BASICS OF CONCRETE SCIENCE - CHAPTER 10 pptx

... to 20 MPа. Concrete strength at application of composite gypsum-cement-pozzolanic and gypsum-slag-cement- pozzolanic binders on the basis of alabaster is 7. 5-2 0 MPa, on the basis of alpha gypsum ... К=1.4; C - cement content. 187 10. 1. Silicate concrete Along with concrete on the basis of Portland cement and high-alumina cement there are used different concrete on...

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... SnO 2 BeO - - - - - MgO - - - - CaO ++ ++ ++ ++ ++ ++ ++ ZnO - - - SrO ++ ++ ++ + + + + CdO - - - - - BaO ++ ++ ++ ++ ++ ++ ++ Note: fixed (++) and predicted (+) existence of binding ... of uniform dist ribution of entrained-air voids in concrete structure Accelerator of setting time Shorten the time of setting Ac...

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... strength (R cmp ): 1 - R f of sand concrete, 2 - R f of ordinary concrete, 3 – R t of sand concrete R t , R f , МПа R cmp , МПа 10 20 30 40 50 60 70 80 90 100 10 9 8 7 6 ... fine-grained concrete, high-strength concrete, concrete, modified by polymer admixtures and fiber reinforced concrete, concrete for special purposes – hydrotechnical, high...

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... manuscript of book of Doct. of Tech. Science, Prof. L. Dvorkin and Doct. of Tech. Science O. Dvorkin Basics of Concrete Science By now concrete science became one of the fundamental material sciences, ... manuscript of book of Doct. of Tech. Science, Prof. L. Dvorkin and Doct. of Tech. Science O. Dvorkin Basics of Concrete Science Basically conc...

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... index of degree equal 0,1 to 1). 46 2.2. Technological properties of concrete mixtures Fig. 2.6. Chart of methods of determination of structural- mechanical properties (workability) of concrete ... frequency of vibrations. 42 Fig. 2.1. Change of viscidly-plastic properties of concrete mixture depending on tensions: a – change of structural viscosity; b – change o...

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... CH 2 CH 2 H 2 C H 2 C OH 20 10 -1 0 m 1.1 10 -1 0 m Fig.3.12. Adsorbed layer of surface-active substance at the surface of a solid 56 Fig.3.1. Rate of reaction of the calcium hydroxide Ca(OH) 2 ... forming Influence of chemical admixtures Fig.3 .10. Kinetics of change of level of hydration of cement silicate phase: 1- without admixtures; 2- calc...

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... ,kdd/Е 2/1 срср − =ν=σ where - tensile stress; E- modulus of elasticity; - effective energy of destruction; d as - average size of a crystal; ( ) 2/1 Ek − ν= - coefficient of viscidity of destruction. Strength of concrete ... strength of concrete; k – strength coefficient, A – constant value, x – ratio between volume of water and volume of cement. Graf of...

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... deformation of shrinkage. 89 On the idealized chart of compression of cement stone it is possible to select three basic areas: a-b- absence of cracks in the structure of cement stone; b- c- appearance ... watertightness of concrete. Amount of shrinkage of cement paste and concrete depends on age of hardening, composition, specific surface and quantity of cement, q...

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... water-cement ratio of the cement stone Capillary porosity, % Water-cement ratio Coefficient of filtration K f 10 -1 1 , cm/sec Coefficient of filtration K f 10 -1 2 , cm/sec 110 Air-entraining ... expansion. 109 Fig.6.2. Relationship between frost resistance and water-cement ratio (W/C) of concrete: 1 – Air-entrained concrete; 2 - Non-air-entrained concre...

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... equality of volume of the concrete mix to the sum of absolute volumes of the initial components of concrete, the second - conformity of volume of the cement - sandy paste (mortar) to volume of voids ... depending on quantity of the cement stone in concrete. Fig. 7.2. Effect of quantity of the cement stone in concrete on the value of creep: 1 – C...

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