SU1275016A1 - Composition for fresh-laid concrete protection - Google Patents

Abstract

The invention relates to building materials and can be used to protect fresh concrete from being prematurely dried during the hardening process of the concrete. The proposed composition allows to reduce moisture loss from the surface of freshly laid concrete, to increase the density and crack resistance of concrete. The composition for the protection of fresh concrete contains, in wt%: 45-65% divinyl styrene latex 3-25; petrolatum 3.5-20.5; waste production of lanolin based on fatty acids. wool fat 1.8-4.2; soda ash 1.2-3.1%; The byproduct of oil dewaxing is a distillate and a molten gach or a waste of Gaccha deoiling, a paraffin-based slop wax (L 3.8-25.2; a plasticizer 0.5-5.6; e water - the rest. 2 tab.

Description

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Claims (2)

ate 112 The invention relates to building materials and can be used to protect fresh concrete from premodern evaporation of water during solidification and dry heating of concrete products. The purpose of the invention is to reduce moisture loss and increase the density and crack resistance of concrete. The proposed and known compositions of the compositions are given in table. 1. Distillable sachet, a by-product of the dewaxing of the distillate raffinate, of selective purification is a mixture of mineral milk and paraffin with mp. 36-49 ° C. Content of oil in gahe 2 .- 30 May,%. Slop-vox - waste of de-greasing of gacha contains mineral oil. (1.9 45 wt.%) And soft paraffins С ,,, | normal structure (50-60 May and low-melting isostructures (4050 wt.%), its melting point is 30-37 ° C. the condensation product of melayin with formaldehyde — a super plasticizer, or sulfite salt; a European masonry. The composition is prepared as follows: The calculated amount of petrolatum, distillate slack or slop woks and waste of lanolin – fatty acid production of wool fat is melted at 70-90 ° C and homogenous simulate in a paddle mixer for 5 minutes, Infuse the resulting brittle with a hot soda ash solution, previously prepared by dissolving soda in 50% of the calculated amount of water, and stir the mixture for 4–5 minutes. The remaining amount of hot water is added to it and, without stopping mixing, the dispersion is treated for 10 in a hydrodynamic-wave installation or in a paddle stirrer at rpm. The hot dispersion is poured into a storage tank and, after cooling, the ready 25-45% aqueous dispersion of petrolatum with gachi or slop wax is mixed with the calculated amount of plasticizer and divinylstyrene latex. 16 The composition is applied to the exposed surfaces of the concrete of freshly molded products using a spray method, for example, pneumatic, airless, etc., at an air temperature of 5 to 50 ° C without prior heating. The time it takes to form a film on super-molded concrete is 0.5 - 3 hours, depending on the temperature and relative humidity of the surroundings: 1 environment. In order to reduce the slip of the coating (in road or airfield construction), an additional 0.5 to 20% by weight of a finely dispersed filler, for example, aerosil5, barite melad, flame retardant, can be added to the composition. These fillers are simultaneously1.11 psvp ay.-: the light-reflecting ability of POINTING, Physical-technical indices. Of concrete samples, enclosed by the proposed composition, are given in table. 2. Low melting components of the composition, as well as all plasticizer sulphonates, saturate and smooth the pores of concrete to a depth of 4–8 mm, effectively provide it completely from dehydration and increase the density and crack resistance of the concrete during drying and at. hardening of products under the conditions of a dry hot climate, Oils and m; 1. Paraffins hydrophobicize the surface layer of concrete, and sodium sulfonates interact with calcium hydroxide of cement, form calcium sulfonates, additionally clogging concrete 11C. Claims of the invention. The composition is for the protection of freshly laid concrete, including: SI, and A5 - 65% divinylstyrene latex, petrolatum, production waste of laguline based on fatty acids of wool fat, cal 11, ionic soda and water, about 20% Yu iji, and with that. that, in order to reduce moisture loss and jumping; to the density and crack resistance of concrete, it additionally contains a by-product of oil dewaxing — distilled slack or a waxy de-oiling deacidification — paraffin-based SLOPE-WOX and plasticizer in the following ratio of components, - wt.%: 45 - divinylstyrene latex 3-25 Petrolatum . 3.5-20.5 Waste production of lanolin based on wool fatty acids Distilled gnash or gacha deoxication waste - slop-wax on Divinilstyrene latex 45% .- 50 3 65% -un5- A by-product of oil dewaxing - distillate acne - - Waste from deactivation of paraffin-based - 13 Petrolatum28.5 7.5 14, Lanolin production based on fatty acids of organic fat 3.8 1 3, Soda Ash 1.9 0.5 2, Plasticizer Sulfonate R-SOjNa - 3, Alkylsulfonate Sulfonated Melamine Condensation Product with Formaldehyde Monoalkylphenyl Polyethyleneglycol Ether, Water60.8 41 60, 5 - 325 3 , 812.8 3, 5 20,53,5 3 4,21,8 2 3,11,2 1,9 9, 4 59,855,2 The conditional viscosity of the composition at, C, s Moisture loss from concrete,% of the mass of mixing water Opened integral and the porosity of concrete, W,% Depth of impregnation of concrete, (, mm State of the protected surface Microcracks Strength at stretching, at splitting, Rp. , MPa Consumption composition, kg / m Table2 U5 10.8 14.4 12.3 32 10 6 12 27 3.4 3.9 3.5 3.1 four 7 3.5 3.3 4.0 4.2 4.1 4.1 0.4 0.35 0.28 0.30 0.32 0.33 Separate - Smooth without Smooth without micro cracks of cracks of crack