KR101116129B1 - The composition and manufacturing method of water permeable concrete - Google Patents

Abstract

The present invention is 20 ~ 40kg Portland cement 2 ~ 15kg α- hemihydrate gypsum, 2 ~ 10 kg of CSA (Calcium sulfo aluminate) and 0.5 ~ 5kg of quicklime (CaO) Tartaric acide tartaric acide (C ₄ H ₆ O ₆ ) 0.05 ~ 0.5 kg to 1.0 kg of cement with 1.0 kg high performance water reducing agent, 0.1 to 0.5 kg of stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ), 1 to 3 kg of natural palm fiber of 10 to 20 mm 3 ~ 20kg of island (2,000 ~ 5,000cm ² / g), new concept of mixed aggregates crushed ocher brick and 80 ~ 85kg of soybean (5mm ~ 10mm) generated as a by-product after sand selection in the mortar production plant As a mortar composition for water-permeable concrete, it relates to a multifunctional water-permeable concrete composition having a function of ultrafast mirror, high strength, non-shrinkage, environment-friendly, high durability, and a manufacturing method thereof.

Description

 Water-permeable concrete composition and method for manufacturing the same {The composition and manufacturing method of water permeable concrete}

The present invention relates to a water-permeable concrete composition such as roads and rivers, such as roads and rivers that require permeability, such as bicycle paths, trails in ecological parks, trails, experience village roads, and parking lots.

In the case of conventional pitched concrete, inorganic pigments are added to ordinary portland cement, natural aggregates, crushed aggregates, circulating aggregates, and coloring materials in a nearby ready-mixed concrete batcher. In order to prevent water evaporation during the transport process, separate curing guns and blocking devices are installed in the dump truck, and when the construction conditions are delayed, water is sprayed on the site by the dryness of the product. There is a limitation of the work because it can be worked only within 90 minutes from the ready-mixed concrete batcher to the site construction.

In addition, conventional permeable concrete may cause problems due to dry shrinkage cracking caused by dry shrinkage of cement and whitening phenomena caused by soluble salts other than cement and aggregates, and cracks and surfaces due to expansion pressure due to freezing thawing. The peeling phenomenon is also occurring, and because of the characteristics of cement, the compressive strength is excellent, but there is a weak part in the flexural strength.

In the conventional case, the working time (transportation distance) of the wet production method is limited to within 90 minutes, and it is produced in a dry method that mortars to solve the limitation of the work site, so that only water can be poured in the field so that workability and ease of construction are possible. The problem of depletion of natural aggregate is recycled soybean gravel (5mm ~ 10mm) generated as a by-product after sand selection in ocher brick and mortar production plant in ocher brick process, and the dry shrinkage of cement after construction It prevents cracking, surface peeling and whitening, and has super speed mirror, high strength, far infrared rays and deodorizing function to enable durability and emergency construction. It improves bending strength by using natural palm fiber and finely grinds pine stone to use as natural pigment. Let's develop a permeable concrete composition.

In order to solve the problems described above, the present invention provides 80 to 85 kg of soybean gravel generated from recycled ocher bricks and mortar production plants, and 2 to 15 kg of α-half gypsum as a super hard and high strength material in 20 to 40 kg of Portland cement. , 2 ~ 10 kg of CSA (Calcium sulfo aluminate) and 0.5 ~ 5kg of quicklime (CaO) as cement dry shrinkage inhibitor, Tartaric acide (C ₄ H ₆ O ₆ ) 0.5 kg to 1.0 kg of 1.0 kg high-performance water reducing agent, 0.1 to 0.5 kg of stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) to prevent bleaching, and 10 to 20 mm natural to improve the bending strength of permeable concrete This is a new concept functional mortar composition for water permeable concrete mixed with 1 ~ 3kg of palm fiber, 3 ~ 20kg of finely ground powder (2,000 ~ 5,000cm ² / g) to give the function of far infrared rays and deodorizing effect. Light, ultra high strength, no shrinkage, eco-friendly, high durability Relates to a multifunctional water-permeable concrete composition and a method of manufacturing the same.

