SAND-LIME BRICK. 339 
TABLE X.—Tarlac sand and its efficiency as a sand-lime brick 
material—Continued. 
GRANULARIMETRIC COMPOSITION. 
SOV CUN Ome dae es ere eee 10 20 30 40 50 60 80 | 100 200 
Percentage of sand passing 
through specified sieves _____ 98.5 | 74.0] 41.0} 22.0] 11.5 6.5 3.5) 15 0.5 
THE SAND-LIME BRICK. 
Degree of pulverization in per cent through Compressive 
standard specified sieves. _ Molding strength. 
uration | pressure 
Misiure of steam per 
3 treat- square Per 
No. 20. | No. 40. | No. 80. | No. 100. | No. 200, | ment. inch. Total. square 
; inch. 
Hours. | Pounds. | Pounds. | Pounds. 
10 100.0 85.0 71.0 59.0 20.0 5.5 2,300 7, 000 1, 750 
10 100.0 85.0 71.0 |, 59.0 20.0 5.5 4, 600 10, 060 2,515 
11 89.3 24.6 18.3 17.7 10.7 8.0 7, 640 13, 040 3, 260 
11 89.3 24.6 18.3 17.7 10.7 8.0 10, 000 13, 640 3, 410 
12 99.9 60.5 33.8 26.5 20.5 8.0 7, 640 18, 880 3.470 
12 99.9 60.5 33.8 26.5 20.5 8.0 10, 000 15, 920 3, 980 
al3 99.9 68. 4 40.3 34.9 29.6 8.0 7, 640 21, 180 5, 295 
13 99.9 68. 4 40.3 34.9 29.6 8.0 10, 000 25, 960 6, 490 
Molding pres- Density. Absorption after 24 hours in water. 
Mixture | sure in pounds 
No. per square | 
inch. Air dry. Dried at 110°. | Air dry. Dried at 110°. 
2 7, 640 2.19 211 | 3.8 7.5 
12 10, 000 2.24 2.17 | 2.4 5.7 
13 7, 640 2.22 2.16 | 2.1 5.0 
13 10, 000 2.29 2.23 | TC 4.1 
® Ground finer than No. 12. 
As with Pasig sand, the natural coarseness of Tarlac sand 
makes considerable grinding advisable; however, beach sand 
can be advantageously mixed with the more expensive sand. 
This, as well as the manner in which the strength of a given 
mixture may be affected by the quantity of water used, is shown 
in Table XI. 
