An Expeimental Study on Micro Silica Concrete

An Expeimental Study on Micro Silica Concrete

Mr.SANJAYGANDHIa MOHAMMED ISHAN KVb MURALI PRASATH Pb VASANKUMAR Rb VIJITHA Pb

aAssistant professor, Department of Civil Engineering,

Shree Venkateshwara Hi-Tech Engineering College, Gobichettipalayam, Erode-638455, Tamilnadu, India.

bFinal Civil, BE Civil Engineering, Department of Civil Engineering, Shree Venkateshwara Hi-Tech Engineering College, Gobichettipalayam, Erode-638455, Tamilnadu, India.

ABSTRACT

SCOPE

The scope of this project is consumption of cement can be reduced significantly without compromising performance characteristics of concrete including durability. The scope of study is to establish the objectives and this project will be mainly concentrated on experimental works.

ADVANTAGES

Micro silica is often a by product of silicon metal or ferrosilicon alloy production processes, making it a sustainable material choice for concrete production. It reduces the permeability of concrete to chloride and water intrusion considerably. Additionally, the enhanced durability and reduced maintenance requirements of structures built with micro silica can result in long-term cost savings. It increases the value of modulus of elasticity.

METHODOLOGY

• Title Selection
• Literature Review
• Materials Collection
• Materials Testing
• Mix Design
• Replacement of Fine Aggregate with Micro Silica
• Curing of Specimen
• Testing of Specimen
• Result
• Conclusion

MATERIALS CHARACTERISTICS

Cement – Cement is a fine, soft powder used as a binder because it hardens after contact with water. It is produced from a mixture of limestone and clay. OPC cement are using 53 grade cement for concrete.

M Sand – The full form of M sand is Manufactured Sand. This is an artificial type of sand formed by crushing rocks or granite. It is used as a substitute of river sand. M-sand can be used for construction of walls with a cement to sand ratio of 1:3.

Coarse aggregate – Coarse aggregates are a construction component made of rock quarried from ground deposits. The usual range employed is between

9.5mm and 37.5mm in diameter Typically the most common size of aggregate used in construction is 20mm.

MICRO SILICA – Micro Silica is an ultrafine material with spherical particles less than 1m in diameter, the average being about 0.15m. This makes it approximately 100 times smaller than the average cement particle.

Fig.1 MICRO SILICA

CopperMineral additions which are also known as mineral admixtures have been used in Portland cement for many years. There are two types of additions which are commonly mixed into the Portland clinker or blended directly with cement these days. They are crystalline, also known as hydraulically inactive additions and pozzolanic, which are hydraulically active additions.

Water – Water is the key ingredient, which when mixed with cement, forms a paste that binds the aggregate together. The water causes the hardening of concrete through a process called hydration.

2.LITERATURE REVIEW

Amudhavalli& Mathew (2012) studied the Effect of silica fume on the strength and durability characteristics of concrete.The main parameter investigated in this study is M35 grade concrete with partial replacement of cement by silica fume by 0, 5, 10,15and by 20%. a detailed experimental study in Compressive strength, split tensile strength, flexural strength at age of 7 and28 day was carried out.Results Shows that Silica fume in concrete has improved the performance of concrete in strength as well as in durability aspect. [1]

Shanmugapriya &Uma (2013) Experimental Investigation on Silica Fume as a partial Replacement of Cement in High Performance Concrete.The concrete used in this investigation was proportioned to target a mean strength of 60 MPa and designed as per A The water cement ratio (W/C) adopted was 0.32 and the Super Plasticizer used was CONPLAST SP 430.Specimens such as cubes, beams and cylinders were cast for various mix proportions and tested at the age of 7,14and 28 days CI 211.4R-08.The investigation revealed that the partial replacement of cement by silica fume will develop sufficient compressive strength, flexure strength and split tensile strength for construction purposes. The optimum dosage of silica fume found to be 7.5% (by weight), when used as partia replacement of ordinary Portland cement. [6]

replacement of cement by micro silica is more than normal concrete. The optimum cement replacement percentage by micro silica varies from 10% to 15 %.

Perumal& Sundararajan (2004) Observe the Effect of partial replacement of cement with silica fume on the strength and durability properties of high grade Concrete.Strength and durability properties for M60, M70 and M11 0 grades of HPC trial mixes and to arrive at the maximum levels of replacement of cement with Silica fume, investigations were taken.The strength and durability characteristics of these mixes are compared with the mixes without SF. Compressive strengths of 60 N/mm2, 70 N/mm2 and 110 N/mm2 at 28days were obtained by using 10 percent replacement of cement

Hanumesh, Varun and Harish (2015) In this study it is observed the mechanical properties of concrete when partial replacement of cement is done with micro silica. The main aim of this work is to study mechanical properties of M20 grade concrete when cement is replaced with silica fume at different percentages (5,10,15 and 20). The results showed that strength of concrete is increased when 10% replacement of cement is done with micro silica. Above 10% replacement of cement with silica fume it is observed that there is decrease in compressive strength. Hence, optimum percentage of replacement of cement by silica fume is 10% for M20 grade of concrete., Vimala, studied the compressive strength increased with increase in copper slag content up to a replacement level of 10%. Beyond the replacement level of 15% of sand with copper slag in concrete, a decrease in strength was observed. Hence addition of copper slag increased self weight of concrete.

