SU1530625A1 - Composition for proecting freshly-laid concrete - Google Patents

Abstract

The invention is intended to protect freshly laid road concrete, as well as for airfield pavements, from premature evaporation of moisture during natural hardening. The purpose of the invention is to increase the roughness and light reflectance of the coating while maintaining its water-holding capacity. Composition for the protection of fresh concrete contains, in wt.%: 30 - 65% styrene latex 6.9 - 22.8

petrolatum 0.4 - 18.5

waste of lanolin production based on saponified acid wool fat 1.3 - 2.5

soda ash 1 - 1.7

soft paraffins with a hardening temperature of 14 - 32 ° C 10.3 - 30.4

sodium silicate or polysilicate 9 to 31 aqueous solution

water - the rest. The protective coating has a movement safety factor of K = 0.82 - 0.88. 2 tab.

Description

The invention relates to the building materials industry and can be used to protect fresh concrete, including road and airfield pavements, from premature evaporation of moisture during natural hardening and dry heating of products.

The purpose of the invention is to increase the roughness and light reflectance of the coating while maintaining its moisture-holding capacity.

The compositions and properties of the composition are given in table. 1 and 2.

Waste from the production of lanolin is wool fatty acids or a mixture of them with off-grade lanolin with a blind indicator:

Acid number,

mg KOH / G15-120

The number of saponis,

mg KOH / G28-150

The content of unwashed substances, 2; 20-59

Droplet temperature, C 40-75

Acid wool fat, included in the waste, mainly contain, wt.%:

Anteiso-acid Co-C)

with an odd number of carbon atoms (12 acids in all) of n-Acid C ,. with an even number and

thirty

cl

00

about to eat

3

with an odd number of carbon atones (15 acids)

FROM ACID Cip-Cja

an even number of carbonaceous osmosis (12 acids) (Y-hydrox-n-acid .- with an even C 2 number with an odd number of carbon atoms (13 acids 1-hydroxy-iso-acid L (with an even number of carbon atoms (6 acids ; s.-gidroke 1-anteiso-sour

you

 ,-WITH

15

With odd

the number of carbon atoms (7 k. slots)

Pecond | -1tsiony lanolin, which enters a waste, consists mainly of, - С-l, -slerrin, n-alcohol from iso-alcohol, and ante-11O-a. 1Cpoles Ci- -CZZ

As styrene latex, the composite contains divinyl styrene latex (35th BS-30 or BS-5t), or 45% BS 85, or ChS-BBGP, or SCS-50KGP, or B5% SKS-S, or piperylene-styrene: atex CCPS-50, or 30% -, the first LPS-50. As soft paraffins, compost 1 contains petroleum particles with a pour point.

l i - 32 C i- no more

oil content

The composition is prepared as follows.

 Estimated amount of petrolatum, mg of paraffins and lanolin waste ;; - fatty acids of wool fat are melted at 70-80 ° C and homo: ejected in a paddle stirrer or with bubbling with soft air for 3-5 minutes, then, as the mixture is melted, a hot soda ash solution is introduced into this melt The dispersion is passed through an emulsifier, hydrodynamic-wave set-up R1.1 min. Cooling-1-t dispersion and mix it with latex, 3 then with sodium liquid glass fiber 1 with a density of 1 ,, 52 t / m or with a polyschlate with a density of 1.20 t /, L1 silica module

SiOi

(M7yu disp, with thoroughly re-i.ieiiinHiTKjT

(M - 1 .0323

Prigo

20

25

- to -

30625-

The composition is applied to the surface of freshly molded concrete by pneumatic or mechanical means at a flow rate of 0.25-0.45 kg of the composition per 1 m of the concrete surface. For 1-3 hours, the applied composition forms a vapor-proof rough coating on the concrete with a high coefficient

d diffuse reflection of solar radiation.

The most important technical feature of the proposed composition, determining its quality and effectiveness of protection

g concrete from dewatering, is aggregative stability, i.e. resistance of the composition to delamination during long-term storage at both normal and elevated (for example, in summer or in areas with hot climates) temperatures.

The increased light reflection of the coating prevents freshly laid concrete from thermal overheating by solar radiation, from the appearance of microcracks in it, from a decrease in the physicomechanical characteristics and durability of the road cement-concrete web. The average roughness depth of a concrete with a developed composition is 2-3 mm. Enhancement of light reflecting ability and roughness of the coating is provided by the decomposition of silicate and sodium polysilicates with concrete compounds (calcium ions, magnesium, etc.), the release of white amorphous silicic acid with abrasive properties. Sodium oxides, which are released during the decomposition of silicate and sodium polysilicates, also contribute to the roughness of the coating. Interacting with fatty acids, sodium oxides form an additional amount of sodium soaps, which, due to the hydrophobization of the surface of the pores, make it easier for the solid nonpolar hydrocarbons (petrolatum, paraffins) responsible for the coating to be absorbed by them. Due to this, the amount of solid hydrocarbons on the concrete surface decreases noticeably, and its roughness increases accordingly.

