3501-4 - Hydraulic and Nonhydraulic Cements Hydraulic...

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1 Hydraulic and Nonhydraulic Cements Hydraulic cement - hardens by reacting with water to form a _______________ product. The presence of air is not required for the hardening process. Example : _______________ . Nonhydraulic cement - reacts with water to form a product which is _________ in water. The hydration product may then react with ___ to form a water-resistant product. Example : __________ . CaO + H 2 O Ca(OH) 2 hydrated lime Ca(OH) 2 + CO 2 CaCO 3 + H 2 O Invention of Portland Cement • Greeks and Romans had used a blend of lime and pozzolanic materials to produce a hydraulic cement. • Modern Portland cement was invented by ______ _______ , an English mason who obtained a patent for his product in 1824. • It was named Portland cement because the concrete it produced resembled the color of the natural limestone quarried on the ___________ , a peninsula in the English Channel.
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2 Location of Isle of Portland Isle of Portland Scotland England Northern Island Wales Isle of Portland Beach connecting Isle of Portland to England
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3 Modern Cement Plant
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5 Bags of Portland cement Portland cement transport in bulk Portland cement
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6 Physical Properties of Portland Cement • Particle Size: Finer than No. 200 sieve (75 μ m) Typical particle size distribution of a normal Portland cement: Size %Passing 75 μ m1 0 0 45 μ m8 8 30 μ m7 4 15 μ m4 6 7.5 μ m2 2 • Typical Specific Gravity : ______ • Typical Unit Weight: _________ • A commercial bag of Portland cement in the U.S. weighs 94 lbs. Chemical Composition of Portland Cement • Portland cement consists essentially of various compounds of calcium. • Results of chemical analysis are usually reported in terms of oxides of the elements present. The main oxides in Portland cement are: Oxides Abbreviation (1) CaO Calcium Oxide C (2) SiO 2 Silicon Oxide S (3) Al 2 O 3 Aluminum Oxide A (4) Fe 2 O 3 Iron Oxide F (5) MgO Magnesium Oxide M (6) SO 3 Sulfur Oxide Ŝ (7) H 2 O Water H Chemical Composition of Portland Cement (Cont’d) • The 4 main compounds, which make up over 90% by weight of the Portland cement are: Compound Abbreviation 3CaO·SiO 2 Tricalcium Silicate ______ 2CaO·SiO 2 Dicalcium Silicate ______ 3CaO·Al 2 O 3 Tricalcium Aluminate ______ 4CaO·Al 2 O 3 ·Fe 2 O 3 Tetracalcium Aluminoferrite ______
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3501-4 - Hydraulic and Nonhydraulic Cements Hydraulic...

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