ANALYSIS OF POZZOLANIC ACTIVITY OF FINELY DISPERSED CONSTRUCTION CERAMIC WASTE. PART 1: DIRECT METHODS OF DETERMINATION

The article presents a study of the effectiveness and rationality of using finely dispersed construction ceramic waste as a component of a complex binder. The features of construction ceramic waste as a secondary raw material for the production of composite materials are considered. The types of pozzolan additives, the nature of their interaction with cement or lime binders, and methods for evaluating pozzolan activity are analyzed. During operation, the construction ceramic waste was ground in a ball mill for 1-16 hours, the kinetics of grinding was studied and the dispersion analysis of the obtained pow-ders was carried out. Direct methods such as X-ray diffraction analysis and the Chappell method were used to determine pozzolanic activity. It has been established that finely ground construction ceramic waste has pozzolanic activity comparable to other pozzolanic additives (microsilica, fly ash, blast furnace slag, rice husk ash). Using the Chappell method, it was established that 1 g of ceramic powder with Ssp = 9440 cm2/g absorbs 157 mg of calcium hydroxide (Ca(OH)2). This allows us to conclude that finely dispersed waste from construction ceramics can potentially be used as an active mineral additive that strengthens the structure of cement stone, reduces efflorescence and increases resistance to leaching.