The present invention is advantageous in terms of workability and workability because there is no limitation of working time and transport time by pouring only water in the field compared to conventional water-permeable concrete products, and there can be no crack generation caused by dry shrinkage, so that the crack inducing joint process can be omitted. . In addition, it prevents cement whitening, has excellent freeze-thawing resistance, has excellent water permeability of about 2 ~ 4 times, and improves compressive strength of about 8 ~ 10 times at initial strength (1 day of age). The flexural strength has been improved by 2.3 ~ 3.3 times by using, and the price is cheaper than that of artificial fibers, which is advantageous for economic and eco-friendliness.

In addition, the condensation time is about 2 ~ 20 times faster than the existing products, so it is suitable for the air shortening effect and urgent construction, and it is possible to manufacture permeable concrete with eco-friendly and functional properties of α-half gypsum and pine stone, Recycling is an environmentally friendly advantage.

In order to solve the problems described above, the present invention relates to a composition of dry mortar for permeable concrete, and has a port speed of 20 to 40 kg, a high speed, high strength, expansion control material, α-15 hemihydrate gypsum, 2-15 kg, CSA (Calcium sulfo). Aluminate) 2-10 kg and 0.5-5 kg of quicklime (CaO). Tartaric acide (C ₄ H ₆ O ₆ )

As a 0.05 to 1.0 kg retardant, any one compound selected from tartaric acid (C ₄ H ₆ O ₆ ), citric acid (C ₆ H ₈ O ₇ ), or two or more compounds may be used.

0.5 ~ 1.0kg of cement for powdered naphthalene-based high performance water reducing agent, 0.1 ~ 0.5kg for stearic acid salt (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ),

As the water reducing agent, any one compound selected from naphthalene compounds, ligline compounds, and polycarboxylic acid compounds may be used, or two or more compounds may be used.

In order to improve the bending strength of the permeable concrete, 1 ~ 3kg of palm fiber of 10 ~ 20㎜ size is added.

As natural fibers, any one compound selected from sugarcane fibers and jute fibers, or two or more compounds may be used.

To give the function of far-infrared and deodorant effect, 3 ~ 20kg of powder diagram (2,000 ~ 5,000cm ² / g) and reclaimed ocher bricks are pulverized by ball milling multi-magnetic (far-infrared, anion, etc.) pine stone A new concept of functional mortar for permeable concrete mixed with 80 ~ 85kg of soybean gravel generated by sand after sorting sand at an aggregate and remittal plant in a high density mixer (drum type). It relates to a multifunctional water-permeable concrete composition having a function of eco-friendly, high durability, and a method of manufacturing the same.

Describe the mechanism of action of each composition used in the present invention,

Stearic acid-based compounds do not chemically react, but are physically filled and hydrophilic, so that the hydrophilic groups are oriented in the capillary pores to cement and aggregates, and the hydrophobic groups are oriented in the capillary pores to prevent water migration from the capillary pores, thereby making the whitening component concrete and The whitening is reduced by preventing migration to the surface of the mortar. The anti-whitening agent may be any one compound selected from stearic acid compounds and silane compounds, or two or more compounds may be used.

α-Half Gypsum, CSA, CaO

A crude steel binder (CSA, α-half gypsum) was used to secure fast hardening and shrinkage.

Looking at the hydration reaction of the crude steel binder,

① 3CaO.3Al2O3.CaSO4 + 18H2O

                         → 3CaO.Al2O3.3CaSO4.12H2O + 2Al (OH) 3

② 3CaO.3Al2O3.CaSO4 + 2CaSO4 + 32H2O

                         → 3 CaO.Al 2 O 3.3 Ca aSO4.32 H 2 O + 2 Al (OH) 3

③ 3CaO.3Al2O3.CaSO4 + 6Ca (OH) 2 + 2CaSO4 + 26H2O

                         → 3 (3CaO.Al2O3.3CaSO4.12H2O)

④ 3CaO.3Al2O3.CaSO4 + 6Ca (OH) 2 + 8CaSO4 + 74H2O

                        → 3 (3CaO.Al2O3.3CaSO4.32H2O)

The steel binder: supplying an α- half of the plaster (CSA 3CaO.3Al2O3.CaSO4) to generate the expansion material of Ettringite was secured non-shrinkable grant in hard to promote C3A active to react with the OPC internal C ₃ A Yes.

