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, stressestrain 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.