. Economic Papers. COUNTRY ROADS IN NORTH CAROLINA 49 Cement: A well-known brand of Portland cement shall be used whichwill meet the requirements of the specifications of the American Societyof Testing Materials. Sufficient means shall be used to protect thecement against dampness and no cement shall be used which has becomecaked from exposure to dampness. Sand: Sand shall be clean, hard, and coarse, and of grains varyingin size. It shall be free from sticks and other foreign matter, but it maycontain clay or loam not to exceed five (5) per cent. Crusher dust,screened to reject all particles o
. Economic Papers. COUNTRY ROADS IN NORTH CAROLINA 49 Cement: A well-known brand of Portland cement shall be used whichwill meet the requirements of the specifications of the American Societyof Testing Materials. Sufficient means shall be used to protect thecement against dampness and no cement shall be used which has becomecaked from exposure to dampness. Sand: Sand shall be clean, hard, and coarse, and of grains varyingin size. It shall be free from sticks and other foreign matter, but it maycontain clay or loam not to exceed five (5) per cent. Crusher dust,screened to reject all particles over one-quarter (|) inch in diameter,,may be used instead of sand, if approved by the engineer. Stone: Stone shall be sound, hard, and durable, and crushed to sizesnot exceeding two and one-half inches in any direction. For reinforcedconcrete sizes are usually not to exceed one inch in any direction, butmay be varied to suit character of reinforcing material. No stoneexceeding one inch in any direction shall be use
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