Ch4_Portland Cement Concrete

Ch4_Portland Cement Concrete - Fundamentals of Concrete...

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Unformatted text preview: Fundamentals of Concrete There is No such Animal as a Cement @$&!*^#% Composition of Concrete PC + Water + Aggregates (FA & CA) + Voids Properties of Fresh Concrete and Hardened Concrete Fresh Properties - ASTM Slump Temperature Density & Yield Air Content Time of Setting Hardened Properties - ASTM Strength Air Content Density, Absorption and Voids Volume Change Durability Permeability Strength Durability Freeze Thaw Chloride-Ion Alkali-Aggregate Sulfate How does Concrete Get Its Strength PC + water = hydration reaction > GLUE + Heat Cementitious material literally glues all of the inert (non-reactive) aggregates together to produce a solid load bearing mass that we call PCC Strength is inversely proportional to the water-to-cement ratio Strength vs. w/c Ratio for PCC Strength, psi w/c ratio Whats Important Good quality materials PC, water, coarse aggregate, and fine aggregate Proper Proportioning of the Materials Proper Mixing Placing and Finishing Proper Curing QC Testing Other Types of Concrete Lightweight Concrete Structural and Non-structural (120 50 pcf) High Density Concrete (400 pcf) Mass Concrete Pre-placed Concrete No Slump Concrete Roller-Compacted Concrete Shotcrete (Wet and Dry) PC does NOT come from Portland Oregon History Portland Cement Limestone + Sand + Clay + Iron ore + heat(1500 C) = PC Clinker + Grinding = PC powder Dry process and wet process (p. 22 and 23) Hydraulic Cement hardens in air and under water Types I, II, III, IV and V What does 1 bag of PC weigh? Cement kilns are HUGE ... A cement kiln is the word's largest moving manufacturing machine. Typically, they are a huge cylindrical furnace 12 to 25 feet in diameter and 450 to 1,000 feet in length. They are set on a slight incline and rotate from 1 to 4 RPM. Cement kilns can process up 200 tons of raw material such as limestone, clay, and sand each hour....
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This note was uploaded on 02/23/2012 for the course BCN 1210 taught by Professor Fobair during the Spring '09 term at University of Florida.

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Ch4_Portland Cement Concrete - Fundamentals of Concrete...

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