KR20060089025A - Road compound and method of soil for soil-cement pavement - Google Patents

Abstract

The purpose of the present invention is to create an eco-friendly dirt pavement that can harmonize with the surrounding natural landscape using natural soil, unlike conventional asphalt and cement concrete pavement, which is more economical and has the required strength and durability. Soil solidification method and the addition to the soil is to develop a solidified material that can improve the strength and durability to support the required load. In addition, the solidified material of the present invention can be variously applied not only for soil pavement roads, but also for stabilization of slopes when cutting, shear surfaces of soil dams, canals, waterways, and lining of rivers.

Dirt, Road, High Fire, Eco Friendly, RC

Description

Road Compound and Method of Soil for Soil-Cement Pavement             

1 is compressive strength according to the water content of viscous soils

2 is compressive strength according to the water content of sandy soil

3 is compressive strength according to RC mixing rate of viscous soil

4 is the compressive strength according to RC mixing rate of sandy soil

5 is compressive strength according to NRC mixing rate of viscous soil

6 is compressive strength according to NRC mixing rate of sandy soil

Techniques to improve the properties of soils on the pavement are to improve the shear strength, increase the density and decrease the permeability coefficient of the soil by external compaction at the optimum ratio of soil and water, and the mechanical action. In addition to the effects of chemicals, soil and inorganic and organic chemicals can be mixed with water to create new reaction products in the soil, filling the voids between the soil particles or enhancing the electrostatic attraction between the soil particles. There is a method of improving soil properties by the method.

 The first method of mechanical compaction has been used for a long time in soil engineering until now, but the second chemical method is called soil stabilization material or soil solidification material in Korea. Since the characteristics vary depending on the composition, and the effects vary depending on the soil quality, stable quality and common construction methods have not been proposed.

 In addition, since most of the existing fires developed in Korea have not had much domestic demand until recently, their performance and price are lower than those of other countries, and sufficient research and application methods for on-site application have not been developed. We do not have and problem on use is raised.

 In addition, most of the existing soil solidification technologies are developed and used mainly for metropolitan subway construction, Yeongjong-do Incheon International Airport development, and shoreline ground improvement construction. New technology development for solidification is needed.

The present invention relates to a method of solidifying surface and base soils of a pavement and development of solidified fires. Target soils such as sandy soils and viscous soils used as paving soils, water and cement-based solidified materials are usually Portland cement, Irwin (CSA-based). , A mixture of anhydrous gypsum (or sodium sulfate) and inorganic salts, and a mixture of aluminum sulfate and sodium carbonate were used. Such solidified materials are mixed in an optimum formulation that can satisfy the strength and durability required for the surface pavement and base of road pavement, and are insoluble calcium sulfoaluminate or ethrinzai initially by hydration of the solidified material and water. Soil solidification method and solidification method of soil pavement road through physical solidification using chemical action solidification and pavement machinery to generate maximum hydrate of needle-like needle structure to fill gaps between soil particles tightly To provide a description of how to make a fire.

The soil paving road solidified material for achieving the object of the present invention is a cement-based solidified material, firstly, a first mixture such as ordinary portland cement or mixed cement (blast furnace slag cement and fly ash cement) and Irwin (calcium sulfoaluminate system, CSA), anhydrous gypsum (or sodium sulfate), and a second mixture of inorganic salts were mixed, which will be referred to as Road Compound (hereinafter referred to as RC). Second, the first mixture was composed of a second mixture of aluminum sulfate and sodium carbonate, which will be referred to as New Road Compound (hereinafter referred to as NRC).

 In addition, the soil mixed with the solidified road for pavement is intended to be classified into sandy soil and viscous soil presented in the unification classification method, and the amount of water used was determined based on the optimum water content ratio determined by the soil test.

 The soil paving road to which this fire can be applied can be applied to national roads and local roads as well as pavement roads of neighboring living spaces such as bicycle paths, parking lots, plazas, parks and sports facilities.

 The components of the material constituting the road compound of the present invention is composed of 70 to 95% of cement, 5 to 30% of RC, and 25 to 75% of gross weight of RC, and anhydrous gypsum. Or sodium sulfate), consisting of 25-75% of inorganic salts, 90-95% of New Road Compound cement, 5-10% of NRC, and 50% of sodium carbonate and aluminum sulfate, respectively. The one prepared in% was used.

 The reason for the wide range of materials used for the solidified materials as described above is that the amount of usage is determined by the strength required by the purpose of the soil pavement to which the solidified materials are applied, and the durability characteristics such as dry shrinkage cracking and watertightness. Because.

 Table 1 shows the chemical composition of the typical RC and NRC in the various mixing properties of the solidified materials as described above.

The following is an example applied through experiments on viscous soils and sandy soils according to various mixing characteristics of the solidified material.

Target Sample

  Table 2 shows the constituent materials and chemical composition of cohesive and sandy soils used in the test. In addition, the particle size distribution characteristics of the target soil are shown in Table 3, and the physical and mechanical characteristics of the target soil are shown in Table 4.

<Example>

 In the case of RC, the strength characteristics according to the mixing condition of soil and solidified material on the cohesive soil road were 5 levels (15, 20, 25, 30, and 35%) in water content, and in the case of sandy soils. The water content ratio (weight ratio of water to weight of soil) was carried out at four levels (10, 15, 20 and 25%) to determine the optimum water content ratio of 25% viscous soil and 15% sandy soil. In addition, for each optimum function ratio, clay soils have 4 levels of RC mixing rate (10, 20, 30, and 40%) for solid fire weight, and sandy soils have 2 levels of RC mixing rate for solid fire weight (20 and 30%). 3 and 4 show the compressive strength characteristics by changing

 In case of NRC, the optimum function ratio of 25% clay and 15% sandy soil was determined through preliminary experiments. In addition, FIG. 5 shows that the experiment was performed at 20 and 25% of OPC + NRC / SOIL with respect to the determined optimum function ratio of viscous soils. The OPC + NRC / SOIL was fixed at 15% and NRC / OPC + NRC for the optimum function ratio of sandy soil. Figure 6 shows the experiment by mixing the mixing ratio of 0, 1.5, 3.0, 4.5 and 6.0%.

 Through the above embodiments, the solidification strength characteristics vary depending on the mixing ratio of the solidified material to the soil, the mixing ratio of cement and RC to the solidified weight, the type of soil, and the water content of the soil in the range of 3 to 25 MPa. The optimum mix should be determined according to the purpose of the pavement.

Unlike the existing asphalt and cement concrete pavement through the present invention, by using the soil in the natural state in harmony with the surrounding natural landscape, to create an eco-friendly dirt pavement that can be more economical, having the required strength and durability In addition, it is possible to obtain a resource saving effect by using soil existing in the road site as a material and an air shortening effect by simplifying the road pavement process.

 In addition, the solidified material of the present invention can be variously applied not only for soil pavement roads, but also for stabilization of slopes when cutting, shear surfaces of soil dams, canals, waterways, and lining of rivers.

Claims (2)

Common Portland cement or mixed cement (blast furnace slag cement and fly ash cement) combined with Arwin, anhydrous gypsum (or sodium sulfate) and inorganic salts A method of producing solidified material (NRC) by mixing aluminum sulfate and sodium carbonate in an arbitrary amount of fly ash cement) A method of solidifying soil through compaction by mixing soil (sandy clay, viscous soil, etc.) and arbitrary amount of solidified material developed in claim 1 with water according to required compressive strength and durable performance.

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