STRENGTH PROPERTIES OF FLYASH BASED GEOPOLYMER CONCRETEE

Transcription

1 International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 1, January 2017, pp , Article ID: IJCIET_08_01_098 Available online at &IType=1 ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed STRENGTH PROPERTIES OF FLYASH BASED GEOPOLYMER CONCRETEE V.Sowjanya PG Student, Civil Engineering Department, K L University, Vaddeswaram, Guntur, N. Srujana Associate Professor, Civil Engineering Department, K L University, Vaddeswaram, Guntur ABSTRACT Objective: The experimental study is done on various parameters i.e., Strength parameters, NaOH solution concentration, the alkalescent hydroxide to alkalescent salt ratio, period of curing, additional water in mix has been investigated. Method: The mix is trailed initially for 8 Molarity. The Alkaline content used in the study is the amalgam of Sodium Hydroxide and Sodium silicate with the different ratios 1:2, 1:2.5, 1:3. The total numbers of specimens 81 are being casted The Geopolymer specimens are tested for their Compressive, Flexural and Tensile strengths at the ages of days. Findings: The strength properties strength are increased with the increase in activator ratio. The strength of all GPC specimens improved with the increase in curing time.. Applications/ Improvements: Flyash based geopolymer concrete can be used as precast products like parking tiles, precast GPC beams, girders, pavement tiles, railway precasted sleepers, building blocks, electric power poles. They are good resistance towards fire, permeability. Key words: Geopolymer concrete, Fly ash, Sodium Silicate, Sodium Hydroxide Cite this Article: V.Sowjanyaa and N. Srujana, Strength Properties of Flyash Based Geopolymer Concrete. International Journal of Civil Engineering and Technology, 8(1), 2017, pp /issues.asp?jtype=ijciet&vtype=8&itype= =1 1. INTRODUCTION Concrete is the most typical material used in construction. Concrete is casted by victimization of normal cement (OPC) because of the binding property. While production of OPC highh quantity of greenhouse gas is discharged in to the atmospheree ( one weight unit of cement production releases roughly 1tonne of CO2) that leads to warming 3,4.Several efforts were made to measure in advancement to enhancement the utilization of cement in casting the concrete so as to handle the world warming problems 4,5. These includes the use of supplementary cementing ingredients like Granulated Blast chamber scum, Silica Fume, ricebarren earth, the landfills is husk ash and Metakaolin 6. Due to the accumulation of the fly ash on the increasing day to day. Fly ash established Geo-polymer concrete may be a recently developed concrete

2 Strength Properties of Flyash Based Geopolymer Concrete The elementary constituents of ash-based Geo-polymer concrete are fly ash, aggregates, sodium salt, sodium hydroxide 7. The objectives of the present study square measure to develop a Geo compound concrete combine, to identify and study the result of parameters like matter quantitative relation, type of natural action that impound effects on the properties of fly ash-based geo compound concrete, to study short-term engineering properties of the recent and hardened state of ash, based mostly geo compound concrete, to study the performance of ash based geo compound concrete 8,9. 2. OBJECTIVE The Experimental Study Is Done On Various Parameters I.E., Strength Parameters, NaoH Solution Concentration. The Alkalescent Hydroxide To Alkalescent Salt Ratio, Period Of Curing, Additional Water In Mix Has Been Investigated. 3. METHODOLOGY 3.1. Materials Used Fly ash. Metakaolin Sodium hydroxide Sodium silicate Aggregates Fly Ash Class F type of flyash, collected from Vijayawada Thermal Plant is used are ingredient of the casted concrete. Figure 1 Fly ash Alkaline Solution: Anamalgamation of alkalescent hydroxide solution and alkalescent salt was preferred. The Sodium-based solutions were preferred as they were economical than that of the Potassium-based. Sodium silicate flakes are shown in Fig

3 V.Sowjanya and N. Srujana Figure 2 Sodium hydroxide flake Fine Aggregate The locally available fine aggregate, confining to Zone II. Initially the aggregate chosen is sieved through 4.75mm and the passing material is chosen for the test Coarse Aggregate Locally available coarse mixture of about 10mm linear unit size were chosen. 3.2 Preparation of Alkaline Activator Solution A amalgamation of alkaline salt solution, alkalescent hydroxide solution was selected which results an alkaline liquid. 320 g (8 X 40= 320) of caustic soda flakes dissolved in one litre of water to rearrange element hydroxide resolution of 8M. The Alkaline activator resolution should be prepared twenty-four hours before its intended use. The sodium hydroxide solution is mixed with glass resolution to induce the required alkaline resolution twenty minutes before making the geopolymer concrete. 3.3 Trial mix proportion of Geopolymer concrete Table 1 represents the Quantities of materials for 1 cubic meter of Geo polymer concrete S.No Material Quantities 1:2 1:2.5 1:3 1 Fly Ash kg/m kg/m kg/m 3 2 Metakaolin kg/m kg/m kg/m 3 3 Fine aggregate ( Passing through 540 kg/m kg/m kg/m mm size sieve) 4 10mm size coarse aggregate 1260 kg/m kg/ /m kg/m 3 5 Mass of NaOH Solution 62.1 kg/m kg/ /m kg/m 3 6 Mass of Na 2 SiO 3 Solution kg/m kg/m kg/m 3 7 Liquid to Fly ash Ratio Extra water 45.5 kg/m kg/m kg/m MIXING AND CURING Mixing NaOH solution and Na 2 SiO 3 solution should be 20mins before mixing it with the dry materials. All these ingredients were mixed for about 3 minutes. After casting of specimens compaction is done. Specimens are compacting on a vibrating table for 10 seconds. The GPC mix was shown in Fig 3. Three 836

