Huge quantities of raw materials are used in making concrete. Due to the limitations of natural materials
the use of waste and by-product materials in concrete can eliminate the negative impact of concrete on
the environment. To produce a cleaner and greener concrete two waste materials from the palm oil
industry were used as coarse and fine aggregates. For this purpose normal sand was replaced with oilpalm-
boiler clinker (OPBC) sand from 0 to 50% in oil palm shell (OPS) lightweight aggregate concrete.
Properties, including workability, different types of density, compressive strength in different curing
regimes, splitting tensile and flexural strengths, stres-sestrain curve, modulus of elasticity, water absorption
and drying shrinkage strain of green lightweight concretes, were measured and discussed. The
results showed that it is possible to produce environmentally-friendly structural lightweight concrete by
incorporating high volume waste lightweight aggregates from the palm oil industry.