KR20160134209A - A eco-friendly concrete retaining wall block composition and eco-friendly concrete retaining wall blocks manufactured by using the same - Google Patents

Abstract

The present invention relates to an environment-friendly concrete retaining wall block composition and an environment-friendly concrete retaining wall manufactured using the same. The environment-friendly concrete retaining wall block composition in accordance with the present invention, comprises: 250-300 parts by weight of blast furnace slag cement; 100-600 parts by weight of fine rubble aggregate; 100-600 parts of blast furnace aggregate; 400-800 parts by weight of stone flour; 50-100 parts by weight of water; and 0.5-5 parts by weight of a fiber reinforcement (natural hemp fiber) or 2-10 parts by weight of latex, which is used as an admixture. According to the present invention, the concrete retaining wall block with increased bending stiffness can be manufactured by mixing the blast furnace slag aggregate which is an industrial byproduct generated in steel manufacturing processes, the stone flour, and the fiber reinforcement or the latex which is used as an admixture at an optimum mixing ratio. In addition, the concrete retaining wall block is manufactured in a block shape, thereby maintaining the strength of a retaining wall constructed on a roadside slope, a bank, a riverside, a complex wall surface for landscaping, an inclined surface with a steep slope, etc. Moreover, the concrete retaining wall block is designed to include a vegetation space in the retaining wall, thereby enabling growth and development of plants.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-friendly concrete retaining wall block composition and an eco-concrete concrete retaining wall block using the eco-concrete concrete retaining wall block composition.

The present invention relates to an eco-friendly concrete retaining wall block composition and an eco-friendly concrete retaining wall block manufactured using the same. More particularly, the present invention relates to an eco-friendly concrete retaining wall block composition comprising a blast furnace slag aggregate, Friendly concrete retaining wall block having an increased bending strength by mixing at an optimum mixing ratio, thereby forming an optimum environment for growing the plant, and at the same time, achieving a structural ecological stability of the ground, and an eco-friendly concrete retaining wall block composition To an eco-friendly concrete retaining wall block.

Concrete retaining walls are constructed to stabilize slopes in embankments and cut-offs of roads and railways, river embankments, slopes in coastal roads and residential areas.

Generally, the retaining wall is constructed by the installation method of field installation method. The field installation type method is such as ground excavation, foundation concrete installation, reinforcing structure assembly and formwork corresponding to the retaining wall structure, concrete pouring in the formwork, backfill construction do.

In this method, the reinforcing structure of the concrete is placed on the ground based on the preliminary design. Also, it takes much time to cure the concrete that has been placed in the form of self-supporting and back-filling. The construction period will be longer.

However, due to this, it takes a lot of construction cost, and in the case of river and slope slope, workers are exposed to a lot of risk when installing the formwork, and a long-term vehicle restriction is required, so that there is a great inconvenience to citizens and a risk of safety accidents.

On the other hand, the conventional retaining wall block does not perform functions other than the slope protection, and provides a visual effect that the river is cleanly maintained at the time of installation. However, since there is no room for the plant to grow, The desertification phenomenon of the desertification has accelerated and it is not a natural-friendly structure.

Recently, as the land use of the river basin increases and the urbanization progresses, the river environment is also significantly changed. Especially, in the case of urban rivers with high land use density around the rivers, the river environment is well harmonized with the surrounding environment due to the maintenance of the reservoir and the highland site for the purpose of flood communication, the construction of the road and the construction of the river bank It is a trend that it is trying to approach green environment by establishing a green area to be able to live, but it is reality that plants can not live and it needs environment-friendly retaining wall structure.

Therefore, it is possible to efficiently provide the space that can effectively take into account the river environment and the natural influx of the existing wildlife, and it is also possible to provide the vegetation and microorganisms, the underground creatures It is required to develop a retaining wall block which has a function of degrading the environmental load such as providing a stable vegetation space in order to promote the activation of the plant, while solving the fundamental problem of structural stability.

Domestic registered patent No. 10-1058892 (registered on August 17, 2011) Korean Registered Patent No. 10-0525156 (registered on October 24, 2005) Domestic registered patent No. 10-1258821 (registered on April 23, 2013)

The present invention relates to an eco-friendly concrete retaining wall block composition capable of producing a concrete retaining wall block having increased bending strength by mixing blast furnace slag aggregate as an industrial by-product produced in a steelmaking process, fiber reinforcing material or latex used as an admixture, .

In addition, the present invention can be manufactured in a block form, and it is possible to maintain the strength of the retaining wall constructed on the road slope side, the bank, the underground, the landscape wall surface, the steep slope, and the like, To provide a retaining wall block.

