Unclassified 



seawater saturated condition and exhibited increases in compressive strengtli of 26%, 

 split tensile strength of 4%, elastic moduli of 4% and an equal Poisson's ratio. The 

 strongest mix for PFA concrete had a compressive strength of 6,580 psi, compared to 

 5,200 psi for regular lightweight concrete, at an age of 28 days under continuous fog 

 curing. Both mixes have a weight savings of 40%, compared to that of normal weight 

 concrete in a submerged, saturated condition. A discussion of cost is presented and shows 

 that the in-place structural cost of PFA concrete would be about 30% greater than normal 

 concrete. 



Library Card 



Civil Engineering Laboratory 



LIGHTWEIGHT CONCRETE USING POLYMER-FILLED 

 AGGREGATE FOR OCEAN APPLICATIONS - AN 

 EXPLORATORY INVESTIGATION (Final), by H. Haynes 

 TN-1565 26 pp illus December 1979 Unclassified! 



1. Lightweight concrete 2. Polymer concrete I. ZF6 1-5 12-001-083 



A lightweight concrete specially suited for deep ocean applications was tested for its 

 strength properties and compared to similar regular lightweight concrete. The new concrete 

 used lightweight aggregate particles (expanded shale) which were filled with a polymeric 

 material. The polymer-filled aggregate (PFA) was conventionally mixed with portland 

 cement and water to make the lightweight concrete. Four concrete mixes were tested. In 

 general, the PFA concrete, compared to regular lightweight concrete, has an equal unit 

 weight in a seawater saturated condition and exhibited increases in compressive strength of 

 26%, split tensile strength of 4%, elastic moduli of 4%, and an equal Poisson's ratio. A 

 discussion of cost is presented and shows that the in-place structural cost of PFA concrete 

 would be about 30% greater than normal concrete. 



Unclassified 



