Chronic Logic

we have heavy and light steel elements .. those can handle both compression and tensile loads ..

we have cable .. which can handle only tensile loads, but no compression loads ..

but why do we not have concrete .. which can handly only compression loads, but no tensile loads ?

i am playing complex, difficulty set to hard .. and i have been trying to solve complex level 3 for 4 days not .. no luck . .

any hints ?