The present invention also provides an eco-friendly concrete retaining wall block capable of promoting ecological stability and providing a foundation for plant settlement and growth.

The various problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

The green concrete retaining wall block composition according to the present invention comprises a fiber reinforcing material used for blast furnace slag cement, crushed stone fine aggregate, blast furnace slag aggregate, limestone, water and admixture, wherein the blast furnace slag cement is 250-300 parts by weight, 100 to 600 parts by weight of the blast furnace slag aggregate, 100 to 600 parts by weight of the blast furnace slag aggregate, 400 to 800 parts by weight of the limestone, 50 to 100 parts by weight of the water, and 0.5 to 5 parts by weight of the fiber reinforcing material.

The blast furnace slag aggregate has a maximum particle diameter of 8 mm. The granite may be used in the form of powder in the form of natural stone, or may be a circulation fine aggregate generated in the crushing of waste concrete, and natural fiber may be used as the fiber reinforcement.

Also, the eco-friendly concrete retaining wall block composition according to the present invention comprises latex used as blast furnace slag cement, fine aggregate, blast furnace slag aggregate, water and admixture, wherein the blast furnace slag cement is 250-300 parts by weight and the crushed fine aggregate is 100 100 to 600 parts by weight of the blast furnace slag aggregate, 400 to 800 parts by weight of the limestone, 50 to 100 parts by weight of water, and 2 to 10 parts by weight of the latex.

The latex may be selected from the group consisting of styrene butadiene rubber (SBR), ethylene vinyl acetate (EVA), poly-acrylic ester (PAE), polyvinyl acetate (PVA) Styrene polyvinyl chloride, natural rubber, polybutadiene, nitrate rubber, aldehyde type resin, acrylic copolymer, vinyl acetate ethylene Any one selected from the group consisting of vinyl acetate ethylene copolymer, vinylidene, vinyl chloride copolymer and epoxy resin latex or a mixture thereof may be used .

Also, the eco-friendly concrete retaining wall block according to the present invention comprises 250 to 300 parts by weight of blast furnace slag cement, 100 to 600 parts by weight of crushed stone fine aggregate, 100 to 600 parts by weight of blast furnace slag aggregate, 400 to 800 parts by weight of stones, 50 to 100 parts by weight of water And 0.5 to 5 parts by weight of natural habit fibers, mixed with a forced fan mixer, and cured. The concrete retaining wall block has a flexural strength of 3 to 5 MPa and a compressive strength of 23 To 38 MPa, and the pH is in the range of 9 to 11.

The bending strength was 100 mm × 100 mm × 400 mm. After the initial curing at 23 ± 2 ° C and the relative humidity of 58% for 24 hours, the specimens were demolded and cured in water at 23 ± 2 ° C for 28 days. The specimens having a diameter of 100 mm and a height of 200 mm were prepared and subjected to initial curing at 23 ± 2 ° C. and relative humidity of 58% for 24 hours, followed by demolding at a temperature of 23 ± 2 ° C. The pH can be measured after initial curing at 23 ± 2 ° C and a relative humidity of 58% for 24 hours.

Also, the eco-friendly concrete retaining wall block according to the present invention comprises 250 to 300 parts by weight of blast furnace slag cement, 100 to 600 parts by weight of crushed stone fine aggregate, 100 to 600 parts by weight of blast furnace slag aggregate, 400 to 800 parts by weight of stones, 50 to 100 parts by weight of water And 2 to 10 parts by weight of latex, and mixing the mixture with a forced fan mixer, and curing the mixture, wherein the concrete retaining wall block has a flexural strength of 4 to 9 MPa and a compressive strength of 30 to 38 MPa , And the pH is in the range of 10 to 11. [

The bending strength was 100 mm × 100 mm × 400 mm. After the initial curing at 23 ± 2 ° C and the relative humidity of 58% for 24 hours, the specimens were demolded and cured in water at 23 ± 2 ° C for 28 days. The specimens having a diameter of 100 mm and a height of 200 mm were prepared and subjected to initial curing at 23 ± 2 ° C. and relative humidity of 58% for 24 hours, followed by demolding at a temperature of 23 ± 2 ° C. The pH can be measured after initial curing at 23 ± 2 ° C and a relative humidity of 58% for 24 hours.

The details of other embodiments are included in the detailed description.

The eco-concrete retaining wall block composition according to the present invention can be manufactured by mixing the blast furnace slag aggregate, an industrial by-product generated in a steel making process, a fiber reinforcing material or latex used as an admixture with an optimum mixing ratio, .

In addition, the eco-concrete concrete retaining wall block composition according to the present invention is manufactured in a block form to maintain the strength of the retaining wall constructed on the slope side of the road, the embankment, the lower wall, the landscape wall surface and the steep slope, Plant growth is possible.

