Daltex Dobbsweir
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Daltex Dobbsweir 3-6mm is a beautiful warm, partially rounded golden gravel with mixed tones.
This attractive gravel can be mixed with Amber Gold 1-4mm for a more compacted finish, however, it is just as effective on its own.
We strongly recommend the use of UVR resin with all DALTEX dried aggregates.
IMPORTANT: DOBBSWEIR COLOUR CHANGE
Whilst Daltex Dobbsweir is still sourced from the same quarry, a new seam is being mined which is lighter than before and showing some colour variation from the previous stone.
Samples of the new Dobbsweir are available for comparison if required.
Hardness - 7
PSV - 30-40
AAV - 2
AIV - 18
PSV - Polished Stone Value
The PSV of an aggregate is a measure of the resistance of an aggregate to polishing and the value is established by subjecting the aggregate to a standard polishing process and then testing the aggregate with a portable skid resistance tester. Aggregate that has a PSV over 60 is regarded as a High Skid Resistant Aggregate. The higher the PSV figure the greater resistance the aggregate has to polishing.
AAV - Aggregate Abrasion Value
A known mass of aggregate chippings are set in resin in a small test panel and subject to abrasion on a grinding apparatus. The loss in weight of the aggregate after a specified time as a percentage of the original weight is the AAV.
AIV - Aggregate Impact Value
The aggregate impact value is a strength value of an aggregate that is determined by performing the Aggregate Impact Test on a sample. The AIV is the percentage of fines produced from the aggregate after subjecting it to a standard amount of impact. Below 10 would be regarded as strong, above 35 would normally be regarded as too weak to be used in road surfaces.
ACV - Aggregate Crushing Value
The aggregate crushing value is a value which indicates the ability of an aggregate to resist crushing. The lower the figure, the stronger the aggregate ie the greater its ability to resist crushing.