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Testing of Concrete Paving Blocks
by John Cairns
Director CMA
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Current SANS 1058
DimensionsStrength Compressive
Proposed SANS 1058
DimensionsStrength Tensile Splitting
Abrasion
Water Absorption
Critical Considerations
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Critical Dimensions
Length 2mm
Width 2mm
Thickness 3mm
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A compressive test
A flexural strength test
A tensile splitting test
Strength Testing
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Compressive Strength
Elevation
Plan
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50 60 80
100 150 100
200 200 100
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200
100 100
100
30MPa 18MPa
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60%
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Tensile Splitting
T = 0,637 x k x P
St (mm) 40 50 60 70 80 90 100
k 0,71 0,79 0,87 0,94 1,00 1,06 1,11
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Tensile Splitting
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Comparison of Compressive StrengthWith Abrasion Resistance
Sample Comparison StrengthMPa Abrasion Mass LossGrammes
1 23.5 8
2 24,0 25
3 51,0 9
4 49,5 20
5 27,5 12
6 57,0 16
7 29,0 4
8 28,0 31
9 57,5 17
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Abrasion Resistance Tests
Wire Brush
Ball Bearing MA20
Sand Blasting
Bhme
Wide Wheel
Ball Bearing AS/NZS445.9
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Abrasion Testing Machine
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Salt Attack
Discolouration
Water Absorption
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Examples of Paving in South Africa
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Permeable Paving
Cape Town Grand Parade
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Permeable Paving
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Permeable Paving
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Thank You