In addition, the eco-friendly concrete retaining wall block composition according to the present invention can effectively solve the instability of the retaining wall structure, provide ecological stability, and establish a foundation for plant fixation and growth.

It will be appreciated that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

1 is a photograph showing a natural fiber used as a fiber reinforcing material in an environmentally-friendly concrete retaining wall block composition according to the present invention.
FIG. 2 and FIG. 3 are photographs showing a process of mixing the compositions using a forced direct fan mixer in the production of the concrete of the environmentally-friendly concrete retaining wall block according to the present invention.
4 is a photograph showing a process of manufacturing a columnar specimen in an environmentally-friendly concrete retaining wall block according to the present invention.
5 is a photograph showing a columnar specimen manufactured in the eco-friendly concrete retaining block according to the present invention.
FIG. 6 and FIG. 7 are photographs showing a state in which a footstep type specimen is manufactured to measure the bending strength in the environmentally-friendly concrete retaining wall block according to the present invention
8 is a photograph showing that a specimen is cured under water in a curing room in an eco-friendly concrete retaining wall block according to the present invention.
9 is a photograph showing a capped specimen for measuring compressive strength in an environmentally-friendly concrete retaining wall block according to the present invention.
10 is a photograph showing a test of compressive strength of a specimen in an environmentally-friendly concrete retaining wall block according to the present invention.
11 is a photograph showing a pH meter used in an eco-friendly concrete retaining wall block according to the present invention.
12 is a photograph showing the distribution of distilled water in a specimen in an eco-friendly concrete retaining wall block according to the present invention.
FIG. 13 is a photograph showing the pH of the specimen in the eco-concrete concrete retaining block according to the present invention.
14 is a graph showing the results of the bending strength test in the eco-friendly concrete retaining wall block according to the present invention.
15 is a graph showing the compressive strength test results of the eco-friendly concrete retaining wall block according to the present invention.
16 is a graph showing the pH test results of the eco-friendly concrete retaining wall block according to the present invention.

Advantages and features of the present invention, and methods of accomplishing the same, will be apparent from and elucidated with reference to the embodiments described hereinafter in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, the eco-friendly concrete retaining wall composition according to the present invention will be described in detail with reference to the accompanying drawings.

The eco-friendly concrete retaining wall block composition according to the present invention can be manufactured by mixing the blast furnace slag aggregate, which is an industrial by-product generated in the steel making process, with the stone and the admixture at an optimum blending ratio, thereby improving the bending strength, compressive strength, pH, It is possible to maintain the strength of the retaining wall constructed on the slope side slope of the road, the embankment, the bottom wall of the complex, the landscape wall surface, and the slope of the slope, and the planting space can be designed to have a vegetation space on the retaining wall.

The eco-friendly concrete retaining wall block composition according to the first embodiment of the technical idea of the present invention includes a fiber reinforcing material used for blast furnace slag cement, aggregate, water and admixture.

The blast furnace slag cement is obtained by mixing Portland cement clinker and blast furnace slag mixed with pulverized or combined gypsum in the blast furnace slag produced at the steel mill, In 5210, blending amount of blast furnace slag is defined as 24% ~ 65% by weight.

In addition, the grades of blast furnace slag cement are classified into grade 1 and class 1, and the difference is differentiated by compressive strength. The chemical composition (KS L 5210) of the blast furnace slag cement is as shown in Table 1 (chemical composition of blast furnace slag cement (KS L 5210)) and the physical performance (KS L 5210) ] (Physical properties of blast furnace slag cement (KS L 5210)).

Chemical composition Express 1st grade Anhydrous sulfuric acid (SO ₃ )% 3.0 or less 4.5 or less Ignition Content% 3.0 or less 3.0 or less Sulfur (S)% 2.0 or less -

Item Express 1st grade Powder (cm ² / g) Specific surface area 2600 or more 2600 or more Average 2800 or more 2800 or more Stability (%) Autoclave expansion or shrinkage 0.20 or less 0.20 or less Setting time Gilmore freshness (minute) 60 or more 60 or more Closing (time) over 10 over 10 Vika first minute 45 or more 60 or more Closing (time) 7 or less below 10 Compressive strength (Kgf / cm ² ) 3 days 130 or more 100 or more 7 days 200 or more 160 or more 28th 250 or more 250 or more Heat of hydration (Cal / g) 7 days 70 or less 70 or less 28th Below 80 Below 80 Air content of mortar (%) 12 or less -

The blast furnace slag cement means a cement which is substituted by partially replacing cement with blast furnace slag, which is an industrial waste generated in a steelmaking process. The blast furnace slag cement has advantages of low hydration heat, water tightness and chemical durability of concrete , There is a disadvantage that the condensation delay of the concrete, that is, the initial strength is lowered, because the heat of hydration is low.

