KR100428557B1 - A high-performance porous concrete composition with a granulated mineral admixtures - Google Patents

Abstract

The present invention relates to a water-permeable concrete composition used for road paving and a method for manufacturing the same, and more particularly, to increase the adhesive strength of the interface between the aggregate and the cement paste, the compressive strength of the permeable concrete consisting of aggregate, water and Portland cement And 90 ~ 110kg / ㎥ water, 0.5 ~ 2.5% by weight of high performance AE water reducing agent and 1 ~ 10% by weight of mineral fine powder One suspension is mixed with 1500 ~ 1700kg / ㎥ of crushed aggregate of aggregate size 1.2 ~ 13mm to make the suspension is applied to the surface of the crushed aggregate, and then manufactured by mixing secondary Portland cement 250 ~ 350kg / ㎥ It relates to a high performance water-permeable concrete composition containing a fine mineral powder to be prepared and a method for producing the same.

Description

A high-performance porous concrete composition with a granulated mineral admixtures}

The present invention relates to a water-permeable concrete composition used for road paving and a method for manufacturing the same, and more particularly, to increase the adhesive strength of the interface between the aggregate and the cement paste, the compressive strength of the permeable concrete consisting of aggregate, water and Portland cement And 90 ~ 110kg / ㎥ water, 0.5 ~ 2.5% by weight of high performance AE water reducing agent and 1 ~ 10% by weight of mineral fine powder One suspension is mixed with 1500 ~ 1700kg / ㎥ of crushed aggregate of aggregate size 1.2 ~ 13mm to make the suspension is applied to the surface of the crushed aggregate, and then manufactured by mixing secondary Portland cement 250 ~ 350kg / ㎥ It relates to a high performance water-permeable concrete composition containing a fine mineral powder to be prepared and a method for producing the same.

Generally, the permeable concrete composition is manufactured by mixing cement, water, and crushed aggregate at a predetermined ratio so that a plurality of continuous pores exist between aggregates coated with cement paste to secure permeability. By paving the surface of the road, the surface of the road is smoothly drained, and the effect of preventing the fall of the road surface temperature and increasing the plant growth is enhanced.

The water-permeable concrete composition is mainly used as a road paving material due to the light load of sidewalks and bicycle roads due to its low strength compared to ordinary cement concrete compositions due to the voids to secure permeability. Its application is insignificant in the roads for automobiles, and the water-permeable concrete composition is chemically reacted with calcium hydroxide (Ca (OH) ₂ ) in the water-permeable concrete composition as water, acidic or basic substances pass through a plurality of pores, There was a problem that the water permeated between the interior and the surface erosion or between the pores freeze-expanded by the temperature decrease in winter, so that the water permeable concrete composition is easily damaged and loses its function, thereby shortening its lifespan.

In order to improve the problems such as reduced strength and short life of the permeable concrete, a number of permeable concrete manufacturing methods have been developed as of the 1970s. In the US Patent Registration No. 3870422 (registered on March 11, 1975) The coarse aggregate has an average diameter of about 1/4 inch, and the volume ratio of cement, fine aggregate (sand) and coarse aggregate is 1: 0: 3 or 1: 1/4: 3, respectively, and the volume ratio of binder and water such as epoxy resin is A technology for manufacturing concrete mixtures for water permeable packaging at 1: 3 has been disclosed. In Korea Patent Publication No. 1990-0004390 (1990. 06. 23. notification), water 116kg / m3, cement 292kg / m3, fine aggregate Permeable concrete composed of 87kg / ㎥, coarse aggregate 1690kg / ㎥, pigment 7.0kg / ㎥, admixture 0.58kg / ㎥ was disclosed, Republic of Korea Patent Publication No. 1991-0006894 (August 19, 1991) Cement Concrete Mixture 1㎥ To 300 with respect to Portland cement, cement 1 part by weight of 400kg it is disclosed a way to make the permeability of cement-concrete structures consisting of forms from 0.005 to 0.1 parts by weight of a binder and 0.35 to 0.45 parts by weight of water and the balance parts of aggregate.

