FEATURES OF WHITE PORTLAND CEMENT STRUCTURE FORMATION IN THE PRESENCE OF CARBONATE ADDITIVES

Abstract

cement, nano-CaCO3 dispersion, finely ground limestone) and features of structure formation processes of investigated compositions by means of physicochemical test methods, which included X-ray phase analysis and electron scanning microscopy, were also determined. Mechanical characteristics of the original white cement and compositions based on it with the addition of various types of carbonate additives to the composition when mixed with water together with polycarboxylate plasticizer. The paper considers the peculiarities of the process of structure formation of white Portland cement modified with carbonate additives of different dispersion (micro- and nanolevel) in the presence of polycarboxylate plasticizer and established the feasibility of their adddition to ensure the best conditions of artificial stone strength synthesis and saving it in a long time. The introduction of white Portland cement nanocarbonate additives, both in powder and dispersion, in the late stages of curing leads to their binding into thermodynamically stable compounds such as scoutite, which will ensure stability over time, not only strength but also other performance properties obtained materials based on them. Given the peculiarities of the technology of introduction of additives, the modification of white cement with nanocarbonate dispersion can be used in the manufacture of decorative mortars and concretes, and the modification of the nanoadditives in powder form is better suited for dry construction mixtures.