KR100407119B1 - The method of constructing the surface layer of road by soil cement - Google Patents

Abstract

Unlike conventional pyrotechnics, which use only soil as the base material in the solidification method, add 70 wt% to 80wt% of crushed stone to the soils generated at the construction site. (potassium alum type), gypsum, microsilica powder as a main component, ordered and cryoprotectant and liquid hardener with zinc stearate and gelatinous tannic acid as ingredients, and mixed with a hardened soil construction mortar on the substrate It relates to the construction method of the road surface layer by the solidification method, which is completely solidified after placing and shaping with voltage compaction.

Description

Road surface layer construction method by the high soil soil method {THE METHOD OF CONSTRUCTING THE SURFACE LAYER OF ROAD BY SOIL CEMENT}

The present invention uses the soil and stones generated at the construction site to classify them directly into a base material and add cement, hardener, ordering and freezing agent, and a liquid curing agent. The work relates to the construction of road surface layers such as mountain roads, forest roads, concentrations, etc. Specifically, by adding a considerable amount of fine aggregate to the field soil, the compressive strength, shear strength, and abrasion resistance required as essential functions of the road surface are physically Calcium hydroxide by increasing the dispersibility of calcium hydroxide due to ethrinite formation reaction and addition of siliceous component by solidifying agent composed of PSA (potassium alum), gypsum and microsilica Strength of solidified body by improvement of watertightness by densification of tissue by activation of pozzolanic reaction Enhancement and water repellency, and the addition of gypsum prevents the reduction of solidified body strength due to humic acid such as humic acid in the soil. The present invention relates to a road surface layer construction method capable of improving the strength, abrasion resistance, water resistance, and anti-freezing properties by promoting the reaction between the soil particle component and the granular particle, thereby further strengthening the bonding force between the soil and the fine aggregate.

Road construction structures such as roadways, forest roads, mountain roads, and sidewalks, which require a conventional surface layer as a finishing layer and require long-term exposure and contact, have similar strength (150-200kg / ㎠), wear resistance, freeze-thawing resistance, and water resistance. However, the surface layer of the road surface, which is based on the soil by conventional solidification method, only occurs when the load passes, stops and starts when the vehicle passes through due to the slippery and low strength of the surface. It is not easy to damage the surface as well as wear due to shear impact, so it is easily cracked due to freezing and melting in winter, or it is short in durability due to tissue breakdown.

In addition, when the road slope is large, it will be difficult to drive the vehicle. However, low strength and abrasion resistance are weak.

Therefore, it is hardly used for the construction of the surface layer of the road by the soil-based construction method.

The present invention has an object to provide a road surface layer construction method that solves the problems of the road surface layer by the solidified soil method treated with cement and an elevation agent using only the soil as a base material and the soil and soil generated in the construction site as a means to solve this problem By adopting the base material mixed with the crushed aggregates crushed stone in a certain ratio, it provides a basic skeleton to increase the strength of compressive strength and shear strength by the interlocking effect of the crushed aggregates with high strength and filling the gap between the aggregates Soil is added to the high-strength strength of cement, which is commonly used, to prevent the cracking caused by dry shrinkage stress when drying solids, and by humic acid (huminic acid, etc.) normally contained in soil. It solves the reduction of strength and generates a large amount of ethrinite during the hydration process and grows into needle crystals in the solidified body gap. Calcium hydroxide can participate more actively in the pozzolanic reaction by forming a dimensionally linked skeletal structure to fill gaps and thus increase the orderability, especially the microsilica of the solidifying agent has the function of the sieve material and the function of promoting the hydration reaction of cement due to the fine particles. By increasing the compactness of the tissue by promoting the overall hydration reaction to increase the degree of ordering, and the addition of the order and cryoprotectant used in conjunction with the solidifying agent to improve the dispersibility and adhesion between the colloidal particles Freeze protection can be given by maximizing water quality and improving watertightness, and the addition of liquid hardener activates the ionic reaction between soil particle and crushed stone particles, thus improving the road surface layer which can improve higher strength wear resistance and freeze protection. In providing the construction method I will have.

