CS241557B1 - Filling-in paste for cement-concrete road surfaces joints sealing - Google Patents

Description

The present invention relates to a glue compound for sealing cementitious concrete pavement joints. It solves the weight and material composition of grout for the stated purpose and usable) also for sealing cement-concrete covers of airports, parking lots, as well as various parts of building constructions.

With the development of transport, the requirements for speed and quality of modern technology implementation also increased in the area of transport constructions. In building cement-concrete road and airport covers, it is especially a technology for cutting contraction joints. The cut joints are relatively narrow with a smooth wall surface. The width of the joint is only 3 to 6 mm, which results in a large percent deformation of the joint due to thermal expansion. The built-in grout is also exposed to these conditions and must withstand up to 100% expansion at temperatures of -15 to -20 ° C.

The grout produced by us does not meet these demanding requirements, mainly due to their low functionality and durability. These grouts are predominantly on. bases of additive and diapered primary resp. semi-blown asphalt. The materials are thermally unstable, have poor adhesion to the substrate and low ductility in the low temperature region. They are eg. various kinds of filler asphites, or asphalt modified materials mainly modified with polyehylene. Modified resp. additive asphalts achieve only some requirements that are placed on top-quality grout, a satisfying thorn and grip point, but on the other hand they lack! low-temperature ductility and flexibility, thus satisfying qualitative parameters at low temperatures (up to - 20 ° C), when the grout mass is most stressed on the joint.

In developed countries, various types of materials are used for this purpose, besides mine, asphalt-based material modified with synthetic elastomers. For this purpose, mainly special types of synthetic rubbers of the SBS type are used. These are distinguished! has higher dispersibility and workability in asphalt bitumen than conventional types of SBR. They can be added to bitumen directly and at a lower temperature (approx. 150 ° C). The compositions thus prepared are practically untreated, in exceptional cases by an inorganic filter.

In our conditions, the modification of bitumen by synthetic elastomers is solved using conventional types of synthetic rubbers of the SBR type. These are in particular compositions prepared by a solvent method e.g. according to AO 178 249, AO 180 831 etc. By modifying the asphalts with synthetic butadiene-styrene rubber we will only achieve a partial increase in the quality parameters, especially in the case of asphalts of primary and semi-blown lower gradations. The compositions achieve a soft roll only of 60 ° C, a high penetration of up to 220 pen. units and low resistance to penetration of foreign bodies into the mass.

However, they achieve favorable properties in the field of low-temperature ductility and resistance.

The above parameters can be adjusted or changed. by adding a certain amount of vulcanized rubber or other organic or mineral fillers. The addition of the rubber is in this case solved in various forms (granulate, chips, pulp, etc.), but only in the secondary phase, ie after the addition of synthetic rubber. A special feature of these compositions, however, is that only 10 to 15% rubber (by weight of asphalt, compositions) can be used here, because the viscosity of these compositions! it reaches too high a value and such a mixture is only very difficult to process. Thus, it is apparent from the above that only as much rubber may be added to the asphalt-elastomer composition that does not cause poor processability of the mass but, on the other hand, this will only result in a slight increase in quality parameters.

A further drawback that appears here is the lack of homogeneity of the composition, which is caused by the coating of the rubber agglomerates with an elastomer, which can no longer be disrupted in the next homogenization process. The compositions thus prepared have a dipping point of only about 65 ° C, a pentation of up to 200 pen. units, high mass flow and insufficient resistance at higher operating temperatures.

These drawbacks are completely eliminated by the "grout for sealing cementitious concrete pavement joints", based on modified primary and semi-blown asphalts with synthetic rubber according to the invention, characterized in that it contains from 1 to 20% by weight of graded waste vulcanized rubber of continuous fraction up to 2 mm. 0.1 to 5% fly ash fraction up to 0.5 mm. and 0.01 to 5% rosin fraction up to 0.2 mm.

The essence of the invention is that bituminous bitumens of lower gradations (primary and lower gradations of semi-blown) are treated with elastomers of synthetic rubbers, with the addition of a sorted waste vulcanized rubber of 0-2 mm fraction and other active ingredients such as rosin and fly ash to form a composition. joints of cement concrete pavements, which can not be achieved only by filling resp. modifying asphalt bitumen with comparable results in qualitative parameters. Furthermore, the vulcanized rubber and other additives and are fed into the molten asphalt in the primary phase, i.e. first and blended perfectly with it. The synthetic rubber solution is added to the mixture only after this operation, and it is important that it contains a large excess of a suitable organic solvent which attacks and respirates. etched the vulcanized rubber present, which then fits better to the elastomer macromolecules to form a more rigid elastomeric structure in the composition. This influence is increased by the suitable temperature of the process, the duration of the process, the performance and efficiency of the mixing device and of course the quality and fraction of the vulcanized rubber. Other ingredients - fly ash and rosin are involved in increasing the point of browning, reducing penetration and flow of matter and rosin, as well as enhancing the tackiness of the composition.

