Aggregates for Concrete. Fine Aggregate n Sand and/or crushed stone n < 5 mm (0.2 in.) n F.A....
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Transcript of Aggregates for Concrete. Fine Aggregate n Sand and/or crushed stone n < 5 mm (0.2 in.) n F.A....
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Aggregates for Concrete
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Aggregates for Concrete
Fine Aggregate
Sand and/or crushed stone
< 5 mm (0.2 in.)
F.A. content usually 35% to 45% by mass or volume of total aggregate
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Aggregates for Concrete
Coarse Aggregate
Gravel and crushed stone
5 mm (0.2 in.) typically between
9.5 and 37.5 mm (3/8 and 1½ in.)
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
1. Minerals
2. Igneous rocks
3. Metamorphic rocks
4. Sedimentary rocks
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
Silica Quartz, Opal
Silicates Feldspar, Clay
Carbonate Calcite, Dolomite
1. Minerals
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
Sulfate Gypsum, Anhydrite
Iron sulfide Pyrite, Marcasite
Iron oxide Magnetite, Hematite
1. Minerals
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
Granite Syenite Diorite Gabbro Peridotite
Pegmatite Volcanic
glass Felsite Basalt
2. Igneous rocks
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
Conglomerate Sandstone Claystone, siltstone,
argillite, and shale Carbonates Chert
3. Sedimentary rocks
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Aggregates for Concrete
Rock and Mineral Constituents in Aggregates
Marble Metaquartzite Slate Phyllite Schist
4. Metamorphic rocks
Amphibolite Hornfels Gneiss Serpentinite
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Aggregates for Concrete
Normal-Weight Aggregate
Most common aggregates Sand Gravel Crushed stone
ASTM C 33
Produce normal-weight concrete 2200 to 2400 kg/m3 (140 to 150 lb/ft3)
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Aggregates for Concrete
Lightweight Aggregate (1)
Expanded Shale Clay Slate Slag
ASTM C 330
Produce structural lightweight concrete 1350 to 1850 kg/m3 (90 to 120 lb/ft3)
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Aggregates for Concrete
Lightweight Aggregate (2)
Pumice Scoria Perlite Vermiculite Diatomite
Produce lightweight insulating concrete— 250 to 1450 kg/m3 (15 to 90 lb/ft3)
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Aggregates for Concrete
Heavyweight Aggregate
Barite Limonite Magnetite Ilmenite Hematite Iron Steel punchings or shot
ASTM C 637, C 638 (Radiation Shielding)
Produce high-density concrete up to 6400 kg/m3 (400 lb/ft3)
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Aggregates for Concrete
Aggregate Characteristics and Tests (1)Characteristic
Test
Abrasion resistance
ASTM C 131 (AASHTO T 96), ASTM C 535, ASTM C 779
Freeze-thaw resistance
ASTM C 666 (AASHTO T 161), ASTM C 682, AASHTO T 103
Sulfate resistance ASTM C 88 (AASHTO T 104)
Particle shape and surface texture
ASTM C 295, ASTM D 3398
GradingASTM C 117 (AASHTO T 11), ASTM C 136 (AASHTO T 27)
Fine aggregate degradation
ASTM C 1137
Void content ASTM C 1252 (AASHTO T 304)
Bulk density ASTM C 29 (AASHTO T 19)
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Aggregates for Concrete
Aggregate Characteristics and Tests (2)Characteristic
Test
Relative densityASTM C 127 (AASHTO T 85)—fine aggregate ASTM C 128 (AASHTO T 84)—coarse aggregate
Absorption and surface moisture
ASTM C 70, ASTM C 127 (AASHTO T 85), ASTM C 128 (AASHTO T 84), ASTM C 566 (AASHTO T 255)
Strength ASTM C 39 (AASHTO T 22), ASTM C 78 (AASHTO T 97)
Def. of constituents
ASTM C 125, ASTM C 294
Aggregate constituents
ASTM C 40 (AASHTO T 21), ASTM C 87 (AASHTO T 71), ASTM C 117 (AASHTO T 11), ASTM C 123 (AASHTO T 113), ASTM C 142 (AASHTO T 112), ASTM C 295
Alkali Resistance
ASTM C 227, ASTM C 289, ASTM C 295, ASTM C 342, ASTM C 586, ASTM C 1260 (AASHTO T 303), ASTM C 1293
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Aggregates for Concrete
Grading of Aggregate
―Grading is the particle-size distribution of an aggregate as determined by a sieve analysis using wire mesh sieves with square openings.
