EP3366843B1 - Stabilisation des sols modifiée par polymères - Google Patents

Stabilisation des sols modifiée par polymères Download PDF

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Publication number
EP3366843B1
EP3366843B1 EP18158963.1A EP18158963A EP3366843B1 EP 3366843 B1 EP3366843 B1 EP 3366843B1 EP 18158963 A EP18158963 A EP 18158963A EP 3366843 B1 EP3366843 B1 EP 3366843B1
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ground
binder
subsurface
network former
amount
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EP3366843A1 (fr
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Lehner Markus Walter
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Lehner Markus Walter
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/04—Foundations produced by soil stabilisation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil

Definitions

  • the invention relates to a method for solidifying a substrate and a substrate consolidator.
  • ballast base layer In the manufacture of roads, a layer of soil is usually removed first, and after the surface is leveled, a gravel base layer is applied, followed by an asphalt base layer, an asphalt binder layer and an asphalt surface layer.
  • the ballast base layer often has a thickness of 50 to 70 cm.
  • the soil is usually also excavated because a layer of gravel is applied before the foundation is made.
  • DE 10 2008 016 325 A1 discloses a ground or foundation stabilizer comprising a latex polymer.
  • the soil or foundation stabilizer can be worked with water and cement.
  • a proportion of the hardener based on the cement can be 0.1 to 20% by weight, particularly preferably 0.3 to 10% by weight .
  • DE 10 2004 009 509 A1 discloses a process for solidifying sand-containing soil materials by incorporating a water-insoluble film-forming polymer in an amount of 0.1-10% by weight, based on the solid components of the sand-containing soil material, in the sand-containing soil materials.
  • the process is carried out by incorporating a cement in an amount of 0.5-10% by weight, based on the solid components of the sand-containing soil material, in the sand-containing soil materials.
  • the soil contains water during or after incorporation in an amount of 0.1-30% by weight, based on the solid components of the soil.
  • a method for solidifying a subsurface for example a road and / or a foundation base layer
  • a polymer-based elastic network former (a subsurface hardener) is processed with a binder and water to form a solidified subsurface.
  • An amount of network former used, an amount of binder used and an amount of water used are made dependent on the nature of the substrate.
  • a subsurface hardener for hardening an subsurface (which can be used in the above method), the subsurface hardener comprising a binder and 2% by weight to 3.5% by weight of an elastic (in particular rubber-like) network former an amount of the binder with which the network former and water can be processed to form the solidified substrate.
  • a subsurface stabilizer with the features described above is used, wherein between 2% by weight and 10% by weight of binder, based on the subsurface to be consolidated, is used.
  • a subsurface stabilizer with the features described above can be used as an additive to increase the frost resistance of a subsurface to be consolidated.
  • a subsurface stabilizer with the features described above can be used as an additive to increase the modulus of elasticity of a subsurface to be consolidated.
  • a subsurface stabilizer with features described herein can be used as an additive to increase the tensile strength of a subsurface to be consolidated.
  • the term "subsurface hardener” can be understood to mean, in particular, a material or a material composition that can be taken alone or already mixed with water and placed on and / or in a subsurface to be hardened, so that there is an interaction between the subsurface hardener and that too consolidating subsoil, a solidified subsoil is formed.
  • a subsurface hardener can be present, for example, in a solid phase, in particular a granulate or a powder.
  • a subsurface hardener can also be in a liquid phase or be a viscous material, and during hardening of the subsurface hardener it can be converted into a solid phase.
  • the subsurface hardener can be present as a suspension (or as an emulsion).
  • polymer-based elastic network former can in particular be understood to mean a material which, as part of a subsurface hardener, has a polymer component which cross-links when it hardens and, in addition to a sufficient stability, has a certain stability to the subsurface hardener on or in the subsurface Gives degree of elasticity.
  • the crosslinking of the polymer of the network former can lead to hardening of the subsurface hardener and to hardening of the subsurface interacting with it.
  • binder can in particular be understood to mean a medium which, as part of the subsurface hardener and / or as part of the subsurface to be hardened, forms a bond between the components of the subsurface hardener with one another and between the subsurface hardener and the one to be hardened Underground is configured.
  • Such hydraulic binders can contain cement and / or lime, for example. Lime already contained in the subsoil can provide the hydraulic binding effect in addition to an externally added cement. Portland cement CEM I 32.5 R, for example, can be used as an externally added cement. For example, 3 to 10% by weight can be Cement as a hydraulic binder and 2 to 3.5% by weight of a polymer-based network former.
