polymer modified steel fibre reinforced concrete

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POLYMER MODIFIED STEEL FIBRE REINFORCED CONCRETE

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2PAPER ON PMSFC

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3POLYMER MODIFIED STEEL FIBRE REINFORCED CONCRETE

Steel fiber reinforced concretes are structural materials that are gaining importance quite rapidly due to the increasing demand of superior structural properties.

This is the concrete formed by the addition of a polymer styrene butadiene rubber emulsion (SBR) to steel Fibre Reinforced Concrete to produce polymer modified steel fibre reinforced concrete (PSFC).

These composites exhibit attractive tensile and compressive strengths, low drying shrinkage, high toughness, high energy absorption and durability.

This is due to the tendency of propagating micro-cracks in cementitious matrices to be arrested or deflected by fibres, which is guaranteed by the local bond between fibres and matrix

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4Features of Polymer modified SFRC

Almost Equivalent compressive strength Improved flexural strength Better Performance Enhanced cohesion workability / consistency Reduced shrinkage / creep. Durability - Better service life of concrete

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5Material Specifications

Ordinary Portland Cement (OPC) Silica is added to reduce the dosage of chemical admixtures needed to

get required slump 12 mm nominal maximum aggregate is used as coarse aggregate and

fine aggregate is the natural sand free from impurities. Locally available fine and coarse aggregates with specific gravity 2.78

and 2.58 respectively.

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6Properties Of Steel Fibers Used

Type Crimped round

Length 36mm

Diameter 0.45mm

Aspect Ratio 80

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7Properties Of SBR Rubber (Latex) Used

Polymer Type Styrene Butadiene68 ± 3% Styrene32 ± 3% Butadiene

Average Polymer Particle Size 1500 to 2500 AngstromsEmulsion Stabilizers 32 ± 3% Butadiene

Anionic and non-anionicsurfactants68 ± 3% Styrene

Percent Solids 46.20Weight per liter, Kg at 25ºC 1.005 to 1.039Ph 9.5 to 10.5Color White

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8Type of Samples

SBR+M25 SF+M25 SBR+SF+M25 M25

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9MIX DESIGN

For SBR+M25

Note: w/b ratio is 0.44%, SBR Latex is added 10% by wt. of binder

For SF+M25

Note: w/b ratio is 0.44%, and steel fibre content is 0.75% by volume

Water Cement Aggregates1 1.21 2.07


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10 SBR+SF+M25

Note: w/b ratio is 0.44%, 15% SBR-latex by weight of binder is added to the mix and steel fibre content is 0.75% by volume.

In all above mixes 7% of silica fume Is added as a partial replacement for cement, to mix super plasticizer (Glenium-51) Is added in the ratio of 1% of binder.


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11Properties and Test Results

Properties Age M25 M25+SBR M25+SF M25+SBR+SF

Compressive Strength (N/mm2)

3 Days 13.13 10 14.33 17.37 Days 20.66 13.16 25.1 21.928 Days 33 26.16 35 32.5

Compressive Strength

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12Split Tensile Strength

Properties Age M25 M25+SBR

M25+SF M25+SBR+SF

Split Tensile Strength (N/mm2)

3 Days 0.73 0.69 1.19 1.277 Days 1.27 1.22 1.59 1.8228 Days 1.81 1.93 2.22 2.58

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Properties

Age M25 M25+SBR M25+SF M25+SBR+SF

Flexural Strength (N/mm2)

3 Days 1.14 0.9 1.11 1.397 Days 1.55 1.6 1.79 1.928 Days 2.05 2.29 2.36 2.58

Flexural Strength

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14Graphical Representaion

3 Days 7 Days 28 Days05

10152025303540

M25M25+SBRM25+SFM25+SBR+SF

Compressive Strength

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0.5

1

1.5

2

2.5

3


Split Tensile Strength

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0.5

1

1.5

2

2.5

3


Flexural Strength

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17Advantages of PSFC

Improved flexural strength Improved split tensile strength Improved adhesion and bond strength. High Durability Improved fire resistance Reduced shrinkage / creep.

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18Disadvantages

The only main disadvantage of this concrete is that its compressive strength is little less than SFC

Handling of fiber while mixing in concrete should taken with due precautions as it can cause accidents

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19Applications of PSFRC

Used in pavements and tunnel linings Used in airport pavements Bridge deck slab repairs Used where there are more chances of crack development Fire resistant structure

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20Conclusions

Addition of steel fibres to a concrete will improve both its flexural and compressive strength.

The strengths increase significantly with fibre content Addition of polymer to this concrete increases the flexural str.

And split tensile str. But reduces the compression str. Value. Due to the compactness that is filling of voids in the matrix

achieved due to latex and fibre filling in the concrete matrix, it is observed that the SBR+SF+M25 has considerable amount increased in flexural strength as compared to other matrix used.

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21References

www.google.co.in www.ijaiem.org (International Journal of Application or

Innovation in Engineering & Management) www.nbmcw.com/articles/concrete/2692 Paper on Study of Polymer modified steel fiber reinforced

concrete: Dr. S. Suriya S. Sowmiya Sadhana, Suman Naaz Shaikh

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Thank You