Amarkhail (2015) observed Effects of Silica Fume on Properties of High-Strength Concrete. He found that up to 10% cement may be replaced by silica fume without harming the concrete workability. Concrete containing 10% silica fume replacement achieved the highest compressive strength followed by 15% silica fume replacement with a small difference. Concrete with 15% silica fume content achieved the highest flexural strength.10% and 15% silica fume content as replacement of cement were found to be the optimum amount for significantly enhancement of compressive strength and flexural strength respectively. [10]

Ghutke and Bhandari (2014)The influence of micro silica on concrete was examined in this study. The result showed that micro silica is a good for partial replacement of cement. The strength was increased when cement was replaced with micro silica. Concrete reduces its workability as percentage of micro silica is increased. The optimum compressive strength can be obtained in 10% replacement of micro silica. As strength of 15%

with SF. The results also show that the SF concretes possess superior durability properties. [2]..

CHARACTERISTICS OF MATERIALS

Cement

M Sand

Coarse aggregate

MICRO SILICA

Micro silica is a Portland cement inchange of fine aggregate replacement it should be finding the increase in strength.

TESTING SPLIT TENSILE STRENGTH FOR MICRO SILICA

COMPRESSIVE STRENGTH FOR COPPER SLAG Split tensile strength of cylinder for 7 days Compressive strength after 7 days for cube

Split tensile strength of cylinder for 28 days

Compressive strength after 28 days for cube

RESULT

Chart Title

25

20

15

10

5

0

19.44

16.93

18.25

14.22

0% 10% 20% 30%

Series 1

Compressive strength after 7 days for concrete

Chart Title

40

32.05

35.8

25.65

30.7

20

0

0%

5%

10%

15%

Series 1

Compressive strength after 28 days for concrete

SPLIT TENSILE STRENGTH FOR MICRO

Chart Title

4

2.61

2.91

2.15

<p1.96

2

0

0%

10%

15%

30%

Series 1 Column2 Column1

SILICA Split tensile strength of cylinder for 7 days

4

3.5

3

Chart Title

3.76

3.41

3.54

3.17

2.5

0%

10%

15%

30%

Series 1 Column2 Column1

Split tensile strength of cylinder for 24 days

CONCLUSION

In this project, an experimental study has been conducted on concrete by varying the percentage of copper slag as 0%, 5%, 15% and 20% respectively to study the increase in the compressive strength of concrete.

COMPRESSIVE STRENGTH

After adding 5% silica fume in the mix, there is an increase in thestrength of cube after 7 days.As compared to concrete without replacement after 28 days there is enormous

increase in strength as compared to the control mix.By adding 10% micro silica, there is large amount of increase in strength after 7 and 28 days respectively. The Compressive strength tends to increase with increase percentages of silica fume in the mix and decreases after 10% replacement.The optimum strength of cube is gain at 10% replacement for all 7, 14 and 28 days respectively.

SPLIT TENSILE STRENGTH

After adding 5% silica fume in the mix, there is an increase in the strength of cylinder after 7 days as compared to concrete without replacement and after 28 days there is enormous increase in strength as compared to the control mix. The optimum strength of cylinder is gain at 20% replacement for all 7 and 28 days respectively. By adding 10% silica fume, there is large amount of increase in strength after 7 and 28 days respectively. The split tensile strength tends to increase with increase percentages of silica fume in the mix and decreases after 10% replacement.

REFERENCE

1. Aditya Dhagat, Manav Mittal (august 2013) Effect of Micro silica and Fly ash on the Strength of Concrete.
2. Ajay, G., Anwar, A. M., Hattori, K., and Ogata, H., 2007. Properties of sugarcane bagasse ash and its potential as cement-pozzolana binder. Department of Environmental Engineering, United Graduate School of Agricultural Sciences, Tottori University, Japan.
3. Ajileye, E.V. (2012). Investigations on Micro silica (Silica Fume) As Partial Cement Replacement in Concrete. Global Journal of Researches in Engineering Civil and Structural engineering 12 (1), 17-23
4. Amudhavalli, N. K. & Mathew, J. (2012). Effect of silica fume on strength and durability

   parameters of concrete. International Journal of Engineering Sciences & Emerging Technologies. 3 (1), 28-35

5. Concrete technology theory and practice, M.S. Shetty , S. chand publication, revised edition 2008.
6. Experimental Investigations of Mechanical properties on Micro silica (Silica Fume) and Fly Ash as Partial Cement Replacement of High Performance Concrete. Magudeaswaran, eswaramoorthy
7. Ghutke, V. S. & Bhandari, P.S. (2014). Influence of silica fume on concrete. IOSR Journal of Mechanical and Civil Engineering, 44-47.IS 456 2000 : plain and reinforced concrete code of practice. Bureau of Indian standard (second Revision)
8. Jatinkumar B. Patel, Akshayakumar Hirapura, Brijesh Ramani, Kaushal Karthikeya, Use of Micro silica in

   concrete.” International Journal of Innovative Research in Science & technology, Volume 2,(2012). ISSN:2231-6604

9. Kumar, A., Jain, S., Gupta, S., Sonaram&Merawat,

S. (2015). A Research Paper on Partial Replacement of Cement in M-30 Concrete from Silica Fume and Fly Ash. SSRG International Journal of Civil Engineering, 3(5), 40-45