ABSTRACT
Radical Concrete Technology. Edited by R K Dhir and P C Hewlett. Published in 1996 by E & FN Spon, 2-6 Boundary Row, London SE1 8HN, UK. ISBN 0 419 21480 1. ABSTRACT. Attempts have been made to maximize the strength of ‘very high strength’ concrete, that is concrete with a compressive strength at 28 days of over 100 N/mm2. The measures taken for maximizing the strength include: a) using high strength aggregate; b) incorporating silica fume; c) employing steel fibres; d) lowering the water-cementitious ratio. Results show that the 28-day compressive strength of a 95 MPa concrete can be increased by about 70% to 160 MPa by adopting the above methods. Keywords: Very high strength, High strength aggregate, Silica fume, Steel fibres. Dr Sammy Yin Nin CHAN is an Assistant Professor at the Hong Kong Polytechnic University. He is a committee member of the Structural and Materials Divisions of the Hong Kong Institution of Engineers and a member of the Hong Kong Reinforced Concrete Design Code Review Committee. His research interests include high strength concrete and durability of concrete structures. Professor Mike ANSON is the Dean of the Faculty of Construction and Land Use at the Hong Kong Polytechnic University. He was a researcher in concrete technology in earlier years and into the behaviour of structural concrete and the productivity of concrete supply and placing on site in later years. He is an experienced supervisor of research in concrete and in other fields. He is also a panel member and a Specialist Referee of the Research Grants Council. Mr Siu Long KOO is a Civil Engineering Graduate in the Works Group of Departments, Hong Kong Government and a research student in the Concrete Technology Group, Hong Kong Polytechnic University. His research topic focuses on the development and study of very high strength concrete (VHSC). zv106 INTRODUCTION In a major financial centre like Hong Kong, construction of high-rise buildings using in situ high strength concrete (HSC) is becoming popular owing to the attractive economic advantages [1]. In 1990, HSC of grade 60 was used for the first time in the construction of the Central Plaza. In 1995, grade 100 concrete was used for the re-development of City Plaza in Tai Koo Shing.
