Table Showing The Compressive Strength Of The Same Limes And Cements

TABLE showing the Compressive Strength of the same Limes and Cements mixed with different proportions of Sand weighing 127 lbs. to the bushel. All kept dry. Size 6 inch cubes - each number the average of ten cubes.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

Lbs.

6 to l

5712

10,393

6417

9,654

12,913

14,918

20,787

19,107

9676

56,425

48,384

6 to l

8 to l

2576

4,278

6204

10,988

6,014

8,579

19,196

12,208

5980

42,806

51,363

8 to l

10 to 1

2912

4,569

6451

5,745

4,793

7,571

11,849

8,624

3248

29,971

29,232

10 to l

12 to 1

..

..

..

..

..

..

..

..

..

20,809

16,329

12 to 1

1 Grant, M.P.I.C.E., vol. lxii. p. 165.

Limit To Increase Of Strength With Age

Mr. Grant's experiments with a cement weighing 123 lbs. per bushel led him to the conclusion that it attained its maximum strength after constant immersion for two years, and that there is no reason to fear that a good cement ever deteriorates. The period at which the maximum strength is attained varies, however, with the class of cement - in the case of a light cement it would probably be much shorter.