Profile Silicafume Cty Sông Thao.pdf

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Công ty Cổ phần Xây dựng và vận tải Sông Thao Nhà cung cấp phụ gia khoáng hoạt tính silica fume, microsilica uy tín tại Việt Nam. Các đơn vị sử dụng silica fume tại Việt Nam là: bê tông siêu tính năng UHPC, bê tông và vữa chịu lửa, bê tông & vữa bền sulfat, bê tông & vữa chống thấm...

Data & Analytics

SILICA FUME 3
2、Product Introduction & Application

4
Production Base
SILICA FUME
1. Color: From light gray to dark gray
2. Density: Undensified bulk density 300 – 350 kg/ m3
Densified bulk density 650 – 700 kg/ m3
3. SiO₂ Content: 85% – 97%
4. Median Particle Size: About 150 nm
5. Specific Surface Area: 15.000 – 35.000 m2/ kg
Physical Properties of Silica Fume

6
Product Introduction
SILICA FUME
Chemical Properties of Silica Fume
Silica fume, also known as microsilica, (CAS number 69012- 64-2,
EINECS number 273-761-1) is an amorphous (noncrystalline)
polymorph of amorphous silicon dioxide.
It is an ultrafine powder collected as a by-product of the silicon
and ferrosilicon alloy production and consists of spherical
particles with an average particle diameter of 150 nm.
The main field of application is as pozzolanic material for high
performance concrete.

7
Product Introduction
SILICA FUME
Index
SiO₂ ≥ 85%
Loss on Ignition ≤ 6%
H2O * ≤ 2%
Bulk density ≥ 18 m2/g
Technical data sheet

8
Function and application mechanism of Silica fume
SILICA FUME
Mechanism of Silica Fume in Concrete
Physical Function
Chemical Reaction
Silica fume can improve the water-repellent and cohesiveness of fresh
concrete and improve the quality of concrete.
1、 Fill the pores between the cement particles to make the slurry denser
2、 Improve the microstructure of cement and aggregates
3、 Improve macro-physical-mechanical properties of concrete materials,
including strength, impermeability, durability, elastic modulus, etc.
1、 Silica reacts with Ca(OH)2 precipitated by cement hydration to form
hydrous calcium silicate (CHS) gel, blocking the capillaries, making the
pores smaller and discontinuous, improving concrete compactness
2、 Silica reacts with Ca(OH)2 precipitated by cement hydration to form
hydrous calcium silicate (CHS) gel, blocking the capillaries, making the
pores smaller and discontinuous, improving concrete compactness
3、 Improve cement C/S ratio
4、 High pozzolanic activity

9
Application of Silica fume
SILICA FUME
Shotcrete Reactive Powder Concrete Slab of High-Speed Train
Marine Concrete
Nuclear radiation
protection concrete
Impact-resistant and
wearresistant concrete

10
SILICA FUME
3、Production·Marketing·Research & Development

11
SILICA FUME
We adhere to high standards of Silica Fume production management
Warehouse
Manufacture
STANDARDS
Vietnam: TCVN 8827:2011
America: ASTM C1240-04
Chinese: GB/T 18736-2002

$12 SILICA FUME Provide All-In-One Solutions of Silica Fume for Customers " Silica Fume" is widely used in concrete, refractory materials, new building materials, oil wells, insulation, ceramics, rubber, fertilizer and other fields SONG THAO TRANSPORTATION AND CONSTRUCTION., JSC 389 Nguyen Khoai Street, Thanh Tri Ward, Hoang Mai District, Hanoi City, Vietnam. Tell: (+84) 0906262100 E-mail: sillicafumevietnam@gmail.com Website: www.songthao.com.vn$

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Abstract The replacement of sand/cement by certain percentage of silica fumes, resulted in the improvement in compressive strength of the mortar. Silica fumes to the highly pozzolanic materials because it consists essentially of silica in noncrystalline form with a high specific surface. It is used to improve the mechanical properties of the concrete. The main objective of this paper is to study the effect of silica fume on the compressive strength of mortar. Three proportions of mixes viz mix 1:3, mix 1:4 and mix 1:6 with different percentages of silica fumes replacement with sand/cement were used. The maximum increase in strength at the age of 28 days when sand is replaced by 15% of silica fume has been observed as 40% and in case of cement replaced with 15% of silica fume, the observed increase in compressive strength of mortar comes out to be 28%. A quantitative cost analysis shows that with the replacement of cement and sand by silica fume, the in cost is more when sand is replaced and it is less when cement is replaced. Keywords: pozzolanic, silica fumes, noncrystalline, compressive strength

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One of the approaches in improving the durability of concrete is to use blended cement materials such as fly ash, silica fume, slag and more recently, metakaolin.. This study presents the results of different mechanical properties of concrete such as compressive strength, split tensile strength and flexural concrete by partially replacing cement with metakaolin and silica fume. The replacement of metakaolin is varied from 10%, 15%, 20% and 25% and silica fume from 6%, 8% and 10%. The property of concrete in fresh state, that is the workability is also studied during the present investigation.The optimum doses of silica fume and metakaolin in combination were found to be 6% and 15% (by weight) respectively, when used as part replacement of ordinary Portland cement.

