Study on Properties of Concrete using Recron 3s Fiber

IJSTE - International Journal of Science Technology & Engineering | Volume 4 | Issue 3 | September 2017 ISSN (online): 2349-784X

Study on Properties of Concrete using Recron 3s Fiber Korrapati Anil Kumar M. Tech. Student Department of Civil Engineering Andhra University College of Engineering (A), Visakhapatnam, Andhra Pradesh, India

Dr. Shaik Yajdani Associate Professor Department of Civil Engineering Andhra University College of Engineering (A), Visakhapatnam, Andhra Pradesh, India

Ganta Shanmukha Rao M. Tech. Student Department of Civil Engineering Andhra University College of Engineering (A), Visakhapatnam, Andhra Pradesh, India

Abstract The aggregates both fine and coarse are bonded together by the cement and mixed with water to form concrete. The concrete has become so popular and indispensable because of its inherent in nature brought a revolution in applications of concrete. Concrete has unlimited opportunities for innovative applications, design and construction techniques. Its great versality and relative economy in filling wide range of needs has made it very competitive building material. In this present investigation workability, strength properties of concrete with Recron 3s fiber in proportions of 0%, 0.2%, 0.3% and 0.4% is studied for M25 and M40 grade concrete cubes, cylinders and prisms.Recron3s Fiber Reinforcement Systems can provide a solution to Recron 3s fibers are engineered micro fibers with a unique "triangular" cross-section, used in secondary reinforcement of concrete. It complements structural steel in enhancing concrete's resistance to shrinkage cracking and improves mechanical properties such as flexural/split tensile and transverse strengths of concrete along with the desired improvement in abrasion and impact strengths. The Recron Polyester fibers and Polypropylene fibers. The present investigation is to study the workability parameters of M25 and M40 grades of concrete using slump cone test, Compaction factor test, and Vee-bee time test. For strength parameters, each grade of concrete for each proportion, cubes, cylinders, prisms were casted for 7days, 28days, 56days and 91 days strength. Keywords: Recron 3s, Split Tensile Strength, Compressive Strength, Flexural Strength ________________________________________________________________________________________________________ I.

INTRODUCTION

Concrete is the most widely used construction material in the world, which commonly consists of cement, aggregates and water. It is the material, which is used more than any other man made material on the earth for construction works. Fiber-reinforced concrete (FRC) â&#x20AC;&#x153;It is the concrete containing fibrous material which increases its structural integrityâ&#x20AC;?. It contains short discrete fibers that are uniformly distributed and randomly oriented. Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers-each of which lend varying properties to the concrete. In addition, the character of fiber-reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities. We can use Fibers reinforced concrete to control cracking due to plastic shrinkage and to drying shrinkage. They also reduce the permeability of concrete and thus reduce bleeding of water. Some types of fibers produce greater impact-, abrasion-, and shatter-resistance in concrete. Generally fibers do not increase the flexural strength of concrete, and so cannot replace moment-resisting or structural steel reinforcement. Indeed, some fibers actually reduce the strength of concrete. An FRC sub-category named engineered cementations composite (ECC) claims 500 times more resistance to cracking and 40 percent lighter than traditional concrete ECC claims it can sustain strainhardening up to several percent strain, resulting in a material ductility of at least two orders of magnitude higher when compared to normal concrete or standard fiber-reinforced concrete. ECC also claims a unique cracking behavior. When loaded to beyond the elastic range, ECC maintains crack width to below 100Âľm, even when deformed to several percent tensile strains. Field results with ECC and the Michigan Department of Transportation resulted in early age cracking. Recent studies performed on a high-performance fiber-reinforced concrete in a bridge deck found that adding fibers provided residual strength and controlled cracking. There were fewer and narrower cracks in the FRC even though the FRC had more shrinkage than the control. Residual strength is directly proportional to the fiber content. Recron 3s is a state of art reinforcing material which is used to increase strength in a variety of applications like automotive battery, paper, filtration fabrics, and asbestos cement sheets, cement based pre-cast products and for improving quality of construction. A product of extensive R&D in Reliance industry limited (RIL) state-of-the-art Technology center.

