polymer modified steel fibre reinforced concrete
TRANSCRIPT
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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
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.
Water Cement Aggregates1 1.21 2.07
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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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3 Days 7 Days 28 Days0
0.5
1
1.5
2
2.5
3
M25M25+SBRM25+SFM25+SBR+SF
Split Tensile Strength
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3 Days 7 Days 28 Days0
0.5
1
1.5
2
2.5
3
M25M25+SBRM25+SFM25+SBR+SF
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