ASTM C 33ASTM C 33
Fine aggregate―7 standard sieves with openings from 150 μm to 9.5 mm
(No. 100 to 3/8 in.)Coarse aggregate―13 sieves with
openings from 1.18 mm to 100 mm (0.046 in. to 4 in.)
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Aggregates for Concrete
Range of Particle Sizes
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Aggregates for Concrete
Fine-Aggregate Grading Limits
Sieve sizePercent passing by
mass9.5 mm (3/8 in.) 100
4.75 mm
(No. 4) 95 to 100
2.36 mm
(No. 8) 80 to 100
1.18 mm
(No. 16) 50 to 85
600 µm (No. 30) 25 to 60
300 µm (No. 50) 5 to 30 (AASHTO 10 to 30)
150 µm (No. 100) 0 to 10 (AASHTO 2 to 10)
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Aggregates for Concrete
Maximum Size vs. Nominal Maximum Size of Aggregate
Maximum size ― is the smallest sieve that all of a particular aggregate must pass through.
Nominal maximum size ― is the standard sieve opening immediately smaller than the smallest through which all of the aggregate must pass.
The nominal maximum-size sieve may retain 5% to 15%
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Aggregates for Concrete
Nominal Maximum Size of Aggregate
1/5 then narrowest dimension between sides of forms
3/4 clear spacing between rebars and between rebars and the form
1/3 depth of slabs
Size should not exceed ―
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Aggregates for Concrete
Coarse Aggregate Grading
Sieve sizePercent
passing by mass
37.5 mm
(1½ in.)
100
25.0 mm
(1 in.)
95 to 100
12.5 mm
(½ in.)
25 to 60
4.75 mm
(No. 4)
0 to 10
2.36 mm
(No. 8)
0 to 5
Size No. 57 25 to 4.75 mm [1 in. to No. 4]
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Aggregates for Concrete
Grading Limits
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Aggregates for Concrete
Reduction of Voids
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Aggregates for Concrete
Dispersion of Aggregates
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Aggregates for Concrete
Fineness Modulus (FM)
Obtained by adding the sum of the cumulative percentages by mass of a sample aggregate retained on each of a specified series of sieves and dividing the sum by 100.
The specified sieves are: 150 µm (No. 100), 300 µm (No. 50), 600 µm (No. 30), 1.18 mm (No. 16), 2.36 mm (No. 8), 4.75 mm (No. 4), 9.5 mm (3/8 in.), 19.0 mm (3/4 in.), 37.5 mm (1½ in.), 75 mm (3 in.), and 150 mm (6 in.).
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Aggregates for Concrete
Sieve Analysis and FM of Sand
Sieve size
Percentage of individual fraction
retained, by mass
Percentage
passing, by mass
Cumulative percentage
re-tained, by mass
9.5 mm (3/8 in.) 0 100 04.75 mm
(No. 4) 2 98 2
2.36 mm
(No. 8)13 85 15
1.18 mm
(No. 16)20 65 35
600 µm (No. 30) 20 45 55300 µm (No. 50) 24 21 79150 µm (No.