The advantage of this solution is that the resulting composition is perfectly homogeneous (without clumps of rubber) and exhibits higher quality parameters than the masses prepared by other processes. The described grout achieves very good physical-mechanical properties and functional parameters even in the low temperature range (up to - 20 ° C). Its main advantages are: high range of plasticity, excellent adhesion to the walls of the joint, high low-temperature ductility respectively. ductility, resistance to penetration of mineral particles and good shape memory. Achieves these parameters: · KG softening point 75-105 ° C, breaking point -18-226 ° C, ductility 40-80 cm, penetration 60-100 penetration units, elongation at -10 ° C 120-200% and plasticity range Mp 80-110 ° C.

Examples

1. Honor Asphalt A 80—82% + Synthetic Rubber SBR - 8%

Mass parameters:

Steeping point KG 56 ° C, penetration at 25 ° C 150 penetration units, ductility at 25 ° C 100 cm, brittleness according to Frassa -24 ° C, flowability at 60 ° C (BS) 150 mm, test tack, foil PE strength shear strength 0.245 MPa peel strength 68.32 N / cm

2. Asphalt A 80—82% + rubber - 8% + + granulated rubber - 10%

Mass parameters:

baking point KG 68 ° C, penetration 50 penetration units, ductility 29 cm, brittleness -17 ° C, flowability at 60 ° C (BS) 94 mm, tack (PE foil) shear strength 0,225 MPa peel strength 59,92 N / cm

3. Asphalt A 80-82 ° / o 4-sorted rubber (fr. Up to 1.5 mm) - 10%, rubber SBR - —8%

Mass parameters: KG point of penetration 74 ° C, penetration of 96 penetration units, ductility 75 cm, brittleness -22 ° C, flowability at 60 ° C (BS) 62 mm, tack (foil PE) shear strength 0,247 MPa peel strength 69 .27 N / cm

4. Asphalt A 80-82% + sorted rubber (fr. Up to 1,5 mm) - 8 ° / o, fly ash (fr. Up to 0,5 mm) - 2%, rubber SBR - 8%

Mass parameters:

baking point KG 77 ° C, penetration 80 penetration units, ductility 62 cm, brittleness -22 ° C, flowability at 60 ° C (BS) 43 mm, tack (PE foil) shear strength 0,238 MPa peel strength 68,76 N / cm

5. Asphalt A 80-82% + graded rubber (fr. Up to 1.5 mm) - 8 θ / ο, fly ash (fr. Up to 0.5 mm) - 1.5 θ / ο, rosin (fr. Up to 0 , 2 mm) - 0.5%

All pulverulent material components and graded vulcanized rubber are metered into molten asphalt at a temperature of 100 to 120 ° C while stirring. After thorough mixing, synthetic rubber is added to the mixture as a solution in an organic solvent with a 10.5-20 fold excess of solvent. The mixture is further homogenized until the solvent has evaporated and the max. temperature 18 ° C, whereby the solvent is evaporated and collected in the condenser.

Mass parameters:

KG softening point 78 to 82 ° C, penetration to 80 pentation units, ductility to 60 cm, brittleness -22 to -24 ° G, flowability at 60 ° C (BS) 38 mm, tack (PE foil) shear strength 0.285 MPa peel strength 76.28 N / cm

The production can be carried out in modified homogenization equipment for the preparation of poured asphalt mixtures. The equipment must have the following features: good controllable heating up to 200 ° C, if possible indirect (duplicator), solvent trapping cooler, powerful mixing equipment, metering solution for rubber solution and powdered fillers and suitable apparatus for troll temperature. The materials prepared in this way can be used for insulation and grout purposes,

I bonding of plastic foils as well as binders for high-filled asphalt mixtures.

Claims (1)

SUBJECT Grout for sealing joints of cementitious pavements based on primary and semi-blown asphalt modified with synthetic rubber, characterized in that it contains from 1 to 20% by weight of sorted graded vulcanized rubber of the continuous fraction up to 2 mm, 0.1 to 5 ° / o fly ash fraction up to 0 , 5 mm and 0.01 to 5% rosin fraction up to 0.2 mm.