Southern good roads . writer lielieves the sand clay road will be found ofnuieh wider application than at present agreed. Theirfirst cost is often as low* as 10c. per square yard. SHELL Road Crusts, like Gravel will be consideredunder two heads—Shell Roads and Shell ;\lacad-am. In many localities through the south a mixtureof shells with sand. silt, etc., is obtained by dredgingin the s1i-eaiiis and is fr( (juently available at low mixture, when ctuitaining a sufficient proportion(if sliells and pioperly applied, furnishes frequently avery satisfact oi-y road crust for light traffic
Southern good roads . writer lielieves the sand clay road will be found ofnuieh wider application than at present agreed. Theirfirst cost is often as low* as 10c. per square yard. SHELL Road Crusts, like Gravel will be consideredunder two heads—Shell Roads and Shell ;\lacad-am. In many localities through the south a mixtureof shells with sand. silt, etc., is obtained by dredgingin the s1i-eaiiis and is fr( (juently available at low mixture, when ctuitaining a sufficient proportion(if sliells and pioperly applied, furnishes frequently avery satisfact oi-y road crust for light traffic at a first(?list 111, say, 20c. pel s(|uare yard. It is. however, lia-ble til loosening in dry weathei- uidess Oiled andreadily becomes horse pathed under periodic horsedrawn traffii- in one direction. Shell Macadam is built, as in the case of l)rokenstone or gravel nuieadam, from the shells —obtainable from siudl heaps at the canning factories orelsewhere—spread, compacted, and then the voids fill-. Hard-Surface Marl Road, Near Jacksonville, Fla, ((1 with sand or similar nmterial l)y the aid of water orother li(|uids. Using the shells in this way, .just as ifthey were broken stone, secures the greatest valiiefiom them and the shell macadam so formed is light,strong, reasonably resistant, and particularly valuablefor moderate traffic on sandy roads. The addition ofpitch by the penetration method is also successfullymade to shell macadam and it is easily practicable toconstruct and maintain a pitch (in* bituminous) carpeton the top of shell macadam, which will add toits field. In the cases where pitch is so used, the finermineral material to go with the pitch should preferablybe clean pea gravel or stone chips rather than finesand. Shell macadam has a pleasant resiliency notpossessed by either gravel or broken stone first cost (waterbound)—depending of course onthe price of the shells—will vaiv l)etween 25c. and 50c.]ier square yard. SLA
Size: 2029px × 1231px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorvarnerhe, bookcentury1900, bookdecade1910, bookyear1910
