ABSTRACT
Structural lightweight concrete is defined as having an oven-dry density of less than 2000kg/m3 [1]. The aggregates used may be a combination of fractions of both lightweight coarse and fine materials or lightweight coarse material with an appropriate, natural fine aggregate. However, the general term lightweight concrete refers to any concrete produced to an oven-dry density of less than 2000 kg/m3 . This can be achieved with most natural aggregates if the concrete is made in such a way that excess air is incorporated for example, as no fines or foamed concrete. These types of concrete are outside the scope of this book and are not considered further.