α half gypsum _{(α? CaSO 4? 1 /} 2H 2 O) is high yisuseok As shown in Fig. _{1] (CaSO 4? 2H 2} O) from the normal pressure solution method, a pressure hydrothermal method, a microwave method and a hydrothermal reaction method It is manufactured by drying by wet pressure dehydration by, for example.

The α hemihydrate gypsum produced from such a process has the same mechanical strength as that of cement and has a fast hardness, and is mainly used for medical and industrial shapes.

The crack-binding effect and the mechanical behavior of natural palm fibers are shown by dispersing the fibers in a brittle matrix. Its mechanical properties are improved mechanically for tensile, flexural and impact strength, and it is cheaper than artificial fiber and shows excellent performance.

In addition, far-infrared radiation aggregate was used to help activate the metabolic function of the human body using α-half gypsum and Song-seok.

By crushing Songseok Stone to use it as a natural pigment, eco-friendliness and economics were secured.

[Table 1] Physical and chemical properties by materials used

Name of material Chemical composition Physical properties SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO SO3 K2O ig.loss Powder
(cm ² / g) Heavy weight cement 21.21 5.17 3.34 62.72 2.41 2.34 1.20 3250 3.15 CSA 10.94 35.96 2.16 41.75 0.20 8.55 0.28 0.46 4230 2.83 Ocher aggregate 51.96 26.46 5.36 1.80 1.13 0.05 9.51 - - quicklime 2.96 1.13 1.88 74.96 3.27 - 14.77 Songseok Stone Powder 40.42 18.10 10.87 2.75 1.78 2.94 0.93 1.37 4628 1.18

Name of material Chemical composition Physical properties complete
gypsum Half
gypsum CaCO3 SO3 MgO Powder
(cm ² / g) Heavy weight α-Half Gypsum 4.43 90.08 1.27 1.32 2.41 1658 2.6

Hereinafter, the present invention will be described in detail through examples.

Example 1

First Process (Manufacturing Recycled Aggregate)

Ocher brick 1000 kg as a by-product from ocher brick factory

Using a crusher to sort and crush the aggregate size 5 ~ 10mm,

In order to use as fine aggregate of mortar in Remithal factory, it is dried and screened and manufactured by mixing soybean gravel size 5 ~ 10mm generated by by-product with ocher aggregate in 50:50 ratio.

2nd process (Song-seok powder manufacture)

100 kg of pine nuts,

After mixing 0.1 kg of diesel glycol (DEG Diethylene glycol) as a grinding aid to prepare a fine powder to 2,000 ~ 5,000cm ² / g

3rd process (manufacturing dry mortar for multifunctional permeable concrete)

Ordinary port cement 13kg,

α-half gypsum 1.3 kg,

 1.3 kg of alumina sulfo mineral CSA (Calcium sulfo aluminate),

 0.5 kg of quicklime,

Tartaric acide (C ₄ H ₆ O ₆ ) 0.05 kg,

Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.065 kg,

 2kg natural coconut fiber,

 Naphthalene powder type high performance reducer 0.5kg,

 3 kg of the composition prepared in the second step and

 78.29 kg of the composition prepared in the first step

 A water-permeable concrete composition was prepared by mixing in a high density drum mixer.

Example 2

First Process (Manufacturing Recycled Aggregate)

Ocher brick 1000 kg as a by-product from ocher brick factory

Using a crusher to sort and crush the aggregate size 5 ~ 10mm,

In order to use as fine aggregate of mortar in Remithal factory, it is dried and screened and manufactured by mixing soybean gravel size 5 ~ 10mm generated by by-product with ocher aggregate in 50:50 ratio.

