e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:02/Issue:09/September-2020
Impact Factor- 5.354
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EXPERIMENTAL ANALYSIS OF LIGHT WEIGHT POROTHERM BLOCKS IN SLABS J. Charles *1, R. Manikandan *2 *1M.E.,
Student, Structural Engineering , Agni College of Technology, Chennai, TamilNadu, India. *2Assistant
Professor , Department of Civil Engineering ,Agni College of Technology, Chennai, India.
ABSTRACT In a simply supported RCC slab the upper portion of the slab is subjected to compressive force and the lower portion is subjected to tensile force. Concrete performs well in compression force while its weak in tension , so the steel reinforcement is placed in tension zone The Filler slab made by porotherm blocks placed between steel bars and the concrete is put into the poured between the blocks. In this method less amount of concrete is used.The cement and steel usage is reduced to 45%. .Porotherm used structure is less hazardable during earthquake. Porotherm bricks used for roof slab and sunshades. It is very suitable for low income users. Flexural strength of the infill slab and RCC slab is done comparatively. Keywords – Porotherm block, Flexure strength, Compressive strength, Deflection.
I.
INTODUCTION
Porotherm blocks are low weight clay blocks. It is offering exceptionally fast, virtually dry construction, plus high strength and thermal efficiency. The Porotherm blocks evolved from hand made bricks into modern blocks. It is successfully used in many European countries for the past 30 years. These blocks are used in Europe to construct both residential and commercial structures. These blocks are manufactured as vertically perforated walling unit. These blocks are made from clay ,dried and fired. These blocks consist innumerable pores and gives thermal insulation and vapour permeability.
II.
MATERIALS
Shuttering: Innersize of slabs-1.5m*0.6m, made by wood. Laying of porotherm bricks : For porotherm slab: Brick name HP100 , (L,H,W) 400mm,100mm,200mm, placed in between shuttering ends ,spacing 140mm,4 number of blocks. Providing reinforcement: Porotherm slab: Cover of slab 10mm, 10mm dia,5 bar in shorter direction,2bar in longer direction. Rcc slab: Cover of slab 10mm,3 bar in longer direction,8 bar in shorter direction. Placing of concrete: Porotherm slab- Grade of concrete M30,placed over reinforcement and sides of porotherm bricks. Rcc slab- Grade of concrete M30,reinforcement provided in tension zone. Demoulding: After casting the slabs is kept for one day and shuttering are demoulded. Curing: For 28 days curing provided portable water used for curing.
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e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:02/Issue:09/September-2020
Impact Factor- 5.354
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Casting:
Fig-1
Fig-2
Fig-3
III.
TESTING
Load is applied on the slabs , initial loading of the slabs is 200kg. After every 24 hours loading is improved by 100kgs before loading deflection are noted. And then 400kg,500kg,600kg loads are applied and deflection of the slabs is calculated.
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e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:02/Issue:09/September-2020
Impact Factor- 5.354
Fig-4
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Fig-5
IV.
RESULT
Load vs deflection chart for porotherm slab and RCC slab WEIGHT (kgs)
DEFLECTION (mm) POROTHERM SLAB RCC SLAB
200 400 500 600
3 13 18 27
1 11 17 24
30
25
20 RCC Slab 15
Porotherm slab 0
10
5
0 200
400
500
600
Comparision Between Precastslab And Normal Concrete Slab COMPARISON CRITERION
PRECASTSLAB USING POROTHERM
Deflection
27mm at 600Kgs weight.
Cost Weight
low 171Kgs
NORMAL CONVENTIONAL SLAB Maximum 24mm for 600Kgs weight. high 228Kgs
Thermal Insulation Green House Effect
1.7 (W/m²K) Energy Efficiency,
3 (W/m²K) Not Applicable
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e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:02/Issue:09/September-2020
Impact Factor- 5.354
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Material with recycled content, Local Material. Time Taken To Complete The Slab Finishing Aesthetic Appearance
2Hrs
4Hrs
Need Good in appearance
Need Normal
V.
CONCLUSION
The porotherm blocks placed between steel bars and the concrete is put into the gaps between the blocks. By this method the quantity of concrete is reduced. The cement and steel usage is reduced to 45%. It is very suitable for low income users. It reduces the deadload of the structure. Porotherm used structure is less hazardable during earth quake. Portherm bricks are used for roof slabs and sunshades. The comparative experimental study was done to find out strength and stablility of such roof slabs and sunshades. The strength and stability level of porotherm slab is satisfiable and suitable for low budget builders.
VI.
REFERENCE
[1]
A.Pisanty ,Transverse flexural and torsional strength of Prestressed Precast Hollow-Core Slabs Tailor Made Concrete Structures – Walraven & Stoelhorst (eds) © 2008 Taylor & Francis Group, London, ISBN . [2] Al-Tuhami AbuZeid Al-Tuhami Abd Allah and Ahmed Ismail Gabr Flexural Behavior of RC Sandwich and Hollow Block Bearing Walls. [3] ANSYS (2010). Release 14.0 Documentation. ANSYS Structures” 2013. [4] Willam, K. J. and Warnke, E. P. (1975), “Constitutive Models for the Triaxial Behavior of Concrete,” Proceedings of the International Assoc. For Bridge and Structural Engineering, vol 19, pp. 1 - 30. [5] Sivagamasundari.R1, Kumaran.G Experimental study on the behaviour of concrete one way slabs reinforced with GFRP reinforcements under constant and variable amplitude repeated loadings,INTERNATIONAL JOURNAL OF CIVIL AND STRUCTURAL ENGINEERING Volume 2, No 2, 2011 Technical report and design guidance for the use of Porotherm blocks in the UK [6] F. Koksal · A. Ilki · M. A. Tasdemir Optimum Mix Design of Steel-Fibre-Reinforced Concrete Plates [7] Nguyen Van CHANH STEEL FIBER REINFORCED CONCRETE. [8] R. D. Neves and J. C. O. Fernandes de Almeida Compressive behaviour of steel fibre reinforced concrete. [9] Mr. Nikhil A. Gadge1, Prof. S. S. Vidhale2 Mix Design of Fiber Reinforced Concrete (FRC) Using Slag & Steel Fiber Trevor D. Hrynyk and Frank J. Vecchio Behavior of Steel Fiber-Reinforced Concrete Slabs under Impact Load. [10] A.M. Shende1, A.M. Pande2, M. Gulfam Pathan Experimental Study on Steel Fiber Reinforced Concrete for M-40 Grade,International Refereed Journal of Engineering and Science (IRJES) Volume 1, Issue 1 (September 2012) [11] Saaid I. Zaki1, Khaled S. Ragab2 and Ahmed S. Eisa3 Flexural Behaviour of Steel Fibers Reinforced High Strength Self Compacting Concrete Slabs,International Journal of Engineering Inventions Volume 2, Issue 5 (March 2013) [12] Amit Rana Some Studies on Steel Fiber Reinforced Concrete International Journal of Emerging Technology and Advanced Engineering Volume 3, Issue 1, January 2013).
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