SU1680674A1 - Raw mixture for light concrete - Google Patents

Abstract

The invention relates to building materials and can be used to produce lightweight concrete and heat insulating materials. The aim of the invention is to increase the strength of the concrete and the mobility of the concrete mix. The goal is achieved by the fact that, as a modifying additive, the mixture contains sodium salt of polyethyl enpolyamino polymethylphosphonic acid in the following ratios of components, wt.%: Cement 71.39-71.42; polystyrene foam 4.23; neutralized air-entraining resin 0.08; sodium salt of polyethylene polyamino polymethylphosphonic acid 0.01-6.05; water the rest. This content of the raw mix provides a draft of the cone 4-15 cm with a compressive strength of 0.6-1.3 MPa, with a bend of 0.35-0.6 MPa. 1 tab.

Description

The invention relates to building materials and can be used to obtain lightweight concrete and heat insulating material.

The purpose of the invention is to increase the strength of concrete and increase the mobility of the concrete mix.

Raw mix for lightweight concrete as a modifying agent contains sodium salt of polyethylene polyamino polymethylphosphonic acid in the following ratios of components, wt.%:

Cement

Expanded polystyrene Resin neutralized air-entraining

Sodium salt of polyethylenepolyamine polymethylphosphonic acid Water

71.39-71.42 4.23

0.08

0.01-0.05 Else

The sodium salt of polyethylene polyamine-polymethylphosphonic acid (PAF) has the formula

cl

with

in the odermino at ntov,

71.42 4.23

0.08

-0.05 ьн

CHZ-CH2-Nc,

P ° 3 "a Jn where p 8-10.

PAF exhibits superplasticizer properties, i.e. when introduced into the concrete solution, the mobility of the mixture increases and the strength of the mixture and the strength of concrete products increase.

o The rheological and physicomechanical tests were carried out as follows.

The workability (viscosity) of the concrete mixture was determined by the cone sediment. To determine the strength characteristics of concrete, cubic specimens were molded with 10 cm ribs and 10x10x30 beams (cm). Samples were tested after curing at a temperature of 20 + 2 ° C in

about

00

about

for 28 days. Heat conductivity, water absorption, density, frost resistance, as well as the mass loss in the fire tube were determined by known methods.

The mixture for lightweight concrete was prepared in the following manner.

EXAMPLE 1 Penostirol granules (4.23 g) were mixed with a sample (71.41 g) of cement, then mixing water (24.27 g) was added with neutral resin (0.08 g) dissolved in it. - lysed air-entraining agent (SNV) and (0.03 g) sodium salt of polyethylene polyamino polymethylphosphonic acid (PAF).

The ratio of the following components, wt.

Styrofoam4,23

Cement71.40

SNV0.08

PAF0.03

Water% 24.26

Product characteristics are as follows: bulk weight 360 kg / m3, breaking stress at compression 1.3 MPa, breaking stress at bending 0.6 MPa, water absorption 3.5% by weight, taper draft 10 cm, thermal conductivity coefficient 0, 08 W / mK, frost resistance 36 cycles, mass loss in the fire tube 12-15%.

EXAMPLE 2 A raw mix is prepared in the same manner as in Example 1, with the following ratio, wt.%:

Styrofoam4,23

Cement-71.39

SNV0.08

PAF0.05

Water 24.25

The properties of the composition: volumetric mass 360 kg / m3 breaking stress at compression of 0.9 MPa, breaking stress at bending 0.4 MPa, water absorption 315 wt.%, Sediment cone 15 cm, thermal conductivity 0.08 W / mK, frost resistance 36 cycles, mass loss in the fire tube 12-14%.

Example Polystyrene granules and cement are mixed with mixing water containing START and PAF with the following content of components, wt.%:

Styrofoam4,23

Cement71,42

SNV0.08

PAF0.01

Water24.26

The properties of the composition are as follows, the bulk weight of 350 kg / ml is the breaking stress at compression of 0.8 MPa,

flexural stress at 0.4 MPa; water absorption: 4.0 wt.%; sediment cone: 4.0 cm; thermal conductivity coefficient: 0.08 W / mK; frost resistance, 35 cycles; mass loss in the fire pipe, 12-15%.

The following compositions were prepared in a similar manner.

The compositions and properties of the compositions according to examples 1-7 are given in the table.

As can be seen from the table, the introduction of sodium bean polyethylene polyamine polymethylphosphonic acid (PAF) in an amount of 0.01-0.05 wt.% Leads to an increase in the strength of the material more than fold, and an increase in the mobility of the concrete mix to 15 cm.

The remaining characteristics are maintained at a level known or slightly improved.

The optimal concentration of PAF, at which the improvement of parameters (strength, mobility of the concrete mass) is observed, is 0.01-0.05 (examples 2-6). The change in the concentration of the remaining components beyond the interval specified in the examples is impractical.

The introduction of PAF in the raw mix leads to an increase in mobility of the concrete solution. The introduction of the modifier makes it possible to mechanize the process of forming blocks (the use of a concrete pump and the exclusion of vibration when filling out forms). In addition, the introduction of PAF leads to an increase in strength, products or reduce the amount of cement while maintaining the same strength.

Claims (1)

Invention Formula Raw mix for lightweight concrete, including cement, expanded polystyrene granules, neutralized air-entraining resin and rock, characterized in that, in order to increase the strength of concrete and mobility of the concrete mix, it contains the addition of sodium salt of polyethylenepolyamino polymethylphosphonic acid in the following ratio components, wt.%: Cement71,39-71,42 Styrofoam4.23 Neutralized air entraining resin0.08 Sodium solo polyethylene-polyamine polymethylphosphonic acid 0.01-0.05 WaterEverything