10,000 



S. 6,000 



— .— experimental 



^-^ computer input model 



Figure B-7. Uniaxial compressive stress-strain relationship for concrete. 



The water-to-cement ratio was 0.37 and a retardant admixture, E42 

 Master Builder, was used at 4.1 ounces (0.12 kg-) per 100 pounds (45.4 

 kg) of cement. The compressive strength of this mix was 5,520 psi 

 (38.1 MPa) at 7 days taken from three 3x6-inch (76xl52-mm) control 

 cylinders. 



TEST RESULTS 



Implosion 



Test conditions and implosion results are presented in Table B-4. 



The implosion pressure, P. , and non dimensional ratio of implosion 



'^ ^ mi 



strength, P. /f, are given along with data on the failure hole size and 

 boundary behavior. 



A summary of the implosion results is given in Table B-5. 



56 



