Heat-insulation structural masonry admixture based on light filler

FIELD: construction.

SUBSTANCE: heat-insulation structural masonry admixture based on a light filler contains, kg/m3: portland cement CEM1-42.5N 173-346, quartz sand from Razumenskoe deposit 700-1260, hollow microspheres of Novocherkasskaya regional power station 50-250, a water-retention additive Mecellose FMC 24502 0.1% of the portland cement mass, water - balance, besides, percentage content of light filler - specified microspheres - is given from the volume of sand.

EFFECT: reduced heat conductivity.

1 ex, 3 tbl

 

Insulation-structural masonry mixture relates to building materials and can be used in the construction of buildings and structures, using as the main wall material of the heat insulating structural purposes.

It is known to use insulation-structural masonry mixture to use as a lightweight fill material, such as fly ash (A.S. No. 1819875; IPC C04B 38/08; publ.: 07.06.1993), expanded perlite (U.S. Pat. Of the Russian Federation No. 2394006; IPC C04B 38/08, C04B 38/10, C04B 24/24; publ.: 10.07.2010), pore-forming - aluminum powder (U.S. Pat. Of the Russian Federation No. 2130442; IPC C04B 38/02, E04F 15/02, E04B 1/74; publ.: 20.05.1999).

The disadvantages of these compounds are low limits of compressive strength with a high thermal conductivity and average density of lightweight concrete.

The closest technical solution to the claimed invention taken as a prototype, is a mix for the production of lightweight concrete, including cement, hollow microspheres, fly ash and water, contains as hollow microspheres, hollow microspheres, a component of ash and slag mixtures - waste plant in the following ratio, wt.%: cement 25,4-30,9, fly ash 6,2-13,1, these microspheres 35,3-41,1, water - the rest [U.S. Pat. Of the Russian Federation No. 2154619, IPC C04B 38/08]. The disadvantages of the known composition are also low thermal conductivity that does not sufficiently meet loraet the requirements of SNiP 23-02-2003 to walling.

The problem solved by the invention consists in reducing thermal conductivity, which contributes to the expanding Arsenal of technical means for the production of the specified mortar mixes, as well as reduce labor costs.

The technical result obtained by carrying out the invention, consists in the realization of the potential of the applied mixture of hollow microspheres and sand in the joint work of the composite. The introduction of microspheres in cement mortar, when replacing only parts of sand by volume, allows you to create a strong framework on micro and macro level, which, ultimately, increases the durability of masonry mortar. The introduction of microspheres also reduces thermal conductivity of masonry mortars.

The technical result is achieved in that the insulating-structural masonry mixture on the basis of a lightweight fill material comprises Portland cement CEM-N, hollow microspheres Novocherkasskaya GRES, water-retaining additive Mecellose FMC 24502, quartz sand of Razumensky origin and water. The percentage of lightweight fill material varies not by weight of Portland cement and the volume of sand, in the following ratio of components, kg/m3:

microspheres
cement173-346
the sand1260-700
50-250
water-retaining additive Mecellose0.1% of the cement weight
waterrest

Characteristics of raw materials

1. The cement.

Cement CEM 42,5N GOST 31108-2003 JSC "Belgorod cement".

2. A placeholder.

Quartz sand Razumensky (Belgorod region). Chemical composition shown in table 1.

Table 1
The chemical composition of silica raw materials
Name of raw materialChemical composition:
SiO2Al2O3SO3Fe2O3CaOMgOK2O+Na2OPPP
Quartz sand Razumensky (Belgorod region)93,020,920,020,980,62 0,080,460,86

3. Microspheres - component ash mixtures - waste Novocherkasskaya GRES allocated flotation reagent-free from ash mixtures GRES. Is a fine crystalline non-caking material grey color. The form of granules, spherical, surface smooth, shining.

The density of the shell - 2490 kg/m3

The average density of the granules is 580 kg/m3

The bulk density of 380 kg/m3

The diameter of 20-200 microns

The thickness of the shell - 5-15 microns

The conductivity of 0.11-0,125 W/(m·K)

Compressive strength cylinder 1.8 MPa

4. Water-retaining additive methyl cellulose (table 2)

Table 2
The characteristics of key productsAppearance (20-25°C)Density at 20°C, kg/m3tKinematics - Kai viscosity at 20°C, m2/s(pH), within thePour point, °C, not above
Mecellose FMC 24502The fine white powder1290-1310507,0-10,0 -10°C

Example. For experimental verification of the proposed structure were made standard samples with various proportions of the above components.

The samples were produced as follows. Pre-mixed components in the dry state (cement, sand, microsphere) in the appropriate proportions, based on the standard sample size 4×4×16 see Mixing the dry mixture was carried out for 2 minutes in Parallel in a pre-measured amount of water was added water retention additive under continuous stirring, the temperature of the water should be in the range of 1-20°C. Next, the mixture was added to the prepared water was prepared and carried out their joint stirring for 2 minutes Then were forming within 1.5 minutes, the Samples were placed into the chamber of the natural setting and was kept there for 28 days. The compositions of the easy solution is presented in table 3.

The compositions and properties of thermal insulation-structural masonry mortar

0,173
Table 3
The listPhysico-mechanical characteristics
No.Cement, to the/m 3Sand, kg/m3Microspheres, kg/m3Water retention additive, kg/m3Water, kg/m3Adjusted they conductivity (λ), W/m·KStrength, MPaEnvironments latter tightly the terrain, kg/m3
11737002100,1731730,1562,11083
21731260500,1731730,2236,031552,2
317311201000,1731750,1715,111463
41739801501780,1914,321374,2
51738402000,1731790,1583,661284,6
61737002500,1731830,1463,101196,2
72591260500,2592600,2347,121673
825911201000,2592650,1856,031585
9259980 1500,2592680,2015,101496,2
102598402000,2592800,1864,321411
112597002500,2592860,2113,661323,4
123461260500,3463520,2428,401798,8
1334611201000,3463590,1727,111711,6
14346 9801500,3463720,216,021626,8
153468402000,3463780,285,101539,2
163467002500,346385to 0.2634,321452
This is known
Cement, %The fly ash, %Microspheres, %Vocoder living Supplement, %Water %Adjusted they conductivity (λ), W/m·KStrength, MPaEnvironments-average density, kg/m3
1624,4the 13.441,5 -20,70,17513,6865

From the table it follows that light insulation-structural solution proposed composition has low heat conductivity.

Insulation-structural masonry mixture on the basis of a lightweight fill material comprising Portland cement CEM-N, hollow microspheres Novocherkasskaya GRES, water-retaining additive Mecellose FMC 24502, quartz sand of Razumensky origin and water, characterized in that the percentage of lung filler varies not by weight of Portland cement and the volume of sand, in the following ratio of components, kg/m3:

Portland CEM-N173-346
quartz sand of Razumensky field700-1260
microspheres Novocherkasskaya GRES50-250
water-retaining additive Mecellose FMC 245020.1% of the cement weight
waterrest



 

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