Changes

Jump to navigation Jump to search
m
no edit summary
Line 16: Line 16:  
|Thickness (mm)||This is the thickness of just the pre-cast blocks (or depth of asphalt/concrete poured in place).
 
|Thickness (mm)||This is the thickness of just the pre-cast blocks (or depth of asphalt/concrete poured in place).
 
|-
 
|-
|Void ratio||This most commonly refers to the jointing material used between precast blocks. Suggest 0.35 unless otherwise tested. Where a pervious product is poured in place, an appropriate figure should be obtained from the manufacturer.
+
|Void ratio||This most commonly refers to the jointing material used between precast blocks. Suggest 0.4 unless otherwise tested. Where a pervious product is poured in place, an appropriate figure should be obtained from the manufacturer.
 
|-
 
|-
 
|Impervious surface fraction||This is the proportion of the total pavement taken up with the pre-cast blocks and will vary between products; an example value may be 0.85.  
 
|Impervious surface fraction||This is the proportion of the total pavement taken up with the pre-cast blocks and will vary between products; an example value may be 0.85.  
Line 29: Line 29:  
|Thickness (mm)||Depth of bedding layer
 
|Thickness (mm)||Depth of bedding layer
 
|-
 
|-
|Porosity (fraction)||Suggested range 0.35 – 0.4 unless otherwise tested
+
|Porosity (fraction)||Suggested range 0.4 unless otherwise tested
 
|-
 
|-
 
|Field capacity (fraction)||Suggested range 0.10 - 0.12 for sand<ref name = SWMM/>
 
|Field capacity (fraction)||Suggested range 0.10 - 0.12 for sand<ref name = SWMM/>
8,255

edits

Navigation menu