However, the above-described techniques are added and mixed with fine aggregate (sand) or binder in the permeable concrete composition in order to enhance the strength of the permeable concrete composition, in the case of the permeable concrete composition containing fine aggregate (sand) in the permeable concrete composition As fine aggregates (sand) are inserted between the formed pores, the pores become smaller and the permeability is lowered. In the case of the permeable concrete composition in which the binder is added and mixed, the binder itself is very expensive and the production cost increases so that it is not economically practical. There was a problem that became difficult.

On the other hand, the strength of the concrete composition is highly dependent on the bond strength between the aggregate and the cement paste, which is generally the strength of the aggregate in the concrete composition is higher than that of the cement paste and the strength of the cement paste is the interface between the aggregate and the cement paste. This is because the adhesion strength is higher than.

Investigation of the fracture surface through the compressive strength test of the specimen made of the permeable concrete composition shows that the periphery of the permeable concrete composition is cracked and broken, and that the cement paste at the interface part bonded to the aggregate is peeled or cracked as it is from the aggregate. A large number of these phenomena can be found, which is caused by the presence of numerous voids at the interface between the aggregate and the cement paste with irregular surfaces, and the cement paste and the surface of the aggregate are not closely adhered and adhered to the interface between the aggregate and the cement paste. As the pore volume is greater than the pore volume in the cement pool itself, a crack occurs first at the interface between the aggregate and the cement pool, and water, acidic or basic substances easily penetrate through the interface and erode, thereby lowering the adhesion strength between the aggregate and the cement pool. By pitcher concrete jaw It is a factor that lowers the strength of the material.

The present invention is to solve the above problems by adding a fine mineral powder to increase the adhesion strength of the interface between the aggregate and the cement paste, and to increase the strength of the cement paste itself, permeable concrete consisting of aggregate, water and Portland cement The purpose is to increase the compressive strength and durability of the composition while maintaining a high level of water permeability.

In order to achieve this purpose, a suspension and aggregate size of 1.2 to 13 mm in which 90 to 110 kg / m3 of water and 0.5 to 2.5 wt% of a high performance AE water reducing agent with respect to cement weight and 1 to 10 wt% of mineral fine powder with respect to cement weight are mixed. It is a feature of the present invention that the suspension is applied to the surface of the crushed aggregate by first mixing the crushed aggregate 1500 ~ 1700kg / ㎥ and then the second mixture of the portland cement 250 ~ 350kg / ㎥.

Hereinafter, the configuration of the present invention in detail.

The permeable concrete composition according to the present invention is used for road paving, which is a mixture of 90 to 110 kg / m 3 of water and 0.5 to 2.5 wt% of a high performance AE water reducing agent and 1 to 10 wt% of mineral fine powder based on cement weight. The suspension and the aggregate size of 1.2 ~ 13mm crushed aggregate 1500 ~ 1700kg / ㎥ first mixed to make the suspension is applied to the surface of the crushed aggregate, and then prepared by mixing a second mixture of Portland cement 250 ~ 350kg / ㎥ By improving the strength and durability, the compressive strength of 150 days is maintained at 150 ~ 300kg / ㎥, and the flexural strength is 35 ~ 50kg / ㎥, and the permeability coefficient is 0.05 ~ 0.5cm / sec to show high strength, durability and permeability. It is intended to provide a water-permeable concrete composition having.

Aggregate is used as a crushed stone aggregate with 5 to 30% of the weight percentage of the 5mm sieve. If the 5% of the weight of the sieve is less than 5%, the permeability is good but the strength is lowered. Since the strength is increased but the permeability is lowered, the aggregate used in the present invention, the aggregate size 13 ~ 2.5mm aggregate in accordance with the Korean Industrial Standard (KSF 2527) is passed through all 19mm sieve, and the weight percentage of the passage of 13mm sieve 90 ~ 100% , The percent by weight of the 10 mm sieve is 40-75%, the percent by weight of the 5 mm sieve is 5-25%, the percent by weight of the 2.5 mm sieve is 0-10%, and the percent by weight of 1.2 mm sieve is 5% or less. Aggregate size 10 ~ 2.5mm Aggregate passes through all 13mm sieves, 85% by weight percentage of 10mm sieves, 10 ~ 30% passing weight percentage of 5mm sieves, 0% by weight of 2.5mm sieves ~ 10%, the weight percentage of the 1.2mm sieve less than 5% to use.

