Construction material energetic usefulness increasement peculiarities and its importance

Abstract

Extractive hemihydrate phosphogypsum taken directly from the waste disposal conveyer was used for the investigation. The phosphogypsum, Portland cement and opoka mixture was prepared by using the mechanical activation method. The obtained formation mass was used for formation of specimens by vibration and casting methods. The conducted experiments showed the possibility to reprocess phosphogypsum into a high-quality modified gypsum binding materials by using a centrifugal impact mechanical activation method, which allows to save the accumulated chemical waste energy. Activated phosphogypsum without additives distinquishes itself by very quick hardening, due to which there is no time left for further reprocessing operations, its compressive strength is lower than that for gypsum cement specimens. Portland cement and opoka mixture can effectively neutralize the phosphogypsum acidic admixtures and retard its binding and hardening duration. The compressive strength of gypsum cement specimens reached 22 MPa formed by vibration method and 17.5 MPa by casting.