Materials used in sidewalks, curbs, drives, gutters, and pavements shall be in accordance with the following standards:
CEMENT. Portland cement shall conform to the Standard Specifications for Portland Cement (Serial Designation C-150-56) of the A.S.T.M. High-Early-Strength Portland Cement shall conform to the standard specifications for High-Early-Strength Portland Cement (Serial Designation C-150-56) of the A.S.T.M.
FINE AGGREGATE. Fine aggregate shall consist of a natural sand or a combination of natural sand and not more than 50 percent of stone screenings. Sand shall be uniformly graded, composed of clean, hard, durable particles of natural materials free from adherent coatings. It shall contain no lumps, soft or flaky particles, clay, loam, foreign, organic, or other deleterious matter. Stone screenings shall consist of the clean, dustless product resulting from the crushing of stone or gravel, meeting all the requirements for coarse aggregate except for grading. Fine aggregate containing more than five per cent by weight of deleterious substances shall not be used. Fine aggregate shall be well graded in size from coarse to fine, and shall conform to the city of Dallas Addendum to the Public Works Construction Standards – North Central Texas as Published by the North Central Texas Council of Governments, current edition.
All tests for fine aggregate shall be made in accordance with the current applicable methods of tests of the A.S.T.M.
COARSE AGGREGATE. Coarse aggregate shall consist of the uniformly graded, clean, hard, durable, uncoated particles of natural gravel or crushed stone or gravel, free from adhering coatings. Coarse aggregate shall not contain more than five per cent by weight of deleterious substances. Coarse aggregate shall be well graded in size from coarse to fine, and shall conform to the city of Dallas Addendum to the Public Works Construction Standards – North Central Texas as Published by the North Central Texas Council of Governments, current edition.
All tests for coarse aggregate shall be made in accordance with the current applicable methods of tests of the A.S.T.M.
PIT-RUN AGGREGATE. Pit-run aggregate will be permitted provided that portion passing the No. 4 sieve shall conform to these specifications for fine aggregate, and that portion retained on the No. 4 sieve shall conform to these specifications for coarse aggregate.
WATER. Water used in mixing and curing concrete and mortar shall be clean and free from oil, acid, alkali, foreign organic matter, or other deleterious substances. (Ord. Nos. 8590; 31313)