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Recron 3s Fiber Reinforcement Systems can provide a Solution to most of these problems           

Split tensile strength was increased by 2.5 times of conventional concrete Flexural strength was increased by 2.5 times of conventional concrete Reduction in Intrinsic Plastic& Drying shrinkage cracking. It controls Plastic settlement. It Improves the Post peak Ductility of Concrete. Increases Wet & Dry abrasion resistance Increase Impact/ Shatter resistance Reduces water percolation& concrete permeability Increases Toughness of Hardened concrete It Reduces Damaging effects due to freeze thaw cycles It Improves the Long term Durability of concrete. II. MATERIALS

Ordinary Portland cement of 43 grade is used confirming to IS: 8112-1989. Crushed granite metal (graded) with 20 mm to a proportion of 60% and 10 mm to a proportion of 40% is used as coarse aggregate which is tested according to IS: 2386-1963 Part 1 to VIII. River sand according to IS: 383-1970confirming to zone – II is used as fine aggregate. Recron 3s Fiber is used. It was launched by Reliance Technology Centre for asbestos Cement Industry. Fosrocconplast SP 430 is used as admixture. Table – 1 Properties of Coarse aggregate S. No Property Value 1. Specific gravity 2.84 Bulk Density 2. Loose state 1551.02 kg/m3 Compacted state 1692.11 kg/m3 3. Water Absorption 0.90% 4. Flakiness Index 14.13% 5. Elongation Index 21.29% 6. Crushing value 21.33% 7. Impact Value 15.40% 8. Fineness Modulus 7.31 Table - 2 Properties of cement S. No Property Value 1. Specific gravity 3.15 2. Fineness of cement 3.5% 3. Normal consistency 30% i)Initial setting time 167min 4 ii)Final setting time 295min Compressive Strength 3days 24.7 N/mm2 5. 7days 35.63 N/mm2 28 days 45.94 N/mm2 Table - 3 Properties of Fine aggregate (River sand) S. No Property Value 1 Grading of sand Zone II as per IS383 2 Specific gravity 2.61 Bulk density 3 Loose state 1523.70kg/m3 Compacted state 1673.18kg/m3 4 Fineness modulus 2.49 5 Silt content 1% 6 Surface moisture 0.7% 7 Water absorption 1.52% Table – 4 Properties of Recron 3s Fiber (As per supplier) S. No Properties Value 1. Fiber type Polyester CT2424 2. Cut length 12mm

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

3. 4. 5. 6. 7. 8. 9. 10

Effective Diameter Specific gravity Melting point Elongation Young’s modulus Alkaline stability Acid resistance Dispersion

20-40 µ 1.34-1.39 250-265 Deg.c 20-60% >5000 MPa Very good Excellent Excellent

III. MIX DESIGN The concrete mix design is a process of selecting the suitable ingredients of concrete and determining their most optimum proportion which would produce, as economically as possible, concrete that satisfies a certain compressive strength and desired workability. The mix design is done according to IS: 10262-2009. The mix proportions adopted for M25 grade concrete is 1:1.94:3.57 with water/cement ratio of 0.46 and cement content of 360 kg/m³. For M40 grade concrete the adopted mix proportion is 1:1.51:2.98 with water/cement ratio of 0.38 and cement content of 430 kg/m³. A total of 4 mixes for each grade is adopted i.e. for M25 grade of concrete with 0%, 0.2%, 0.3%, 0.4% adding of Recron 3s fiber and for M40 grade of concrete 0%, 0.2%, 0.3% and 0.4% adding of Recron 3s fiber. IV. RESULTS AND DISCUSSIONS Workability in Terms of Slump Slump study is conducted with and without admixture. It can be observed that as the percentage of Recron 3s fiber increases in mix slump value decreases. Hence it can be concluded that with the increase in the fiber content workability decreases.

Fig. 1: Slump for M25 Grades of concrete Table – 5 Workability in terms of slump cone test S. No 1 2 3 4 Mix Design M25 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Slump (mm) 41 35 30 27 Admixture (%) 0.1 0.2 0.3 0.5

Fig. 2: Slump for M40 Grades of concrete

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Table - 6 Workability in terms of slump cone test S. No 1 2 3 4 Mix Design M40 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Slump (mm) 43 38 33 25 Admixture (%) 0.2 0.3 0.5 0.6

Workability in terms of Compaction Factor test The workability of concrete measured from compaction factor test, as the percentage of Recron 3s fiber increases in mix the compaction factor decreases. Hence it can be concluded that with the increases in the fiber content workability decreases. Table - 7 Workability in terms of Compaction Factor test for M25 grade of concrete S. No 1 2 3 4 Mix Design M25 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Compaction factor 0.84 0.83 0.81 0.80

Fig. 3: Compaction Factor for M25 Grades of concrete Table - 8 Workability in terms of compaction factor for M40 grade of concrete S. No 1 2 3 4 Mix Design M40 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Compaction factor 0.83 0.81 0.80 0.79

Fig. 4: Compaction Factor for M40 Grades of concrete

Workability interms of Vee-Bee time The workability of the concrete is measured from Vee-Bee consistometer as the percentage of Recron 3s increases Vee-Bee time increases so the workability decreases Table â&#x20AC;&#x201C; 9 Workability in terms of Vee-Bee time for M25 Grade of concrete. S. No 1 2 3 4 Mix Design M25 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Vee-Bee time(seconds) 11.5 13.25 15.40 17.20

