in rapid curing & higher early strengths.

  • Results in higher heat of hydration

  • Used in cold weather concreting

  • Used when early strength is required


Type IV

  • Hi levels of dicalcium silicate and tetracalcium aluminoferrite

  • Used in massive concrete structures where heat generated from hydration must be minimized.

  • Low heat of hydration = slow strength development

  • Used for mass pours such as dams where shrinkage problems may occur


Type IA, IIA, IIIA, IVA

  • “A” implies that air entraining is added to the portland cement


Cement Type Vs. Strength Gain


Temperature Vs. Cement Type


Effects of Moist Curing On Strength


Effects of Environmental Temperature on Strength Gain


W/C vs. Strength


  • Login