... retaining walls. At the same time of preventing the clay granule from passing, it allows the water and the gas pass ... the soil and the gravel of two kinds differentgranule pathway from the groundsill or other buildings. ReinforcementThe highway, railway, ... the bank and thebottom, prevents the water and soil from being washed away.Unit weight, g/m2100150200250300350400450500600800Weight tolerance, %-8 ...