excavated material - weight per m3

[LMS]

I'm currently evaluating a site clearance project in the UK.

I'm having trouble in locating good quality data relating to the weight of excavated materials. Specifically the weight per m3 volume of Alluvial Clay, Glacial Clay & topsoil.

I require this data to establish the validity of the quantity of material excavated given a nett weight provided by tip where the material was deposited. I am aware that my requirements are a little vague but any help would be appreciated.

Many thanks.

 

[sc]

lms,

1. Work out the volume excavated by survey if possible.

2. Find the insitu density of the material (most soils are
in the range of 18-22 kN/m3).

3. Now work from these two items to get your actual weight
of material excavated. This weight will equal the weight
deposited at the tip (+- a small percentage to allow for
variations in insitu density).



regards
sc

 

[Hambley]

HI!

The specific gravity of cohesive, plastic clay is typically on the order of 2.70, whereas the S.G. of alluvial clay (or more properly silt) and topsoil is approximately 2.40. One other consideration: silts and topsoil do not expand on excavation, but cohesive clays can expand up to 40% by volume. Hence, the volume of excavated material based on the number of truckloads can vary substantially from the surveyed volume in situ. For payment purposes, use either surveyed volume removed (based on before and after surveys) or weight removed based on a weightometer. The weight can be related to the excavated volume if the pre-excavation in-place density was measured as suggested by a previous respondent. Hope this helps!!