2nd process (Song-seok powder manufacture)

100 kg of pine nuts,

After mixing 0.1 kg of dimethyl glycol (DEG Diethylene glycol) as a grinding aid to prepare a fine powder to 2,000 ~ 5,000cm ² / g,

3rd process (manufacturing dry mortar for multifunctional permeable concrete)

Ordinary port cement 13kg,

α-half gypsum 1.3 kg,

 1.3 kg of alumina sulfo mineral CSA (Calcium sulfo aluminate),

 0.5 kg of quicklime,

Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.065 kg,

 2kg natural coconut fiber,

 Naphthalene powder type high performance reducer 0.5kg,

Tartaric acide (C ₄ H ₆ O ₆ ) 0.05 kg,

 3 kg of the composition prepared in the second step and

 78.29 kg of the composition prepared in the first step

 A water-permeable concrete composition was prepared by mixing in a high density drum mixer.

Example 3

First Process (Manufacturing Recycled Aggregate)

 Ocher brick 1000 kg as a by-product from ocher brick factory

Using a crusher to sort and crush the aggregate size 5 ~ 10mm,

 In order to use as a fine aggregate of mortar in the remithal factory, after drying and screening, after mixing soybean gravel size 5 ~ 10mm generated as a by-product in the ratio of 50:50 with ocher aggregate,

2nd process (Song-seok powder manufacture)

100 kg of pine nuts,

After mixing 0.1 kg of dimethyl glycol (DEG Diethylene glycol) as a grinding aid to prepare a fine powder to 2,000 ~ 5,000cm ² / g,

3rd process (manufacturing dry mortar for multifunctional permeable concrete)

 Ordinary port cement 12kg,

 α-half gypsum 1.2 kg,

 1.2kg of alumina sulfo mineral CSA (Calcium sulfo aluminate),

 0.5 kg of quicklime,

Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.060 kg,

 2kg natural coconut fiber,

 Naphthalene powder type high performance reducer 0.5kg,

Tartaric acide (C ₄ H ₆ O ₆ ) 0.10 kg,

 3 kg of the composition prepared in the second step and

 79.44 kg of the composition prepared in the first step

 A water-permeable concrete composition was prepared by mixing in a high density drum mixer.

Example 4

First Process (Manufacturing Recycled Aggregate)

Ocher brick 1000 kg as a by-product from ocher brick factory

Using a crusher to sort and crush the aggregate size 5 ~ 10mm,

In order to use as a fine aggregate of mortar in the remithal factory, after drying and screening, after mixing soybean gravel size 5 ~ 10mm generated as a by-product in the ratio of 50:50 with ocher aggregate,

2nd process (Song-seok powder manufacture)

100 kg of pine nuts,

After mixing 0.1 kg of dimethyl glycol (DEG Diethylene glycol) as a grinding aid to prepare a fine powder to 2,000 ~ 5,000cm ² / g,

3rd process (manufacturing dry mortar for multifunctional permeable concrete)

 Ordinary port cement 11kg,

 α-half gypsum 1.1 kg,

 1.1 kg of alumina sulfo mineral CSA (Calcium sulfo aluminate),

 0.5 kg of quicklime,

Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.055 kg,

 2kg natural coconut fiber,

 Naphthalene powder type high performance reducer 0.5kg,

0.20 kg Tartaric acide (C ₄ H ₆ O ₆ ),

 3 kg of the composition prepared in the second step and

 80.55 kg of the composition prepared in the first step

 A water-permeable concrete composition was prepared by mixing in a high density drum mixer.

Example 5

First Process (Manufacturing Recycled Aggregate)

Ocher brick 1000 kg as a by-product from ocher brick factory

Using a crusher to sort and crush the aggregate size 5 ~ 10mm,

In order to use as a fine aggregate of mortar in the remithal factory, after drying and screening, after mixing soybean gravel size 5 ~ 10mm generated as a by-product in the ratio of 50:50 with ocher aggregate,

2nd process (Song-seok powder manufacture)

100 kg of pine nuts,

After mixing 0.1 kg of dimethyl glycol (DEG Diethylene glycol) as a grinding aid to prepare a fine powder to 2,000 ~ 5,000cm ² / g,

3rd process (manufacturing dry mortar for multifunctional permeable concrete)

Ordinary port cement 10kg,

α-half gypsum 1.0 kg,

1.0 kg of alumina sulfo mineral CSA (Calcium sulfo aluminate),

 0.5 kg of quicklime,

Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.05 kg,

 2kg natural coconut fiber,

 Naphthalene powder type high performance reducer 0.5kg,

Tartaric acide (C ₄ H ₆ O ₆ ) 0.30 kg,

 3 kg of the composition prepared in the second step and

 81.65 kg of the composition prepared in the first step

 A water-permeable concrete composition was prepared by mixing in a high density drum mixer.

