Type of Ready Mixed Concrete
※ Product of KS Certification
| Concrete Type | Maximum Dimension of Coarse Aggregate (㎜) |
Slump or Slump Flow (㎜) |
Nominal Strength MPa ( = N/㎡ ) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18 | 21 | 24 | 27 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | Flexural Strength 4.0 | Flexural Strength 4.5 | |||
| Concrete | 20, 25 | 80, 120, 150, 180 | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | – | – | – | – | – | – | – |
| 210 | – | ◯ | ◯ | ◯ | ◯ | ◯ | – | – | – | – | – | – | – | ||
| 500, 600 (*) | – | – | – | ◯ | ◯ | ◯ | – | – | – | – | – | – | – | ||
| 40 | 50, 80, 120, 150 | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | – | – | – | – | – | – | – | |
| Lightweight Concrete | 15, 20 | 80, 120, 150, 180, 210 | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | – | – | – | – | – | – |
| Packed Concrete | 20, 25, 40 | 25, 65 | – | – | – | – | – | – | – | – | – | – | – | ◯ | ◯ |
| High Strength Concrete | 15, 20, 25 | 120, 150, 180, 210 | – | – | – | – | – | – | ◯ | ◯ | ◯ | – | – | – | – |
| 500, 600, 700 (*) | – | – | – | – | – | – | ◯ | ◯ | ◯ | ◯ | ◯ | – | – | ||
Specification Table for Application
| Name | Size | Scale |
|---|---|---|
| Foundation | 25-21-120 | 1-15 floors |
| 25-24-120 | More than 25 floors | |
| Retaining Wall and Slab |
25-21-120 | Less than 5 floors |
| 25-21-150 | 1-10 floors | |
| 25-24-150 | More than 5 floors | |
| 25-27-150 | 1-5 floors | |
| 25-40-150 | More than 30 floors | |
| Septic Tank | 25-18-80 | Burial |
| Road Pavement | 25-21-80 | Alley |
| 25-21-120 | Alley |
Product Requirement
| Category | Remicon Requirement Range for 1 m2 |
Average Remicon Requirement for 1m2 |
Average Requirement | Calculation Method | |||
|---|---|---|---|---|---|---|---|
| Allied and Commercial Housing | 0.40 ~ 0.60 | 0.65 | 2.14 | 평 | * | 2.14 | ㎥ |
| Apartment | 0.40 ~ 0.60 | 0.50 | 1.65 | 평 | * | 1.65 | ㎥ |
| Office (steel frame) | 0.56 ~ 0.62 | 0.59 | 1.94 | 평 | * | 1.94 | ㎥ |
| Office (R/C) | 0.45 ~ 0.55 | 0.62 | 2.04 | 평 | * | 2.04 | ㎥ |
| School | 0.35 ~ 0.65 | 0.50 | 1.65 | 평 | * | 1.65 | ㎥ |
| Factory | 0.52 ~ 0.65 | 0.50 | 1.65 | 평 | * | 1.65 | ㎥ |
| Movie theater | 0.52 ~ 0.90 | 0.71 | 2.34 | 평 | * | 2.34 | ㎥ |
| Bank | 0.56 ~ 0.80 | 0.65 | 2.24 | 평 | * | 2.24 | ㎥ |
Ready Mixed Concrete (KS F 4009)
Construction Materials
| Category | Quality Standard |
|---|---|
| Water | • Water is classified into tap water, water other than tap water, and recovered water. • The solid content of the recovered sludge should not exceed 3 %. |
| Portland Cement | • It refers to the mineral powder that reacts with water and hardens. • 1st Class: normal, 2nd Class: moderate heat, 3rd Class: crude steel, 4th Class: low heat, 5th Class: sulfate |
| Fine Aggregate Coarse Aggregate |
• Aggregates should be clean, strong, and durable, and have reasonable particle sizes. Thin slices, fine slices, organic impurities, chloride, and other harmful substances should not be contained to the aggregate. • Clay Lump: fine aggregate (1.0 % or less), coarse aggregate (0.25 % or less) • 0.08 mm sieve amount: fine aggregate (3.0 % or less), crushed sand (7.0 % or less), coarse aggregate (1.0 % or less) |
| Mixed Material | • Cement substitute used to improve performance of concrete • Expander, fly ash, blast furnace slag powder, silica fume, anhydrous gypsum, etc. ※ Upon using concrete admixture (mixed material, admixture), the approval of the purchaser is necessary. |
| Admixture | • The additive that improves the properties of concrete by surfactant action. • AE agent, water reducing agent (standard type, delaying type, accelerating type), AE water reducing agent (standard type, delaying type, accelerating type) • High performance AE water reducing agent (standard type, delaying type) |
Quality
1. Strength, slump, and air volume At the point of discharge, the following conditions must be met.
- If the purchaser specified the days, follow it. If not, it should be 28 days
- The result of one test shall not be less than 85% of the nominal strength value specified by the purchaser.
