Tr 00083

IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

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International e-Journal For Technology And Research-2017

Study Of Mechanical Properties Of High Strength Concrete By Partial Replacement Of Cement With Fly Ash And In Corporating Of Fibers V.Sowmya1,K.Srinivasa Rao2 1

U.G Student,2Asst. Professor,

, Department of Civil Engineering,

Sir C R R College of Engineering, Eluru,India

Abstract:

Concrete is considered as durable and strong material. Concrete is one of the most popular material used for constructions. The present investigation deals with High strength concrete of M60 by adding fiber material to strengthen the concrete. Partial replacement of OPC with fly ash in percentages of 0%, 5% and10% in various ratios and also add Masterpel777, super plastisizer for workability purpose. Exposure periods of 7, 14 and 28 days on various tests. In this project we have designed M60 grade concrete using Design mix of Department of Environment method of various strengths.

Keywords: High strength concrete, Fly ash, Super plastisizer, Fibre, Masterpel777, DOE Method.

1. INTRODUCTION In our country concrete industry plays a major role for development of nation, government spend a huge amount for building the nation like bridges, buildings and dams etc. Cement is strong binding material, coarse aggregate gives strength, fine aggregates are used as void filler and water gives the strong bond between the three ingredients. Usually hard broken granite (HBG) is used as coarse aggregate and well graded sand is used as fine aggregate. Water is reacts

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with cement and the chemical reaction is started called hydration which gives the strength to the concrete.

In the case of larger structures different types of mixes are used in concrete like M20, M40, and M60 etc. if the strength is up to 40N/mm² is allowed to be a conventional concrete, but if the strength is above 40N/mm² it is treated as High strength Concrete (HSC). HSC is used widely in larger industry projects like Polavaram project (A.P) for bearing high pressures. In order to develop High strength concrete we may use lower water powder (cement) binding ratio and chemical admixtures which results better workability.

High strength concrete is very costly, but it is used in civil industry by replacing different waste materials like fly ash, plastic, GGBS, E-Waste, fibers results to decrease the effective cost. In this graduation project replacing the cement by fly ash and felt fibers in concrete with various percentages. We successfully performed different experimental investigation tests for finding the mechanical properties of concrete of high strength grade M60. The super plasticizer used in this investigation is Masterpel-777.

2. RESEARCH SIGNIFICANSE 1.

To study the optimum percentage composition of fly ash replacing cement which does not affect the Copyright@IDL-2017

IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

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International e-Journal For Technology And Research-2017 concrete strength.

8. Glass fiber To determine the compressive strength, flexural 9. Synthetic fiber strength, split tensile strength of concrete with Steel fibers are defined as short, discrete length of steel cement replaced by different percentages of fly ash.

3. To study the durability aspects of concrete. having aspect ratio from 20 to 100 with any cross section.

Aspect ratio means ratio of length to diameter. We are taking aspect ratio 40 in this project.

FLYASH: In this project we use the steel fiber for increasing the Fly ash is the byproduct of the combustion of coal in strength of concrete. Steel fibers are added to concrete to electric power generation plants and also the burning of improve the structural properties like tensile and flexural plants etc. Fly ash includes major components of silicon strength. The steel fiber increases the flexural strength up to dioxide, aluminum oxide, calcium oxide etc. in different 25% to 100% depending upon proportion of fiber added. proportions, due to these chemical properties fly ash is used as replacement of cement and increases the strength of MASTER PEL 777 SUPERPLASTIZER: concrete and decreases the cost. If we increase the fly ash content in concrete beyond the limits then strength of Masterpel is a specially blended admixture that is used to produce water resistant and efflorescence controlled concrete concrete is decreases. mortar. The liquid super plasticizer or admixture is designed Fly ash can be classified into two types based on to increase the workability of concrete and also decreases the chemical properties and source. water content.

2.

4.

Class C It contains more than 10% of calcium oxide and it also possess both pozzolanic and cementious properties. It is produced by burning of lignite or sub bituminous coal.

5.

Class F

MasterPel 777 is compatible with most admixtures, corrosion inhibitors and shrinkage reducers used in the production of quality concrete including normal, other mid-range and highrange water reducing admixtures, accelerators, retarders. The Masterpel 777 admixture is used for both water proofing and plasticizing effect for cemenconcrete, mortar and plaster etc.

