MANUFACTURE AND PROPERTIES OF LIME-SAND BRICKS. 143 



The following series of tests show much lower compressive strength 

 and higher absorption than those above quoted. 



The tests summarized in the following table were made in 1901 

 on lime-sand bricks made on the Huennekes system. 



TABLE 53. 

 PHYSICAL TESTS OF LIME-SAND BRICK. (PITTSBTJRG TESTING LABORATORY.) 



In making the absorption tests half bricks were used, which were 

 dried thoroughly before being immersed in water. After remaining 

 in water 45 hours, bricks were frozen 4 hours at a temperature of 14 F., 

 then thawed in warm water 12 hours, frozen again at a temperature of 

 9 F. for a period of 3 hours, thawed in hot water 3 hours, frozen at 

 a temperature of 12 F. for 3 hours, and finally thawed in hot water 

 for 12 hours. Final absorption test made and then bricks were again 

 thoroughly dried. Bricks showed no signs of cracking or disintegration. 



Another series of tests of brick made by the Ventnor Concrete Co., 

 operating on the Huennekes system, is summarized below. 



TABLE 54. 

 TESTS OF LIME-SAND BRICKS. (U. S. NAVAL ACADEMY.) 



Crushing: Size of cube 2"X2"X2;&". 



Per sq. in. 

 3145 Ibs. 

 4125 " 



2588 " 



Total. 



No. 1 ................................. 12,580 Ibs. 



No. 2 ................................. 16,500 " 



No. 3 ................................. 10,350 " 



Absorption: Immersed 72 hours. 



Approximate size of whole brick 8f " X 4|" 



Approximate weight of whole brick 5 Ibs. 14 ounces 



One whole brick and one brick broken in four pieces were soaked 

 in warm water and then put in tin cans with sufficient water to cover 



