1. BS1881: Part 114. Testing concrete: methods for determinations of density of harden concrete. British Standards Institution, 1983.
2. BS6073: Part 1. Precast concrete masonry units, specification for precast concrete masonry units. British Standards Institution, 1981.
3. BS812: Part 2. Methods for determination of physical properties. British Standard Institution, 1975.
4. Residual strength and pore structure of high-strength concrete and normal strength concrete after exposure to high temperatures;Chan;Cement and Concrete Composites,1999
5. Civil Engineering and Development Department, Legislative Council Panel on Environmental Affairs: Updated background brief on management of construction and demolition materials, 2006, .