. Practical concrete work for the school and home. f a sackbecause when dumping it from the sack its flufifiness willdeceive one as to its bulk. Correspondingly small volumes of sand and pebbles mustalso be measured. Cement sacks should be carefully takencare of and not allowed to get wet, as they will be bought backby the dealer, if in good condition. Order of Mixing.—In hand mixing, the required amountof sand should be measured first in the measuring box andspread out in a layer of uniform thickness on the mixing should then be dumped on this sand the measured orweighed quantity
. Practical concrete work for the school and home. f a sackbecause when dumping it from the sack its flufifiness willdeceive one as to its bulk. Correspondingly small volumes of sand and pebbles mustalso be measured. Cement sacks should be carefully takencare of and not allowed to get wet, as they will be bought backby the dealer, if in good condition. Order of Mixing.—In hand mixing, the required amountof sand should be measured first in the measuring box andspread out in a layer of uniform thickness on the mixing should then be dumped on this sand the measured orweighed quantity of cement for the size of batch being and cement should then be turned thoroughly a numberof times, square pointed shovels being used for the purpose,until the two materials have been so thoroughly mixed thatthe mass is of uniform color throughout, free from streaks ofgray or brown, indicating that the cement and sand have beenthoroughly combined. This will usually require that the ma-terials be thoroughly turned three or more Sirliuul IjiiVb luixing cuiiLicte pnpai atoi y to laying concrete sidewalk. PRACTICAL CONCRETE WORK 51 Next the required amount of pebbles or broken stoneshould be measured, thoroughly sprinkled, and added to thesand-cement mixture. One or two turnings should be giventhe materials while dry, after which water should be added,preferably from a watering pot with sprinkler attachment, orfrom hose with spray nozzle, water being added gently whilesome one turns the materials repeatedly to prevent the waterfrom washing away the cement. The combined materialsshould be turned several times until every pebble or particle
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