High-performance AE water reducing agent is a chemical admixture used to reduce the unit quantity when blending permeable concrete to enhance strength and durability, and various products such as polycarboxylic acid, melamine, and naphthalene are commercially available. When less than 0.5% by weight of cement is added, air entraining and water-reducing effects are not exerted, so it is difficult to expect the strength of permeable concrete to increase, and when it exceeds 2.5% by weight of cement. In the present invention, since the loss of the slump value according to the elapsed time is large and the amount of air is entrained excessively to decrease the strength of the concrete, in the present invention, 0.5 to 2.5% by weight of the high-performance AE water reducing agent is added to the cement weight to increase the water-cement ratio ( By lowering W / C), durability such as freeze-thawing resistance, chemical resistance, abrasion resistance, etc. can be improved by increasing the strength. It can control.

If necessary, AE water reducing agent can be used instead of AE water reducing agent. In this case, AE water reducing agent is mixed with 0.3 ~ 1.0% by weight based on the weight of cement. And less water-reducing effect, when added in excess of 1.0% by weight with respect to the cement weight, the coagulation of the permeable concrete is delayed, thereby lowering the strength of the permeable concrete composition.

As the AE reducing agent, products such as lignin sulfonic acid or oxycarboxylic acid are mainly used.

As the fine mineral powder used in the present invention, pozzolan materials, ground granulated limestone, ground granulated blast-furnace slag, and the like are used.

The pozzolanic material in the mineral fine powder is subjected to a pozzolanic reaction in the water-permeable concrete composition, and the reaction is a calcium silicate hydrate (Ca (OH) ₂ ), which is formed during the cement hydration reaction, and the pozzolanic material. Calcium silicate hydroxide gel, CSH (gel)) and aluminosilicate hydrates containing amorphous alkalis are formed and filled between the pores of the water-permeable concrete composition to harden the structure of the hardened body to increase strength. And the watertightness is enhanced to enhance durability, and the limestone powder containing calcium carbonate (CaCO ₃ ) as the main component of the fine mineral powder is reacted with calcium carbonate (CaCO ₃ ) to cement to form a carbon aluminate hydroxide gel. The blast furnace slag powder is converted into minerals that express strength by reacting with calcium hydroxide It contributes to increasing the strength of the concrete composition.

In the present invention, a diazoite having a high content of silicon dioxide (SiO ₂ ), fly ash, silica fume, which is a highly active pozzolanic material, and the like are used as pozzolanic materials. Pozzolan material is added, and the pozzolan material is applied to the surface of the aggregate which is mixed with water and high-performance AE reducing agent in the form of a suspension, which is first mixed with the aggregate and irregularly added to the aggregate surface. To increase the adhesion strength of the interface between the aggregate surface and the cement paste by producing calcium silicate hydrate and aluminosilicate hydrate on the aggregate surface during the pozzolan reaction, and the excess pozzolanic material not applied to the aggregate surface is cement paste. Pozzolanic reaction in mixed state to enhance the strength and durability of cement paste itself. .

The diatomaceous earth is a water-aqueous amorphous silica composed of cell wall bones of fine aquatic tanks, and is heated to 600 to 1200 ° C. to remove clay components and to activate the pozzolanic reaction, but with silicon dioxide (SiO ₂ ). The component is 80 to 95% by weight, and the through-weight percentage of the 45 μm sieve is 90 to 99%. In the present invention, 1 to 10% by weight of diatomaceous earth is added to the cement weight. It is to add 1 to 5% by weight relative to.

The silica fume is an ultra-fine particle by-product generated by mixing and floating a silicon alloy such as silicon or ferrosilicone in an exhaust gas when suspended in an exhaust gas, and using a specific surface area of 150,000 to 250,000 cm 2 / g and a silicon dioxide component of 80 to 95% by weight. In the present invention, 1 to 10% by weight of silica fume is added based on the weight of cement, more preferably 1 to 5% by weight based on the weight of cement.