- The average value of the three test results shall be not less than the value of the nominal strength specified by the purchaser.
(Unit : mm)
| Slump | Slump Tolerance |
|---|---|
| 25 | ±10 |
| 50 and 65 | ±15 |
| More than 80 | ±25 |
(Unit : mm)
| Slump Flow |
Slump Tolerance |
|---|---|
| 500 | ±75 |
| 600 | ±100 |
| 700 | ±100 |
(Unit : %)
| Concrete Type |
Air Volume | Air Volume Tolerance |
|---|---|---|
| Concrete | 4.5 | ±1.5 |
| Lightweight Concrete | 5.5 | |
| Packed Concrete | 4.5 | |
| High Strength Concrete | 3.5 |
2. Chloride Content At the point of discharge, the chloride ion (Cl -) content should not exceed 0.30 ㎏/㎥.
However, upon approval of the purchaser, it can be reduced to 0.60 ㎏/㎥ or less.
3. Item Slump Flow 700 is applied only when the maximum size of coarse aggregate is 15 mm.
Notes on Ordering Ready Mixed Concrete
Ready Mixed Concrete Formula
Mortar
Characteristics of Mortar
- Crack reduction performance : Manufacturing with accurate design ratio
- Achieve superior quality : Quality control by factory production
- Excellent work performance :Excellent pumping performance and flat performance
- Excellent finish performance : Excellent surface finish texture and flatness
- Excellent manageability of construction : Silo installation in a construction site is unnecessary
- Economic Cost : Reduce material cost and construction management cost
Fiber Reinforced Concrete
Fiber Reinforced Concrete
- Dispersing fiber in plain concrete
- Stereoscopic reinforcement suppresses crack generation
- Using cellulose fiber (Ultra Fiber-500)
- Crack can be reduced by replacing wire-mesh
Fiber Reinforced Concrete
Good Finishing Performance of Concrete Surface
Natural wood fiber creates good dispersibility.
No surface exposure and no fiber-balling phenomenon
Excellent Crack reduction performance
Cost reduction and good workability,
replacing Wire-Mesh
Excellent economical efficiency and construction
Three-dimensional reinforcement on shrink tensile stress and
hydration reaction control ability from water retention of wood fiber
Various Applications
Various kinds of plain concrete
(Underground parking lot floor finish, waterproof layer pressing, etc.)
Decoration concrete, color concrete, etc.
Comparison of Characteristics of Fiber Reinforced Concrete
| Category | Wire-Mesh Concrete | Fiber Reinforced Concrete |
|---|---|---|
| Size | Wire-Mesh ( #8-@ 150 *150 ) | Cellulose Fiber 0.30㎏/㎥ |
| Reinforcement Type | Planar reinforcement crack control ability is insufficient | Three-dimensional reinforcement is sure to reduce cracks |
| Material Property | Metal | Hydrophilic wood fiber |
| Chemical Resistance | Poor acid resistance – corrosion | Good acid resistance and alkali resistance |
| Water Resistance | Defective – corrosion phenomenon | Good |
| Strength and Weakness | • On-site transportation and installation are difficult • Management of yard space and corrosion are necessary • It is difficult to maintain uniform coating thickness • Watertight can be easily torn during installation • Crack inhibition ability is not effective |
• Excellent workability (concrete factory mix) • Reduce construction period and cost • Excellent finish performance • Excellent crack reduction performance |
Exposure Concrete
Exposure Concrete
Exposed concrete is a construction that includes finishing work as well as frame construction.
The concrete should be good in workability, and the material separation of the aggregate, the pavement, and the cold joint should not occur.
The natural color of the concrete should be maintained or the color of the color concrete should be maintained.
Characteristics of Exposed concrete
Reduce Construction Period by Concurrent Work of Construction
Finishing process after concrete pouring is unnecessary.
A Variety of Colors
You can produce colorful concrete
by adding colors to concrete.
Skip painting work
The natural color of the concrete remains intact, pure, and natural.
The surface is smooth like being coated, so no painting is necessary.
Comprehensive Coverage
It can be applied to a variety of areas.
High Strength Concrete
Concrete with tensile strength of 40 Mpa or higher is called high-strength concrete. It is possible to secure the safety of the structure and reduce the construction cost,
because it has high durability, maintenance cost is reduced, and economical efficiency is high. Therefore, it is widely used for compression member of structures,
and also in bridges, PC beams, etc.
Low Heat Concrete
It is the concrete that minimizes the temperature, crack and stress caused by hydration heat of cement by lowering the heat of hydration of cement carcass or mixing technology of mineral admixture. It is mainly applied to super huge structures such as underground structures, dams, marine, and port structures.
User Demand Combination
Depending on the situation of the construction site, the product can be delivered at the ratio required by the contractor.
After receiving a field formulation design table, the design is applied to the product, which in turn is quickly delivered.
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