KR20030004194A - Manufacturing Methods of Hybrid Type Concrete Pavement using Recycled and Crushed Aggregates - Google Patents

Abstract

PURPOSE: A hybrid high-performance permeable concrete pavement using regenerated aggregate and crushed aggregate is provided to improve the efficiency of permeable concrete, to secure the stability on traveling and water resources and to reduce traffic noise. CONSTITUTION: The hybrid high-performance permeable concrete pavement is manufactured by mixing first or third-class cement, a polymer dispersant, a high-performance air entraining and water reducing agent or assimilator, 5-40 volume percent fly ash as an industrial byproduct, 5-20 volume percent silica fume of cement, and 5-30 volume percent blast furnace slag fine aggregate or crushed fine aggregate of paste.

Description

Manufacturing method of Hybrid Type Concrete Pavement using Recycled and Crushed Aggregates}

The present invention uses SBR (Styrene Butadiene Rubber), EVA (Ethylene Vinyl Acetate) as a recycled aggregate or crushed aggregate produced from waste concrete and waste asphalt concrete, which are construction by-products, and polymer dispersant, Using fly ash, blast furnace slag or crushed stone aggregate, it develops and utilizes the manufacturing technology of pavement hybrid permeable concrete with excellent mechanical performance and durability such as compressive strength, flexural strength, abrasion resistance, dynamic stability and permeability coefficient. It is possible to solve the problems such as water film phenomenon and sliding phenomenon, and to reduce noise caused by vehicle driving through groundwater preservation and sound absorption performance, and to improve the performance of road paving body through improving mechanical performance and durability. It is made possible to manufacture. In the present invention, the generation amount is significantly increased, and the developed aggregate produced from the construction by-products that cause various problems, such as fly ash, silica fume, blast furnace slag aggregates, etc., excellent in permeability and compressive strength, The present invention relates to a method for producing an environmentally friendly high performance mixed permeable concrete package having excellent mechanical properties such as bending strength, abrasion resistance, dynamic stability, freeze thawing resistance, and chemical resistance.

Conventional water-permeable concrete pavement has good water permeability but is limited to pedestrian roads and parking lots due to its deterioration in mechanical performance and durability such as compressive strength and flexural strength. In addition, the situation is urgently required to change the use of the road to heavy traffic.

The present invention solves the application limits of conventional permeable concrete packaging by using recycled aggregate or crushed aggregate, silica fume, fly ash and blast furnace slag, polymer dispersant SBR and EVA, and high performance AE water reducing agent, and at the same time compressive strength, flexural strength, wear resistance The purpose of this study is to develop and manufacture environmentally friendly high-performance hybrid hybrid pavement concrete with excellent dynamic stability and durability.

In addition, the present invention uses a high performance air entrained AE reducing agent or a high fluidizing agent in the production of permeable concrete, and to ensure the permeability coefficient and wear resistance, crack resistance, slip resistance, Manufacturing and development of multifunctional hybrid hybrid permeable concrete pavement with excellent mechanical performance such as flexural strength, freeze-thawing resistance, and chemical resistance, to suppress water film phenomenon during rain and improve slip resistance. It is to enable the manufacture and utilization of hybrid permeable concrete packaging with excellent lifespan.

1 is a detailed cross-sectional view (I) of the present invention

Figure 2 is a detailed cross-sectional view of the present invention (II)

Figure 3 is a detailed cross-sectional view of the present invention (III)

4 is a blend design flow chart

5 is a mechanical property of the surface-permeable concrete pavement

6 is a mechanical property of the surface-permeable concrete pavement

7 shows the mechanical properties of the surface-permeable concrete pavement

8 is a mechanical property of the base permeable concrete pavement

9 is a mechanical property of the ground permeable concrete pavement

Aggregate used in the present invention uses the aggregate maximum size of 5 ~ 13mm or 5 ~ 25mm depending on the application, the specific gravity is 2.20 ~ 2.75, unit volume weight 1,150kg / m ³ ~ 1,700kg / m ³ , 40.0% ~ 65.0 Recycled aggregates or crushed aggregates are used. The cement used was one or three kinds of cements that meet the domestic KS standards.In addition, high-purity fly ash has a specific gravity of 1.9 to 2.3, a specific surface area of 3.000 cm ² / g or more, and a particle size of <4.2 × 10. The blast furnace slag had a particle size of 2.5 mm or less, and the blast furnace slag had a specific gravity of 2.69 to 2.75. Mesh type poly with a tensile strength of 3.5 to 7.7 kgf / cm ² , elastic modulus of 3.3 to 3.6 × 104 kgf / cm ² , specific gravity of 0.90 to 0.92 and length of ^{3 to} 25 mm to improve the durability and mechanical performance of the permeable concrete pavement structure The propylene short fibers are mixed with 0.5 to 2.0 vol.% Of the volume ratio of cement, or the diameter is 8 to 13 × 10-3, the length is 3 to 25 mm, the density is 2.54 × 103 kgf / cm ² , the modulus of elasticity is 73.5 to 81.6 × 104 kgf / cm ² Alkali-resistant short glass fiber of was used in a method of mixing 0.5% to 2.0 vol.%.