The fly ash is a mixed material representative of pozzolanic material as a particle having a specific particle size range recovered by a dust collector using coal dust as a fuel in a combustion boiler such as a thermal power plant as a fuel collected in waste gas discharged at a high temperature of about 1400 ° C. In the present invention, according to the KSL 5405 standard according to the properties of the fly ash, the components of silicon dioxide is 45 to 60% by weight and use a specific surface area of 2,400 ~ 4,000 cm2 / g, 1 to 10 by weight of the cement Add% fly ash.

Limestone powder or blast furnace slag powder other than pozzolanic material in mineral fine powder is added 1 ~ 10% by weight based on the weight of cement, and limestone powder or blast furnace slag powder is mixed with aggregate in the form of suspension mixed with water and high performance AE water reducing agent. The cement, which is applied to irregular aggregate surfaces and is added and mixed secondly, is chemically reacted with limestone powder or blast furnace slag powder applied to the aggregate surface, and the aggregate surface is changed to carbon aluminate hydrate or other minerals expressing strength. It is designed to increase the adhesion strength of the interface between cement and cement paste, and the excess limestone powder or blast furnace slag powder which is not applied to the aggregate surface is chemically reacted in the cement pool to enhance the strength and durability of the cement paste itself. It is supposed to be.

In the present invention, the limestone powder is used as the percent by weight of the 45㎛ sieve 75 ~ 95%, blast furnace slag powder according to KSF 2563 standard 28-day activity index of 75 ~ 105, the density is 2.8 ~ 2.95kg / M3 and specific surface area of 3,000 ~ 10,000㎠ / g are used.

In preparing the suspension by mixing the fine mineral powder with water and a high performance AE reducing agent, when the fine mineral powder is added in an amount less than 1% by weight based on the weight of cement, the amount of the fine mineral powder adhered with water is too small to adhere to the aggregate surface. When the strength is increased, if it is added in excess of 10% by weight, the amount of fine mineral powder attached to the aggregate surface with water or contained in the cement pool is too high to reduce the porosity of the permeable concrete, resulting in poor permeability. Therefore, only when the fine mineral powder is added at an optimum ratio of 1 to 10% by weight based on the weight of cement, it will produce a water-permeable concrete composition having the best adhesion strength and water permeability at the same time.

On the other hand, the volume fraction of the water-permeable concrete composition increased with the addition amount of the fine mineral powder is adjusted to reduce the amount of crushed aggregates.

Embodiments according to the present invention are as follows.

<Table 1> blends 1, 3, and 5% by weight of diatomaceous earth in the fine mineral powder, respectively, to mix the permeable concrete composition, and measure the compressive strength and the permeability coefficient of 28 days and 28 days. One experimental result table.

The crushed aggregate was 13mm in aggregate maximum size and used in conformity with KSF 2527 standard, which is the Korean industrial standard.The diatomaceous earth had a 99% through weight percentage of 45㎛ sieve, 90% by weight of silicon dioxide, 2.33 specific gravity and fired at 1200 ℃. Handong Diatomite Co., Ltd. was used, cement was used for ordinary Portland cement, and high-performance AE water reducing agent used polycarboxylic acid RHEOBUILD SP-8N product of Korea Master Builders Co., Ltd.

Mixing of the material is first put the crushed aggregate in a mixer rotating at 22rpm, water, high-performance AE sensitizer and diatomaceous earth is added to the mixture for 30 seconds, and then added to the common Portland cement for 120 seconds to mix the permeable concrete composition Was completed.

<Table 1> Experimental results and formulation of permeable concrete composition using diatomaceous earth

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Diatomaceous earth High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 1-1 30 90 300 1600 - 3 201 36 0.25 1-2 30 90 300 1597 3 3 231 41 0.22 1-3 30 90 300 1590 9 3 258 45 0.20 1-4 30 90 300 1583 15 3 262 46 0.18

In Table 1, the specimen for compressive strength for measuring the compressive strength (10 cm in diameter, 20 cm in height) is compacted on a flat round iron plate with a rammer of 2.5 kg in weight and 25 layers at 30 cm in height. The upper surface was flattened and then capped, demolded after 24 hours, and cured in the water during the aging period to prepare specimens, and the compressive strength was measured according to the provisions of KSF 2405.

