control tests for concrete
TRANSCRIPT
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Control Tests for Concrete
Ch. 16
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Project Specifications Characteristics of the mixture
Maximum size aggregate
Minimum cement content Characteristics of the cement, water
aggregates and admixtures
Characteristics of the plastic and/or hardened
concrete Temperature, slump, air content
Compressive and/or flexural strength
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Frequency of Testing FA Aggregate Moisture testing
Twice daily
1% change effects mix water requirement by 13pcy
Slump Test
First batch of concrete delivered each day
When consistency appears to vary
Strength cylinders are made
Temperature of concrete recorded
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ContAir content tests
Initial batch of concrete
When concrete test cylinders are made
Temperature of concrete recorded
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Cont Concrete strength testing for each class of
concrete placed
Not less than once per day Not less than once for each 150 cy of concrete
placed
Not less than once for each 5000 sq ft. of surfacearea for slabs and walls.
One 7-day, two 28-day cylinders are requiredfor each test and one or more holdspecimens.
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Moisture Content of
Aggregates Oven dry method
Microwave
Moisture meter
Electrical resistivity
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Plastic Concrete Sampling freshly mixed concrete
ASTM C 172
2 or more portions within a 15 minute window Consistency
Slump test ASTM C 143 Test to be completed in 2 minutes after obtaining
sample
K-slump tester
Kelly Ball
Vebe consistometer
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Cont Temperature measurement
ASTM C 1064
This test should be completed within 5 minutesafter obtaining the sample
Air content
ASTM C 231 pressure method
ASTM C 173 volumetric method
Test to be started within 5 minutes after obtainingsample
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Density and YieldASTM C 138
Unit weight of plastic concrete
Yield provides information concerningvolumetric quantity of concrete producedper batch
Y = total weight of components/unit weight
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Time of settingASTM C 403
Penetration resistance as a function of time
Initial set 500 psi (2-6 hours)
Final set 4000 psi (4-12 hours)
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Strength specimens ASTM C 31field molded specimens
ASTM C 192 laboratory specimens
6 x 12 for 1 inch or greater max size CA 4 x 8 for -inch or less
Beams are 6 x 6 x 30-inches
Field specimens cured in same manner asstructure
Lab specimens cured in sat. limewater ormoist room.
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Destructive Testing of
Hardened Concrete ASTM C 39 for test cylinders
Strength effected by L/D ratio
Condition of the ends of samples
Sulfur mortar caps vs unbonded neoprene caps Loading rate (20-50 psi/sec)
ASTM C-78 for flexural strength using third pointloading.
ASTM C-293 for flexural strength using center pointloading.
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Strength Tests of Hardened
Concrete Compressive Strength Testing of Concrete,
ASTM C39
Unbonded neoprene caps, ASTM C1231 Flexural Strength - 3rd Point Method, ASTM
C78
Flexural Strength - Center Point Loading,ASTM C293
Splitting Tensile Strength of Concrete. ASTMC496
fr = 7.5*(fc)1/2
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Failure Modes of Compression
Testing
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Flexure Strength Testing -
Third Point Loading
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Flexure Strength Testing -Center Point Loading
P
L = span
depth
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Splitting Tensile Test
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Air Content
Petrographic Determination ofAir-VoidSystem, ASTM C457
hardened concrete air-void system
void size and air-void distribution system
freeze/thaw durability
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Density(Gs), Absorption andVoids
ASTM C642
Density or Unit Weight of HardenedConcrete
Absorption of Hardened Concrete
Volume of Voids in Hardened Concrete
Density of Hardened Concrete byNuclear Density Gage
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Other Tests
Determination of Chloride Ion Contentin Hardened Concrete ASTM C1152
ASTM C1218
Volume and Length Change
Shrinkage of Hardened ConcreteASTM C157
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Durability Frost Resistance
ASTM C666
Freezing in air and thawing in water
Freezing in water and thawing in water Dynamic modulus of elasticity
Sulfate Resistance
ASTM C1012
Corrosion Resistance
ASTM C876 - Potentiometric Mapping
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Corrosion Determination -Potentiometric Mapping
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Cont
Abrasion Resistance
ASTM C779
ASTM C944 ASTM C1138 (underwater test)
Carbonation
Phenolphthalein indicator method
Permeability
ASTM C1202 Rapid Chloride Permeability Test
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Nondestructive Test Methods
Rebound Hammer Tests
Schmidt Hammer
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http://www.corvib.com/concrete/schmidt.htm
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NDT
Penetration Testing- Windsor Probe
Maturity Testing In-place Compressive Strength
Pullout Tests
In-place Shear Strength
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NDT
Ultrasonic Pulse Velocity
Dynamic modulus of elasticity
Cracking
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Pulse Velocity Testing
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NDT
Other Dynamic Tests
Impact echo
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Impact Echo Testing