When the blast furnace slag cement is used in an amount of less than 250 parts by weight, the strength of the concrete retaining wall is weakened, and thus the concrete slag cement serves as concrete pouring material. If the amount is more than 300 parts by weight, too much blast furnace slag cement is contained in excess of the amount of aggregate, which may result in deterioration of concrete retaining wall block after curing and the difficulty of construction. Therefore, the blast furnace slag cement is preferably used in an amount of 250 to 300 parts by weight.

The aggregate is intended to improve the bending strength while maintaining the structural rigidity of the concrete retaining wall block required for stabilizing the vegetation of the revetment and slope, and includes the crushed stone aggregate, the blast furnace slag aggregate, and the abrasive stone in the present invention.

The fine aggregate fine aggregate is used to maintain the rigidity of the concrete retaining wall block. In the present invention, the fine aggregate fine aggregate may be included in 100 to 600 parts by weight. When the fine aggregate fine aggregate is contained in an amount less than 100 parts by weight, There is a problem that the strength of the retaining wall block is weakened. When the amount exceeds 600 parts by weight, there is a problem that the workability and the bending strength are deteriorated. Therefore, it is preferable that 100 to 600 parts by weight of the fine aggregate is used in the present invention.

The blast furnace slag aggregate is finely pulverized wastewater slag, which is a by-product of the pig iron manufacturing process. It enhances the long-term strength of the cement, increases the watertightness, water resistance and suppresses the alkali reaction and is added to control the pH of the concrete retaining wall block . In the present invention, the blast furnace slag aggregate can induce a reaction with calcium hydroxide generated during curing of blast furnace slag cement to form stable hydrate. The blast furnace slag aggregate has a maximum size of 8 mm and a particle size of 100 to 600 parts by weight . When the blast furnace slag aggregate is contained in an amount of less than 100 parts by weight, it is difficult to control the pH of the concrete retaining wall block by inhibiting the alkali reaction. When the blast furnace slag aggregate exceeds 600 parts by weight, the blast furnace slag cement amount becomes relatively insufficient, Lt; / RTI > Therefore, it is preferable that 100 to 600 parts by weight of the blast furnace slag aggregate is used in the present invention.

The abrasive strength of the concrete retaining wall block according to the present invention can be increased and the roughness and color of the retaining wall surface can be expressed naturally. In the present invention, 400 to 800 parts by weight of the above-mentioned abrasive powder may be included. If the abrasive grains are contained in an amount of less than 400 parts by weight, the bending strength of the retaining wall block is weakened. The permeability can be increased. Therefore, in the present invention, it is preferable that 400 to 800 parts by weight of the above-mentioned abrasive is used.

The water is used for blending the blast furnace slag cement, the aggregate, and the fiber reinforcing material to be described below, and it is preferable to use purified water without impurities and without impurities.

In the present invention, water may be contained in an amount of 50 to 100 parts by weight. When the amount of water is less than 50 parts by weight, the amount of water used for the blast furnace slag cement, aggregate and fiber reinforcement is too small, The amount of water used for blast furnace slag cement, aggregate and fiber reinforcing material is excessively increased, and the slagging phenomenon may occur. Therefore, the water is preferably used in an amount of 50 to 100 parts by weight in the present invention.

The fiber reinforcing material may be used to prevent brittle fracture of the concrete retaining wall block, and the fiber reinforcing material is dispersed shortly and arbitrarily in the concrete retaining wall block to control the growth of cracks occurring in the concrete retaining wall block to prevent fracture . For example, the fibrous reinforcement can stop or delay crack growth inside the blast furnace slag cement matrix, thereby improving the drawability and cracking resistance of the concrete block.

In the present invention, the natural fiber as shown in FIG. 1 can be used as the fiber reinforcing material. The properties of the natural fiber are shown in Table 3 (characteristics of natural fiber).

Elastic modulus (GPa) Density (g / mm ³ ) Fiber length (mm) Fiber diameter (mm) Tensile strength (MPa) Surface 61 1.26 3 0.015 510 Hydrophilic

In the present invention, the natural fiber is used as an admixture material and may be included in an amount of 0.5 to 5 parts by weight. When the natural fiber is contained in an amount of less than 0.5 part by weight, when cracks occur in the concrete retaining wall block, If it is contained in an amount exceeding 5 parts by weight, fiber aggregation may occur during compounding, resulting in separation of the material during the process of manufacturing the concrete retaining wall block, resulting in a decrease in strength of the concrete retaining wall block. . Accordingly, the natural fiber is preferably used in an amount of 0.5 to 5 parts by weight in the present invention.