Example 6

100 kg of the composition prepared in Examples 1-4

17 kg of water was constructed after 90 seconds of mixing in a forced concrete mixer.

Comparative Example 1

Ordinary port cement 17kg, 10mm steel aggregate 80kg, mineral pigment 3kg and

 17 kg of water was constructed after 90 seconds of mixing in a forced concrete mixer.

Experimental Example

Permeability performance, compressive strength, length change, freeze thawing, and anti-whitening ability were compared with those of conventional products in comparison with the mortar composition for multifunctional permeable concrete and conventional permeable concrete.

Permeability test was carried out in accordance with KS F 2322, and peeling and cracking due to whitening and freeze-thawing by salt appeared in the long term, so the freeze-thawing acceleration test was carried out according to KS F 2456 standard, and the occurrence of bleaching was 10% -NaCl. ₂ Test was conducted by immersing in aqueous solution to promote the occurrence of whitening

In addition, the crack estimation test caused by dry shrinkage of cement was measured for 70 days using a 0.1 * 0.1 * 1m length change specimen.

Compressive strength test was conducted in accordance with KS F 2405 and compared with existing products.

The condensation test was conducted according to KS L5108.

Test Items

The test items were permeability test, length change, compressive strength, flexural strength, freeze-thawing, bleaching test, and condensation test compared to current permeable cement concrete products.

Test result

1. Permeability

  Permeability test results of mortar for permeable concrete are as follows.

Fig. 2 Permeability Test Results

division cement α half
gypsum CSA CaO Stearate Wild field
Magnetic fiber Steel aggregate Bean pebbles ocher
brick Songseok Stone Powder Pigment Retardant High performance
Water reducing agent
Permeability
(%) Comparative Test Example 1 20 - - - - - 77 - 3 - - 100
practice
Example 1 13 1.3 1.3 0.5 0.065 2 - 39.15 39.15 3 - 0.05 0.5 108 practice
Example 2 12 1.2 1.2 0.5 0.060 2 - 39.72 39.72 3 - 0.10 0.5 115 practice
Example 3 11 1.1 1.1 0.5 0.055 2 - 40.28 40.28 3 - 0.20 0.5 120 practice
Example 4 10 1.0 1.0 0.5 0.050 2 - 40.83 40.83 3 - 0.30 0.5 150

In the permeability test results, Comparative Example 1 and Examples 1 to 4 showed excellent permeability compared to the current product,

2. Length change safety

The length change specimen was measured by shrinkage expansion change up to 70 days by measuring data value in the 1hr unit from the beginning of casting by using a mold manufactured to 0.1 × 0.1 × 1m size and dial gauge that can measure up to 0.00mm range.

[Figure 3] Permeable Concrete Length Change Rate

division Length change rate (%) 1hr 2hr 3hr 1 day 3 days 7 days 14 days 21st 28 days 40 days 50 days 70 days Comparative Example 1 0.00 0.00 0.00 -0.03 -0.02 -0.01 -0.02 -0.03 -0.04 -0.05 -0.06 -0.06
Example 1 0.00 -0.009 -0.012 -0.012 -0.012 -0.012 -0.012 -0.012 -0.012 -0.012 -0.012 -0.012

As shown in Table 3, in case of Comparative Example 1, dry shrinkage was started from 1 day of age, and at 70 days of age, the shrinkage was -0.06. , 3hr elapsed to -0.012 and stable until 70 days of age without volume change.

In order to secure fast hardness, high strength and non-shrinkability, the non-shrinkability using expansion was secured through the reaction of a crude steel binder (α-semi-hydrated gypsum, CSA, CaO).

In the case of CSA, quicklime and α-mimetic gypsum, it is generally known as a material that gives shrinkage compensation, high strength, and superfast diameter.

