Concrete and geopolymer materials paper
Lau, I, Setunge, S, & Gamage, N 2014, 'Properties of concrete using scoria lightweight aggregate concrete', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 95-100. ISBN: 9780994152008.
Lightweight Aggregate concrete has been proven to be able to reduce the self-weight of a structure. An experimental study was undertaken using lightweight scoria aggregate concrete (LWSAC) aiming to determine the viability of scoria being used in structural concrete. Bulk density, water absorption and a sieve analysis was conducted on the scoria aggregate prior to mix design for concrete. LWSAC has produced a compressive strength of 30.50MPa at 28 days compared to the control concrete had 38.93MPa. Replacing 15% of Portland cement using fly ash has increased the compressive strength to 41.14MPa at 28 days. Nevertheless, replacing 10% of Portland cement by silica fume, the compressive strength of LWSAC has decreased with the time. Although, high water absorption property of aggregate may have contributed for a relatively high drying shrinkage, it is still within an acceptable limit for general purpose concrete. Therefore it can be concluded that scoria can be used to produce structural concrete with a relatively low density.