The present invention relates to a road surface layer construction method that solves the problems of the road surface layer by the solidified soil method, which is treated with cement and a hardener using only soil as a base material, by adjusting the amount of soil and stones generated at the construction site by a certain weight ratio. It is based on soil and fine aggregates that are crushed and classified with a mobile concrete mixing feeder (Domestic Utility Model Publication No. 0197769). It relates to a road surface layer construction method by the solidification method which adds, stirs and mixes mixed mortar mortar to solidify for a predetermined period of time (14-28 days) after pouring voltage.

First, the mixing weight ratio of the soil and the crushed aggregate that is the base material is in the range of 20-30 wt% of soil and 80-70wt% of crushed aggregate, and 10-12 parts by weight of cement for cement and 100 parts by weight of powder solidifying agent based on 100 parts by weight of the base material. Add part 0.06-0.15 parts by weight, order and cryoprotectant, water diluent liquid hardener, and 2-3 parts by weight, and solidify hardened soil construction mortar mixed with agitation on the base layer for a certain period of time (14-28 days). It relates to a road surface layer construction method by the solidified soil method characterized in that.

The above-mentioned method of carrying out the mortar for road surface layer formation on the actual site shows that the solidified layer which is exposed for a long time like the road surface layer has the physical and chemical properties that can express the strength almost similar to that of general concrete 150-200kgf / ㎠. Since it is necessary to meet the intermediate construction method between the hardening method and the concrete method, the emphasis is on the construction considering both soil and concrete properties.

Therefore, the construction soil should be laid on the base with a lower water content than the concrete slump and then the joint construction between the road opening boundary and the boundary stone with the individual voltage compaction equipment (convecto). After 40 minutes to 1 hour, base layer (1st floor) is compacted by bipedal roller according to static process.

Surface compaction (2F) compaction should be done with the same equipment voltage compaction method as the 1st floor.

After 40 minutes-1 hour, finish with voltage compaction with a tamping roller.

In the above, the base layer may be formed by coarse stone or crushed stone to form a base layer. If the ground layer is of high strength, the ground layer may be removed and the compacted layer may be formed as a base layer. As the crushed stone, the particle size of 1cm or less is used, and the water content of the base material is 8-12% range, but it may have more water content depending on the characteristics of the soil, but the water content is limited to the amount of water diluted when the liquid hardener is added. I can regulate it.

In addition, the constituents of the solidifying agent added in the above method are the expansive cement of CSA (calcium sulphoaluminate) having the chemical composition of Table (1), PSA (potassium alum system) having the chemical composition of Table (2) and gypsum, table A powder solidifying agent composed of microsilica having the chemical component of (3), whose weight composition ratio is as follows.

Composition ratio of composition of solidifying agent

CSA Cement 76%

PSA 14%

Gypsum 7%

Microsilica 3-6%

When the function of each component of the solidifying agent is usually used in soil cement (Portland cement is the most commonly used, but there is a limit to apply to soils containing organic matter, such as viscous soils, high-molecular soil soils of high water content.

In addition, there are problems such as cracking caused by dry shrinkage, slow purification rate and low tensile strength, which always occur in solid cement cement.

As a solution, by using the expanded cement CAS as a main component of the solidified body, the problems arising in the small cement method of the fortran cement can be solved.

Since CSA cement _{(3CaO · 3Al 2 O 3 ·} CaSO 4) are substantially similar to all of Na and Si components of the brother of (hauyne) calculated by the nature in which the compound is substituted by Ca and Al to the crystal structure of the younger the brother of The function of CSA cement is that ethrinite is produced rapidly from the beginning of the hydration process. The rapid formation of ethrinite requires a large amount of water, so it removes a large amount of pore water from the gap in the soil and lowers the water content. At the same time, the gap is grown into needle crystals to form a three-dimensionally connected skeletal structure to fill the gap.

