14 . Paving Blocks - J Cairns

7/31/2019 14 . Paving Blocks - J Cairns

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Presenter: John Cairns

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


50 60 80

100 150 100

200 200 100


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200

100 100

100

30MPa 18MPa


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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Presenter : John Cairns

Permeable Paving

Cape Town Grand Parade


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Permeable Paving


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Permeable Paving


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Thank You

Documents

14 . Paving Blocks - J Cairns