Material properties Roman concrete

crystal structure of tobermorite: elementary unit cell

compressive strengths modern portland cements typically @ 50 mpa level , have improved ten-fold since 1860. there no comparable mechanical data ancient mortars, although information tensile strength may inferred cracking of roman concrete domes.

concrete strengths , data 2 different things.

these tensile strengths vary substantially water/cement ratio used in initial mix. @ present, there no way of ascertaining water/cement ratios romans used.

in knowing fact of differing ratios accomplish deduction of romans non-use was, portland cement.

there no extensive data effects of ratio on strengths of pozzolanic cements, however, since 1984 federalated research nuclear waste containment, persons may seen making roman cement in plastic buckets on social media .