Abstract
For over 60 years technological additives used in process of grinding cement. Application of cement grinding aids can improve performance of ball mills, reduce specific energy consumption, and increase fluidity of cement during transportation and processing. Construction practice is characterized currently emergence and increasing use of so-called high-tech (effective) a new generation of concrete, suggesting the use of high quality cement. In work presents results of impact intensifiers on the grindability of cement based on different mineralogical composition of clinker. Offers original methodology for assessing of indicators intensifiers action on grinding process and qualitative characteristics of cement. Knowing positive and negative sides of each constituent component it is possible to try selection of compositions intensifiers with synergies effect considering mineralogical composition of clinker and material composition of cement. The presence of modifying component allows not only render intensifying effect in milling process, but to increase both early and late strength due to the formation of more dense and homogeneous structure of cement stone. It is shown that intensifiers with modifying additives allow not only affect on grinding process, but also on the process of hydration and morphology crystal hydrates, strength characteristics. In process of work we had determined, that among researched additives for two different cements, which differ from each other mineralogical composition, best results were obtained with used AI8 intensifier.
Highlights
Recently appearance a new generation of additives to improve the quality characteristics of cement (Samner, 2008)
Depending at type modifying additive early strength of some samples increased by 5-10%
The use of additives AI13-20 and AI13-40 had negatively impact on set of early strength, ultimate strength was comparable with strength of control composition
Summary
Recently appearance a new generation of additives to improve the quality characteristics of cement (Samner, 2008). Considering that main component of concrete is a cement, that optimization of particle size cement composition, and control speed of its hydration, amount and properties of the liquid phase (Unland, 2003), structural morphology of formed crystal hydrates possible already at stage of grinding cement with using surfactants (Jankovic et all., 2004). Based on these assumptions, we are carrying out research on development of composite processing aids with functions grinding aids and modifiers gripes and hardening of cement (Ghosh, 2003). The introduction of modifying additives on stage of grinding enables solve one of difficult in technological plan problems modifying composition systems - uniform distribution of additives at low concentrations in their environment polyfractional dispersed material (Perez et al, 2007)
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