In addition, the eco-friendly concrete retaining wall block composition according to the second embodiment of the technical idea of the present invention includes latex used as blast furnace slag cement, aggregate, water and admixture.

The eco-friendly concrete retaining wall block composition according to the second embodiment of the technical idea of the present invention includes blast furnace slag cement, aggregate and water having the same weight as that of the first embodiment, In the following description, only the configuration of the latex used as the admixture in the second embodiment will be described in detail.

The latex is a kind of polymer produced by chemical synthesis. It stabilizes the concrete retaining wall block composition according to the present invention to prevent condensation, as well as to increase fluidity in a water-cement mixture and form a film film during hydration reaction . Due to such characteristics, the permeability can be decreased, the adhesion strength can be increased, and the tensile strength can be improved by attaching to the surface of the hydrate and aggregate to fill the voids.

The latex may be selected from the group consisting of styrene butadiene rubber (SBR), ethylene vinyl acetate (EVA), poly-acrylic ester (PAE), polyvinyl acetate (PVA) Styrene polyvinyl chloride, natural rubber, polybutadiene, nitrate rubber, aldehyde type resin, acrylic copolymer, vinyl acetate ethylene Any one selected from the group consisting of vinyl acetate ethylene copolymer, vinylidene, vinyl chloride copolymer and epoxy resin latex or a mixture thereof may be used , Preferably styrene butadiene rubber (SBR) may be used.

In the present invention, the latex improves the workability of the uncured concrete block, increases the strength of the concrete retaining wall block, and stabilizes the pore structure of the concrete retaining wall block. In the present invention, the latex may be included in an amount of 2 to 10 parts by weight. When the latex is contained in an amount of less than 2 parts by weight, the lubricating effect of the latex is insufficient, and sufficient workability can not be obtained. If the amount is more than 10 parts by weight, the material is separated and the strength of the concrete retaining wall block can not be obtained, and the durability characteristics may be deteriorated. Therefore, in the present invention, the latex is preferably used in an amount of 2 to 10 parts by weight.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an environmentally friendly concrete retaining wall according to the technical idea of the present invention will be described in detail with reference to the accompanying drawings.

1. Example: Construction and Curing of Concrete Retaining Wall Block Specimen

A circumferential specimen with a diameter of 100 mm and a height of 200 mm was prepared to grasp the physical and mechanical properties such as porosity, compressive strength and pH of the eco-concrete retaining wall block according to the present invention.

First, the columnar specimen was prepared by mixing the materials constituted of the concrete retaining wall block composition as in the first or second embodiment, mixed using a forced fan mixer as shown in FIGS. 2 and 3, As shown in Fig. 4, a specimen was produced in a columnar shape.

Next, as shown in Fig. 5, initial curing was performed to fabricate a columnar specimen having a diameter of 100 mm and a height of 200 mm.

An eco-concrete retaining wall block specimen was prepared by varying the blending ratio of natural fiber or latex used as water, blast furnace slag cement, aggregate, and admixture, as shown in Table 4 below (mixing ratio of concrete retaining wall blocks).

Example Unit quantity (kg / m ³ ) water
Blast furnace slag cement aggregate fiber
Latex
broken stone
Fine aggregate Blast furnace slag aggregate
(8 mm) Stone
(Stone powder) One 80 310 600   - 600 - - 2 80 310 500 100 600 - - 3 80 310 400 200 600 - - 4 80 310 300 300 600 - - 5 80 310 200 400 600 - - 6 80 310 100 500 600 - - 7 80 310 0 600 600 - - 8 80 310 600 - 600 1.2 - 9 80 310 500 100 600 1.2 - 10 80 310 400 200 600 1.2 - 11 80 310 300 300 600 1.2 - 12 80 310 200 400 600 1.2 - 13 80 310 100 500 600 1.2 - 14 80 310 0 600 600 1.2 15 76 310  600 - 600 - 6.2 16 76 310 500 100 600 - 6.2 17 76 310 400 200 600 - 6.2 18 76 310 300 300 600 - 6.2 19 76 310 200 400 600 - 6.2 20 76 310 100 500 600 - 6.2 21 76 310 0 600 600 - 6.2

2. Measurement of bending strength

In order to evaluate the bending strength characteristics of the eco-friendly concrete retaining wall block according to the present invention, the bending strength test according to KSF 2408 was performed in this embodiment. The bending strength specimen was made of 100 mm x 100 mm x 400 mm square specimen. FIGS. 6 and 7 are photographs showing a state in which a prismatic specimen is manufactured to measure the bending strength according to the present embodiment. In the present embodiment, the prismatic specimen was demolded after initial curing at 23 ± 2 ° C. and relative humidity of about 58% for 24 hours after fabrication. As shown in FIG. 8, in the curing chamber at 23 ± 2 ° C., And then measured.

