Show MATERIALS FOR GOOD ROADS exact proportions proportion of sand and clay cannot B be given definitely because of variations variation tho exact proportions of sand band and clay for making the best sand clay road cannot be stated as the pro proportions par vary with the character of the sand according to its sharpness percentage of foreign material and size 0 at grains approximately there iti Is in a sand band clay road about eighty per cent sand and twenty per cent clay one simple mearin means of determining the theoretical amount of pure clay that should be added to any sand that in to be used in the construction of a sand clay road Is to nil 1111 a glass turn tumbler bler brim full with the sand that Is to lo bo be used and then a similar tumbler w with ith water hater pour the water carefully onto the sand until the water comes hubli flush with the surface which will mean that all the volda voids between tin the grains of sand are now filled with water the amount of water that has haa been poured into tho tu tumbler containing the sand band will rep reprise rese t the proportion of volume of clay that la Is necessary to add to that particular sand to till fill all the voids with clay having determined the of supply of tho the best beat materials for making a sand clay road the next question Is the mixing of the materials and title this varies with the character of the sub subsoil soll whether this la Is a sand mand upon tipon which clay la Is to be added or clay upon which sand Is to be added it will be found that it Is much easier to make a sand clay road where the subsoil Is clay |