By Oleg Dvorkin, Leonid Dvorkin
There are enlightened easy points of clinical concrete technology. there's given precis of recent principles approximately hardening and structure-forming of cement stone and urban, rheological and technological houses of concrete mixes, power, pressure and different houses, which make certain concrete function reliability and sturdiness. There are thought of uncomplicated different types of common 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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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. All clinker minerals are disposed in a row concordant with their hydration activity: tricalcium aluminate (C3A) – tetracalcium aluminoferrite (C4AF) - tricalcium silicate (C3S) - β dicalcium silicate (β- 2CaO⋅SiO2). 3. Structure of elementary cell of crystalline structure of tricalcium aluminate (C3A) 57 The rate of reaction between cement and water is accelerated if there is increasing in temperature, that is characteristic for all chemical reactions.
Average diameter of a typical fly ash particle is 5 to 100 µm. Chemical composition of fly ash corresponds to composition of a mineral phase of burning fuel (coal). Silica fume is an highly active mineral admixture for concrete which is widely used in recent years. Silica fume is an ultrafine byproduct of production of ferrosilicon or silicon metal and contains particles of the spherical form with average diameter 0,1µm. The specific surface is from 15 to 25 m2/kg and above; bulk density is from 150 to 250 kg/m3.
Chemical composition of fly ash corresponds to composition of a mineral phase of burning fuel (coal). Silica fume is an highly active mineral admixture for concrete which is widely used in recent years. Silica fume is an ultrafine byproduct of production of ferrosilicon or silicon metal and contains particles of the spherical form with average diameter 0,1µm. The specific surface is from 15 to 25 m2/kg and above; bulk density is from 150 to 250 kg/m3. The chemical composition contains basically amorphous silica which quantity usually exceeds 85 and reaches 98 %.
Basics of Concrete Science by Oleg Dvorkin, Leonid Dvorkin