Specimens for flexural strength (53cm wide, 15cm long, 15cm high rectangular parallelepiped) were measured on a flat rectangular steel plate with a rammer weighing 2.5kg and then double-layered at 30cm in height 100 times and demoulded after 48 hours. The specimens were prepared by standard curing, and the flexural strength was measured according to the provisions of KSF 2408.

The specimen for measuring the coefficient of permeability (cylindrical 10cm in diameter and 15cm in height) is a rammer weighing 2.5kg on a flat round steel plate, and is compacted into two layers of 30cm at 25cm in height, demolded after 24 hours, and cured as standard. The specimens were prepared and the permeability coefficient was measured by the hydrostatic permeability test.

<Table 2> is a fly ash of the fine mineral powder is added by mixing 2, 6, 10% by weight with respect to the cement weight, respectively, to mix the permeable concrete composition, and according to the 28-day compressive strength and 28-day bending strength and permeability coefficient It is a table of measured experimental results.

Crushed aggregate, cement and high performance AE water reducing agent used the same material as the experiment shown in Table 1 above, fly ash was used as a component of the silicon dioxide 45% by weight according to the KSL 5405 standard and the specific surface area of 2,400 ㎠ / g, The formulation of the materials was carried out in the same order and method as Table 1.

<Table 2> Experimental results and formulation of water permeable concrete composition using fly ash

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Fly ash High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 2-1 30 90 300 1600 - 3 191 34 0.25 2-2 30 90 300 1593 6 3 218 39 0.20 2-3 30 90 300 1579 18 3 230 41 0.18 2-4 30 90 300 1565 30 3 231 42 0.16

The compressive strength, flexural strength, and permeability coefficient of Table 2 were measured in the same manner as in Table 1.

<Table 3> is a mixture of permeable concrete composition by adding and mixing 1, 3, 5% by weight of silica fume in the fine mineral powder, respectively, and measure the age 28 days compressive strength and age 28 days bending strength and permeability coefficient One experimental result table.

Crushed aggregate, cement and high-performance AE water reducing agent used the same materials as the experiment in Table 1 above, silica fume has a specific surface area of 200,000 cm 2 / g, silicon dioxide component 93% by weight and specific gravity 2.3 ECONEX Co., Ltd. ( Korea) SILICA-FP (powder type) was used, and the ingredients were mixed in the same order and method as in Table 1.

<Table 3> Blended and Physical Properties of Permeable Concrete Composition Using Silica Fume

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Silica fume High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 3-1 30 90 300 1600 - 3 199 35 0.27 3-2 30 90 300 1597 3 3 220 40 0.24 3-3 30 90 300 1590 9 3 249 44 0.21 3-4 30 90 300 1583 15 3 251 44 0.19

The compressive strength, flexural strength, and permeability coefficient of Table 3 were measured in the same manner as in Table 1.

<Table 4-1> shows the mixing of limestone powder in the fine mineral powder by adding 2, 6, 10% by weight to the cement weight and AE reducing agent, respectively, to mix the permeable concrete composition. This is a table of experimental results of measuring flexural strength and permeability coefficient.

For crushed aggregate and cement, the same materials as in the experiment shown in Table 1 were used, and limestone powder was used as KHW-1800 product of Gyeonggi Mining Co., Ltd., which has a 95% through weight percentage of 45 μm sieve. It was set as the same procedure and method as 1. In addition, the AE reducing agent used lignin sulfonic acid POZZOLITH 84K products of Korea Master Builders Co., Ltd.

<Table 4-1> Experimental Results of Mixing and Properties of Permeable Concrete Composition Using Limestone Powder and AE Reducing Agent

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Limestone powder AE Supervisor 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 4-1-1 34 102 300 1600 - 0.9 182 34 0.28 4-1-2 34 102 300 1591 6 0.9 190 34 0.23 4-1-3 34 102 300 1582 18 0.9 199 36 0.20 4-1-4 34 102 300 1570 30 0.9 199 36 0.16

The compressive strength, flexural strength, and permeability coefficient of Table 4-1 were measured in the same manner as in Table 1.

