In this paper the effect of metakaolin addition on the concrete properties is investigated. Metakaolin, produced by controlled thermal treatment of kaolin, can be used as a concrete constituent, since it has pozzolanic properties. A poor Greek kaolin has been thermally treated at defined conditions and the produced metakaolin had been superfine ground. In addition, a commercial metakaolin of high purity has been used. Five mixture proportions were used to produce high performance concrete, where metakaolin replaced an amount of the cement. The properties of the fresh concrete, the strength development and some properties concerning the concrete durability - chloride permeability, air permeability, sorptivity and porosity – have been studied. It is concluded that the produced metakaolin as well as the commercial one indicate a similar behavior concerning the strength development and the durability and lead to concrete production with an excellent performance.

  • INTRODUCTION

  • EXPERIMENTAL

  • RESULTS AND DISCUSSION

  • CONCLUSIONS

  • REFERENCES

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