ES2891176B2 - PROCEDURE FOR OBTAINING A SOIL STABILIZER PRODUCT AND PRODUCT OBTAINED - Google Patents

Description

DESCRIPTION

Procedure for obtaining a soil stabilizer product and product obtained

TECHNICAL SECTOR

The present invention refers to a procedure for obtaining a soil stabilizer product, applicable in the stabilization of trails, rural, agricultural and forestry roads, as well as soils of thermo-solar and wind power plants, parks, gardens, campsites, fairgrounds , pedestrian lanes, bicycle lanes, equine centers, and in general any type of esplanade or dirt track.

The object of the invention is to provide the market, and in particular the floor construction sector, with a product designed to stabilize "in situ", the floor itself with a binder and, possibly, water to reduce its plasticity and susceptibility to water or increase its resistance, and that suitably compacted is used in the formation of esplanades.

BACKGROUND OF THE INVENTION

The execution of a stabilized soil "in situ" includes the following operations:

• Study of the mixture and obtaining the working formula.

• Preparation of the existing surface.

• Breaking up the soil and proceeding to its stabilization with the incorporation of polymer, balancing the degree of humidity.

• Distribution of the conglomerate.

• Execution of the mix.

• Compaction.

• Surface finish.

• Curing and surface protection.

• There are infinity of parameters, to confer additional properties, according to demanded requests.

The performance of a traffic road can be improved with ecological stabilizers, which include a wide variety of compounds that act on the physical and mechanical characteristics of the soil. Nanotechnology makes it possible to combine the properties of conventional formulations with the ability to interaction at the molecular level, achieving economic and environmental benefits.

Laboratory and field results of a range of organic-inorganic stabilizers are presented, with inert action already in the applied phase, modifying the physical-chemical characteristics of the soil (capillarity, retraction and permeability), reducing water erosion and the percentage of swelling in expansive soils and increasing the resistance to simple compression and generating a matrix whose hardness and final resistance will depend on the hydrogeological characteristics of the native soil and the circulation of vehicles.

There are different reasons to raise the need to stabilize natural roads instead of carrying out their paving. In many cases, the economic criterion of minimizing costs prevails with respect to conventional alternatives, so as to allow the flow of vehicles in conditions that, although not ideal, at least minimize the impact of problems such as the formation of tracks and the raising of dust. In other cases, an aesthetic concept of design of a project may appear, in which the rustic character of the streets is preserved, but without giving up the benefits of traditional pavement.

EXPLANATION OF THE INVENTION

The soil stabilizer product obtained based on the procedure that is recommended is intended to carry out the stable balance of the soil, based on the mixing of different compounds with the substrate to improve the performance of a transit route, with an interaction between the binders and the different materials that make up the soil, so that the effects of the interactions include:

• Adhesion, where the binder acts as a binder for the soil particles.

• Absorption, where the binder traps the relative humidity of the environment, thus reducing the emission of dust.

• Dilation, which is the effect of water dispersion when the substrate is subjected to vibratory compaction.

• Dispersion, where the binder separates the fine particles from each other.

• Ionic effects, where the action of the binder reverses the electrostatic charge in some types of flooring.

• Surfactation, where the binder reduces surface tension.

Obviously, each type of stabilizer can have an effect on one or more of the performance properties of the soil, depending on the specific type, the application conditions and the type of soil treated.

In any case, the stabilization technique based on the product obtained through the process of the invention requires an intimate mixture between the local soil, the required aggregates and the corresponding stabilizers, attending to issues such as the quality and granulometric distribution of the aggregates.

The stabilizer product, based on nano-technology, represents an incremental innovation in the development of chemical stabilizers, by combining the properties of conventional formulations with the capacity for interaction at the molecular level that the incorporated nano-particles have, so that This greater interaction derives from the increase in the specific surface of the reagent, resulting in an economic benefit by requiring a smaller amount of additive per unit of volume to stabilize and an environmental benefit by minimizing the eventual impact of aggregates not present in the original soil.

Specifically, the procedure consists of making a mixture of industrial slag based on alunino silicates, silica sand and the incorporation of an alkaline activator, so that the components that make up the industrial slag compound appear with the following percentages by weight:

Industrial slag:

SiO2 ... ....... 35.50%

Al2O3 ... ....... 11.70%

CaO. ......41.86%

MgO ..... ...... 7.90%

F2O3..........0.27%

Total yes. . . 0.83%

Na2O ... . . 0.32%

K2O ... . . 0.38%

MnO. . . 0.33%

TiO2 ... . . 0.55%

Siliceous sand (Percentages by weight)

SiO2 ....... ... 99.40%

AI2O3 ...... . ... 0.25%

TiO2 ....... . 0.02%

Fe2O3 ...... . 0.02%

CaO ....... . 0.03%

MgO ....... ... 0.01%

MnO..........0.01%

Na2O ........ ... 0.01%

K2O ....... ... 0.01%

ZrO2 ... ....... 0.01%

P. fire ... ... 0.18%

Alkaline activator (Percentages by weight)

Na2O . . . ... 17.50%

SiO2 . ......27.50%

aqueous solution. Weight ratio: SiO2/Na2O ............1.6

Regarding the participation of these compounds in the final formulation, their composition in % by weight would be the following:

• Industrial slag based on alunino silicates....between 72.5 and 73.5%

• Siliceous sand.............................................. ...... between 15.1 and 15.4%

• Alkaline activator............................................ between the 5.3 and 5.5%.