In the case of CSA, the hydration product produced ettringite, and the test result showed the most stable volume change when incorporating 5 ~ 15% of the cement. In the case of CaO, the hydration product was Calcium Hydroxide (Ca (OH) ₂ ). Due to the swelling effect.

When 3% or more, the condensation time is accelerated due to the exothermic reaction, which indicates that there is a problem in securing working time.

Also in the case of α-half gypsum, it acts as a high strength, super-speed mirror and expander

As a result of several tests, it showed stable values in strength and volume change when 10% mixed with cement.

3. Compressive strength and flexural strength

Compressive strength test of permeable concrete was made by Φ10 × 20 mold, and flexural strength was used by 4 × 4 × 16㎝ specimens, and the specimens were separated on a day of age and placed in a 21 ± 2 ℃ water bath for curing. Intensity was measured.

[Table 4] Test result of permeable concrete compressive strength and flexural strength

division Compressive strength (MPa) Flexural strength (MPa) 1 day 3 days 7 days 28 days 28 days Comparative Example 1 1.5 4.2 15.2 22.9 0.38 Example 1 15.6 19.8 34.5 46.5 1.26 Example 2 13.8 17.6 28.2 38.0 0.97 Example 3 13.2 16.2 27.1 36.7 0.89 Example 4 11.4 12.6 25.7 31.5 0.86

   4. Condensation test

 Condensation test measurement result

[Table 5] Condensation test measurement results with tartaric acide (C ₄ H ₆ O ₆ ) added

division cement α half
gypsum CSA CaO Stearate Wild field
Magnetic fiber Steel aggregate Bean pebbles ocher
brick Songseok Stone Powder
Pigment Retardant High performance
Water reducing agent Setting time First closing Comparative Test Example 1 20 - - - - - 77 - - 3 - - 6:20 11:26 practice
Example 1 13 1.3 1.3 0.5 0.065 2 - 39.15 39.15 3 -
0.05 0.5 0:40 0:55 practice
Example 2 12 1.2 1.2 0.5 0.060 2 - 39.72 39.72 3 - 0.10 0.5 1:20 1:35 practice
Example 3 11 1.1 1.1 0.5 0.055 2 - 40.28 40.28 3 - 0.020 0.5 2:10 2:25 practice
Example 4 10 1.0 1.0 0.5 0.050 2 - 40.83 40.83 3 - 0.30 0.5 3:30 3:50

In the case of Example 1 hardening so fast that it is difficult to secure the workability to ensure the workability by adding tartaric acide (C ₄ H ₆ O ₆ ) to 0.1 ~ 0.3 to control the reaction time of cement and α- hemihydrate gypsum Solved.

As a result, it was possible to secure a working time of up to 3 hours and 30 minutes from the first 1:20 minutes.

Retarder generally refers to a material that inhibits the hydration of cement to retard condensation or hardening of concrete.

Cement hydration occurs because cement produces calcium hydroxide, ethrinite, calcium silicate hydrate, etc. when it comes in contact with water. Therefore, the calcium ion (Ca ^{+ 2} ) in the liquid phase increases and decreases again after reaching the highest value, and the time until reaching the ultrahigh value is the start time of production or the start of condensation of calcium silicate hydrate.

Therefore, chemicals that extend the time (maximum time under supersaturation) of the liquid Ca ⁺² to its maximum function as a retarder and generally block the liquid Ca ⁺² (complexing Ca). ), Or to make a hydration prevention film on cement particles becomes a retardant.

However, when the amount of the retardant is used over a certain amount, there is a problem in workability due to overdelay, and there is a problem in that initial strength expression is lowered.

As a result of this test, when the amount of retardant was used more than 0.4%, there was a problem in the field construction because the condensation delay was too high.

5. Whitening outbreak test

The whitening test was conducted by comparing the composition prepared in Example 3 with Comparative Example 1.

In the test, a 10% NaCl ₂ aqueous solution was prepared to promote whitening and visually observed. The results are shown in [Table 6] and [FIG. 3].