3. Compression strength measurement

In order to evaluate the mechanical characteristics of the environmentally friendly concrete retaining wall block according to the embodiment of the present invention, the compressive strength test according to KSF 2405 was performed in this embodiment.

The specimens were fabricated with a diameter of 100 mm and a height of 200 mm. After the initial curing at 23 ± 2 ° C and the relative humidity of 58% for 24 hours, the specimens were demolded and cured in water at 23 ± 2 ° C for 28 days. Respectively. At this time, the upper part of the specimen was capped with cement paste to solve the influence on the eccentricity generated at the compressive strength.

The capped block specimen to measure the compressive strength is shown in FIG. 9, and the compressive strength test of the concrete retaining wall block specimen according to the present invention is shown in FIG.

4. pH test

In the embodiment of the present invention, the method of KSM 0011 is applied to measure the pH of the environmentally-friendly concrete retaining wall block. In the test method, a columnar specimen with a diameter of 100 mm and a height of 200 mm was prepared and cured during the appropriate age. Then, 60 ml of distilled water was dispersed in the upper part of the column to measure the pH of the middle stream. Curing was performed after initial curing at 23 ± 2 ° C and relative humidity of about 58% for 24 hours after making a columnar specimen with a diameter of 100 mm and a height of 200 mm.

The photograph of the pH meter applied in the embodiment according to the present invention is as shown in FIG. 11, and the photograph of dispersing distilled water in the environmentally-friendly concrete retaining wall block is as shown in FIG. 12, and the pH is measured as shown in FIG.

5. Bending strength test result

The effect of incorporating the fiber reinforcement in the concrete retaining wall block according to the present invention affects the flexural strength, i.e., the tensile strength increase, rather than the compressive strength. In the case of the concrete retaining wall block including the fiber reinforcing material, the generation of cracks is suppressed when a flexural load is applied, while a plurality of cracks having a width smaller than a wide crack are induced to prevent sudden fracture and induce ductile fracture Have.

The fiber reinforcing material has an effect of increasing the toughness of the concrete retaining wall block, that is, the energy absorbing ability. Therefore, it can be mixed with the eco-friendly concrete retaining wall block according to the present invention to increase the flexural strength.

The latex can increase the bending tensile strength of the concrete by improving the adhesion between the materials due to the adhesive force of the material itself.

The results of the flexural strength test according to whether or not the blast furnace slag aggregate, the natural fiber, and the latex are added to the eco-friendly concrete retaining wall block in this embodiment are shown in Table 5 and Fig.

Referring to Table 5 below (Bending strength test results of the environmentally-friendly concrete retaining wall block) and FIG. 14, in the example according to the present invention, the blast furnace slag cement is 250-300 parts by weight, the crushed stone fine aggregate is 100-600 parts by weight, When the slag aggregate was 100 to 600 parts by weight and the stone powder was contained in the range of 400 to 800 parts by weight, the flexural strength of the concrete retaining wall block to which natural fiber was added exhibited an average value of 3 to 5 MPa, and the concrete retaining wall block It can be seen that the flexural strength shows an average value between 4 and 9 MPa.

Therefore, it is considered that natural fiber or latex should be added to satisfy the bending strength required in the eco-friendly concrete retaining wall block according to the present invention.

Example Number of specimens Average value (MPa) One 2 One 3.75 3.93 3.84 2 4.95 4.89 4.92 3 5.04 4.68 4.86 4 5.73 3.93 4.83 5 4.20 3.99 4.10 6 4.05 4.02 4.04 7 4.14 3.69 3.92 8 3.09 3.63 3.36 9 4.68 4.68 4.68 10 4.53 4.44 4.49 11 5.31 3.60 4.46 12 4.68 3.78 4.23 13 3.90 3.48 3.69 14 3.75 3.57 3.66 15 4.92 4.32 4.62 16 8.28 8.07 8.18 17 7.74 8.55 8.15 18 8.52 7.68 8.10 19 7.59 7.95 7.77 20 6.51 8.19 7.35 21 7.56 6.72 7.14

6. Compression strength test result

In the eco-friendly concrete retaining wall block according to the present invention, the compressive strength shows the stiffness of the block, and if the porosity is relatively large, the compressive strength is significantly lowered.

