Open AccessCEMENT STONE STRUCTURE COMPACTION WITH COMPOSITE BINDER
Author(s) -
Федюк Роман Сергеевич,
Баранов Андрей Вячеславович,
Хроменок Даниил Владиславович,
Зеленский Илья Романович,
Ким Семен Вячеславович
Publication year - 2019
Publication title -
vestnik tomskogo gosudarstvennogo arhitekturno-stroitelʹnogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2310-0044
pISSN - 1607-1859
DOI - 10.31675/1607-1859-2019-21-3-195-206
Subject(s) - portlandite , portland cement , cement , alite , materials science , compaction , quartz , clinker (cement) , calcium hydroxide , pozzolanic reaction , composite number , microstructure , composite material , mineralogy , chemical engineering , pozzolan , geology , engineering
The aim of the paper is to improve the strength properties of cement stone via control for structure formation. The composite binder composition includes the type CEM I 42.5N (58–70%) Portland cement, active silica additive (25–37%), quartz sand (2.5–7.5%) and limestone crushed waste (2.5–7.5%). The optimum technology of mechanochemical activation is proposed for the cement stone. The optimization of the structure formation process is provided by the mineral-mineral modifier, crushed together with Portland cement in a planetary mill to a specific surface of 550 m2/kg. The amorphous phase of silicon dioxide in the composition of the modifier intensifies the calcium hydroxide binding forming during alite hydration. It contributes to the growth in low-basic calcium silicate and lowers the cement stone basicity, while reducing the amount of portlandite. The crystalline phase of β-quartz silicon dioxide plays the role of crystallization centers new formations and the cement stone microstructure compaction. Limestone particles contribute to the formation of calcium hydrocarbonate and act as a microfiller together with fine ground quartz sand clogging the pores in the cement stone.