BASICS OF CONCRETE SCIENCE - CHAPTER 0 pdf

... 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...

Ngày tải lên: 09/08/2014, 14:21

... of α at water-cement ratio Cement content, kg/m 3 0. 3 0. 4 0. 5 0. 6 0. 7 0. 8 2 50 – – – 1.26 1.32 1.38 300 – – 1.3 1.36 1.42 – 3 50 – 1.32 1.38 1.44 – – 400 1.31 1.4 1.45 – – – 500 1.44 1.52 ... (gravel) 0 Sand 0 0. 64 0. 6 0. 57 Crushed stone (gravel) 0 Sand 3 0. 61 0. 56 0. 53 Crushed stone (gravel) 1 Sand 3 0. 58 0. 53 0. 5 Crushed stone (g...

Ngày tải lên: 09/08/2014, 14:21

... SnO 2 BeO - - - - - MgO - - - - CaO ++ ++ ++ ++ ++ ++ ++ ZnO - - - SrO ++ ++ ++ + + + + CdO - - - - - BaO ++ ++ ++ ++ ++ ++ ++ Note: fixed (++) and predicted (+) existence of binding ... range, %: Са - 63 66 MgO- 0. 5 5 SiO 2 - 22 24 SO 3 - 0. 3 1 Al 2 O 3 - 4 8 Na 2 O+K 2 O- 0. 4 1 Fe 2 O 3 - 2 4 TiO...

Ngày tải lên: 09/08/2014, 14:21

... quantity the change of cement quantity within the limits of 20 0- 4 00 kg/m 3 does not influence substantially on workability of concrete mixtures. 50 Correction of parameters of aggregates by mixing, ... () D d А 100 АУ −+= (2.8) Bolomey n D 100 У d       = (2.9) Gummel In formulas (2. 7-2 .9): d – size of particles of the given fraction of...

Ngày tải lên: 09/08/2014, 14:21

... 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 ... forming Influence of chemical admixtures Fig.3. 10. Kinetics of change of level of hydration of cement silicate phase: 1- without admixtures; 2- calcium ni...

Ngày tải lên: 09/08/2014, 14:21

... ,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...

Ngày tải lên: 09/08/2014, 14:21

... 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...

Ngày tải lên: 09/08/2014, 14:21

... 1 50) , 2 class - large frost resistance (F =1 50 to 300 ), 3 class - high frost resistance (F= 300 to 500 ), 4 class - especially high frost resistance (F> 500 ). All methods of definition of ... temperature of freezing of water in concrete depends on the sizes of capillaries. For example, in capillaries 1,57 mm in diameter water freezes at -6 ,4 0 C; 0...

Ngày tải lên: 09/08/2014, 14:21

... 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 ... Zone of variable level at climate conditions: very severe 0. 42 0. 47 0. 45 0. 48 severe 0. 45 0. 50 0.47 0. 52 moderate 0. 50 0.55 0. 55 0. 58 Un...

Ngày tải lên: 09/08/2014, 14:21

... Structural-heat insulating 50 0- 1 400 3. 5-1 0 0.1 7 -0 . 40 For enclosing structures Structural 1 40 0- 1 800 1 5-5 0 0.5 8 -0 .4 For load-carrying structures 173 Fig. 9.1 Effect of bulk density of aggregate ... density of expanded clay gravel, kg/m 3 : 7 – 300 ; 8 – 400 ; 9 – 5 ; 10 – 600 ; 11 – 700 ; 12 - 800 Compressive strength of ex p anded...

Ngày tải lên: 09/08/2014, 14:21