[Table 6] Results of whitening development test

division Whitening occurrence Comparative Example 1 U Example 3 radish

As shown in FIG. 3, in the case of the comparative example, white phenomena occurred on the surface from 3 days after immersion, whereas in Example 2, stearic acid salt (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) was used. There was no whitening due to the whitening inhibitory effect.

However, as the amount of stearic acid used increased, the effect of suppressing bleaching was enhanced. However, when using more than 1.0% of cement, the permeability decreased, and the proper amount of use was about 0.3 ~ 0.6%.

 6. Freeze thawing test

The freeze-thaw resistance test was conducted in accordance with the test method for the resistance of concrete to rapid freezing and thawing. The test results are as follows.

[Table 7] Measurement of freezing resistance

Cycles 0 30 60 90 120 150 180 210 240 270 300 condition
Dongtang coefficient (%) Example 2 98.35 97.75 91.24 86.93 82.7 79.5 72 68.25 57.89 - - compare
Example 1 92.24 88.63 79.56 74.16 65.22 53.05 - - - - -

In the case of the mortar for permeable concrete prepared in Example 2, the modulus of elasticity was maintained at 68.25% at 210 cycles, and in Comparative Example 1, the relative dynamic modulus was 65.22% at 120 cycles.

As shown in Table 7, Example 2 was found to have excellent freeze-thawing resistance compared to Comparative Example 1.

1 Schematic diagram of the upper edge of various plaster

Figure 2 is a graph of the result of measuring the change in length of the present invention

Figure 3 photograph of the test results of the bleaching test of the present invention

Claims (5)

 In the pitcher concrete composition, Portland cement 20-40 kg, 2-15 kg of α-half gypsum, Calcium sulfo aluminate (CSA) 2-10 kg, Quicklime (CaO) 0.5-5 kg, Retardant 0.05∼1.0kg, 1 to 3 kg of natural palm fiber, High performance water reducing agent 0.5 ~ 1.0kg, Stearate (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) 0.1-0.5 kg, 3 ~ 20kg fine powder (2,000 ~ 5,000cm ² / g) Permeable concrete composition characterized in that the aggregate is composed of 70 ~ 90kg aggregates mixed with 35 ~ 45kg of aggregate size 5 ~ 10mm ocher aggregate, 35 ~ 45kg aggregate size 5 ~ 10mm. The method of claim 1, wherein the retardant is any one compound selected from tartaric acid (C ₄ H ₆ O ₆ ), citric acid (C ₆ H ₈ O ₇ ) or two or more compounds, The natural fiber is any one compound selected from palm fiber, sugarcane fiber, jute fiber, or a pitcher concrete composition, characterized in that it is composed of two or more compounds. The water-permeable concrete composition according to claim 1, wherein the high performance sensitizer is any one compound selected from naphthalene compounds, ligline compounds, and polycarboxylic acid compounds, or is composed of two or more compounds.  The water permeable concrete composition according to claim 1, wherein the anti-whitening agent is any one compound selected from stearic acid compounds and silane compounds or is composed of two or more compounds. In the method for producing a water-permeable concrete composition, 20 ~ 40kg Portland Cement, 2 ~ 15kg α-Half Gypsum, 2 ~ 10kg CSA (Calcium sulfo aluminate) and 0.5 ~ 5kg CaO, with super speed, high strength and expansion control material. Tartaric acide (C ₄ H ₆ O ₆ ) 0.05∼1.0kg Powdered naphthalene-based high performance water reducing agent 0.5 ~ 1.0kg As a retardant, stearic acid salt (Ca (C ₁₈ H ₃₅ O ₂ ) ₂ ) was added to prevent bleaching. 1 ~ 3kg, 0.1 ~ 0.5kg of natural palm fiber for improvement, 3 ~ 20kg of fine powder (2,000 ~ 5,000cm ² / g) and finely ground crushed pine granite with ball mill to give the function of far infrared rays and deodorizing effect Permeable concrete composition characterized in that it is prepared by mixing 80 ~ 85kg of soybean gravel generated as a by-product after sand sorting at 5-10 mm aggregate and crushed brick in 120 to 200 seconds in a high-density mixer (drum type) Manufacturing method.

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