Composition of haydite-concrete mixture

FIELD: construction.

SUBSTANCE: composition of a haydite-concrete mixture includes, wt %: portland cement 18.87-21.34, haydite 41.13-41.56, superplasticiser LSTM 0.0312, fly ash of TPP 13.92-18.87, gasifying additive PAK-3 0.022-0.025, water - balance.

EFFECT: production of haydite concrete with higher strength and reduced density.

3 tbl

 

The invention relates to the construction materials industry, in particular the production of lightweight expanded clay concrete for low-rise construction.

Famous concrete mix for the production of lightweight concrete (Patent No. 2379265, IPC C04B 38/08, publ. 20.01.2010)containing, wt.%: cement 21,0-23,0; clay 26,0-28,0; water 14,0-18,0; shungite dust 31,0-39,0.

The disadvantage of this mixture is the low strength.

Famous concrete mixture (Patent No. 2449971, C04B 38/08, publ. 10.05.2012) containing, wt.%: Portland 23,0-25,0; expanded clay fraction of 10-20 mm 4,5-5,5; clay sand 20,0-23,0; saponified rosin 0,001-0,0012; clay ground 13,0-18,0; water - the rest.

The disadvantage of this mixture is insufficient durability, increased density, reduced thermal properties.

Closest to the invention is a concrete mixture for the production of building blocks for low-rise construction (Patent # 2440943, IPC 04B 28/04, C04B 111/20, publ. 27.01.2012)comprising, wt.%: Portland 21,0-24,0; expanded clay gravel 27,0-31,0; clay sand 5,0-7,0; saponified rosin 0,001-0,0012; superplasticizer C-3 0,9-1,3; ground-glass 18,0-20,0; water - the rest.

The disadvantage of this concrete mixture is reduced strength and increased density.

The technical result is to obtain a concrete mixture with povyshen the th strength and low density.

The technical result is achieved by the fact that the composition of the concrete mixture comprising Portland cement, lightweight aggregate, superplasticizer LSTM, water, according to the invention, further comprises fly ash of thermal power plants, and gas-forming additive PACK-3 in the following ratio, wt.%:

Portland 18,87-21,34;

the clay 41,13-41,56;

superplasticizer LSTM 0,0312;

ash CHP 13,92-18,87;

razobratsya additive PAK-3 to 0.022-0.025;

water the rest.

Ash CHP is a fine powder with fineness of 2500-3000 cm2/g, a bulk density of 780 kg/m3the true density of 2300 kg/m3, humidity 17%, loss on ignition of 4.8%.

Grain composition of fly ash CHP wet removal are presented in table 1.

td align="center"> of 1.57
Table 1
Grain composition of fly ash CHP
The size of the holes of the sieve, mmPrivate residues on the sieves, %Full residues on the sieves, %
2,53,143,14
1,25of 1.574,71
0,636,28
0,3151,057,33
0,1420,427,73
less 0.1472,25of 99.98

The fineness modulus of fly ash CHP - Mkr=0,48.

The chemical composition of fly ash CHP are presented in table 2.

Table 2
The chemical composition of fly ash CHP
Name of the power plantSiO2Al2O3Fe2O3CaOFeOMgOK2OSO3SiO2+Al2O3+FeO
Kemerovo)49,118,612,8the 5.71,52,00,21,05 67,7

Ash CHP in the composition of the concrete mixture performs the role of fine aggregate and fills the emptiness of the clay. Spherulites fly ash CHP create additional closed porosity fine aggregate, reducing overall open porosity structure is an artificial construction conglomerate. Reduced open porosity leads to a decrease in water absorption of the material and to increase the strength of artificial conglomerate.

Superplasticizer LSTM is a product of wood processing pulp sulphite method carbide and water-soluble resin. Thick, viscous dark brown liquid, soluble in water. Introduction superplasticizer reduces the water requirement of a mixture of about 15% and increases the strength of concrete.

Additive PAK-3 - powder aluminum contact is a silver fine powder. It is soluble in acid and alkali solutions. Is introduced into the concrete mixture in the form of a suspension in water required for mixing concrete mixture.

Introduction to the composition of the concrete mixture gas-forming additives PAK-3 leads to the interaction of the aluminum powder with formed during the hydration of tricalcium silicate calcium hydroxide. As a result of reaction formed in dorog, which, standing out, pariset matrix of the concrete mixture and reduces the density of the concrete mixture.

With the resulting pores have an optimal structure with a uniform distribution of pores in the form of a polydisperse in size, closed, deformed in the right polyhedra with glossy surface preparepage layer, separated by a thin, but strong and of the same cross-section interporous partitions (an Additive in concrete and mortars: training Handbook / LI Kesternich. - Rostov-on-don: Phoenix, 2007).

Formed uniformly distributed pores reduce the density of the concrete mixture and increase the heat insulating ability of the concrete mixture.

Preparation of concrete mixture is performed in a forced action mixer. The clay is mixed with 30% of the water required for mixing concrete mixture in the mixer for 120 seconds, then add the ash CHP and Portland cement.

Superplasticizer LSTM and gas-forming additive PAC-3 is introduced into the rest of the water required for mixing concrete mixture, and intensively stirred. Next, water with additives injected into the mixer and stirred for 180 seconds. From ready-mix form patterns that harden 28 days.

The composition of concrete mixtures are given is in table 3.

Table 3
The composition of concrete mixtures
ComponentsContent, wt.%
Composition No. 1Composition No. 2Composition No. 3
Portland21,3419.14 per18,87
Leca41,5641,5041,13
Ash CHP13,9216,7018,87
Superplasticizer LSTM0,03120,03120,0312
Blowing0,0220,0230,025

additive PAK-3
Water is restrestrest
The strength of claydite-concrete in compression, MPanot less than 5.0not less than 5.0not less than 5.0
The placeholder
The strength of claydite-concrete in compression, MPa
not less than 3,0not less than 3,0not less than 3,0

Thus, the introduction of the concrete mixture of fly ash CHP leads to the optimization of the first space claydite-concrete, reducing large intergranular vacuum in the structural frame of claydite-concrete, while the absence of large capillary pores increases the strength of claydite-concrete. In addition, the introduction of additives PAK-3 pariset the cement matrix, in which there are small closed pores, practically does not affect the strength of claydite-concrete, but significantly reduces the density and increases the insulating properties of claydite-concrete.

The composition of the concrete mixture comprising Portland cement, lightweight aggregate, superplasticizer LSTM, water, characterized in that it further comprises fly ash of thermal power plants, and gas-forming additive PACK-3 in the following ratio to the of mponents, wt.%:

Portland18,87-21,34
Leca41,13-41,56
superplasticizer LSTM0,0312
ash CHP13,92-18,87
gas-forming additive PAK-3to 0.022-0.025
waterrest



 

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