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In coal power generation, fly ash is produced as a by-product. In power plant the dust-collection system removes the fly ash, as a fine particulate residue. Fly ash particles are typically spherical, ranging in diameter from <1 µm up to 150 µm. Over the past decade, the use of fly ash in construction industry has been successfully archived. In Sri Lanka, major proportion of the power demand was met using hydropower in the twentieth century. There is one coal power plant in operation now at Nuraichcholai and plans are there to have another one at Sampoor, Trincomalee in the near future. As this is a new approach for power generation in Sri Lanka, there are considerable efforts to dump the generated fly ash in construction projects. To dispose this waste material in a sustainable way, research is needed to identify possible usage in the construction industry of our country. The use of fly ash in concrete improves its workability, reduces segregation, bleeding, heat evolution and permeability, inhibits alkali-aggregate reaction, and enhances sulphate resistance. Presently a few companies are involved in using fly ash in their batching plants to manufacture concrete in Sri Lanka. Also there are several other firms, which have tried to use fly ash for applications and failed. For example use of fly ash in manufacturing hume pipes, paving blocks etc have failed due to delay in strength gaining.

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Abstract The effect of corrosion inhibiting admixture on concrete and mortar properties is investigated experimentally. Two reference concretes and mortars are considered, based on ordinary Portland cement (OPC) and slag cement. The effect of corrosion inhibiting admixture (a sodium nitrite-based inhibitor) is evaluated. The properties of the fresh concrete (setting time, density and workability) and of the hardened concrete (compressive strength, bending tensile strength and splitting tensile strength) are evaluated. From experimental results, it has been observed that addition of sodium nitrite as corrosion inhibitor (CI) decreases the compressive strength of OPC mortar at all ages i.e. 7 and 28 days, while an increasing trend is observed for addition of CI in slag cement mortars. There is no remarkable change in density observed for addition of CI for both types of mortars made with OPC and slag cement. 7 days compressive strength decreases with addition of CI to concrete cube made with OPC, while an increasing trend is observed for concrete made with slag cement. 28 days compressive strength of concrete cubes made with both type of cements decreases with addition of CI. Further addition of silica fume (10%) with combination of CI improves the compressive strength. Index Terms: corrosion inhibitor, silica fume, ordinary Portland cement, slag cement,

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The environment in some concrete structures can become very acidic due to formation of sulphuric acid converted from hydrogen sulphide by bacterial action. Significant deteriation of concrete in such harsh environments has been reported world wide. Deteriotation of sewer system may result in serious problem such as the loss of ability to transport sewerage, contamaniation of ground and ground water, excessive ground settelements.

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Admixtures are added in concrete to improve the quality of concrete. Fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), Metakaolin (MK), and rice husk ash (RHA) Possess certain characteristics through which they influence the properties of concrete differently. Effect of mineral admixtures on the properties of fresh concrete is very important as these properties may affect the durability and mechanical properties of concrete.

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Microsilica is a byproduct from silicon metal or ferrosilicon industries, where these metals are produced in submerged electric arc furnaces. As the molten metal is produced, a silica-based gas is emitted. This gaseous fume, as it rises, cools rapidly and forms extremely minute, amorphous, spherical particles. The microsilica fume is collected in a bag house, a system for filtering the hot air and gases vented from the furnace. Microsilica in concrete: When it is used in concrete, it acts as a filler and as a cementitious material. The small micro silica particles fill spaces between cement particles and between the cement past matrix and aggregate particles. Microsilica fume also combines with calcium hydroxide to form additional calcium hydrate through the pozzolanic reaction. Both of these actions result in a denser, stronger and less permeable material. Microsilica has been used as an addition to concrete up to 15 percent by weight of cement, although the normal proportion is 7 to 10 percent. With an addition of 15 percent, the potential exists for very strong, brittle concrete. It increases the water demand in a concrete mix; however, dosage rates of less than 5 percent will not typically require a water reducer. High replacement rates will require the use of a high range water reducer. How do micro silica work in concrete? Microsilica improves concrete through two primary mechanisms — the basic pozzolanic reaction, and microfiller effect. When water is added to portland cement hydration occurs forming two products, as shown below: Cement +Water----------->Calcium Silicate Hydrate +Calcium Hydroxide

