i need to know a rough weight for a cubic metre of coarse gravel that has been used for a beach renourishment scheme, so as i can carry out some computer modelling of this scheme and its effects on the surrounding area. an average weight for a cubic metre of beach sand would also be helpful!
2006-11-21 01:25:53 · 5 answers · asked by jamie 1 in Science & Mathematics ➔ Earth Sciences & Geology
Say 1.4 tonne for the gravel, and 1.6 to 1.7 tonne for the sand because the grain size is more varied.
2006-11-21 01:56:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Assuming the gravel has a density of 2.65 g/cm3 (as per quartz, flint, chert, etc, which most gravel is made of). You can then work out how much 1 cubic metre will weigh. But it's loose, unconsolidated stuff, so it will probably have around 40% porosity (but this varies, according to the roundness of the gravel particles, and their grading (mixed coarse and fine particles, etc). But as an estimate, you'll need to multiply yout weight of a cubic metre by 0.4. If it's wet (i.e moist) gravel,you might have to add a bit of upside for the water; if the gravel is fully immersed in the water, you'll have to account for the weight of that too I suppose.
2006-11-23 20:29:33 · answer #2 · answered by grpr1964 4 · 0⤊ 0⤋
If your D50 is 350mm, (i.e. 50% of the sample weight is particles >350mm) you haven't got a coarse gravel, you've got cobbles and boulders. Cobbles are usually taken to start at 60mm, boulders at 200mm.
A D50 of 35mm might be more typical for a very coarse gravel.
The density is going to be very dependent on grading; if the particles area all of similar size you could have a porosity approaching 50%. With a particle S.G. of 2.65 (fairly typical) that gives a dry density of 1.8 tonnes/m^3.
If the gravel is well graded, i.e. there are smaller particles to fit the voids between the bigger ones, porosity will be closer to 33%, and the density will be nearer 2.1 tonnes/m^3
2006-11-22 19:57:44 · answer #3 · answered by Paul FB 3 · 0⤊ 0⤋
If you mean clean gravel, as in shingle, it roughly converts to 1.3 tonnes per cube. Gravel with fines in is much denser and converts roughly at 1.8 tonnes per cube.
2016-05-22 06:01:15 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Yep say 1.6 tonnes
2006-11-21 02:56:56 · answer #5 · answered by Anonymous · 0⤊ 0⤋