APPLICABILITY OF NAM O WHITE MARINE SAND AS AN ALTERNATIVE FINE AGGREGATE FOR CONCRETE IN QUANG NAM

Nowadays, the making of engineering concrete from appropriate local material becomes a more important concern. This paper aims to use the different methodological systems to evaluate the potential reserves of Nam O white marine sand in Quang Nam province, this sand type is used for mixing with other local materials as concrete fine aggregate which includes fine crushed stone and Thu Bon river sand. This white marine sand is a high potential for replacing partly traditional river sand being run out. Research results indicate that study white sand has a wide distribution area, favorable exploitation conditions, and potential mining reserves reach up to 8017 mil. m3. The technological properties of white marinesand and mechanical properties of concrete, as well as these design mixing ratios, meet the technical requirements for concrete fine aggregates with compressive strength from 250 - 260 daN/cm2. This concrete compressive strength (Rc) and flexural strength (Rf), extracted from nondestructive methods, follow a logarithmic correlation like typical concretes. Especially, Rc and Rf rises considerably and rapidly in the first period from 3 to 28 days and drops slowly after 28 days.