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ndustrial byproducts such as Silica Fume (SF) and Fly Ash (FA) can be utilized to enhance the strength and water permeability characteristics of High Performance Concrete (HPC). The utilization of these industrial by products is becoming popular throughout the world because of the minimization of their potential hazardous effects on environment. This paper investigates the individual effects of Silica Fume and Fly Ash as a partial replacement of Ordinary Portland Cement (OPC) on water permeability, compressive strength, split tensile strength and flexural tensile strength of High Performance Concrete (HPC). To investigate these properties of concrete, the total investigation was categorized into two basic test groups - SF Group for Silica Fume and FA Group for Fly Ash. Seven types of mix proportions were used to cast the test specimens for both groups. The replacement levels of OPC by Silica Fume were 0%, 2.5%, 5%, 7.5%, 10%, 15% and 20% where replacement levels of OPC by Fly Ash were 0%, 5%, 10%, 15%, 20%, 25% and 30%. 1% super-plasticizer was used in all the test specimens for high performance (i.e., high workability at lower water-binder ratio) and to identify the sharp effects of Silica Fume and Fly Ash on the properties of concrete. Water-binder ratio was kept 0.42 for all cases and the specimens were tested at ages of 7, 14 and 28 days.10% Silica Fume and 20% Fly Ash showed the lowest water penetration depth of 11mm and 15 mm respectively. 7.5% Silica Fume and 10% Fly Ash were found to be optimum for maximum compressive strength, maximum split tensile strength as well as maximum flexural tensile strength.

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Profile Silicafume Cty Sông Thao.pdf

1. SilicaFume Highly activity puzzolanic admixtures for concrete and mortar PHỤ GIA KHOÁNG HOẠT TÍNH CAO DÙNG CHO BÊ TÔNG VÀ VỮA - SILICAFUME 1 1、Product SilicaFume

2. 2 SILICA FUME Production Base

3. SILICA FUME 3 2、Product Introduction & Application

4. 4 Production Base SILICA FUME 1. Color: From light gray to dark gray 2. Density: Undensified bulk density 300 – 350 kg/ m3 Densified bulk density 650 – 700 kg/ m3 3. SiO₂ Content: 85% – 97% 4. Median Particle Size: About 150 nm 5. Specific Surface Area: 15.000 – 35.000 m2/ kg Physical Properties of Silica Fume

5. 5 Product Introduction SILICA FUME

6. 6 Product Introduction SILICA FUME Chemical Properties of Silica Fume Silica fume, also known as microsilica, (CAS number 69012- 64-2, EINECS number 273-761-1) is an amorphous (noncrystalline) polymorph of amorphous silicon dioxide. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm. The main field of application is as pozzolanic material for high performance concrete.

7. 7 Product Introduction SILICA FUME Index SiO₂ ≥ 85% Loss on Ignition ≤ 6% H2O * ≤ 2% Bulk density ≥ 18 m2/g Technical data sheet

8. 8 Function and application mechanism of Silica fume SILICA FUME Mechanism of Silica Fume in Concrete Physical Function Chemical Reaction Silica fume can improve the water-repellent and cohesiveness of fresh concrete and improve the quality of concrete. 1、 Fill the pores between the cement particles to make the slurry denser 2、 Improve the microstructure of cement and aggregates 3、 Improve macro-physical-mechanical properties of concrete materials, including strength, impermeability, durability, elastic modulus, etc. 1、 Silica reacts with Ca(OH)2 precipitated by cement hydration to form hydrous calcium silicate (CHS) gel, blocking the capillaries, making the pores smaller and discontinuous, improving concrete compactness 2、 Silica reacts with Ca(OH)2 precipitated by cement hydration to form hydrous calcium silicate (CHS) gel, blocking the capillaries, making the pores smaller and discontinuous, improving concrete compactness 3、 Improve cement C/S ratio 4、 High pozzolanic activity

9. 9 Application of Silica fume SILICA FUME Shotcrete Reactive Powder Concrete Slab of High-Speed Train Marine Concrete Nuclear radiation protection concrete Impact-resistant and wearresistant concrete

10. 10 SILICA FUME 3、Production·Marketing·Research & Development

11. 11 SILICA FUME We adhere to high standards of Silica Fume production management Warehouse Manufacture STANDARDS Vietnam: TCVN 8827:2011 America: ASTM C1240-04 Chinese: GB/T 18736-2002

12. 12 SILICA FUME Provide All-In-One Solutions of Silica Fume for Customers " Silica Fume" is widely used in concrete, refractory materials, new building materials, oil wells, insulation, ceramics, rubber, fertilizer and other fields SONG THAO TRANSPORTATION AND CONSTRUCTION., JSC 389 Nguyen Khoai Street, Thanh Tri Ward, Hoang Mai District, Hanoi City, Vietnam. Tell: (+84) 0906262100 E-mail: sillicafumevietnam@gmail.com Website: www.songthao.com.vn

Profile Silicafume Cty Sông Thao.pdf

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