Abstract
The results of research of activity enhancement of natural siliceous raw material are given in the article. Fossil meal of Khotynetsky deposit, diatomite of Sharlovsky deposit, silica clay of Balasheika deposit were used as natural active mineral admixtures. The influence of heat-treating temperature and dispersion on activity of different types of siliceous raw material is studied. The increase of activity of fixation of Ca(OH) 2 in several times is traced after heat-treating at a certain temperature in the range from 100 to 800°C. The type of activity change is discovered. Explanation is given connected with the change of silica structure in the surface layer. Parameters of the highest activity are defined for every type of siliceous raw material.
Highlights
In the structure of many cementing, first of all portland pozzolan cement and limestone pozzolan cementing concretes are present active mineral admixtures (AMA) [1 - 3]
When maturing AMA adsorb at first, and chemically fix Са(ОН)2, received from interaction of alite with water into solventless hydrated calcium silicate according to reaction: mCa(OH)2 + SiO2(act.) + nH2O o (0,8-1,5)CaOSiO2pH2O
The amount of AMA in the structure of cementing depends on mineral composition of cementing and activity of the admixture
Summary
In the structure of many cementing, first of all portland pozzolan cement and limestone pozzolan cementing concretes are present active mineral admixtures (AMA) [1 - 3]. When maturing AMA adsorb at first, and chemically fix Са(ОН), received from interaction of alite with water into solventless hydrated calcium silicate according to reaction: mCa(OH)2 + SiO2(act.) + nH2O o (0,8-1,5)CaOSiO2pH2O (1). This process happens under usual conditions of cementing: moist environment with positive temperatures. The activity amounts of different admixtures of natural and artificial origin which are given in table 1 are known As it is seen from table 1 the highest activity is with silica wastes, and from natural ones with natural siliceous raw material. Taking into consideration the spread of natural siliceous raw material and resourcesaving approach to the raw-material base of construction industry [12] a goal was set: to study the influence of heat-treating temperature on activity of natural siliceous raw material of different dispersion
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