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Fig. 5: Vee-Bee time for M25 Grade of concrete Table - 10 Vee-Bee time for M40 Grade of concrete S. No 1 2 3 4 Mix Design M40 % of Recron 3s fiber 0.0 0.2 0.3 0.4 Vee-Bee time(seconds) 11.09 12.4 16.2 22

Fig. 6: Vee-Bee time for M40 grade of concrete (seconds)

Compressive Strength Effect of addition of Recron 3s fiber for M25 mix From the graphs it can be observed that with the increase in the percentage of fiber, the compressive strength has increased over plain concrete. For M25 Grade the compressive strength has increased for proportions of fiber 0%, 0.2%, 0.3%, 0.4% in the range 0%, 3.44%, 18.21%, 12.78% fiber the compressive strength has increased respectively. Hence the fiber can be taken as optimum content at 0.3% addition of fiber. Effect of addition of Recron 3s fiber for M40 mix From the graphs it can be observed that with the increase in the percentage of fiber, the compressive strength has increased over plain concrete. M40 Grade the compressive strength has increased for proportions of fiber 0%, 0.2%, 0.3%, 0.4% in the range 0%, 2.93%, 10.60%, 6.40% fiber the compressive strength has increased respectively at 0.3% addition of fiber. Table â&#x20AC;&#x201C; 11 Compressive strength for M25 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID `0 0.2 0.3 0.4 7days strength 23.06 24.73 29.42 27.64 28days strength 32.55 33.67 38.48 36.71 56days strength 34.33 35.33 38.22 36.41 91days strength 36.42 38.45 40.89 38.84

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Fig. 7: Compressive strength for M25 grade of concrete (N/mm2) Table â&#x20AC;&#x201C; 12 Compressive strength for M40 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID `0 0.2 0.3 0.4 7days 33.89 36.33 39.92 38.74 28days 49.33 50.78 54.56 52.49 56days 52.94 56.22 58.77 56.89 91days 53.44 56.89 59.44 57.67

Fig. 8: Compressive strength for M40 grade of concrete (N/mm2)

Split Tensile Strength Effect of addition of Recron 3s fiber for M25 mix From the graphs it can be observed that with the increase in the percentage of fiber, the Split Tensile strength has increased over plain concrete M25 Grade the Split Tensile Strength has increased 0%, 0.2%, 0.3%, and 0.4% in the range 0%, 5.76%, 13.84%, 9.61% fiber the Split Tensile Strength has increased respectively. Effect of addition of Recron 3s fiber for M40 mix From the graph it can be observed that with the increase in the percentage of fiber, the Split Tensile Strength has increased over plain concrete. M40 the split Tensile strength has increased 0%, 0.2%, 0.3%, 0.4% in the range 0%, 19.21%, 43.77%, 25.62% fiber the Split Tensile strength has increased respectively. Table â&#x20AC;&#x201C; 13 Split Tensile strength for M25 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID

7days 28days 56days 91days

`0 2.26 2.60 2.89 3.00

0.2 2.31 2.75 2.95 3.14

0.3 2.59 2.96 3.04 3.24

0.4 2.47 2.85 3.00 3.18

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Fig. 9: Split tensile strength for M25 grade of concrete (N/mm2) Table â&#x20AC;&#x201C; 14 Split tensile strength for M40 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID `0 0.2 0.3 0.4 7days 2.68 2.82 2.99 2.94 28days 2.81 3.35 4.04 3.53 56days 3.35 3.78 4.34 3.87 91days 4.10 4.21 4.44 4.24

Fig. 10: Split tensile strength for M40 grade of concrete (N/mm2)

Flexural Strength Effect of addition of Recron 3s fiber for M25 mix From the graphs it can be observed that with the increase in the percentage of fiber, the Flexural strength has increased over plain concrete. M25 Grade the flexural strength has increased 0%, 0.2%, 0.3%, and 0.4% in the range 0%, 7.70%, 13.04%, 9.88% fiber the flexural strength has increased respectively. Effect of addition of Recron 3s fiber for M40 mix From the graphs it can be observed that with the increase in the percentage of fiber, the flexural strength has increased over plain concrete. M40 Grade the flexural strength has increased by 0%, 0.2%, 0.3%, 0.4% in the range 0%, 5.68%, 23.30%, 11.55% fiber the Flexural strength has increased respectively. Table - 15 Flexural strength for M25 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID `0 0.2 0.3 0.4 7days 5.06 5.45 5.61 5.56 28days 5.06 5.45 5.72 5.56 56days 5.33 5.37 6.27 5.96 91days 5.37 5.90 6.30 6.01