Environmentally friendly high performance hybrid permeable concrete pavement of the present invention is a method of manufacturing the surface permeable concrete having a predetermined flexural strength by integrating the permeable concrete for surface layer with good permeability, to maintain the design porosity and to ensure the flexural strength A water-cement ratio satisfying the target permeability coefficient value was 20 to 35%, and a multifunctional mixed permeable concrete package having a porosity of 5 to 25% was prepared.

Table 1 shows the required items and target values of the surface layer portion and the substrate portion of the package of the present invention. Concrete pavement is composed of permeable concrete for surface layer having permeability coefficient equivalent to drainage asphalt pavement of surface layer, and permeable concrete for base layer with bending strength equivalent to that of general pavement concrete in base layer. .

Basic specification of each floor Thickness (mm) Basic specification Item Target value Concrete pavement (base part: permeable concrete) 150-300 Consistency of Unconsolidated Concrete Vibration compaction test: compaction rate (vibration 5 seconds) 100 ± 10% Design standard bending strength 42 kgf / cm ² or more Compound flexural strength 50kgf / cm ² or more Permeability coefficient 1.0 × 10 ^-3 cm / sec or more Concrete pavement (surface layer: permeable concrete) 70-150 Mass loss rate by abrasion test 15% or less Consistency of Unconsolidated Concrete Vibration compaction test: compaction rate (vibration 5 seconds) 100 ± 10% Design standard bending strength 40kgf / cm ² or more Compound flexural strength 42 kgf / cm ² or more Permeability coefficient 1.0 × 10 ^-3 cm / sec or more

Mixing example of surface permeable concrete Formulation Number Fly Ash Replacement Rate (vol.%) Blast furnace slag [S] replacement rate (vol.%) Water binding material cost [W / B] Unit amount (kg / cm ²⁾ Binder [B] Water [W] Fine Aggregate [S] ***** Coarse Aggregate [G1] Class 1 Plain and Class 3 Steel Cement [C] * Fly Ash [FA] A-1 ** 20 0 30 256 (256) 64 (64) 96 (96) 0.0 (0.0) 1530 (1530) A-2 5 256 (256) 64 (64) 96 (96) 19.1 (18.9) 1620 (1511) A-3 10 256 (256) 64 (64) 96 (96) 38.1 (37.9) 1570 (1492) A-4 20 256 (256) 64 (64) 96 (96) 76.3 (75.8) 1454 (1454) A-5 30 256 (256) 64 (64) 96 (96) 114.4 (113.7) 1416 (1416) B-1 *** 20 0 30 272 (272) 68 (68) 102 (102) 0.0 (0.0) 1620 (1620) B-2 5 272 (272) 68 (68) 102 (102) 20.3 (20.1) 1600 (1600) B-3 10 272 (272) 68 (68) 102 (102) 40.5 (40.3) 1579 (1580) B-4 20 272 (272) 68 (68) 102 (102) 81.1 (80.5) 1539 (1539) B-5 30 272 (272) 68 (68) 102 (102) 121.6 (120.8) 1498 (1499) C-1 **** 20 0 30 264 (264) 66 (66) 99 (99) 0.0 (0.0) 1570 (1570) C-2 5 264 (264) 66 (66) 99 (99) 19.7 (19.5) 1600 (1550) C-3 10 264 (264) 66 (66) 99 (99) 39.3 (39.1) 1581 (1531) C-4 20 264 (264) 66 (66) 99 (99) 78.7 (78.1) 1541 (1492) C-5 30 264 (264) 66 (66) 99 (99) 118.0 (117.2) 1502 (1453)

* Cement [C]: In the table, the value in () is the unit weight in the compound when KS standard type 1 ordinary portland cement is used.

** A: Permeable concrete for surface layer using recycled aggregate with specific gravity 2.23 and coarse aggregate max. 20mm

*** B: Permeable concrete for surface layer using crushed aggregate of specific gravity 2.59 and particle size range 5 ~ 13mm

**** C: Permeable concrete for surface layer using recycled aggregate with specific gravity of 2.25 and particle size range of 5 ~ 13mm

***** Fine Aggregate [S]: Used Aggregate Aggregate contains 5 ~ 30% of blast furnace slag fine aggregate or crushed aggregate by paste volume ratio.