4 Strength Properties off Flyash Based Geopolymer Concrete different mixes were casted in this study, for respective mix 27 cubes of 150mm,27 cylinders of diameter 150mm and height 300mm and 27 beams of 500mm x 100mm x 100mm were cast to study the compressive test, split tensile test and flexural f test of each mix. Figure 3 Mixing of GPC 3.4.2Curing After demoulding of these specimens, they were maintained at 270C (room) temperature. The normal temperature maintained during the test action of the sample was 230 C. Fig 4 shows the specimens under Ambient curing. Figure 4 Specimens under curing 4] 3.5 Testing The specimens were tested and strengths were calculated for 3, 7,28 days. The failure of specimens were shown in Fig 5. IJCIET/index.asp 837

5 V.Sowjanya and N. Srujana 4. RESULTS Figure 5 Testing of specimens The various strength tests to be done are Compressive test Split tensile test Flexural test 4.1. Compressive Strength The cube specimens are tested in CTM to verify their compressive strengths at the age of 3days, 7days and 28days of ambient action. Fig 6 represents the compressive strength of concrete. As the activator ratio increases there is increment in Compression strength of the specimens with respect to age of the specimens. Figure 6 Compressive age of days for different Activator ratios 4.2. Split Tensile Strength The Cylinder Samplings are tested in CTM for Tensile strength of concrete. e. Figure 7 represents the split tensile strength of concrete.as the activator ratio increases there is increment in Split tensile strength of the specimens with respect to age of the specimens

6 Strength Properties of Flyash Based Geopolymer Concrete Figure 7 Split tensile age of days for different Activator ratios 4.3. Flexural Strength The beam specimens are tested ted using two point loading method as per I.S Fig 8 represents the Flexural Strength of concrete. As the activator ratio increases there is increment in Flexural strength of the specimens with respect to age of the specimens. 5. CONCLUSIONS Figure 8 Flexurall age of days for different Activator ratios 1. The strength properties viz., Compressive, Split tensile and Flexural strength increased with the increase in activator ratio. 2. The strength of all GPC specimens improved with increment in time of curing. 3. The % increase in compressive strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 6.55%, 16.71%, for 7 days 4.95%, 4..07% and 2.3%, 11% for 28 days. 4. The % increase in split-tensile strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 21%, 30.43%, for 7 days 4.06%, 3.12% and 3.125%, 18.18% for 28 days

7 V.Sowjanya and N. Srujana 5. The % increase in flexural strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 0 %, 9%, for 7 days 14.9%, 0% and 0%, 39.52% for 28 days. REFERENCES [1] Davidovits, J Pyramids of Egypt Made of Man- Made Stone, Myth or Fact? Symposium on Archaeometry Smithsonian Institution, Washington, DC. [2] Davidovits, J Geopolymer Chemistry and Applications. Institut Géopolymère, Saint-Quentin, France. [3] Geopolymer Institute What Is a Geopolymer? Introduction. Institut Géopolymère, Saint-Quentin, France. Accessed on January 29,2010, [4] Hardjito, D., S. Wallah, D. M. J. Sumajouw, and B. V. Rangan On the Development of Fly Ash Based Geopolymer Concrete. ACI Materials Journal, vol. 101, no. 6. [5] Rangan, B. V. Low-Calcium, Fly-Ash-Based Geopolymer Concrete. Concrete Construction Engineering Handbook. Taylor and Francis Group, Boca Raton, FL, [6] Lloyd, N., and V. Rangan Geopolymer Concrete Sustainable Cementless Concrete. ACI Special Publication SP-261, 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues. American Concrete Institute, Farmington Hills, MI. [7] Sarker, P. K., Grigg, A. and Chang, E.H. Bond Strength of Geopolymer Concrete with Reinforcing Steel in: Zingoni, A. (ed) Proceedings of Recent Development in Structural Engineering, Mechanics and Computation, The Netherlands, 2007, pp [8] G. Yamini and Dr. S. Siddiraju, An Experimental Research on Strength Propereties of Concrete by The Influence of Flyash and Nanosilica as A Partial Replacement of Cement. International Journal of Civil Engineering and Technology, 7(3), 2016, pp [9] V. Subbamma and Dr. K. Chandrasekhar Reddy, Experimental Study on Compressive Strength of Plain Cement Concrete with Partial Replacement of Cement by Flyash & Metakaolin. International Journal of Civil Engineering and Technology, 7(6), 2016, pp [10] Siddiqui KS, Strength and Durability of Low calcium Fly-ash based Geopolymer Concrete, Final year Honours dissertation, The University of Western Australia, Perth, [11] Sofi, M., van Deventer, J. S. J., Mendis, P. A. and Lukey, G. C. Bond performance of Reinforcing Bars in Inorganic Polymer Concrete (IPC), Journal of Materials Science. [12] Sumajouw, M. D. J. and Rangan, B.V., Low-Calcium Fly Ash-Based Geopolymer Concrete: Reinforced Beams and Columns Research Report GC3, Faculty of Engineering, Curtin University of Technology,