Table X. Average Ultimate Strength Of Masonry Materials

Material.

Compression. Lb. per Sq. In.

Tension. Lb. per Sq. In.

Modulus of Rupture.

Building Stone.

Bluestone..........................................

13,500

1,400

2,700

Granite, average................................

15,000

600

1,800

Connecticut...................................

12,000

New Hampshire.............................

15,000

1,500

Massachusetts...............................

16,000

1,800

New York......................................

15,000

Limestone, average .........................

7,000

1,000

1,500

Hudson River, N. Y.....................

17,000

Ohio................................................

12,000

1,500

Marble, Vermont.............................

8,000

700

1,200

Sandstone, average..........................

5,000

150

1,200

New Jersey ...................................

12,000

650

New York.............................

10,000

1,700

Ohio............................................

9,000

100

700

Slate..................................................

10,000

4,000

5,000

Stonework (strength of stone) .......

4/10

4/10

4/10

Brick.

Brick, light red............................

1,000

40

Good common................................

10,000

200

600

Best hard.....................................

12,000

400

800

Philadelphia pressed

6,000

200

600

Brickwork, common lime mortar

1,000

50

Good cement-and-lime mortar......

1,500

100

Best cement mortar.......................

2.000

300

Terra cotta ......................................

5,000

Terra-cotta work.......................

2,000

Cements, etc.

Cement, Rosendale, 1 mo. old.........

1,200

200

200

Portland, 1 mo. old......................

2,000

400

400

Rosendale, 1 yr. old

2,000

300

400

Portland, 1 vr. old.........................

3,000

500

800

Mortar, lime, 1 yr. old......................

400

50

100

Lime and Rosendale, 1 vr. old.......

600

75

200

Rosendale cement, 1 yr. old..........

1,000

125

300

Portland cement, 1 yr. old............

2,000

250

600

Concrete, Portland, 1 mo. old..........

1,000

200

100

Rosendale, 1 mo. old......................

500

100

50

Portland. 1 yr. old.........................

2.000

400

150

Rosendale, 1 yr. old......................

1,000

200

75

The values in the preceding table are ultimate, and from 1/10 to 1/30 of these values is used as the safe working strength of the materials.

The following table gives the safe working loads allowable in good practice for brickwork, masonry, and foundation soils: