Show IMPROVED ROADS ROADS SUITABLE material often mixed on road bed by traffic arrow used urd to advantage in construction of sand clay rondo rondi tho thi necessary drainage ts is first pro pio tided and then the most suitable clay obtainable hauled ana an spread on the road to such a depth as tests have shown hown to be necessary to form a road surface eight to ten inches deep in general genera this willbe will be about six inches at the center and tapering toward the sides idea professor house of the colorado agricultural college says that in the best beat sand clay roads analysis nna lysla gives the following sand t NL av za if goodcase good care Is exercised in building sand clay roads are satisfactory about two thirds cloy clay one third As the purpose of the clay Is to fill the voids and coat the grains of sand six inches of loose loos eor or three inches of compact clay should make a sand clay surface of the proper mixture between eight and ten inches thick after the clay is spread it will gen brally be found advisable to cover it with a little sand which can be done by means of the road machine or grader the next step Is thorough in corporation compoi atlon of tire the materials the mixing proper may be done in a number of ways and to suit stilt the facilities of the builder it the work Is done just preceding or during the rainy season it way may be left entirely to traffic with frequent shaping by the road grader or drag after heavy rains mina but this process Is hard on traffic and requires required a long time the mixing tan can be done most efficiently by means of a disk harrow either during or immediately after a rain or the water may be added with a sprinkling cart th tb first partial mixing may be done dri buethe but the final mixing must be thorough and should be done when the entire road surface li Is completely saturated with water until a plastic mortar like mixture Is secured this should be followed by a final shaping with the road machine and comp compacting compaction g by either a roller or by traffic |