Effect of Calcined Red-Beds on Mechanical Properties of Mortar
With the acceleration of infrastructure construction,a large amount of excavation waste red-beds have been produced.Red-beds contain a large amount of clay minerals,which makes the red-beds have the potential to be used as supplementary cementitious materials after calcination.The reuse of waste red-beds helps to alleviate the high energy consumption and pollution in the cement production process,as well as the problems caused by waste red-beds accumulation.In this study,the red-beds are calcined at different temper-atures,and the effects of calcination temperature on the microstructure and pozzolanic activity of the red-beds are analyzed.At the same time,the uniaxial compressive strength test of calcined red-beds mortar with differ-ent replacement ratios is carried out,and the influence of the replacement ratio on the mechanical properties of mortar is analyzed.The results show that the optimum calcination temperature of red-beds is 800 ℃;the com-posite mortar meets the strength requirements,and the addition of the calcined red-beds reduces the brittleness of mortar and improves its stiffness and stability.
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