<Table 4-2> shows 2, 6 and 10% by weight of limestone powder in fine mineral powder, respectively, and mixes permeable concrete composition using high-performance AE water reducing agent. This is a table of experimental results of 28-day flexural strength and permeability coefficient.

Crushed aggregate, cement, and high-performance AE water reducing agent used the same material as the experiment shown in Table 1 above, and limestone powder used KHW-1800 product of Gyeonggi Mining Co., Ltd., which has a 95% passage weight percentage of 45 μm sieve. The formulation of was in the same order and method as in Table 1.

<Table 4-2> Experimental Results of Mixing and Physical Properties of Permeable Concrete Composition Using Limestone Powder and High Performance AE Reducing Agent

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Limestone powder High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 4-2-1 30 90 300 1600 - 3 200 35 0.27 4-2-2 30 90 300 1591 6 3 220 40 0.25 4-2-3 30 90 300 1582 18 3 220 44 0.21 4-2-4 30 90 300 1570 30 3 221 44 0.18

The compressive and flexural strengths and permeability coefficients of Tables 4 and 2 were measured in the same manner as in Table 1.

<Table 5> is a mixture of blast furnace slag powder of mineral fine powder 2, 6, 10% by weight based on the weight of cement, respectively, to mix the permeable concrete composition, according to the age 28 days compressive strength and age 28 days bending strength and permeability coefficient Is a table of experimental results.

The crushed aggregate, cement and high-performance AE water reducing agent used the same materials as the experiments in Table 1, and the blast furnace slag powder had an activity index of 80 days of age according to KSF 2563 standard, density 2.8kg / ㎥, specific surface area 4,500㎠ / g was used, and the formulation of the materials was performed in the same order and method as in Table 1.

<Table 5> Combination and physical property test results of permeable concrete composition using blast furnace slag powder

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Blast Furnace Slag Powder High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 5-1 30 90 300 1600 - 3 195 35 0.27 5-2 30 90 300 1595 6 3 223 40 0.24 5-3 30 90 300 1584 18 3 243 43 0.22 5-4 30 90 300 1573 30 3 243 43 0.17

The compressive strength, flexural strength, and permeability coefficient of Table 5 were measured in the same manner as in Table 1.

<Table 6> adds 5 and 6% by weight of diatomaceous earth and fly ash in the fine mineral powder to cement weight, respectively, and mixes the permeable concrete composition according to the mixing order, according to the 28-day compressive strength and age 28 This is a table of test results for measuring flexural strength and permeability coefficient.

The crushed aggregate was 10mm in aggregate maximum, and used to meet KSF 2527 standard, which is the Korean industrial standard. Cement, high-performance AE reducing agent, and diatomaceous earth used the same materials as in the experiment in Table 1, and fly ash used the same as in Table 2. .

For 6-A-1 and 6-A-2, mix the crushed aggregate first into the mixer, add the ordinary portland cement, mix with the mixer for 30 seconds, and mix the diatomaceous earth or fly ash with water and high performance AE water reducing agent. The water-permeable concrete composition was completed by adding and mixing for 120 seconds.

The material mix of 6-B-1 and 6-B-2 was carried out in the same procedure and method as in Table 1.

<Table 6> Mixing ratio and physical property test results of water-permeable concrete composition when materials are mixed in different order

Boat number Water-Cement Ratio (W / C) Unit weight (kg / ㎥) Experiment result Water (W) Cement (C) Crushed ash Diatomaceous earth Fly ash High performance AE water reducer 28-day compressive strength (kg / ㎠) 28-day flexural strength (kg / ㎠) Permeability (cm / sec) 6-A-1 27 95 350 1580 17.5 - 5.25 261 47 0.10 6-A-2 27 95 350 1576 - 21 5.25 251 45 0.09 6-B-1 27 95 350 1580 17.5 - 5.25 291 50 0.11 6-B-2 27 95 350 1576 - 21 5.25 264 48 0.12

The compressive strength, flexural strength, and permeability coefficient of Table 6 were measured in the same manner as in Table 1.