  • condition of the subsurface can in particular be understood to mean a property of the subsurface which has an influence on the amount of water to be formed in order to form a reliable, in particular optimal, connection between the subsurface and the subsurface hardener.
  • the condition can relate to temporary soil properties, such as a currently increased moisture due to precipitation or a currently reduced moisture due to a dry period.
  • the condition can also affect permanent soil properties, such as a natural moisture content of the soil. If the water content of the subsoil is taken into account when measuring the amount of water that is processed with the subsurface stabilizer to solidify the subsoil, a soil-specific adjustment or optimization of the relative amounts of the individual components can take place.
  • a quantity of water for processing together with a quantity of a polymer-based elastic network former of a substrate hardener and a quantity of binder are not only selected in relation to one another, but also the nature of the substrate to be consolidated when measuring the quantity of water, the quantity of network former and the like Amount of binder included.
  • the nature of the subsurface can include, in particular, its water content. The more water the substrate can contribute to solidifying it using the substrate hardener, the less water has to be added externally, and vice versa.
  • a dry subbing agent e.g. in the form of a granulate or a powder
  • a subbing agent can provide better processing results than a subbing agent that has already been mixed with water.
  • an elastic network former of the subsurface hardener is provided with a quantity in a corridor between 2% by weight and 3.5 wt% based on a binder in a subsurface hardener in order to harden together with the binder and water to form the hardened subsurface.
  • the modulus of elasticity can advantageously be increased.
  • the network former supplied as a polymer suspension ensures an orderly release of water to the hydraulic binder (in particular cement), which leads to an orderly hydrophobization.
  • the network builder thus forms a network with binder and substrate, so that an increased modulus of elasticity can be achieved.
  • the solidified subsoil therefore shows increased rigidity without losing its elasticity, which effectively suppresses tendencies towards crack formation.
  • the network builder clearly fills small gaps in the subsoil, so that water can no longer penetrate into these gaps, resulting in particularly good frost resistance.
  • the subsurface stabilizer described can be processed with between 2% by weight and 10% by weight of binder, based on the subsurface to be consolidated.
  • binder especially cement
  • the more binder especially cement
  • a higher amount of binder increases the tendency to crack.
  • the polymer-based network agent of the subsurface hardener is able to suppress crack formation in moderate amounts.
  • the network former can be supplied as a dry powder or as a polymer emulsion or suspension.
  • the water can be mixed with the subsurface hardener before the subsurface hardener is introduced into the subsurface to be hardened - in particular immediately before the subsurface hardener is introduced into the subsurface to be hardened.
  • Mixing of the subsurface hardener with the water can take place directly at a construction site and thus after the, for example, powdery subsurface hardener has been transported from a production site to the construction site. This significantly reduces the logistical effort in connection with moving the subsurface hardener to the place of its processing.
  • the water can be mixed with the subsurface hardener after the subsurface hardener has been introduced into the subsurface to be solidified.
  • the subsurface hardener can be introduced into the subsurface at the same time, but separately from the water. It is also possible to pour the subsurface hardener first and then the water.
  • only a water reservoir in the subsurface is used to liquefy the subsurface solidifier (for example, in the form of granules or powder). Then no external water is required to solidify the subsurface using the subsurface hardener.
  • a degree of moisture in the substrate can be determined and, based on the determined degree of moisture, the water can only subsequently be mixed with the substrate hardener.
  • the amount of water to be introduced into the subsurface and the amount of network former used as well as the amount of binder used can be adjusted depending on the degree of moisture in the subsurface.
  • a moisture degree determination of the material of the material can be carried out before or during the solidification solidifying substrate are carried out, and depending on the determined degree of moisture, a lot of water, network formers and binders are determined, which are introduced into the substrate to be consolidated with the substrate consolidator. This makes it possible to determine the correct amount of water, network former and binder to be added not only based on the ingredients of the subsurface hardener, but also on the moisture conditions of the subsurface.
  • the binder can be part or all of the subsurface hardener.
  • the binder can be part of the substrate to be consolidated.
  • the binder can therefore be at least partially a component of the subsurface hardener, which can then be selected flexibly and suitably to the other components.
  • cement, lime sand, etc. that are already in the subsurface as binders.
