TABLE 1 - SELECTED PROPERTIES OF CONCRETE,!'^ POLYMER 

 CONCRETE, 15 AND POLYMER-IMPREGNATED CONCRETeI^ 



Compressive 

 Strength 



Concrete 



PC 



PIC 



MPa 



psi 



MPa 



psi 



MPa 



psi 



33.3 



5,000 



24-138 



3,500- 

 20,000 



100 



15,000 



Tensile 



(splitting) 

 Strength 







9.6 



1,400 



~ 



— 



Tensile 

 (direct) 

 Strength 



2.8 



400 



" 



' 



7 



1,000 



Modulus of 

 Elasticity 



23,600 



3.5 X 10^ 



36,000 



5.3 X 10^ 



41,000 



6.0 X 10^ 



Shear 



Strength 



- 



- 



- 



~ 



5 



750 



Modulus of 

 Rupture 



- 



- 



- 



- 



9 



1,300 



Polsson's 

 Ratio 



- 



- 



0.23 



0.23 



0.20 



0.20 



Additional research and development are needed to determine the 

 following properties of PIC and to prove its practicability: (1) splitting 

 tensile strength, (2) flexural strength, (3) Young's modulus, (4) water 

 tightness, and (5) sulfate resistance. 



Technology Deficient Areas 



Haynes and Rail, 10 in their study of concrete for OTEC structures, 

 summarized the capacities and limitations of available concrete technology 

 and construction practices and identified deficiency areas. Areas that 

 have been identified as requiring further research and development to pro- 

 vide improvements in concrete technology, greater assurances for long-term 

 safe and reliable operation of OTEC systems, and lower cost structures are 

 listed : 



