Producing durable concrete for required structural service life in the working environment involves consideration of many interrelated factors at various stages in the design and construction process. This is a very complex task in the field of concrete technology and demands a high level of expertise which is only available in a limited number of research centres. A knowledge-based expert system, CONEX, has been developed to assist with this task and is described in the paper. The system is designed to select and proportion concrete mix constituents for particular durability requirements using a series of mathematical models and provide an estimation of service life for particular environments. The models have been developed from experiential knowledge gained from 15 years laboratory data. The system is intended to act as an intelligent and automated assistant to consultants and engineers in their daily tasks.

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