There is clearly a pressing need for a binder that can function in the same way as OPC but one that does not emit the same amount of CO2 under production. The RELO binder, described in this report, is such a binder: RELO concrete has a CO2 emission that is 53% less than that of conventional OPC based concrete and has been used to manufacture paving stones with compressive strengths of over 30 MPa and splitting strengths of approximately 5 MPa.
This report describes the development of the RELO binder which uses a number of waste/recycled materials to achieve a low CO2 emission. Tests carried out to EN standards on concretes manufactured using the new binder are described as well as how the new binder has been employed to manufacture paving stones under industrial conditions. The report also identifies a range of other cement-based products that could potentially be manufactured using the RELO binder.
The report also includes suggestions for further material and process developments which, if implemented, could result in a material with even better properties than the RELO binder.