Composite binders based on weathered quartzite sandstones of the Kursk Magnetic Anomaly

Introduction. Current problems of human life quality are taking on a global character and manifest themselves in environmental degradation and the activation of abnormal man-made and natural processes. The solution to the problem of creating comfortable human living conditions is possible through the use of new technologies and approaches; rational use of mineral raw materials, taking into account their genesis. The use of rocks specially prepared by geological processes is especially relevant.

Results. It has been established that the composition and properties of weathered quartzite sandstones have a significant effect on the structuring processes of the composite binder. Ca(OH)2, released during hydration of clinker minerals, interacts with amorphous phases of this rock to form calcium hydrosilicates of the second generation, which leads to optimization of the cement stone structure.

Conclusion. The results of scientific research indicate an improvement in the strength characteristics of composite binders based on weathered quartzite sandstone in all cases compared to binders based on unweathered quartzite sandstone. Maximal value is obtained for KV20 composite binder (with filler consumption up to 20 per cent), which is 23 per cent higher than strength characteristics for specific surface area of cement from 500 to 700 m2 /kg, with accompanying compaction of the composite material.

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