It contains less than 5% calcium oxide content It is also used in all types of concrete and mortar used in and it posses’ pozzolanic properties but needs additive construction of residential and commercial buildings etc. It is for showing the properties. It is normally produced by also used in the construction of seawalls, tunnels, basements, burning anthracite or bituminous coal. structural and pre-cast concrete.

FIBER:

3.

TESTS ON MATERIALS

Fiber is a natural or synthetic substance .It is used in MATERIALS: the manufacture of other materials. Synthetic fibers can often be produced very cheaply and in large amounts compared to The various materials used in the concrete mix proportion is natural fibers. explained as follows Fibers can be classified as four types based physical Cement: properties.

Cement is used as binding material which can hold the both 6. Steel fiber sand and aggregates together. Cement Grades are classified 7. Natural fiber according to average compressive strength. They are as

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IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

Available at: www.dbpublications.org

International e-Journal For Technology And Research-2017 follows 33, 43 and 53 Grade.

Test conducted on FA& CA

Results

33 Grade cement is used in general construction like plastering, finishing works etc, where high strength is not required.

Fineness modulus of FA

3.36

Specific gravity of sand

2.69

43 Grade cement is used for structural works, pre cast works etc, strength development is faster than 33 Grade.

Bulking of sand

4%

Zone of Sand

III as per IS:383-1970

Fineness modulus of CA

7.21

Specific gravity of CA

2.7

53 Grade cement is used for construction of multi storey structures, pre cast pre stressed items, bridge, tall structures.

It develops very fast strength and speed up the construction.

In this project we can take the OPC of 53 Grade cement only. The cement is nothing but composition of different ingredients like silicates, aluminates, limestone and clay in different percentage.

WATER For proper chemical action, the amount of water required is about 25% of the weight of cement used; however, more water is used for proper workability of concrete. The water used for both mixing and curing should be free from injurious amount of oils, acids, alkalis, salts, organic materials or other substances that may be harmful to concrete. Portable water is considered to be satisfactory for mixing concrete. The water is tested in accordance with IS: 3025 – 1984.

TESTS ON CEMENT

The following tests are performing to cement to known the The w/c ratio is the one of important factor to determine the properties. strength of concrete. A lower w/c ratio will yield stronger concrete, but difficult to work. A higher w/c ratio yields lower strength concrete. Cement paste is the material formed by combination of water and cementations materials. Water Test conducted Results is used for mixing of concrete ingredients should be free from impurities.

Fineness of cement 5% Normal consistency

32%

Initial setting time

46min

Final setting time

570 min

Specific gravity

3.12

According to IS 456 – 2000, the pH value of the water shall not be less than 6.

In the Present study,The pH value of water used in the concrete mix is 7.5 3.

EXPERIMENTAL INVESTIGATION

COMPRESSIVE STRENGTH OF CUBES: AGGREGATES IDL - International Digital Library

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IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

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International e-Journal For Technology And Research-2017 Compressive strength of cubes at the rate of 7, 14, 28 days at different fly ash percentages 0%,5%&10%.

200 150 28 days

100

14 days 50

7days

0 0%

5%

10%

Split tensile strength of cylinders of various % of Flexural strength of beams of various % of replacement of replacement of cement by fly ash when immersed in water cement by fly ash when immersed in water SPLIT TENSILE STRENGTH OF CYLINDER:

FLEXURAL STRENGTH OF BEAMS:

Split tensile strength of cylinders at the rate of 7, 14, 28 days Flexural strength of beams at the rate of 7, 14, 28 days at different percentages of fly ash 0%, 5% & 10%.

28 days

28 days 3.5 3 28 days

2.5 2 0%

5%

4.7 4.6 4.5 4.4 4.3

28 days

0%

10%

5%

10%

at different fly ash percentages 0%, 5%&10%.

CONCLUSIONS Compressive strength of cylinders of various % of replacement of cement by fly ash when immersed in water

1.

COMPRESSIVE STRENGTH OF CYLINDERS: Compressive strength of cylinders at the rate of 7, 14, 28 days at different fly ash percentages 0%, 5%, &10%.

2.