  • the externally added binder can be partially omitted. This reduces the effort in connection with the subsurface hardening.
  • the use of components contained in the subsurface for consolidation makes it unnecessary to remove and dispose of the subsurface material prior to consolidation.
  • the subsurface hardener can be brought in powder form to the subsurface to be solidified.
  • the weight-intensive water can only be added to the subsurface hardener and / or the subsurface as required, briefly or during processing.
  • a mixture can be formed from the network former, the binder and the substrate to be solidified, an analysis can be carried out on the mixture based on a As a result of the investigation, the amount of the network former, binder and water to be mixed with the mixture can be determined, and the specific amount of network former, binder and water can then be mixed with the mixture. After the substrate has been mixed with the substrate hardener as described, a precise amount of water and binding agent can be determined on the basis of the findings of this material introduction, which should be added to the substrate hardener. This makes it possible to find and process an optimal composition of the subsoiler for soil consolidation.
  • the network former and the binder can be processed separately from one another and without premixing into the substrate to be consolidated.
  • the fact that the two components can be introduced directly into the soil independently of one another makes the processing method particularly easy to carry out ("mixed in place”).
  • the subsurface stabilizer has between 2% by weight and 3.5% by weight of the network former, based on the binder.
  • Experimental results have shown that when the elastic polymer-based network former is dimensioned in this way, the solidified soil is not only extremely frost-resistant, but also synergistically quickly and long-term shows a significant increase in compressive strength with a simultaneous increase in the modulus of elasticity. These advantageous effects are particularly pronounced in the area of the aforementioned corridor.
  • Particularly advantageous properties can be considered in the described range to increase the compressive strength and rigidity.
  • Particularly good results were achieved with approximately 2.5% by weight of the network former.
  • the binder can be selected from a group consisting of cement and lime.
  • cement in particular leads to high compressive strength.
  • a mixture of cement and lime also represents a technically advantageous solution.
  • other hydraulic binders can be used as an alternative or in addition.
  • the subsurface hardener can be in powder form or can be provided as granules. The liquefaction of such a subsurface hardener can then, for example, only take place during processing in the subsurface.
  • the subsurface hardener can further comprise water. This can be added to the subsurface hardener shortly before or during processing.
  • the subsurface hardener can be free of at least one from a group consisting of stabilizers, a thickener, a defoamer, and a salt or hydroxide of an alkali or alkaline earth metal.
  • the components mentioned are therefore unnecessary for the subsurface hardener. This allows an inexpensive, environmentally friendly and quick production of the subsurface hardener, which only has to be composed of a few components.
  • the network former is a latex polymer, in particular styrene butadiene latex. It has been found that a latex polymer has particularly advantageous properties with regard to crosslinking and the provision of elasticity to prevent cracking.
  • the network former can have lignin sulfonate.
  • Ligninsulfonates are the salts of ligninsulfonic acid, a water-soluble, anionic, polyelectrolytic, branched polymer. Lignin sulfonates result from the chemical digestion of lignin, a biopolymer that can be reacted with sulfite acid salts using the sulfite process. During the digestion, chemical bonds in the hydrophobic lignin structure are broken up and the resulting fragments are converted into a water-soluble form by the addition of sulfonate groups. Lignin sulfonate is a pulverulent raw material that can be used conventionally for paper manufacture and, according to exemplary embodiments of the invention, can effectively act as a polymer-based network former of the subbing agent.
  • At most 15% by weight of water, based on the substrate to be stabilized, is used.
  • the exact amount of water to be used can be adjusted depending on the soil properties, especially the moisture already present in the subsoil.
  • the ideally selected amount of water depends, among other things, on the compressibility of the substrate.
  • Latex polymers which are soluble or dispersible in water can be used as network formers.
  • SBR styrene-butadiene latex
  • (meth) acrylate latex ethylene-vinyl acetate latex, ethylene / propylene latex, ethylene / propylene-diene latex (EPDM), butadiene-acrylonitrile latex (NBR) , Silicone latex (SI), polybutadiene latex (BR), natural rubber latex or a mixture of two or more of them are used.
  • the latex can be uncrosslinked or crosslinked. It is also possible to use an uncrosslinked latex together with a crosslinking agent. Chemical crosslinkers are used in particular.
  • the molecular weight of the polymer on which the latex is based can be 300 to 1,000,000, preferably 500 to 100,000 g / mol (number average molecular weight, determined by gel permeation chromatography).