The results of the compressive strength test according to whether or not the blast furnace slag aggregate, the natural fiber and the latex are added to the eco-friendly concrete retaining wall block in this embodiment are as shown in the following Table 6 and Fig.

Fiber reinforcement can increase the amount of binder at the interface between aggregate and aggregate, which is the main part of the failure of eco-concrete retaining wall block, and it is possible to increase strength by interfacial reinforcement. It is possible to expect the effect of increasing the strength by suppressing the occurrence and growth of cracks.

Latex can improve the resistance to block failure by increasing the adhesion of latex itself, and due to the nature of the dry production method, the water-cement ratio is so small that fluidity can not be ensured, resulting in poor compaction, The effect of reducing the strength due to the degradation can be suppressed.

15 and FIG. 15, the blast furnace slag cement is 250-300 parts by weight, the crushed stone fine aggregate is 100-600 parts by weight, When the blast furnace slag aggregate was 100 to 600 parts by weight and the stone powder was contained in the range of 400 to 800 parts by weight, the compressive strength of the concrete retaining wall block to which natural fiber was added showed an average value of 23 to 38 MPa, It can be seen that the compressive strength of the block represents an average value between 30 and 38 MPa.

Therefore, natural fiber or latex should be added to satisfy the compressive strength required in the eco-friendly concrete retaining wall block according to the present invention.

Example Specification Number Average (MPa) One 2 3 4 One 22.46 18.39 18.52 26.45 21.46 2 39.94 45.15 37.76 - 40.95 3 43.89 45.53 27.41 - 38.94 4 32.94 33.81 28.15 18.09 28.25 5 33.07 30.82 16.36 25.83 26.52 6 28.05 18.45 31.24 25.61 25.83 7 15.32 22.06 26.36 35.43 24.79 8 36.71 31.44 41.49 42.14 37.95 9 29.86 40.74 32.45 34.71 34.44 10 28.32 41.41 23.35 21.55 28.66 11 28.92 18.64 25.81 35.54 27.23 12 23.64 14.99 23.32 34.87 24.21 13 13.36 19.67 27.72 32.84 23.40 14 15.75 12.20 14.79 8.98 12.93 15 33.80 31.40 25.49 23.35 30.23 16 37.73 37.95 37.89 35.03 37.86 17 28.59 37.58 41.86 14.37 36.01 18 38.33 30.75 37.71 31.35 35.60 19 26.09 37.92 36.03 37.96 33.35 20 35.64 31.99 33.82 34.65 33.82 21 33.34 31.72 29.68 35.44 31.58

7. pH test results

In the eco-friendly concrete retaining wall block according to the present invention, the pH indicates the growth environment of the plant. The calcium oxide (CaO) contained in the cement used as a binder of the concrete retaining wall block is permeated through the porous concrete retaining wall, Alkaline calcium hydroxide (Ca (OH) ₂ ) is produced in a large amount during the reaction, and the strong alkaline water thereby adversely affects the growth of the plant, and consequently the plant vegetation is inhibited. Therefore, an appropriate range of pH in the environmentally-friendly concrete retaining wall block according to the present invention can be an important parameter of plant growth. Especially, when the pH is around 12 ~ 13, concrete can be difficult to apply to concrete retaining wall block due to strong alkalinity.

The results of the pH test according to whether or not the blast furnace slag aggregate, the natural fiber, and the latex are added to the eco-friendly concrete retaining wall block in this embodiment are shown in Table 7 and FIG.

Referring to the following Table 7 (pH test result of the environmentally-friendly concrete retaining wall block) and FIG. 16, it is shown that in the embodiment of the present invention, the blast furnace slag cement is 250-300 parts by weight, the crushed stone fine aggregate is 100-600 parts by weight, When the slag aggregate is 100 to 600 parts by weight and the stone powder is 400 to 800 parts by weight, the pH of the concrete retaining wall block to which natural fiber or latex is added is an average value of 9 to 11.

It can be seen that the pH value of the environmentally friendly concrete retaining wall block according to the present invention satisfies the pH condition suitable for plant growth.

Example Specification Number medium
One 2 3 One 10.18 10.09 10.42 10.23 2 9.92 10.08 9.98 9.99 3 9.55 9.89 10.11 9.85 4 9.95 9.93 9.93 9.94 5 9.86 10.70 10.22 10.26 6 9.95 9.66 10.05 9.89 7 9.82 9.89 9.68 9.80 8 10.17 10.00 10.08 10.08 9 9.84 9.75 9.96 9.85 10 9.91 9.73 9.74 9.79 11 9.73 9.57 10.00 9.77 12 9.56 9.76 9.86 9.73 13 10.14 10.13 9.85 10.04 14 9.93 10.63 10.25 10.27 15 9.99 10.08 10.07 10.05 16 10.09 10.12 10.18 10.13 17 10.14 10.35 10.23 10.24 18 10.16 10.16 10.16 10.16 19 10.14 10.13 10.13 10.13 20 10.15 10.16 10.13 10.15 21 10.14 10.15 10.14 10.14

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that one embodiment described above is illustrative in all aspects and not restrictive.