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

Fig. 11: Flexural strength for M25 grade of concrete (N/mm2) Table – 16 Flexural strength for M40 grade of concrete (N/mm2) % of Recron 3s Fiber Mix ID `0 0.2 0.3 0.4 7days 5.21 5.68 6.66 6.15 28days 5.45 5.76 6.72 6.08 56days 6.03 6.15 6.80 6.43 91days 6.23 6.79 7.35 6.83

Fig. 12: Flexural strength for M40 grade of concrete (N/mm2)

V. CONCLUSIONS Results were analyzed to derive useful conclusions regarding the strength characteristics of Fiber Reinforced Concrete (FRC) for M25 and M40 concrete has been used as reference mix. The following conclusions may be drawn from the study on strength characteristics of fiber reinforced concrete properties.  The Workability of concrete measured from slump cone test, as the percentage of Recron 3s fiber increases in mix slump value decrease. Hence it can be concluded that with the increase in the fiber content workability decreases.  The workability of concrete measured from compaction factor test, as the percentage of Recron 3s fiber increases in mix the compaction factor decreases. Hence it can be concluded that with the increases in the fiber content workability decreases.  From the experimental results, the optimum percentage recommended is 0.3% Recron 3s fiber for achieving maximum benefits in compressive strength, split tensile strength and flexural strength for the characteristics of Recron 3s fiber reinforced concrete.  The compressive strength of M25 concrete at 28 days increased with the addition of Recron 3s fiber up to 0.3% level when compared to that of plain concrete. The percentage increase for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% range in the 0%, 3.44%, 18.21%, and 12.78% over plain mix. The maximum percentage increases in 18.21% at 0.3% addition of Recron 3s fiber.  The compressive strength of M40 concrete at 28 days increased with the addition of Recron 3s fiber up to 0.3% level when compared to that plain concrete. The percentage increases for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% ranges in the 0%, 2.93%, 10.60%, and 6.40% over plain mix. The maximum percentage increases in 10.60% at 0.3% addition of Recron 3s fiber. All rights reserved by www.ijste.org

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Study on Properties of Concrete using Recron 3s Fiber (IJSTE/ Volume 4 / Issue 3 / 010)

   

The split Tensile strength of M25 concrete at 28 days increased with the addition of Recron fiber up to 0.3% level when compared to that of plain concrete. The percentage increase for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% ranges in 0%, 5.76%, 13.84%, and 9.61%. The maximum percentage increases in 13.84% at 0.3% addition of Recron 3s fiber. The split Tensile strength of M40 concrete at 28days increased with the addition of Recron 3s fiber up to 0.3% level when compared to that of plain concrete. The percentage increase for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% ranges in 0%, 8.18%, 43.77%, and 25.62%. The maximum percentage increases in 43.77% at0.3%addition of Recron 3s fiber. The flexural strength of M25 concrete at 28 days increased with the addition of Recron 3s fiber up to 0.3% level when compared to that of plain concrete. The percentage increase for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% ranges in 0%,7.70%,13.04%, and 9.88%. The maximum percentage increases in13.04% at 0.3% addition of Recron 3s fiber The flexural strength of M40 concrete at 28 days increased with the addition of Recron 3s fiber up to 0.3% level when compared to that of plain concrete. The percentage increase for Recron 3s fiber mixing in 0%, 0.2%, 0.3%, 0.4% ranges in 0%, 5.68%, 23.30%, and 11.55%. The maximum percentage increases in 23.30% at 0.3% addition of Recron 3s fiber. REFERENCES

[1] [2] [3] [4] [5]

Adhoc, “Fiber reinforced cement and concrete” International Journal of Engineering Research and application (IERA), Vol.1, No.3, pp 68-78,(2013). AS 3972 General purpose and blended cements. Standards Australia, Sydney 2010 Balaguru and Kurtz, “Experimental study on post crack behavior of FRC” International journal of advanced Engineering Technology, Vol.2, pp 78-96,(2000). Balvirsingh and jaspalsingh “Experimental study on recron 3s fiber”, International journal, Vol.2,pp-263-273,(2005) Beranad: “Experimental study on creep behavior of cracked FRC”, International journal, Vol.1,pp 45-65(2004).

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Study on Properties of Concrete using Recron 3s Fiber

Published on Feb 6, 2018

IJSTE

The aggregates both fine and coarse are bonded together by the cement and mixed with water to form concrete. The concrete has become so popular and indispensable because of its inherent in nature brought a revolution in applications of concrete. Concrete has unlimited opportunities for innovative applications, design and construction techniques. Its great versality and relative economy in filling wide range of needs has made it very competitive building material. In this present investigation workability, strength properties of concrete with Recron 3s fiber in proportions of 0%, 0.2%, 0.3% and 0.4% is studied for M25 and M40 grade concrete cubes, cylinders and prisms.Recron3s Fiber Reinforcement Systems can provide a solution to Recron 3s fibers are engineered micro fibers with a unique "triangular" cross-section, used in secondary reinforcement of concrete.