  • the subsurface stabilizer (which can also be called a soil stabilizer) can be worked into the subsurface to be consolidated using a milling machine. This eliminates the need to replace the substrate.
  • the subsurface stabilizer in powder or liquid form can be sprayed into the feed area of a milling machine by means of a processor-controlled pump, for example, and mixed with the soil or soil by the milling machine.
  • cement or a further or different binder can be strewn, which can then also be introduced into the substrate.
  • the top road layer can be mixed with the milling machine with the addition of a subsurface hardener according to an exemplary embodiment of the invention. Removal of individual layers can be avoided.
  • a subsurface stabilizer according to an exemplary embodiment of the invention can be advantageous for the substructure and the base course for country roads, federal highways and highways, walkways and cycle paths with and without superstructure, forest, forest and farm roads, parking lots, storage and container areas with / without Superstructure, construction site access, renovation work, preparation of farm roads, gardening and landscaping, stabilization of fly ash, foundations in foundation engineering, taxiways, Access roads and / or the attachment of gravel roads can be used.
  • the remaining (for example at most 70% by weight) of the solidified substrate can be provided by the substrate to be solidified itself.
  • a soil sample the dry bulk density of which has previously been determined, can be supplied with pre-defined energy in a defined vessel using a Proctor compressor (in particular a drop weight with a guide rod) and then the density can be determined.
  • the test can be carried out at least five times with different water contents. If the densities achieved are plotted against the associated water content, a curve results that initially rises, reaches a maximum and then falls again. The The maximum of this curve is the Proctor density of the subsurface with the corresponding optimal water content. Here a connection between compressibility and water content becomes visible.
  • a substantial part of the mixture namely the polymer-based network stabilizer, which can be in the form of a latex polymer
  • the polymer-based network stabilizer which can be in the form of a latex polymer
  • a liquid introduction is preferred since the hydrophobization of the hydraulic binder can then take place in a particularly regulated manner.
  • FIG. 12 shows a container 130 with a subsurface stabilizer 104 and another container 132 of water 108 to be mixed therewith according to an exemplary embodiment of the invention.
  • the subsurface stabilizer 104 can be used to solidify an subsurface 100 (see Figure 2 ), such as a road or a sandy surface.
  • the subsurface hardener 104 has a schematically represented binder 106, for example cement powder or lime powder.
  • the binder 106 can, however, already partially in the underground 100 are. If the binder 106 is completely in the substrate 100, the addition of binder 106 to the substrate consolidator 104 may also be unnecessary.
  • the substrate consolidator 104 described can advantageously be processed with between 2% and 10% by weight of binder 106, based on the substrate 100 to be consolidated.
  • the substrate consolidator 104 shown schematically has between 2% by weight and 3.5% by weight according to the invention % of an elastic, clearly rubber-like, schematically represented polymer network former 102, based on an amount of the binder 106.
  • the network former 102 comprises or consists of a latex polymer (preferably styrene-butadiene latex).
  • the network former 102 can form a polymer network while processing the subsurface hardener 100 with the subsurface 100 and thereby solidify the subsurface, but at the same time give it an elastic and thus crack-resistant and frost-resistant character.
  • an increase in the compressive strength and an increase in the modulus of elasticity of the substrate 100 solidified by means of the substrate consolidator 104 can be achieved at the same time.
  • the amount of network former 102 does not decrease too much (in particular, does not drop far below 1% by weight, based on the amount of binder 106) and does not increase too much (especially not above 6% by weight, based on) on the amount of binder 106).
  • the subsurface hardener 104 located in the container 130 is powdery and does not yet have any water 108, which significantly simplifies its transportation from a production site to a construction site.
  • the subsurface stabilizer 104 can optionally also have a schematically illustrated additive 110 or a certain amount of kaolin.
  • the subsurface stabilizer 104 may preferably be free of stabilizers, a thickener, a defoamer and a salt or hydroxide of an alkali or alkaline earth metal. This simplifies the production of the subsurface hardener 104 without impairing its function and reduces the already low environmental impact of the subsurface hardener 104.
  • the subsurface hardener 104 can be transported from the described components 102, 106, 110 and the water 108 to a construction site in separate containers 130, 132. Mixing of the subsurface hardener 104 with the water 108 can then only take place immediately before being introduced into the subsurface 100, during a separate introduction of subsurface hardener 104 and water 108 into the subsurface 100, or after the subsurface hardener 104 has been introduced into the subsurface 100.
