SAND-LIME BRICK. 335 
TABEE VII.— Maytubig beach sand and its efficiency as a sand-lime brick 
material—Continued. 
ie CHARACTERISTIC GRANULARIMETRIC COMPOSITION. 
Standard sieve No._-__-_-__---- 10 20 30 40 50 60 80 100 200 
Meshes per linear inch_________ 10 20 30 40 50 60 80 100 200 
Diameter of openings in milli- 
meters !oi22os=22= 55-55-8825 1.85] 0.92) 0.56] 0.47) 0.34] 0.28] 0.20] 0.15] 0.06 
Percentage of sand passing 
through specified sieves _____ 100.0 |100.0 99.9 | 99.7 | 98.0 96.5 | 80.4} 51.7] 6.0 
THE SAND-LIME BRICK. 
Compresssive 
be a : Dares \Molding strength. 
1x- a . rea of | tion of |pressure 
ture Fineness of sand as used. Dimensions bearing | steam per 
No. * |surface.| treat- | square Per 
ment. inch. Total. | square 
inch. 
Inches. Sq. in. | Hours. | Pounds.| Pounds.) Pounds. 
MAS received <==2 2225508 = 22-2 5-! 2X22), 4.0 5.5 4,600 7, 200 1,800 
2 | One-fourth pulverized __ 2 2X2X2 | 4.0 5.5 4, 600 7, 720 1, 980 
DiPAlsineceived ¢==2- 22-5. - see teb 2 = 2X2X2; 4.0 8.0 | 10,640 | 13,880 3,470 
2 | One-fourth pulverized _________-- | 2X2XK2 4.0 8.0 | 10,640! 11,200 2, 800 
8 | One-tenth pulverized ____________ 3X3X2.25 6.75 8.0 10,000 | 20,560 | 23,200 
Oy eee Oe es ae ee anes sean ees 3X3 X2, 25 6.75 8.0] 15,000 | 25, 920 3, 840 
4 2X2X2 4.0 8.0 7,640 | 8,000 2, 000 
4 2X2X2 4.0 8.0 10,000 | 13,360) »3,340 
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°. 
| 4 10, 000 2.08 | 2.01 | 7.40 11.0 
* Plate III, fig. 2, is a photograph of the finished product. 
b Plate IV, fig. 2, is a photograph of the finished product after an attempt had been 
made to polish the front surface. This brick had a density (air-dried) of 2.08 and it 
absorbed 7.4 per cent by weight of water after being submerged for twenty-four hours. 
In all instances, the bricks had a pleasing steel-gray color 
which after several months’ exposure to sun and rain had not 
changed, but the surface would not take a good polish. 
Pasig sand.—Most of the sand used in Manila is dredged or 
dipped up in baskets from the Pasig and its principal tributary, 
the Mariquina River. A good sand-lime brick can be made with 
this sand, but the supply is rapidly decreasing owing to the 
great quantity used for concrete construction work. 
cee 
eo 