In addition, the intertwining of ethrinzite crystals increases the high strength between the earth particles, leading to an early strength, and after the hydration of the fast-growing component, extra C ₃ S is actively hydrated. -gel: CSH gel) increases the densification and strength of tissues by filling gaps in the ethrinzite skeletal structure formed between unhydrated particles.

In addition, since the effect of humic acid does not significantly affect the development of strength by the formation of ethrinite, it is effective in the ordered layer solidification method including intrinsic substrate soil.

In addition, the advantage that the CSA-based expandable cement is used in the ordered layer hardened soil process is usually more expandable than the Portland cement.

In general, cracking occurs due to dry shrinkage when hardening the cement in the air, which adversely affects the durability of the soil cement.

However, in CSA cement, edrinzite, an expandable hydrate, is rapidly generated at the initial hydration to generate the expansion pressure of the soil cement reinforcement, and this expansion pressure compensates for the cement water stress and prevents cracking of the road surface layer. .

In addition, when a certain amount of anhydrous gypsum (CaSO ₄ ) is added to the CSA cement, condensation time is shortened by consuming a large amount of pore water to promote hydration.

In order for the hydration reaction of CSA to proceed, a certain concentration of SO ₃ should be present. When an appropriate amount of anhydrous gypsum is added, the hydration reaction of CSA and the hydration of C ₃ S are promoted to produce more ethrinite, resulting in a more compact solid. can do.

CaSO ₄ in the solidifying agent used in the present invention may be referred to as an organic resistant solid.

In soil cement, organic matter contained in soil inhibits the hydration of cement.

Humic acid and fulvic acid in organic matter react with calcium hydroxide produced by the hydration reaction of cement to produce calcium humic acid, and this product destroys unhydrated cement particles. Hydration is inhibited.

This phenomenon, in turn, reduces the strength of the solidified body in the solidified soil method in which cement is added.

This phenomenon is similar to the lime added with cement in the solidification method.

The component used to solve the above problems is that gypsum contains a large amount of sulfur trioxide (SO ₃ ) as its characteristic composition.

SO ₃ is contained in the form of hemihydrate gypsum (CaSO ₄ .0.5 H ₂ O) or dihydrate gypsum (CaSO ₄ · 2H ₂ O).

The improvement effect is improved by adding an appropriate amount of gypsum to a general potent cement. The reactive alumina in gypsum and soil produces ethrinite (3CaO3Al ₂ O ₃ , CaSO3 ₂ H ₂ O). This is because a large amount of crystal water is absorbed to reduce the water content, and at the same time, the ethrinzite crystals fill the gaps of the soil particles to make the hardened body compact.

In addition, since the effect of humic acid does not significantly affect the development of strength due to the production of ethrinite, even if some humic acid is included in the soil by gypsum, it does not affect the strength of the road surface layer.

In addition, as a component of the hardener, microsilica is a component that can greatly reduce the amount of cement. In the soil treated with concrete or cement-based hardener, microsilica functions as a filler and an accelerator of hydration reaction of cement.

Since microsilica is a spherical particle of about 1-3㎛, it plays a role of gap. In the cement hydration reaction, the pozzolanic reaction requires calcium hydroxide. In the absence of microsilica, calcium hydroxide exists in large chunks and is relatively attached to small particles. The chemical reaction to the next step is inhibited.

In the presence of microsilica, however, microsilica plays a role in breaking up the calcium hydroxide mass, thereby facilitating the overall hydration reaction by allowing the calcium hydroxide to participate more actively in the pozzolanic reaction.

In addition, the order and freeze protection agent added to the solidified mortar in the present construction method is 20-30 wt% of gelatin zirtan tannin acid added to zinc stearate, and zinc stearate has excellent dispersibility between colloidal particles, which is a characteristic of fatty acids, Tannin acid added acts as a gel stabilizer to have perfect adhesion between the earth particles, preventing the elongation of the coating film, thereby maximizing the orderability and having an excellent effect on preventing freezing of the order layer.