  • Figure 2 shows a substrate 100 which is to be filled and stabilized with a substrate consolidator 104 according to an exemplary embodiment of the invention and the degree of moisture of which is currently being measured by means of a moisture sensor 134.
  • the subsurface hardener 104 shown in the subsurface 100 is first measured by means of the moisture sensor 134, a degree of moisture in the subsurface 100.
  • a moisture degree determination of the material of the substrate 100 to be consolidated is thus carried out by means of the moisture sensor 134 before the substrate is consolidated carried out.
  • the water 108 is only subsequently mixed with the subsurface hardener 104. This measure is based on the knowledge that a solid premixed mixture of subsurface stabilizer 104 and water 108 can be of considerable advantage for subsurface consolidation with regard to pressure stability, crack resistance and durability of the consolidated subsurface 100, regardless of a degree of moisture in a subsurface to be consolidated to use.
  • the amounts of binder 106 and network former 102 added can also be adjusted depending on the current degree of moisture of the substrate 100. For example, shortly before the subsurface consolidation, falling rain, a high groundwater level or a fundamentally high level of moisture in an subsurface 100 can result in only a small amount of water 108 or even no water 108 being added to the subsurface consolidator 104, which is in a solid phase, before this is introduced into the underground 100. In this way, a significantly more flexible consolidation of substrates 100 with variable soil properties can be achieved.
  • Figure 3 shows the container 130 with the subsurface 104 already mixed with a quantity of water 108 according to an example Embodiment of the invention.
  • the amount of network former 102 used, the amount of binder 106 used and the amount of water 108 added is based on a moisture determination of the substrate 100 (cf. Figure 2 ) was determined.
  • the composition of the mixture of substrate consolidator 104 and water 108 can be adjusted flexibly and in an application-specific and precise manner so that a maximum solid subsurface hardening can be achieved.
  • a quantity of water 108, network former 102 and binder 106 is determined, which is introduced into the substrate 100 to be consolidated with the substrate consolidator 104. This is done according to Figure 3 such that the determined amount of water 108 from the container 132 is filled into the container 130 with the previously powdered subsurface solidifier 104 and these components are stirred into a flowable viscous or liquid mass.
  • the first step is according to Figure 1 the polymer-based elastic network former 102 of the subsurface hardener 104 is mixed with the binder 106.
  • a defined amount of water 108 dependent on the degree of moisture is added to the subsurface 104 (in an amount also dependent on the degree of moisture of the subsurface 100 to be solidified) and the resulting mixture is processed to a solidified subsurface 100.
  • the amount of water 108 used is adjusted depending on the nature of the substrate 100. For this, the water 108 is mixed with the subsurface 104, and only shortly before the subsurface hardener 104 is introduced into the subsurface 100 to be consolidated. To be more precise, the water 108 is mixed with the subsurface hardener 104 in a defined amount dependent on the subsurface moisture, immediately before the subsurface hardener 104 is introduced into the subsurface 100 to be hardened.
  • hydraulic binder 106 for example cement
  • polymer-based elastic network former 102 in particular as a polymer suspension
  • the amount of water 108, if any, introduced into the subsurface 104 or the amount of subsurface 104 introduced into the subsurface 100 is such that a maximum of 15% by weight of water, based on the subsurface 100 to be stabilized, is used. Over-watering can be avoided.
  • FIG. 12 shows a substrate 100 filled with the substrate consolidator 104 according to the exemplary embodiment of the invention.
  • the subsurface hardener 100 according to Figure 3 first introduced into the underground 100 (according to Figure 3 and Figure 4 into a cavity 174 of the substrate 100) and, if necessary, brought into a desired shape by rolling or pressing.
  • the network former 102 which was mixed together with the binder 106 and the water 108, is then processed together with the original substrate 100 to form the solidified substrate 100 and thereby solidified.
  • a mixture of a network former 102, a binder 106 and the substrate 100 to be consolidated is first formed. An investigation is then carried out on the mixture. The amount of water 108 to be mixed with the mixture can then be determined based on a result of the examination. The certain amount of water 108 is subsequently mixed with the mixture. This procedure can also be used to create a highly precise mixture.
