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SYNTHESIS OF LOW-BASE CALCIUM SILICATES IN CONCRETE MODIFIED BY MICRODISPERSED SAPONITE-CONTAINING COMPONENT
Abstract
It was found that the mechanically activated highly dispersed component based on saponite-containing waste of the diamond industry allows us to improve the physicomechanical characteristics of fine-grained concrete due to the formation of hydrosilicates of additional generation. According to the working hypothesis, the resulting new formations are submicrocrystals of the tobermorite group. The objective of this study was to identify the products of the hydration of clinker minerals with a component on the basis of the saponite-containing material in the micro- and nano-dispersed state. Differential-thermal and X-ray phase analyzes were performed to identify these products. The data obtained showed that the experimental samples with highly dispersed saponite-containing material differ from the control samples by their mineralogical composition. So in the prototype sample there are hydrate formations, the greatest intensity of which is fixed from 28 to 48 2?, with interplanar distances 3.03; 2.76; 2.43; 2.14 A, characterizing the lattice of tobermorite. Differential thermal analysis confirmed the obtained results. Endoeffect in the temperature range from 205 to 220 ?, which also characterizes the presence of submicrocrystals. In continuation of the research, a comparative analysis of the microstructure of the samples was carried out. The formations of acicular and hairlike crystals - characteristic of tobermorite were shown.
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