100)18 3 97
Pan 3 0 —Total 100 283
Fineness modulus = 283 ÷ 100 = 2.83
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Aggregates for Concrete
Maximum Aggregate Size and Water Requirement
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Aggregates for Concrete
Maximum Aggregate Size and Cement Requirement
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Aggregates for Concrete
Combined Aggregate Grading
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Aggregates for Concrete
Videograder
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Aggregates for Concrete
Moisture Conditions
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Aggregates for Concrete
Bulking of Sand
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Aggregates for Concrete
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Aggregates for Concrete
D-Cracking
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Aggregates for Concrete
Drying Shrinkage
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Aggregates for Concrete
Harmful Materials (1)
Substances Effect on concrete
Test designation
Organic impurities
Affects setting and hardening, may cause deterioration
ASTM C 40ASTM C 87
(AASHTO T 21)(AASHTO T 71)
Materials finer than the 75-µm (No. 200) sieve
Affects bond, increases water requirement
ASTM C 117
(AASHTO T 11)
Coal, lignite, or other lightweight materials
Affects durability, may cause stains and popouts
ASTM C 123
(AASHTO T 113)
Soft particles Affects durabilityASTM C 235
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Aggregates for Concrete
Harmful Materials (2)
Substances
Effect on concrete
Test designation
Clay lumps and friable particles
Affects workability and durability, may cause popouts
ASTM C 142
(AASHTO T 112)
Chert of less than 2.40 relative density
Affects durability, may cause popouts
ASTM C 123ASTM C 295
(AASHTO T 113)
Alkali-reactive aggregates
Causes abnormal expansion, map cracking, and popouts
ASTM C 227, C 289, C 295, C 342, C 586 C 1260, C 1293
(AASHTO T 303)
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Aggregates for Concrete
Harmful Reactive Substances
Alkali-silica reactive substances
Alkali-carbonate reactive
substancesAndesitesArgillitesCertain siliceous limestones and dolomites
Chalcedonic cherts
ChalcedonyCristobaliteDacites
Glassy or crypto-crystalline volcanics
Granite gneiss
GraywackesMetagray-wackes
OpalOpaline shales
PhylitesQuartzites
QuartzosesChertsRhyolitesSchistsSiliceous shales
Strained quartz and certain other forms of quartz
Synthetic and natural silicious glass
Tridymite
Calcitic dolomitesDolomitic limestones
Fine-grained dolomites
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Aggregates for Concrete
Popouts
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Aggregates for Concrete
Iron Particles in Aggregates
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Aggregates for Concrete
Alkali- Aggregate Reactivity ( AAR ) — is a reaction between the active
mineral constituents of some aggregates and the sodium and potassium alkali hydroxides and calcium hydroxide in the concrete.
Alkali-Silica Reaction (ASR) Alkali-Carbonate Reaction (ACR )
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Aggregates for Concrete
Alkali-Silica Reaction (ASR)
Visual Symptoms Network of cracks Closed or spalled joints Relative displacements
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Aggregates for Concrete
Visual Symptoms (cont.) Fragments breaking out of
the surface (popouts)
Mechanism1. Alkali hydroxide + reactive
silica gel reaction product (alkali-silica gel)
2. Gel reaction product + moisture expansion
Alkali-Silica Reaction (ASR)
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Aggregates for Concrete
Influencing Factors Reactive forms of silica
in the aggregate, High-alkali (pH) pore
solution Sufficient moisture
If one of these conditions is absent ― ASR cannot occur.
Alkali-Silica Reaction (ASR)
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Aggregates for Concrete
Test Methods Mortar-Bar Method
(ASTM 227) Chemical Method
(ASTM C 289) Petrographic Examination
(ASTM C 295) Rapid Mortar-Bar Test
(ASTM C 1260 or AASHTO T 303)
Concrete Prism Test (ASTM C 1293 )
Alkali-Silica Reaction (ASR)
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Aggregates for Concrete
Controlling ASR Non-reactive aggregates Supplementary cementing materials
or blended cements Limit alkali loading Lithium-based admixtures Limestone sweetening (~30%
replacement of reactive aggregate with crushed limestone
Alkali-Silica Reaction (ASR)
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Aggregates for Concrete
Effect of Supplementary Cementing Materials on ASR
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Aggregates for Concrete
Alkali-Carbonate Reaction (ACR)
Influencing factors Clay content, or insoluble residue
content, in the range of 5% to 25% Calcite-to-dolomite ratio of
approximately 1:1 Increase in the dolomite volume Small size of the discrete dolomite
crystals (rhombs) suspended in a clay matrix
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Aggregates for Concrete
Alkali-Carbonate Reaction
Test methods Petrographic examination
(ASTM C 295) Rock cylinder method (ASTM
C 586) Concrete prism test (ASTM C
1105)
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Aggregates for Concrete
Alkali-Carbonate Reaction
Controlling ACR Selective quarrying to avoid
reactive aggregate Blend aggregate according to
Appendix in ASTM C 1105 Limit aggregate size to smallest
practical
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Aggregates for Concrete
Handling and Storing Aggregates
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Aggregates for Concrete
Recycled-Concrete Aggregate
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Aggregates for Concrete
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Aggregates for Concrete
Water Absorption
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Aggregates for Concrete
Videos 1/6
Aggregates Grading curves
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Aggregates for Concrete
Videos 2/6
Void content Fineness modulus
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Aggregates for Concrete
Videos 3/6
Gap graded aggregate Particle shape
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Aggregates for Concrete
Videos 4/6
Bulk Density (Unit Weight) Specific Gravity
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Aggregates for Concrete
Videos 5/6
Absorption Beneficiation
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Aggregates for Concrete
Videos 6/6
Handling and Storing