The liquid curing agent is obtained by adding 10-20 wt% of SBR latex and 3-5 wt% of cellulose derivatives obtained by the reaction of alkaline cellulose and ethylene chlorohydrin to a polymerized product of an alkali silicate (pottassium silicate) metal oxide. A water dilution liquid binder which dilutes the liquid curing agent with water at 15% -20wt%, and uses 2 to 3 parts by weight based on 100 parts of the base material instead of the binding water required for solidification. The curing agent ionizes the bond between soil and fine aggregates. By strengthening, it is possible to improve the strength, abrasion resistance, water resistance and freeze protection, and also increase the boundary tension between soil and fine aggregate soil and soil particles, and make the wetted coating well, and by electrostatic (aggregate-static) manpower. It also enhances adhesion between soil and fine aggregates.

The road surface construction method by the solidified soil method of the present invention described above can be specifically understood, and examples have been given in order to examine the effect thereof.

Example (1)

80 wt% of crushed stone crushed to 0.1cm or less is mixed with 2wt% acidity generated at the construction site as a base material, and 10 parts by weight of cement, 6 parts by weight of powder solidifying agent, order and freezing agent 0.1 by weight of 100 parts by weight of crushed material. 3 parts by weight of water-dilution liquid curing agent was added, and sufficient stirred and mixed solidified mortar was placed on the substrate, and then molded and solidified for about 28 days.

Here, the pulverized classification mixing and mixing means used a concrete mixing feeder (Utility Model No. 0197769), and the compaction method after pouring was used a personal voltage compacting equipment (conductor), a roller, a temp pre-roller and the like.

After 15 days of construction, the compressive strength was 152,36kgf / ㎠, the permeability coefficient was 3.7x10 ^-8 cm / sec, and the compressive strength was 173,27kgf / ㎠ and the permeability coefficient was 1,10x10 ^-8 cm / after 30 days. appeared in sec.

In the solidified soil method of the present invention, by using a considerable amount of crushed stone mixed with soil, the primary interlocking force of the crushed stone having high strength can express physically significant compressive strength, shear strength, and abrasion resistance. By using expandable CSA-based cement, it is possible to prevent cracking due to dry shrinkage, and to prevent the reduction of strength of solidified body by humic acid (huminic acid) by adding gypsum. It is possible to increase the water quality and to maximize the order (watertightness) with excellent dispersibility and adhesiveness by using the degree of ordering and cryoprotectant composed of zinc stearate and tannic acid in the manufacturing process, and also because water cannot penetrate into dense tissue Excellent anti-freezing function allows the use of liquid binders to Tissue densification by ionic reaction, abrasion resistance and freeze-prevention characteristics as compared to conventional concrete strength 150-200kgf / ㎠ as in the example, and the permeability coefficient is almost low, so that the water permeability is close to zero. And it can be said that the construction method of the road surface layer by the hardening soil method that can satisfy the function as the road surface layer without cracks or tissue breakdown phenomenon caused by melting.

Claims (2)

When constructing the surface layer by the solidification method, it is composed of 20-30wt% of soil and 70-80wt% of crushed stone as the base material. -8 parts by weight, order and cryoprotectant 0.06-0.15 parts by weight, water dilution hardener 2-3 parts by weight mixed and stirred mixed soil construction mortar on the base layer to compact the voltage and completely solidified after shaping Construction method of road surface by solidified soil method. The polymer according to claim 1, wherein the water dilution hardener is 10-20 wt% of SBR latex, 3-5 wt% of a cellulose derivative obtained by the reaction of alkaline cellulose and ethylene chlorohydrin, and the remainder polymerizes the alkaline silicate metal oxide. Method for the construction of the surface layer of the road by the solidified soil method, characterized in that the liquid curing agent diluted 15-20wt% in water consisting of.