• Water................................................ .................. between 5.5 and 7.5%.

From these compositions and mixtures, a biocomposite conglomerate is obtained for the stabilization of soils prone to physical and chemical anomalies, which it provides with an ideal bearing capacity, improving its initial properties and adapting it to the most demanding applications of use, resulting in a solution profitable and sustainable for the recomposition of all types of floors.

Among the most notable properties of the product obtained, the following should be mentioned:

• Adjustable setting, due to the reaction of its own components, providing excellent short-term resistance.

• Volumetric constancy, under variable hygrometric conditions.

• Less expansion, weak retraction and greater flexibility, under certain mechanical conditions, which favors adaptation to soil deformations, without causing cracks.

• Better sealing against physical attacks (vibrations, wind, freeze-thaw cycle) and chemicals (rain, acid salts, etc).

• Greater structural tightness, due to the self-sealing of cracks: the mortar absorbs water, dissolving one of the components that make up the formulation, which penetrates into the holes and micro-cracks, where it consolidates and is sealed by default.

• Ability to maintain original appearance and firmness, providing greater durability.

• Non-polluting, non-invasive or intrusive system.

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• Ability to design products with mechanical behavior in compression and bending superior to those obtained with conventional cement.

The product obtained can be used as a binder, dispersant, emulsifier and sequestrant for a host of components that make up the substrate.

Its use and field of application is immense, from roads to parks and gardens, agricultural paths, car parks, nurseries, orchards, airfields, passing through all kinds of skid trails, mines, military roads, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

To complement the description that is going to be made below and in order to help a better understanding of the characteristics of the invention, according to a preferred example of its practical embodiment, a plan is attached as an integral part of said description, where By way of illustration and not limitation, the following has been represented:

Figure 1.- Shows a table and its corresponding graph, relating to a study of the mechanical resistance of a series of specimens made based on the procedure object of the present invention.

EXAMPLE OF PRACTICAL EMBODIMENT OF THE INVENTION

Experimentally and merely as a guide, to obtain the product object of the invention, the following mixture of industrial slag based on alunino silicates, siliceous sand, to which an alkaline activator diluted in water was incorporated, according to the following composition:

Thus obtaining a bio-composite conglomerate for soil stabilization with optimum performance, such as those described in the previous section, and whose mechanical resistance was verified by using a series of test tubes subjected to compression for different numbers of days, results that are visible in figure 1.

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Claims (5)

1a.- Procedure for obtaining a soil stabilizer product, characterized in that it consists of carrying out a mixture of industrial slag based on alunino silicates, siliceous sand to which an alkaline activator diluted in water is incorporated, where said components participate in the following ratio. • Industrial slag based on alunino silicates....between 15.1 and 15.4% • Siliceous sand.............................................. .......between 72.5 and 73.5% • Alkaline activator..............................................between 5.3 and 5.5%. • Water................................................ ...................between 5.5 and 7.5%. 2a.- Soil stabilizer product, characterized in that it has the following composition: • Industrial slag based on alunino silicates....between 15.1 and 15.4% • Siliceous sand between 72.5 and 73.5% • Alkaline activator between 5.3 and 5.5%. • Water................... between 5.5 and 7.5%. 3a.- Soil stabilizer product, according to claim 2a, characterized in that the industrial slag has the following composition in % by weight: SiO2 ............ 35.50% Al2O3 ............11.70% CaO .............41.86% MgO...........7.90% F2O3...........0.27% Total S.............0.83% Na2O ............0.32% K2O ............0.38% MnO ............0.33% 1 TiO2 ............0.55% 4a.- Soil stabilizer product, according to claim 2a, characterized in that the siliceous sand has the following composition in % by weight: SiO2 ....... ... 99.40% Al2O3 ....... . 0.25% TiO2 ....... . 0.02% Fe2O3 ....... . 0.02% CaO ....... . 0.03% MgO ....... ... 0.01% MnO..........0.01% Na2O ....... ... 0.01% K2O ....... ... 0.01% ZrO2 ..... . ... 0.01% P. fire ... ... 0.18% 5a.- Soil stabilizer product, according to claim 2a, characterized in that the alkaline activator has the following composition in % by weight: 1 Na2O ............17.50% SiO2 ............27.50%