Recycled aggregates produced with a new technology from fresh returned concrete were used to produce new concrete, by replacing hundred per cent of natural aggregates. The new concrete was tested for internal sulphate attack (ISA) by long term durability test including several weathering cycles simulating the typical conditions of exposure of concrete pavements. A reference concrete with the same dosage of cement and w/c made with natural aggregates was used as comparison. Dynamic elastic modulus (DEM) measurements indicated that no mechanical deterioration of both the concretes was observed at the end of the test. X-ray powder diffraction (XRPD) analyses confirmed that the concrete with the new aggregates and that with natural aggregates behaved similarly to ISA . Scanning electron microscope (SEM) analysis showed that the microstructure of concrete made with the new aggregates were less affected by the aging cycles at the end of the test, compared to concrete made with natural aggregates. The results of the present work confirmed that recycled aggregates produced from returned concrete with the new technology can be used to produce durable concrete.
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