The roughness of the coating affects the adhesion of the wheel of an automobile, an aircraft with a concrete coating, which naturally affects 6e3 or more.

40

45

55

but movement. The proposed protective coating has a high coefficient of traffic safety (K 0.82–0.88), while the known one is unacceptable for protecting concrete of roads and airfields due to the low value of this coefficient (K 0.62) and has an almost marginal value of safety factor movements (, 73).

With the diffuse light reflectance of the developed coating Ka 2-53%, the concrete in the sun heats up less than the concrete with a composition of known composition (Ka 23-31), and the difference in thickness of the concrete

15

(about 0.2 m) with the developed coating reaches only 8-9 This composition of known composition 13 1b C. Because of the significant temperature difference (10 C) in thickness of concrete, its crack resistance during operation decreases and, accordingly, durability decreases.

Claims (1)

Invention Formula Composition for the protection of fresh concrete, including 30-b5% styrene latex petrolatum, waste 8), o to). 1530625 0 production of lanolin based on saponified acid wool wool, soda ash and water, characterized in that, in order to increase the roughness and light reflectance of the coating while maintaining its water-holding capacity, it contains additional soft paraffins with a hardening temperature of H-32 C and an aqueous solution silicate or sodium polysilicate with a silica module of 2.6-, 5 and a density of 1.26-1.52 t / m at the following. the ratio of components, wt.%: 30-b5% styrene latex6,9-22,8 Petrolatum0, 5 Waste production 0 lanolin based saponified acids wool fat 1.3-2.5 Calcium soda1.0-1.7 5 Said soft paraffins10,3-30,4 Specified water silicate solution or polysilicate 0, sodium 9-31 WaterEverything Styrene latex: 301-th LPS-50 t Sl-Hbi SKS-65 GP b5% SKS-S Petrolatum Waste from the production of lanolin on the ax of fatty acids of wool fat Kagtsiirovanna soda Soft paraffins with a freezing point, with: 18-28 20-32 Sodium liquid glass with density 1.52 t / m and module 1.36 t / m and a module Polysilicate sodium with a density of 1.26 t / m and molol, 5 Water Polysilicate sodium Redcon firm (USA). Table 1 22.8 - -6.9 -6.9 50 - 17.2 - -6, 9-22.8 7.5 7.8 O, if 18,518,510,318,5 1 0.5 1.3 2.2 2.52.5 22.3 11.5 1.7t, 7 I, 1.6 10.3 30.14 16.3- 18.1 16.3 - 142 31 35 20-9- 41, 0 25.8 28.3, 1 i5.1 38, i 21.5 Aggregative storage stability of the composition (n., - does not exfoliate, p. - exfoliate). Diffuse reflectance coefficient of the coating, K, I Protected surface condition Traffic safety factor Moisture loss of concrete LI,% by weight of water zatoooeni Integral porosity of concrete W is open,% Tensile strength for splitting when splitting Rpp, MPa N. p. N. p. N. p. i.r. nr nr nr R. 23-29 214-31 il- i "6-52 36-39" 3-51 Oil - Oil - Shero-Shero-Shero-Maslo - Sheronist, nista hovakhovkhovkhovkova slippery ta ta ta ka not slippery 0.62 0.73 0.88 0.82 0.83 0.85 0.72 0.86 22 23 22 21 19 16 20 31 5 4.8 (4,. 14.3 - ".8 14 i4.8 5.2 3 2, { 3.1 3, 4 3.5 3.2 2.6 The coefficient of traffic safety, depending on the coupling qualities of the automobile wheel and the road surface, is determined using the MP-2 and calculated by the formula K t Ctjl: , where ЕЬИ and Е стк, are the energy losses at, respectively, the wet and dry state of the surface. At K / 0.7, movement over the coating is dangerous. The safety factor for concrete not protected by the coating is 0.83. Editor N. Gunko Compiled by I. Bru Co Techred M. Khodanych Order 7861/26 Circulation 591 VNIMPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 113P35, Moscow, F-35, 4/5 Raushsk Nab. table 2 3.1 3, 4 3.5 3.2 2.6 , where ЕЬИ and Е стск, are the energy losses at, co-corrector T. Malets Subscription