 | George Drysdale Dempsey - 1890 - 430 Seiten
...maintaining a breaking weight of 500 pounds on \\ square inches, seven days after being made in an iron mould, and immersed in water during the interval of seven days. The total cost of the main drainage works amounted to aboiit £4,100,000. There were, in 1865, a total... | |
 | Gilbert Richard Redgrave - 1895 - 270 Seiten
...of 250 Ibs. per square inch (562'5 Ibs. on 2J square inches), seven days after being made in a brass mould, and immersed in water during the interval of seven days. The contractor shall at all times keep in store upon the works a, supply of cement equal to at least fourteen... | |
 | Charles F. Mitchell, George Arthur Mitchell - 1904 - 482 Seiten
...bluish-grey cement would be over-limed and likely to blow. (d) Tensile Strength. — Average 350 to 400 Ibs. per square inch seven days after being made in a mould, and immersed in water during the entire interval. (e) Test for Coolness. — If the cement contains too much lime, or is imderburnt,... | |
 | 1873 - 536 Seiten
...following, viz. : — 1. The Portland cement shall be of the very best quality, ground extremely fine, and weighing not less than 112 Ibs. to the striked bushel,...immersed in •water during the interval of seven days. Such test, when necessary, and ordered by the District Surveyor, to be made at the works of the ^Metropolitan... | |
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The whole of the cement shall be Portland cement of the very best quality, ground extremely fine, weighing not less than 112 Ibs. to the striked bushel, and capable of maintaining a breaking weight of 350 Ibs. per square inch seven days after being made... 