Claims (8)

Blast furnace slag cement, crushed stone fine aggregate, blast furnace slag aggregate, limestone, water and admixture,
Wherein the blast furnace slag cement comprises 250-300 parts by weight, the crushed stone fine aggregate is 100-600 parts by weight, the blast furnace slag aggregate is 100-600 parts by weight, the limestone is 400-800 parts by weight, the water is 50-100 parts by weight, Wherein the fiber reinforcing material is contained in an amount of 0.5 to 5 parts by weight.
The method according to claim 1,
Characterized in that the blast furnace slag aggregate has a maximum particle diameter of 8 mm and the granite is used in the form of powder in the form of a powder or in the form of a circulating fine aggregate which is generated during the crushing of waste concrete and natural fiber is used as the fiber reinforcing material Concrete retaining wall block composition.
Blast furnace slag cement, crushed stone fine aggregate, blast furnace slag aggregate, water and latex used as admixture,
Wherein the blast furnace slag cement comprises 250-300 parts by weight, the crushed stone fine aggregate is 100-600 parts by weight, the blast furnace slag aggregate is 100-600 parts by weight, the limestone is 400-800 parts by weight, the water is 50-100 parts by weight, Wherein the latex comprises 2 to 10 parts by weight of the latex.
The method of claim 3,
The latex may be selected from the group consisting of styrene butadiene rubber (SBR), ethylene vinyl acetate (EVA), poly-acrylic ester (PAE), polyvinyl acetate (PVA) Styrene polyvinyl chloride, natural rubber, polybutadiene, nitrate rubber, aldehyde type resin, acrylic copolymer, vinyl acetate ethylene It is possible to use any one selected from the group consisting of vinyl acetate ethylene copolymer, vinylidene, vinyl chloride copolymer and epoxy resin latex or a mixture thereof Characterized in that the composition of the green concrete retaining wall block
100 to 600 parts by weight of blast furnace slag aggregate, 100 to 600 parts by weight of blast furnace slag aggregate, 400 to 800 parts by weight of stone powder, 50 to 100 parts by weight of water and 0.5 to 5 parts by weight of natural habit fibers are blended And an eco-friendly concrete retaining wall block prepared by mixing and mixing with a forced fan mixer,
Wherein the eco-friendly concrete retaining wall block has a flexural strength in the range of 3 to 5 MPa, a compressive strength in the range of 23 to 38 MPa, and a pH in the range of 9 to 11.
6. The method of claim 5,
The bending strength was 100 mm × 100 mm × 400 mm. After the initial curing at 23 ± 2 ° C and the relative humidity of 58% for 24 hours, the specimens were demolded and cured in water at 23 ± 2 ° C for 28 days. After measurement,
The specimens having a diameter of 100 mm and a height of 200 mm were subjected to initial curing at 23 ± 2 ° C. and relative humidity of 58% for 24 hours, followed by demolding and curing in water at 23 ± 2 ° C. for 28 days. After measurement,
Wherein said pH is measured after initial curing at 23 +/- 2 DEG C and 58% relative humidity for 24 hours.
100 to 600 parts by weight of blast furnace slag aggregate, 100 to 600 parts by weight of blast furnace slag aggregate, 400 to 800 parts by weight of stone powder, 50 to 100 parts by weight of water and 2 to 10 parts by weight of latex are blended, And an eco-friendly concrete retaining wall block prepared by mixing and mixing with a forced fan mixer,
Wherein the eco-friendly concrete retaining wall block has a flexural strength in the range of 4 to 9 MPa, a compressive strength in the range of 30 to 38 MPa, and a pH in the range of 10 to 11.
8. The method of claim 7,
The bending strength was 100 mm × 100 mm × 400 mm. After the initial curing at 23 ± 2 ° C and the relative humidity of 58% for 24 hours, the specimens were demolded and cured in water at 23 ± 2 ° C for 28 days. After measurement,
The specimens having a diameter of 100 mm and a height of 200 mm were subjected to initial curing at 23 ± 2 ° C. and relative humidity of 58% for 24 hours, followed by demolding and curing in water at 23 ± 2 ° C. for 28 days. After measurement,
Wherein said pH is measured after initial curing at 23 +/- 2 DEG C and 58% relative humidity for 24 hours.

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