  • Figure 5 shows a diagram 600 in which a compressive strength in MN / m 2 is plotted after 7 days and after 28 days for a conventionally solidified substrate and for a substrate 100 solidified with a substrate consolidator 104 according to an exemplary embodiment of the invention and according to a comparative example. More specifically, different solidified substrates are plotted along an abscissa 602, whereas the unconfined compression strength in MN / m 2 is plotted along an ordinate 604 after 7 days (left bar in each case) and after 28 days (right bar in each case) .
  • Figure 6 shows one on Figure 5 Related diagram 700, in which the splitting tensile strength is plotted after 7 days and after 28 days for the conventionally consolidated substrate and for the substrate 100 consolidated with the substrate consolidator 104 according to the exemplary embodiment of the invention and according to the comparative example.
  • Figure 7 shows one on Figure 5 and Figure 6 related diagram 800, in which for the conventionally solidified subsoil and for the with the subsoiler 104 according to the exemplary embodiment of FIG Invention and according to the comparative example solidified substrate 100, the modulus of elasticity is applied in MN / m 2 .
  • Figure 8 shows one on Figure 5 to Figure 7 Related diagram 900, in which the linear thermal expansion as a result of the freeze-thaw change is plotted in parts per thousand for the conventionally consolidated substrate and for the substrate 100 consolidated with a substrate consolidator 104 according to the exemplary embodiment of the invention and according to the comparative example.
  • the experimental findings according to Figure 5 to Figure 8 on the one hand reproduce the mentioned data for a reference surface.
  • the reference background is along the abscissa 602 according to Figure 5 to Figure 8 each characterized by the number "1".
  • the reference substrate is a conventional, cement-stabilized substrate.
  • Number "2" in Figure 5 to Figure 8 also relates to a substrate that has been treated with a subsurface stabilizer 104 according to an exemplary embodiment of the invention.
  • This contains a powdery latex-based polymer network former 102 and the cement as binder 106.
  • Number "3" in Figure 5 to Figure 8 also relates to a corresponding substrate, which was processed with a substrate stabilizer 104 according to a comparative example.
  • This contains a powdery latex-based polymer network former 102 in a different amount than in "2" and the cement as binder 106.
  • the reference floor was made from 80% by weight quartz sand (product Siligrans) and 20% by weight quartz powder (product Microsil M300). This soil has a sand content of 80% by weight, a silt content of 17% by weight and a clay content of 3% by weight. It is therefore a silty sand (si SA).
  • Cement II / B-M (C-L) 32.5 R has been used as a binder.
  • the amount of binder was uniformly 3.5% by weight.
  • the polymer-based network former in the amount of 0% by weight, 2.5% by weight and 4.0% by weight with respect to the cement content has been added as an additive.
  • the polymer-based network former 102 (which was added at 0% by weight, 2.5% by weight and 4.0% by weight with respect to the cement content) had a relative proportion of approximately 80% by weight.
  • Styrene-butadiene latex (more generally: 70 to 90% by weight of styrene-butadiene latex), approx. 10% by weight of kaolin (more generally: 2 to 20% by weight of kaolin) and approx.
  • additives 110 10% by weight of other additives 110 (more generally: 3 to 17% by weight) Additives) (it is clear to the person skilled in the art that the sum of the percentages by weight of styrene-butadiene latex, kaolin and additives adds up to 100%).
  • test specimens were produced from these mixtures with the addition of 8% by weight of water and compression according to Proctor conditions in accordance with the standard EN 13286-2: 2012.
  • the first three tests are decisive for assessing the strength of the soil body and the latter test for the frost resistance of the soil.
  • test results are to be listed below and evaluated from a geotechnical point of view.
  • percentage increase compared to the values of the cement-soil mixture without addition of the polymer-based network former is given in brackets.
  • Table 1 uniaxial compressive strength (see Figure 5) sample 7-day strength (N / mm 2 ) 28-day strength (N / mm 2 ) cement 2.3 4.2 Cement + 2.5 mass percent polymer-based network former 2.6 (+ 10%) 5.1 (+ 20%) Cement + 4 mass percent polymer-based network former 1.9 (-21%) 4.2 ( ⁇ 0%) sample 7-day strength (N / mm 2 ) 28-day strength (N / mm 2 ) cement 0.10 0.30 Cement + 2.5 mass percent polymer-based network former 0.17 (+ 70%) 0.33 (+ 10%) Cement + 4 mass percent polymer-based network former 0.10 ( ⁇ 0%) 0.27 (-10%) sample 28-day strength (N / mm 2 ) cement 228 Cement + 2.5 mass percent polymer-based network former 419 (+ 83%) Cement + 4 mass percent polymer-based network former
  • the addition of 2.5% by weight of the polymer-based network former causes an appreciable increase in strength. This is 10% after 7 days and 20% after 28 days.
