By Oleg Dvorkin, Leonid Dvorkin
There are enlightened uncomplicated facets of medical concrete technology. there's given precis of contemporary rules approximately hardening and structure-forming of cement stone and urban, rheological and technological houses of concrete mixes, power, pressure and different homes, which be certain concrete function reliability and sturdiness. There are thought of easy kinds of basic weight cement concrete, light-weight and mobile concrete, non-cement mineral binders concrete, mortars.
The ebook is addressed to scholars and post-graduate scholars of development specialties of upper academic institutions, scientists and technologists.
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Additional info for Basics of Concrete Science
3 – slump of concrete mixtures: 10, 5, 2 sm. st – coefficients of moistening of fine and coarse aggregates; S and St – accordingly quantities of sand and coarse aggregate, kg/m3 48 Application of aggregates substantially multiplies the water content of concrete mixtures, necessary for achievement of the set mobility (workability). 0,5 (in Gummel's formula index of degree equal 0,1 to 1). 10) where R – the required value of the corrected parameter (fineness modulus of aggregate, specific surface, quantity of aggregate of definite fraction); P1 and P2 – values of the corrected parameter of aggregate accordingly with large and less its value; n –volume content of aggregate with the less value of the given parameter in the sum of volumes of the aggregates mixed up.
Physical and chemical processes of structure formation of cement paste make substantial influence on concrete hardening. Concrete hardening and forming of concrete properties depend greatly on the mixing water, aggregates and admixtures used. 1. Hardening and structure of cement stone Hydration of cement A chemical process of cement hardening is the processes of hydration which occurs at mixing cement with water. Composition of new compounds is determined by chemical nature of waterless compounds, ratio between solid and liquid phase, temperature conditions.
3. 10. 12. Adsorbed layer of surface-active substance at the surface of a solid Fig. 11.