0
Cement    Reported by: Marvida, Angelica F.Mendoza, Allen Dale A.     Submitted to:Arch. Sylvester D. Seño                ...
History/ Origin of Cement• 3000 BC—Egyptian  Pyramids     • The Egyptians were       using early forms of       concrete o...
History/ Origin of Cement• 300 BC - 476 AD—Roman  Architecture      • The ancient Romans used a        material that is re...
History/ Origin of Cement• 1824—Portland Cement  Invented     • Joseph Aspdin of England is       credited with the invent...
History/ Origin of Cement• 1836—Cement  Testing   • The first test of     tensile and     compressive     strength took pl...
History/ Origin of Cement• 1845 Isaac Johnson      • A few years later, in 1845, Isaac        Johnson made the first moder...
Portland cement•The type of cement used in almost allconcrete since 1824.•The original inventor, Joseph Aspdin, was aBriti...
Types of Cement• Type I     • General purpose cements where the special       properties of other types are not required. ...
Types of Cement• Type II     • Intended to have moderate sulfate resistance with       or without moderate heat of hydrati...
Types of Cement• Type III     • This cement is similar to Type I, but ground finer.     • Has relatively high early streng...
Types of Cement• Type IV    • Generally known for its low heat of hydration.    • This causes the heat given off by the hy...
Types of Cement• Type V    • Used where severe sulfate resistance is important.              • Extensive cracking         ...
Upcoming SlideShare
Loading in...5
×

Bt 1: Cement

1,313

Published on

Published in: Education, Business, Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,313
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
118
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Transcript of "Bt 1: Cement"

  1. 1. Cement Reported by: Marvida, Angelica F.Mendoza, Allen Dale A. Submitted to:Arch. Sylvester D. Seño Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  2. 2. History/ Origin of Cement• 3000 BC—Egyptian Pyramids • The Egyptians were using early forms of concrete over 5000 years ago to build pyramids. They mixed mud and straw to form bricks and used gypsum and lime to make mortars. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  3. 3. History/ Origin of Cement• 300 BC - 476 AD—Roman Architecture • The ancient Romans used a material that is remarkably close to modern cement to build many of their architectural marvels, such as the Colosseum, and the Pantheon. The Romans also used animal products in their cement as an early form of admixtures. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  4. 4. History/ Origin of Cement• 1824—Portland Cement Invented • Joseph Aspdin of England is credited with the invention of Portland cement. He named his cement Portland, after a rock quarry that produced very strong stone. • A ship carrying barrels of Aspdins cement sank off the Isle of Sheppey in Kent, England, and the barrels of set cement, minus the wooden staves, were later incorporated into a pub in Sheerness and are still there now. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  5. 5. History/ Origin of Cement• 1836—Cement Testing • The first test of tensile and compressive strength took place in Germany. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  6. 6. History/ Origin of Cement• 1845 Isaac Johnson • A few years later, in 1845, Isaac Johnson made the first modern Portland Cement by firing a mixture of chalk and clay at much higher temperatures, similar to those used today. At these temperatures (1400C- 1500C), clinkering occurs and minerals form which are very reactive and more strongly cementitious. • While Johnson used the same materials to make Portland cement as we use now, three important developments in the manufacturing process lead to modern Portland cement: - Development of rotary kiln - Addition of gypsum to control setting - Use of ball mills to grind clinker and raw materials Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  7. 7. Portland cement•The type of cement used in almost allconcrete since 1824.•The original inventor, Joseph Aspdin, was aBritish bricklayer and named his newinvention “Portland” because its colorreminded him of the color of the naturallimestone on the Isle of Portland which is apeninsula in the English Channel.•All Portland cements are hydraulic cement(hydraulic calcium silicates).•Hydraulic cement is actually the generic termin the construction industry. It refers to anycement that will set and harden after it iscombined with water. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  8. 8. Types of Cement• Type I • General purpose cements where the special properties of other types are not required. • It is commonly used for general construction especially when making precast and precast- prestressed concrete that is not to be in contact with soils or ground water. • Its uses include pavements and sidewalks, reinforced concrete buildings, bridges, railway structures, tanks, reservoirs, culverts, sewers, water pipes and masonry units. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  9. 9. Types of Cement• Type II • Intended to have moderate sulfate resistance with or without moderate heat of hydration. • This type is for general construction that is exposed to moderate sulfate attack and is meant for use when concrete is in contact with soils and ground water • Can be used in structures of considerable mass, such as large piers, heavy abutments, and heavy retaining walls. Its use will reduce temperature rise, an important quality when the concrete is placed in warm weather. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  10. 10. Types of Cement• Type III • This cement is similar to Type I, but ground finer. • Has relatively high early strength. • This gives the concrete using this type of cement a three day compressive strength equal to the seven day compressive strength of types I and II. Its seven day compressive strength is almost equal to types I and II 28 day compressive strengths. • The only downside is that the six month strength of type III is the same or slightly less than that of types I and II. Therefore the long-term strength is sacrificed a little. • It may also be used in emergency construction and repairs and construction of machine bases and gate installations. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  11. 11. Types of Cement• Type IV • Generally known for its low heat of hydration. • This causes the heat given off by the hydration reaction to develop at a slower rate. • As a consequence, the strength of the concrete develops slowly. • After one or two years the strength is higher than the other types after full curing. • This cement is used for very large concrete structures, such as dams, which have a low surface to volume ratio. Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  12. 12. Types of Cement• Type V • Used where severe sulfate resistance is important. • Extensive cracking • Expansion • Loss of bond between the cement paste and aggregate • Alteration of paste composition, with monosulfate phase converting to ettringite and, in later stages, gypsum formation. The necessary additional calcium is provided by the calcium hydroxide and calcium silicate hydrate in the cement paste Cement Reported by: Angelica F. Marvida and Allen Dale A. Mendoza BUILDING TECHNOLOGY-1/ 10:00-11:00 AM
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×