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Waste rocks resulting from phosphate mining extraction operations are characterized by a mix of lithological formations variety occurring within the phosphate sequence. Among this variety of co-products, flint is omnipresent in important quantities and considered as waste. This study investigates the feasibility of using flint as full aggregate replacement of natural gravel in concrete mixes. Several tests were carried out to determine their physical, chemical, mineralogical properties and mechanical performances according to European standard for concrete.

Flint aggregates consist mainly of quartz and traces of dolomite and fluorapatite. Their geotechnical and physical properties are similar to natural aggregates used for concrete. Dry and wet abrasion values measured by Los Angeles and Micro-Deval tests are respectively 19 and 9.8. Flint-based concrete was prepared alongside a control concrete made of natural …