  • the 7-day value of 2.6 MN / m 2 is only slightly below the requirements for cement-stabilized base layers according to RVS 08.17.01 when adding the polymer-based network former.
  • a significantly higher dose of the polymer-based network former has no positive effect on the compressive strength.
  • the values correspond approximately to those without the addition of the polymer-based network former.
  • the modulus of elasticity (deformation behavior), which is decisive for the deformation behavior, increases very significantly through the addition of 2.5% by weight of the polymer-based network former. There is an 83% higher value and thus a significantly lower deformability, which has an extremely positive effect on the load-bearing capacity.
  • a further increase in the content of the polymer-based network former leads to a somewhat smaller increase of 56% compared to the initial value without the addition of the polymer-based network former.
  • the lower deformability has a positive effect on the dimensioning of the asphalt surface or a concrete surface.
  • the layer thickness or, in the case of the concrete slab (hall construction), the reinforcement content can be reduced accordingly.
  • frost resistance is exorbitantly increased by the addition of the polymer-based network former.
  • the frost increase is reduced by 66% when adding 2.5% by weight and by 74% when adding 4% by weight.
  • the target value of 10% (15 mm for sample height 150 mm) specified for frost-resistant aggregates in ⁇ NORM B 4811: 2013, point 5.4, is in any case notably undercut.
  • the samples are therefore classified as sufficiently frost-resistant after adding the polymer-based network former for roads.
  • the addition of 2% to 3.5% by weight of the polymer-based network former is the optimum from a technical point of view because it can be used to improve compressive strength, splitting tensile strength, modulus of elasticity and frost resistance with little effort.
  • the addition of the polymer-based network former to the cement offers the possibility of stabilizing the existing substructure.
  • the load-bearing capacity can be increased to meet the requirements.
  • the polymer-based network former also has the advantage that the substructure is made frost-proof. Accordingly, frost damage can also be minimized in the future.
  • the existing materials can be left. This eliminates the need for materials and the disposal of materials. By eliminating transports, the construction time and environmental impact can be minimized.
  • the thickness of the frost protection layer can be reduced or limited to a mechanically stabilized base layer (for example 20 cm or less).
  • the frost protection layer can be reduced or limited to a mechanically stabilized base layer (20 cm or less). Increasing the load-bearing capacity also enables an optimized dimensioning of the floor slab by increasing the bedding of the slab.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Agronomy & Crop Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (10)

  1. Procédé de consolidation d'un sol (100), dans lequel pour le procédé :
    un agent réticulant (102) élastique à base de polymère d'un consolidateur de sol (104) avec un liant (106) et de l'eau (108) sont traités pour former un sol consolidé (100) ; et
    une quantité d'agent réticulant utilisé (102), une quantité de liant utilisé (106) et une quantité d'eau utilisée (108) sont définies en fonction d'une nature du sol (100) ;
    dans lequel le consolidateur de sol (104) utilisé pour la consolidation du sol (100) présente :
    le liant (106) ; et
    la quantité de l'agent réticulant (102) élastique, par rapport à la quantité du liant (106), avec lequel l'agent réticulant (102) et l'eau (108) sont traités pour la formation du sol consolidé (100), dans lequel l'agent réticulant (102) présente un polymère de latex ou s'en compose,
    caractérisé en ce que la quantité de l'agent réticulant (102) élastique représente, par rapport à la quantité du liant (106), 2 % en poids à 3,5 % en poids.
  2. Procédé selon la revendication 1, présentant une des caractéristiques suivantes :
    caractérisé en ce que l'eau (108) est mélangée avec le consolidateur de sol (104) en particulier poudreux avant que le consolidateur de sol (104) ne soit introduit dans le sol (100) à consolider, en particulier directement avant que le consolidateur de sol (104) ne soit introduit dans le sol (100) à consolider ;
    dans lequel l'eau (108) est mélangée avec le consolidateur de sol (104) en particulier poudreux, alors que le consolidateur de sol (104) est introduit dans le sol à consolider (100) et/ou après que le consolidateur de sol (104) a été introduit dans le sol à consolider (100).
