CONCRETE
Concrete is made by mixing cement with sand, gravel, broken stone or similar material (called aggregate) and water. Concrete is usually made with Portland cement. FACTORS OF GOOD CONCRETE. The factors in good concrete arc: (a) Fnrst-class cement or lime; (bl clean, hard, well graded aggregate (grading means reducing step by step from the largest size which the thickness and the character of tlie work admits to coarse sand); (e) thorough mixing; (d) using the right proportion of water; (e) placing the concrete shortly after mixing—say, within one hour; (f) ramming sufficiently to consolidate the mass; (g) watering often after the concrete is one day old for at least seven days, because, no concrete can be strong which dries rapidly. Note.—Concrete which is to be placed in water should be mixed extra wet and never rammed. One ton of Portland cement (New Zealand manufacture) equals 18 bags (124.4/9 lb. net each.)
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Bibliographic details
Wanganui Chronicle, Volume LXXXI, Issue 18785, 19 May 1923, Page 14
Word Count
152CONCRETE Wanganui Chronicle, Volume LXXXI, Issue 18785, 19 May 1923, Page 14
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