[Note] High performance AE water reducing agent (B ×%): 1.0% by weight of binder

The blending of permeable concrete pavement for surface layer changed the blast furnace slag substitution rate to 5%, 10%, 20%, and 30% for the fly ash substitution rate of 10-30%, and the recycled aggregates had a specific gravity of 2.20-2.40 and the coarse aggregate maximum size of 25mm. The following was applied, and the crushed aggregate was set to each formulation by applying aggregate having a specific gravity of 2.60 to 2.70 and a particle size range of 5 to 13 mm.

Formulation example of base permeable concrete Formulation Number Design Porosity (%) Water cement ratio (%) Unit weight (kg / cm2) Water [W] Class 1 Regular and Class 3 Crude Cement [C] * Fine Aggregate [S] Coarse Aggregate [G2] D-1 ** 10 20 72 360 410 1560 D-1 25 83 330 361 1560 D-3 30 90 300 311 1560 D-4 35 95 270 252 1560 E-1 *** 10 20 72 360 410 1646 E-1 25 83 330 361 1646 E-3 30 90 300 311 1646 E-4 35 95 270 252 1646 * Cement [C]: Cement used when mixing KS standard type 1 ordinary portland cement or 3 type crude steel cement ** D: Specific gravity 2.20 ~ 2.40 and coarse aggregate with base aggregate using coarse aggregate with max. 25mm of coarse aggregate *** E: Permeable concrete for base material using crushed stone aggregate with specific gravity of 2.60 to 2.70 and particle size range of 5 to 25mm (Note) High performance AE water reducing agent

The actual mixing of basement permeable concrete pavement changes the water cement ratio to 20%, 25%, 30%, and 35% for 10% of design porosity while the applied aggregate is recycled aggregates with a specific gravity of 2.20 ~ 2.40 or less and 13mm or less of aggregate. Each mixture was set using crushed aggregates having a particle size range of 5 to 13 mm and ˜2.70.

As a test method for environment-friendly high-performance hybrid permeable concrete pavement, the bending strength is compacted to a predetermined density by vibrating table using a mold of 15 × 15 × 55cm, and tested according to KS F 2407, 2408 [Testing method of bending strength of concrete]. The permeability coefficient was in accordance with JCI Eco Concrete Research Committee [Permeability Test Method of Porous Concrete] and the head head difference was 12.5cm. The abrasion resistance test was performed by putting 30 kg of dry sand of 0.3 to 5mm and 6 steel balls (weight 438g) of 47.5mm in diameter into a Los Angels tester for aggregate test. After putting the drum into the drum 30 times to 30 to 33 times per minute, the weight of the specimen was measured to determine the weight loss.

Mechanical Properties of Permeable Concrete Pavement for Surface Layers Example Flexural strength (kgf / cm ² ) Permeability coefficient (× 10 ^-2 cm / s) Weight loss rate (%) A-1 51 19.1 9.7 A-2 53 10.3 9.5 A-3 49 22.3 10.5 A-4 48 24.7 11.5 A-5 49 25.8 14.6 B-1 55 14.3 8.5 B-2 54 12.6 8.8 B-3 54 18.6 9.4 B-4 52 17.5 9.8 B-5 53 21.3 10.3 C-1 52 14.3 10.4 C-2 51 12.6 10.6 C-3 48 18.6 11.7 C-4 49 17.5 12.3 C-5 47 21.3 14.6

Mechanical Properties of Ground Permeable Concrete Pavement Example Flexural strength (kgf / cm2) Permeability coefficient (× 10-2cm / s) Weight loss rate (%) D-1 53 9.5 8.7 D-2 51 10.4 10.5 D-3 49 12.5 13.5 D-4 47 13.6 16.7 E-1 57 8.3 7.6 E-2 56 9.7 9.7 E-3 53 11.8 12.5 E-4 49 12.9 14.6

As a result of the flexural strength test, the flexural strength of the fly ash substituted tended to decrease as the substitution rate increased, but the target value was satisfied within 30% of the substitution rate. In addition, the blast furnace slag fine aggregate was not found to decrease the flexural strength within this test range. The permeability coefficient was about 15%, which satisfies the criterion regardless of the substitution rate, and the wear test showed that the loss rate increased with the increase of the substitution rate. When the industrial by-product is not added, the fly ash substitution rate that satisfies the equivalent physical properties is fixed to 20%, and the replacement rate of the blast furnace slag fine aggregate is within 20%, which satisfies each reference value. For the purpose of evaluating the durability of paving concrete, the flexural failure test of the base permeable concrete was conducted. The specimens were 10 × 10 × 50cm, and the loading method was the sine wave 5Hz third point method with the upper limit load being 60% and 70% of flexural strength ratio (stress ratio). In addition, the test was carried out in a state in which the water-containing specimen was coated with a vinyl film in consideration of the influence of the gap number in common use. When the average number of fractures (breakages) of three specimens was used as the failure life, the specimens were destroyed at 2 million times in all specimens at a stress ratio of 60%, and two specimens at 1.2 million, one at a stress ratio of 70%. Has been destroyed at 1.6 million times. Fracture life of the base-permeable concrete showed more than equivalent results for ordinary pavement concrete under the same test conditions for pavement concrete.

