Study of the mechanical properties of recycled cement kiln dust with sand as an alkaline activator in the manufacturing of heat-treated granulated blast furnace slag mortar

Abstract

Recyclingand  using  it as a  activator for with  is an innovative solution for utilizing industrial waste to produce sustainable building materials.  was used as an activator for  with  in the studied samples by partially replacing the  and  with in different ratios. The first sample  was , the second sample was , and the third sample was . The samples were prepared withof  and pressed using a cylindrical hydraulic press  They were then stored in a  environment. The hardened and cured samples were studied under high pressure and high temperature conditions to accelerate the reaction time. was identified by studying its mechanical properties and determining the compressive strength values ​​at various times. Selected for thermal hydrate reaction. The results showed that the best relative composition of the building material products was in the second sample, which had strong mechanical properties and produced the highest compressive strength values ​​at the reaction times.

The reason for the high values ​​in the second sample is attributed to the increased proportion of  at the expense of  and , and the increased activity in the hydrate reaction through the use of  as an activator, which led to an increase in the quantity of  with . The lowest values ​​were recorded in the third sample due to two reasons: the increased quantity of  at the expense of  and,  and the production of  large quantities of  and  with very weak hydraulic properties  diffraction results for the phase composition of the resulting materials confirmed the compressive strength measurements.