Depending on the amount of mineral fine powder added to the permeable concrete composition and applied to the aggregate surface as described in Tables 1 to 5, the flexural strength related to the compressive strength and the bending strength of the permeable concrete composition, in particular, the adhesion strength of the interface between the aggregate and the cement paste In the case of diatomaceous earth or silica fume, even if a small amount of less than 5% by weight of cement is used, the 28-day flexural strength of 40kg / ㎠ or more indicates that the design criteria for road pavement (age 28-day) Flexural strength 40kg / ㎠).

Mineral fine powder is applied to the aggregate surface as a suspension and cement is applied on the aggregate surface, and calcium hydroxide (Ca (OH) ₂ ) produced during the hydration of cement and the fine mineral powder are produced through the pozzolanic reaction. As a result, the adhesion strength between the aggregate surface and the cement paste is greatly increased to increase the compressive strength or the flexural strength of the permeable concrete composition. However, when the fine mineral powder is added in excess of 10% by weight based on the weight of the cement, it is difficult to secure water permeability, which is the original use of the water-permeable concrete.

As shown in Table 6, the material mix of 6-A-1 and 6-A-2 is mixed with crushed aggregate first in a mixer and then mixed with ordinary portland cement, followed by water and high performance in diatomaceous earth or fly ash. The water-permeable concrete composition was completed by adding and mixing a suspension mixed with an AE water reducing agent. In this case, the amount of the fine mineral powder applied to the aggregate surface was very small, which did not significantly affect the strength increase, but was formulated according to the present invention. The compressive and flexural strengths of B-1 and 6-B-2 are applied to the aggregate surface and the fine powder is applied as a whole to increase the adhesion strength between aggregate and cement paste, resulting in the compressive strength of 6-A-1 and 6-A-2. The strength is higher than the flexural strength.

The water-permeable concrete composition for road paving can express various colors using pigments. In the present invention, the amount of the inorganic pigment is 2 to 5% by weight with respect to the weight of cement in the range that does not lower the strength of the water-permeable concrete composition. For this long-lasting color finishing effect, a surface treatment agent or water-soluble inorganic coating material containing pigments such as epoxy, acrylic or urethane resins, and iron oxide pigments may be used within 1 mm on the surface of the permeable concrete composition packaged using a brush or spray. It was to apply by thickness.

As the pigment used as the coloring material, pigments such as synthetic iron oxide, chromium oxide, and phthaloxyan series are generally used.

In addition, the properties of the water-permeable concrete composition is affected by the compaction as well as the water-cement ratio (W / C), unlike the ordinary concrete composition. As the porosity increases, the permeability increases, but the strength decreases proportionally, so that the voltage is compacted to maintain the strength and permeability properly. In the present invention, the permeable concrete composition has a porosity of 10 to 25% and 0.05 to 0.5 cm / It will be compacted to have a permeability coefficient of sec.

According to the present invention, as the fine powder is applied to the aggregate surface, not only the adhesion strength of the interface between the aggregate surface and the cement paste is increased, but also the strength of the cement paste itself is increased by the mineral fine powder mixed in the cement paste so that the aggregate, water, and portland cement It can increase the compressive strength and durability of the water-permeable concrete composition and at the same time maintain a high level of water permeability, and the calcium hydroxide component in the water-permeable concrete composition is reduced to react with carbonic acid gas in the air due to the elution of the calcium hydroxide component so that the surface is It is possible to reduce the efflorescence which leads to the white peeling precipitate of calcium, and the problems of strength and durability deterioration in the conventional water-permeable concrete composition are based on the mineral fine powder of the present invention and the high performance AE water reducing agent. Formulation order of the present invention by determining the optimum compounding ratio for each element As a result, it is possible to provide a permeable concrete composition having high strength, high durability and high permeability by improving the adhesion strength of the aggregate-cement paste interface and the cement paste's own strength and adjusting the porosity through compaction. Back to top It is effective to reduce noise and water film phenomenon when driving a vehicle.