  3. Procédé selon l'une des revendications 1 à 2, présentant au moins une des caractéristiques suivantes :
    caractérisé en ce qu'un degré d'humidité du sol (100) est déterminé et seulement ensuite sur la base du degré d'humidité déterminé, une quantité déterminée à partir de celui-ci de l'agent réticulant (102), une quantité de liant (106) et une quantité d'eau (108) sont mélangées au consolidateur de sol (104) ;
    dans lequel le liant (106) fait entièrement ou partiellement partie du consolidateur de sol (104) ;
    dans lequel le liant (106) fait partiellement partie du sol à consolider (100).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le consolidateur de sol (104) est introduit sous la forme de poudre ou comme granulat dans le sol (100) à consolider.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que :
    un mélange de l'agent réticulant (102), du liant (106) et du sol (100) à consolider est formé ;
    un examen est réalisé au niveau du mélange ;
    sur la base d'un résultat de l'examen la quantité de l'agent réticulant (102), du liant (106) et de l'eau (108) à mélanger au mélange est déterminée ;
    la quantité déterminée d'agent réticulant (102), de liant (106) et d'eau (108) est mélangée au mélange.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'agent réticulant (102), en particulier à sec ou dans une suspension aqueuse, et le liant (106) sont séparés l'un de l'autre et sont incorporés sans prémélange dans le sol (100) à consolider.
  7. Consolidateur de sol (104) pour la consolidation d'un sol (100), dans lequel le consolidateur de sol (104) présente :
    un liant (106) ; et
    une quantité d'un agent réticulant (102) élastique, par rapport à une quantité du liant (106), avec lequel l'agent réticulant (102) et de l'eau (108) peuvent être traités pour la formation du sol (100) consolidé, dans lequel l'agent réticulant (102) présente un polymère de latex ou s'en compose,
    caractérisé en ce que la quantité de l'agent réticulant (102) élastique représente, par rapport à la quantité du liant (106), 2 % en poids à 3,5 % en poids.
  8. Consolidateur de sol (104) selon la revendication 7, présentant au moins une des caractéristiques suivantes :
    caractérisé en ce que le liant (106) est sélectionné à partir d'un groupe qui se compose de ciment et de chaux ;
    dans lequel le consolidateur de sol (104) se présente de manière sèche, en particulier est poudreux ;
    dans lequel le consolidateur de sol (104) se présente sous forme de suspension ;
    dans lequel le consolidateur de sol (104) est exempt d'au moins un à partir d'un groupe se composant de stabilisateurs, d'un épaississant, d'un agent antimoussant, et d'un sel ou hydroxyde d'un métal alcalin ou alcalinoterreux ;
    dans lequel le polymère de latex est du latex de styrène et de butadiène.
  9. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'entre 2 % en poids et 10 % en poids de liant (106) sont utilisés par rapport au sol (100) à consolider.
  10. Procédé selon la revendication 9, caractérisé en ce qu'au plus 15 % en poids d'eau (108) sont utilisés par rapport au sol (100) à stabiliser.
EP18158963.1A 2017-02-27 2018-02-27 Stabilisation des sols modifiée par polymères Active EP3366843B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18158963T PL3366843T3 (pl) 2017-02-27 2018-02-27 Modyfikowana polimerami stabilizacja gruntu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017104084.6A DE102017104084A1 (de) 2017-02-27 2017-02-27 Polymermodifizierte Bodenstabilisierung

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EP3366843A1 EP3366843A1 (fr) 2018-08-29
EP3366843B1 true EP3366843B1 (fr) 2020-06-17

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EP (1) EP3366843B1 (fr)
DE (1) DE102017104084A1 (fr)
PL (1) PL3366843T3 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045026B1 (fr) 1980-07-29 1985-01-16 becker bau GmbH & Co. KG Procédé de stabilisation du sol
DE102004009509A1 (de) 2004-02-27 2005-09-15 Basf Ag Verfahren zum Verfestigen sandhaltiger Böden
DE102008016325A1 (de) * 2008-03-28 2009-10-01 Poligate Ltd. Boden- oder Fundamentverfestiger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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DE102017104084A1 (de) 2018-08-30
EP3366843A1 (fr) 2018-08-29
PL3366843T3 (pl) 2020-12-14

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