90507Lecture_5

90507Lecture_5 - Roman Aqueduct History… • England...

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Today 9/06/07 Graduate Reviews Quiz on Blackboard Save paper and time First Retreat Sadler 7/Flint 3/ Commuters Buses pull out at 8:15 AM
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Matter Atom Proton Neutron Electron Element Molecule Compound Polymers Macromolecules Isotopes, ions…….
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Periodic Table Organizes Atoms Atomic Number Atomic Mass Why is the Atomic mass a decimal?
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Weighted Averages Course grades… Isotopes….
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Three Laws that Govern Matter
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1 st Law Law of Conservation of Matter and Energy
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Law of Multiple Proportions CO • CO 2 CO 3 2-
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Law of Definite Composition
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Concrete Portland Cement Water Sand Gravel Other inert materials Aggregate
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Portland Cement “glue” 63% calcium oxide (CaO) • 20% silica (SiO 2 ) • 6% alumina (Al 2 O 3 ) • 3% iron(III) oxide (Fe 2 O 3 ) 8% other….
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Cement Preparation High-temperature mixing and processing of limestone. Hydration, then addition of aggregate to make a slurry.
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History…. Romans - Pozzalanic cements Limestone, volcanic ash and crushed clay Pantheon, the Pont du Gard and this
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Unformatted text preview: Roman Aqueduct History…. • England - Eddystone Lighthouse, 1756 – Smeaton, impure limestone with clay deposits • Portland cement - 1824 – Reached the US in 1871 Production • Clinkers – Impure CaCO 3 is heated at high temperatures to release CO 2 and H 2 O – Stony heavily burned materials – Calcium Oxide, Alumina and silica – Tricalcium silicate and dicalcium silicate Cement Degradation • Crumbling cement, rust stains, cracks • Corrosion by water – Porous (amount of water ∝ pore size) – Freeze-thaw cycling – Calcium hydroxide • Other corrosive chemical agents – Acid rain – CaOH --- CaCO 3 Spooky…cement • Fly ash – Coal power plants – Contains heavy metals - Hg – Low Cost – Does this Hg get released during the drying process? • Yes! (65-110 kg/year worldwide) • Small amount but at what cost to the environment? • Stay Tuned!!!...
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This note was uploaded on 09/28/2008 for the course FCH 150 taught by Professor Donaghy during the Fall '08 term at Syracuse.

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90507Lecture_5 - Roman Aqueduct History… • England...

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