Claims (12)

In the manufacturing method of water-permeable concrete composition consisting of water, Portland cement, crushed aggregate, mineral fine powder, high-performance AE water reducing agent, the high-performance AE water reducing agent and cement weight of 0.5 to 2.5% by weight relative to 90 ~ 110kg / ㎥ water and cement weight The suspension is mixed with 1 ~ 10% by weight of mineral fine powder and 1500 ~ 1700kg / ㎥ of aggregates of aggregate size 1.2 ~ 13mm to make the suspension is applied to the surface of the crushed aggregate, and then Portland cement 250 ~ 350kg / ㎥ Method for producing a high-performance water-permeable concrete composition containing fine mineral powder, characterized in that the secondary mixture. In the method for producing a water-permeable concrete composition composed of water, Portland cement, crushed aggregate, mineral fine powder, AE water reducing agent, 90 to 110kg / ㎥ and 0.3 to 1.0% by weight of AE water reducing agent and cement weight to 1 to 10 The suspension is mixed with 10% by weight mineral fine powder and 1500-1700 kg / m3 of crushed aggregate having an aggregate size of 1.2 to 13 mm. The suspension is then applied to the surface of the crushed aggregate. Then, the Portland cement is 250-350 kg / m2. Method for producing a high-performance water-permeable concrete composition containing fine mineral powder, characterized in that the tea mixture. According to claim 1 or 2, wherein the mineral fine powder is silicon dioxide (SiO ₂ ) component of 80 to 95% by weight, the weight percentage of the passage of 45㎛ sieve 90 ~ 99%, heated to 600 ~ 1200 ℃ Method for producing a high performance water-permeable concrete composition containing fine mineral powder, characterized in that the treated diatomaceous earth. The high-permeability concrete containing fine mineral powder according to claim 1 or 2, wherein the fine mineral powder is silica fume having a specific surface area of 150,000 to 250,000 cm2 / g and a silicon dioxide component of 80 to 95% by weight. Method of Preparation of the Composition. The method of claim 1 or 2, wherein the fine mineral powder is a diatomaceous earth or silica fume 1 to 5% by weight based on the weight of the cement mixed, characterized in that the fine powder containing the fine powder containing the high performance permeable concrete composition. According to claim 1 or 2, wherein the fine mineral powder is a high-performance permeable concrete containing mineral powder, characterized in that the fly ash having a component of 45 to 60% by weight of silicon dioxide and a specific surface area of 2,400 to 4,000 cm 2 / g Method of Preparation of the Composition. The method according to claim 1 or 2, wherein the fine mineral powder is a limestone powder containing 75 to 95% of the weight percentage of the 45 μm sieve. According to claim 1 or 2, wherein the fine mineral powder is blast furnace slag powder having an activity index of 75 to 105 days of age, 2.8 ~ 2.95kg / ㎥ and a specific surface area 3000 ~ 10,000 ㎠ / g Method for producing a high performance water-permeable concrete composition containing fine mineral powder characterized in that. The method for producing a high performance water-permeable concrete composition according to claim 1 or 2, wherein an inorganic pigment as a coloring material is added in an amount of 2 to 5% by weight based on the weight of the cement. A water-permeable concrete composition composed of water, Portland cement, crushed aggregate, mineral fine powder, and high performance AE reducing agent, wherein the high performance AE water reducing agent and the weight of cement are 0.5 to 2.5% by weight and 90% to 110kg / m3, respectively. The suspension is mixed with 1% by weight of fine mineral powder and 1500-1700 kg / m3 of crushed aggregate having an aggregate size of 1.2 mm to 13 mm so that the suspension is applied to the surface of the crushed aggregate, and then the second 250-350 kg / m3 of Portland cement is applied. High performance water-permeable concrete composition containing fine mineral powder, characterized in that prepared by mixing. A water-permeable concrete composition composed of water, Portland cement, crushed aggregate, mineral fine powder, and AE water reducing agent, wherein the water is 90 to 110kg / m3 and 0.3 to 1.0% by weight of cement and 1 to 10% by weight of cement. First, the suspension is mixed with the fine mineral powder of and the aggregate size 1500 ~ 1700kg / ㎥ of aggregate aggregate 1.2 ~ 13mm to apply the suspension to the surface of the crushed aggregate, and then the second mixture of 250 ~ 350kg / ㎥ portland cement High-performance permeable concrete composition containing fine mineral powder, characterized in that prepared. The high-performance water-permeable concrete composition according to claim 10 or 11, wherein the fine mineral powder is added in an amount of 1 to 5 wt% based on the weight of cement with diatomaceous earth or silica fume.