SU658154A1 - Bitumen-mineral mix - Google Patents

Description

The invention relates to the field of construction, specifically to a mixture of bitumen and minerals, which can be used to construct thin protective layers of road and airfield pavements, urban areas and car parks. A known bituminous mineral mixture is inclusive of a bituminous emulsion, a mineral filler, a stabilizer and water. Surfactants such as amines and polyamines 1 are used as stabilizers. Bitumen mineral for a mixture comprising a cationic bitumen emulsion, a mineral filler, a stabilizer and water 2 is the closest to the proposed invention. A disadvantage of known bituminous mineral mixtures is the rapid disintegration due to contact bituminous mixtures with powder-like mineral additives. The purpose of the present invention is to increase the stability of the mixture. This is achieved by the fact that a bitumen-mineral mixture, including a cationic bitumen emulsion, a mineral filler, a stabilizer and water, holds, as a stabilizer, a condensation product of carboxyl amine with polyethylene ethers of alkylphenols with an oxyethyl chain length of 7-20 in the following ratio by weight CHO Cationic bitumen emulsion The condensation product of carboxyl amine with polyethylene ethers of alkyl phenols with a length of 0.2-1.1 hydroxyethyl chain 7-20 5-30 The stabilizer is introduced into the bitumen designed for and cationic emulsion, where it simultaneously performs the role of an emulsifier. The substance used to stabilize the mixture (the condensation product of carboxyl amine by polyethylene glycol alkylphenol ethers) is an aliphatic long chain tertiary amine which, due to the presence of the polyoxyethylene chain, is highly hydrophilic. The aggregative stability of bitumen emulsions is determined by the electrical molecular solvation factors that determine the strength of the structural-mechanical barrier. The role of the molecular solvation factor is especially effective when there are enough hydrophilic functional groups on the surface of bitumen droplets. The high hydrophilicity of the emulsifier leads to the attraction of the adsorption layers of water molecules into the micellar structure, which contributes to the strengthening of the system and slowing down the processes of decomposition and emulsion when interacting with mineral matter. Based on these prerequisites, to increase the hydrophilicity of carboxylamino E molecules and enhance their stabilizing ability, carboxyl amines are modified by condensation under normal pressure and 180-t 240 with a mixture of polyethylene glycol ethers of mono- and dialkylphenols with hydroxyethyl chain from 7 to 20 ro reaction : KCOOC2H4 M-C HdON + carboxylamine starting material {OP-7 - OP-20 0 (CH2CH201 H - RCOOC, (CHjCHjO) „-0 R t Hd 2 modified carboxylamine g R - alkyl residue containing more than C atoms; R - alkyl residue containing 8-10 atoms of C; or H; n 7-20. Modified carboxylamines have a high stabilizing capacity, since they contain, in addition to hydrophilic amino-hydroxy ester groups, also the oxygens of the ether groups of the polyoxyethylene chain, which are prone to hydrates. This stabilizer mixture is introduced into bitumen, designed to produce an emulsion at a rate of 0.2-1.1% by weight of the mineral material, and performs the functions of a bitumen emulsifier and a mixture stabilizer. By varying the stabilizer content in bitumen, it is possible to increase or decrease the decomposition time depending on the circumstances of work on the mobile unit, which affect the rate of disintegration of the emulsion: the change in the outside temperature, the content of fine fractions in the mineral material, etc. Three compositions were prepared to prepare the bituminous mineral mixture: one based on the known slurry composition described above, the other two in accordance with the present invention. Moreover, the amount of mineral material, cationic bitumen emulsion and the properties of these ingredients in all three compositions were the same. Men ls only stabilizer. The resulting mixtures had the following physical and mechanical characteristics (see Table 1).

Mineral material - 100

Emulsified - 30 Water for wetting (1% solution HD-180 - 15.0) Portland cement - 4, f Mineral mineral-mineral compound - 100 Emulsion - 30 and the mixture (stabilizer content - 0.4% of

a mixture of 1 weight of mineral material) Water for moistening - 20 Same as mixture 1, but the stabilizer content is 0.6% of

a mixture of 2 weights of mineral material. ,

sixteen

9.2

12.10

5.8

0.07

55

2.8

0.00

Claims (2)

190 As can be seen from the table, the phyico-mechanical parameters of mixtures prepared in accordance with this invention are better than those of a mixture of known composition. A change in the concentration of the stabilizer of the torus makes it possible to increase the mixing time until the emulsion is completely decomposed several times. Due to this, the homogeneity of the mixture is improved, which makes it possible to reduce water permeability and make them more durable. In addition, there is no need to prepare and use a stabilizer solution, which includes expensive and scarce surfactants, and the fourth component, which is a known mineral additive, is excluded. All this makes it possible to significantly simplify the technology in preparing the mixture and, accordingly, the design of mobile sludge plants. The expected economic effect from the use of the bitumen mineral mix according to the invention will be 1,700 rubles. 1 km of pavement The formula of the invention is a bituminous mineral mixture comprising a cationic bitumen emulsion, a mineral filler, a stabilizer and water that, in order to increase the stability of the mixture, it contains as a stabilizer a condensation product of carboxylamine with polyethylene ethers of alkylphenols with an hydroxyethyl chain length 7 -20 in the following ratio of weight.h .: Mineral filler 100 Cationic bitumen emulsion 10-35 The condensation product of carboxyl amine with polyethylene ether and alkylphenols from lengths hydroxyethyl chain 7-20 0.2-1.1 Water5-30 Sources of information taken into account during the examination 1.G. Roads and Road Construction, England, 1967, 531, 45 66-68. 2.Methodical recommendations on the arrangement of thin protective layers of an emulsion-sand mixture on black road surfaces, Soysdornia,., 1971.