3.

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The performance was observed with addition of super plasticizer Masterpel – 777 added for richer mixes workability of the concrete maintain uniformly.

When the grade of concrete is increased size of the aggregates is reduced. With the help of different trail mixes well suitable aggregate is graded aggregate like 10-20mm.

Micro cracks appear, sudden failure observed in high strength concrete cubes. In split tensile test the cracks are longitudinally occurred.

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International e-Journal For Technology And Research-2017 4.

5.

6.

7.

8.

As per the experimental investigation successfully found when the fiber is used within the permissible limit 0.1-3%. The target strength of concrete is reached at 10% fly ash, in addition to get good improvement in workability.

As per Mix Design, Maximum compressive strength of standard concrete cube is achieved 61.52N/mm² for M60 grade of concrete in 28 days with water cement ratio 0.32.

Maximum split tensile strength is 3.04 N/mm² is attained in 10% of replacement of fly ash. It is increased as compare to 5% of replacement of fly ash at the age of 28 days. As per Is 456-2000 Split tensile strength of concrete not so good comparison with the code. Investigation of this result one of the uncertainty in high strength concrete.

Flexural strength of concrete is 4.65 N/mm² at the age of 28 days but it does not reach the required strength. So, in high strength concrete the flexural strength achieved by addition of fiber in maximum limit.

Maximum compressive strength of cylinders is 35.86 N/mm² is attains at 10% of replacement of fly ash and felts the 0.5% fibers at the age of 28 days, but this not a good result as per code provisions.

[2]. H.M.Somasekharaiah, “A study on fiber reinforced high performance concrete using multiple mineral admixtures”, International Journal of Research in Engineering and Technology (IJRET), e-ISSN: 2319-1163, p-ISSN: 23217308.

[3]. A.M. Shende, “Experimental Study on Steel Fiber Reinforced

Concrete

M-40 Grade”,

for

International

Refereed Journal of Engineering and Science (IRJES), ISSN (Online) 2319-183X,(Print) 2319-1821 Volume 1, Issue 1 (September 2012), PP< 043-048. Dayalan J, [4].

Mohammad

Rashid,

Abdur

“Considerations

in

producing high strength concrete”, journal of civil Engineering (IEB), 37 (1) (2009) 53-63.

[5]. P.Vinayagam, “Experimental Investigation on High Performance Concrete using Silica Fume and super plasticizer”,

International

journal

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computer

and

communication engineering, vol.1, No.2, July 2012.

FUTURE SCOPE OF WORK 1. To attain high strength concrete by using different type of cements with felt fibers.

[6]. Ankitkumar, “Effect of silica fume and Fly ash as partial replacement of cement on strength of concrete”, International Journal of Innovative Research in science,

2. This project may be extended by replacing of different super plasticizers with fiber to attain desired results.

Engineering and Technology. (An ISO 3297:2007 certified organization) vol.5, Issue 10, October 2016.

3. To attain high strength concrete by using different types of pozzolanic materials.

4. Comparing different aspect ratios of fibers felt in concrete to gain required strength.

[7]. NileshR.Parmar, “High strength concrete with pond-ash as partially Replaced by Fine aggregate and fine Fly ash, Alccofine as Cement”, GRD Journals Recent Advances in Civil Engineering for Global sustainability/March 2016,

REFERENCES

e:ISSN:2455-5703.

[1]. HimabindhuMyadaraboina, “Development of high volume fly ash concrete using ultra fine fly ash”, 23rd

[8]. Siddamreddy Anil kumar Reddy, “Effect of fly ash on

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value

IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

Available at: www.dbpublications.org

International e-Journal For Technology And Research-2017 (2013):6:14/Impact factor (2013):4.438.

[9]. AmanJatale, “Effect on compressive strength when cement is partially replaced by fly ash”, IOSR Journal of Mechanical and Civil Engineer (IOSR-JMCE). E-ISSN: 2278-1684 volumes, Issue 4 (Jan-Feb. 2013), PP34-43.

[10]. A study on strength characteristics of glass fiber reinforced

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Research Journal of Engineering and Technology (IRJET) volume: 04 Issue: 02| Feb-2017 e-ISSN: 2395-0056, p-ISSN: 2395-0072

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