chapter  5
22 Pages

Durability

ByO E Gjørv

Recent developments in concrete technology have made it possible to produce concrete mixtures with strength properties that are beyond the strengths that are currently used by the structural design practice. For high-quality natural mineral aggregates, compressive strengths of up to 33.000 psi (230 MPa) can now be produced under laboratory conditions.' If the mineral aggregate is replaced by high-quality ceramic aggregate, compressive strengths of up to 65,000 psi (460 MPa) can be achieved under controlled laboratory conditions.' Even with lightweight aggregate, compressive strengths of more than 14,000 psi (100 MPa), with a density of less than 3200 1b/yd3(1900 kg/m3), can be obtained.3