Test result of commonness of permeable concrete pavement Measurement result Target value DT before driving After driving DT Field Permeability Test (cm / sec) 2.4 × 10 ^-1 2.6 × 10 ^-1 More than Flatness (3m Profile) (mm) 1.96 1.75 2.4 or less Wear resistance 64 64 60 or more

Abrasion test, rotary wheel tracking test, and reciprocating in-vehicle labeling test were conducted using specimens collected on-site for the purpose of evaluating the road commonality such as aggregate scattering resistance and abrasion resistance.

Aggregate scattering resistance test results of collected specimens Measurement result Remarks Abrasion Test Mass Loss Ratio (%) 14.0 Target value: 15% or less Rotary wheel tracking test displacement (mm) 20 ℃ 0.70 Drainage Ascon (20% Void) 0.61 60 ℃ 0.00 Drainable Ascon (20% Void) 5.82 Chain labeling test (cm2) 0.35 to 0.58 Drainage Ascon (17% Pore) 0.47

Looking at the results of the aggregate scattering resistance of the specimens collected here, the common performance of the water-permeable concrete pavement showed the same or better results compared to the drainable ascon pavement, it is possible to apply a wide range of applications by considering the effective use of industrial by-products and the environment.

As described above, the present invention is a physical and mechanical properties using high purity fly ash, blast furnace slag, industrial by-products, mesh type polypropylene short fiber, alkali resistant glass short fiber to increase strength and toughness, as well as excellent crack suppression effect and proof strength. And, if the stabilization method and processing of the subsidiary base layer is completed according to the ground conditions, the environment-friendly hybrid hybrid permeable concrete pavement with excellent durability is manufactured only by the surface permeable concrete, and the composite permeable concrete pavement is manufactured to improve the performance and function of the existing permeable concrete. It is effective in securing driving stability, securing water resources, and reducing traffic noise while satisfying, and it is an invention with bright prospects in terms of expansion and effective use in the future.

Claims (4)

For the manufacture of environment-friendly high-performance hybrid permeable concrete packages, one or three cements and aggregates with the KS standard maximum size of 5 ~ 13mm or 5 ~ 25mm, specific gravity 2.20 ~ 2.70, unit volume weight 1,200kg / m ³ ~1,700kg / m ^3, performing rate 45.0% ~60.0% of the recycled aggregates, or using crushed stone aggregate and specific gravity 1.9 to 2.3 depending on the application, a specific surface area of 3.000cm ² / g or more, a particle size <4.2 × 10 ^-2 in Fly ash and particles having a particle size of 2.5 mm or less, blast furnace slag aggregate or crushed stone aggregate having a specific gravity of 2.60 to 2.75 is mixed in a paste volume ratio of 5 to 20%. According to claim 1, 1 or 3 kinds of cement and aggregates with the maximum size of 5 ~ 13mm or 5 ~ 25mm, specific gravity 2.20 ~ 2.70, unit volume weight 1,200kg / m ³ according to the use of environment-friendly high performance hybrid permeable concrete packaging Recycled aggregate or crushed aggregate with ~ 1,700kg / m3, 45.0% ~ 60.0% performance rate is used, and water-cement ratio is 20-40% according to the condition of the ground, and it can be constructed only by the surface layer after completion of the lower auxiliary layer. Manufacturing method According to claim 1, When manufacturing the environment-friendly high-performance hybrid permeable concrete packaging, the water-cement ratio is 25% to 35% and the high performance AE water reducing agent is mixed with 0.3% to 2.0% of the cement weight to increase the flowability and durability of the cement paste. Way According to claim 1, In order to improve the durability and crack resistance in the manufacture of environment-friendly high-performance hybrid permeable concrete packaging, alkali resistance glass fibers having a fiber length of 3 to 20 mm are mixed with 0.5 to 2.0 vol.% (Volume ratio to cement). Polypropylene chopped fibers with a fiber length of 3 to 20 mm or 0.5 to 2.0 vol.% (Volume to cement) or a polymer dispersant to 5 to 20 wt.% (Weight to cement). Manufacturing method