Table 4. Compressive Strengths and Antifouling Properties of Concrete 

 Impregnated With Various Chemical Mixtures 



Antifouling 

 Chemical 

 Mixture 



Approximate 



Compressive Strength 



of Concrete (psi) 



Fouling Growth After 

 Exposures of 3 to 4 

 Years in the Ocean 



Creosote-based mixtures 

 containing TBTO at a 

 level of 250 ml/liter 

 (Systems 5 and 8) 



Creosote-based mixtures 

 containing TBTO at a 

 level of 100 ml/liter 

 (Systems 7, 9, and 10) 



Creosote only (System 2) 



Copper naphthenate in 

 petroleum and creosote 

 (Systems 11, 12, and 13) 



Thin film of TBTO impregnated 

 rubber on unimpregnated 

 concrete 



Water and malachite green 

 (System 4) 



Water and quaternary amine 

 (System 6) 



Water only (System 14- 

 the controls) 



3,500 



5,000 



5,000 



scant to none 



light 



heavy 



heavy 



heavy 

 heavy 

 heavy 



19 



