Admixtures . - The following additives were tested as stabilizing 

 agents for beach sand-cement grout: 



Airox pozzolan (processed volcanic tuff) 



Alfesil (fly-ash) 



Zeogel (barite clay) 



Aquagel (bentonite) 



Rotary drilling clay P-95 (Macco Corporation) 



Natural sandy loam and cement 



The only tests made were comparative in nature. Grout specimens were 

 molded in a conic frustrum 1-1/2 inches across the top, 3-1/2 inches across 

 the bottom, and 3 inches high. The specimens were anchored to a steel plate 

 with three small prongs and placed in a hydraulic flume running 12 inches 

 deep at a velocity of b.5 feet per second. Time of immersion and loss of 

 material were as tabulated below: 



Test No. 



Mixture 



1 



0.9!? lb. beach sand 





0.U7 lb. cement 





0.10 lb. airox pozzolan 





0.52 lb. water 



Immersion time 

 52 seconds 



Loss (%) 



100 



0.95 lb. beach sand 



0.30 lb. cement 



0.20 lb. airox pozzolan 



0.35 lb. water 



1 minute 



75 



1.00 lb. beach sand 



0.30 lb. cement 



0.30 lb. alfesil 



0.22 lb. water 



1.00 lb. sandy loam 



0.22 lb. cement 



0.27 lb. water 



1 minute 



1 minute 



92 



^ 



6 



1.00 lb. beach sand 1 minute 



0.30 lb. cement 



0.30 lb. aquagel 



0.5l lb. water 



1.00 lb. beach sand 1 minute 



0.30 lb. cement 



0.30 lb. P-95 rotary clay 



0.31 lb. water 



1.8 



1.7 



1.00 lb. beach sand 

 0.30 lb. cement 

 0.30 lb. zeogel 

 0.59 lb. water 



1 minute 



Hi.5 



1.00 lb. beach sand 

 0.30 lb. cement 

 0.30 lb. P-95 rotary clay 

 0.31 lb. water 



4 



2U minutes 



78.8 



