By Oleg Dvorkin, Leonid Dvorkin
There are enlightened simple 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 make sure concrete function reliability and sturdiness. There are thought of easy forms of general weight cement concrete, light-weight and mobile concrete, non-cement mineral binders concrete, mortars.
The publication is addressed to scholars and post-graduate scholars of development specialties of upper academic institutions, scientists and technologists.
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Additional resources for Basics of Concrete Science
Mixing water Mixing water is an active component providing hardening of cement paste and necessary workability of concrete mix. 5 is recommended for making concrete. High content of harmful compounds (chloride and sulphate, silt or suspended particles) in water retards the setting and hardening of cement. ) can also reduce the rate of hydration processes and concrete strength. Magnetic and ultrasonic processing has an activating influence on mixing water as shown by many researchers. 38 A B Fig.
McMillan (USA) had set the rule of constancy of water quantity (RCW). It was found that at unchanging water quantity the change of cement quantity within the limits of 200-400 kg/m3 does not influence substantially on workability of concrete mixtures. 47 W, kg/m3 C/W Fig. 7. 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).
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. 1. 2. Plane section of tricalcium silicate (C3S) structure 56 High hydration activity of aluminates minerals is caused by possibility of structural transformations due to the instability of the concentration of Al3+ ions in the crystalline grate of these minerals.