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. Relationships between various mechanical properties of High Strength Concrete made with Fly Ash with strengths of up to 85 MPa are discussed, as well as the strengthening behaviour of interface between matrix and the coarse aggregates as observed from Scanning Electron Microscope. Two types of fly ash which come from different Power Plants were used, with their chemical composition differing slightly. The results show that equal effects independent of fly ash source could be reached by modifying the percentages of fly ash replacement and their specific surface areas. The result will be useful for concrete manufactures as well as for scientists working in the field of Concrete Technology. Keywords: Carbonation, Chemical composition, Density, High Performance Concrete (HPC), Fly Ash Suralaya (FAS), Fly Ash Paiton (FAP), Specific Surface Area (SSA), Scanning Electron Microscope (SEM), Lubricating effect. Professor Dr M Sahari Besari is dean of the Faculty Civil Engineering and Planning, Institut Teknologi Bandung (ITB), Bandung, Indonesia. He specialises in the Numerical Modelling and Structural Repair in Steel and Concrete Structures. Dr Dicky R Munaf is Head of Structures and Materials Laboratory, Dept Civil Engineering, ITB, Indonesia. His interests include the Strengthening and Crack Density Analysis in Interface Zone of High Performance Fly Ash Concrete. Hanafiah is a PhD candidate of Department of Civil Engineering, Institut Teknologi Bandung (ITB). His main research is Constitutive Model for High Strength Fly Ash Concrete. He is lecturer in University of Sriwijaya, Palembang, Indonesia. Maulid M Iqbal is a PhD candidate of Department of Civil Engineering, ITB. His main research is Confinement Effect of High Performance Fly Concrete. He is lecturer in University of Sriwijaya, Palembang, Indonesia. INTRODUCTION Fly ash is currently accepted as suitable cement supplementary material for the production of High Performance Concrete mixes. This material is commonly the byproduct of coal firing in the industry and possesses cementitious and pozzolanic properties and can be used to strengthen the interface zone beetwen the matrix and coarse aggregates, also to increase the impermeability of concrete to environment influence.
