STRENGTH PROPERTIES OF MARINE ALGAE CONCRETE
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1 ISSN: e-issn: CODEN: RJCABP STUDY ON THE STRENGTH PROPERTIES OF MARINE ALGAE CONCRETE R. Ramasubramani*, R. Praveen and K. S. Sathyanarayanan Department of Civil Engineering, Faculty of Engineering and Technology, SRM University, Kattankulathur , Tamil Nadu, India. * ABSTRACT Study on marine algae was performed which concluded that the chemical reaction with the cement makes the environment free from pollution. Since algae are environmental friendly, this makes the concrete more economic and, at the same time, there is a reduction of the problem on waste. In this study, marine brown algae were used as additive material to concrete. With a fixed water to cement ratio (W/C = 0.5), marine brown algae is added at 2%, 5%, 8% and 10% from the cement content in producing M25 grade concrete. Harden tests were performed at 3, 7 and 14 days. The results showed that the various strength properties of concrete increased or decreased with addition of marine algae. The compressive strength tends to decrease for more addition of marine algae. Deflection characteristics test showed that the ultimate load carrying capacity of optimum mix concrete beam was higher than conventional concrete beam. This study shows that 8% addition of marine algae to concrete showed an increase in strength properties and when the addition increased to 10% the properties started to decrease. Keywords: Marine brown algae, compression test, spilt tensile, Flexure, E-value. RASĀYAN. All rights reserved INTRODUCTION Algae are photosynthetic aquatic plants that utilize inorganic nutrients such as nitrogen and phosphorus. The Phaeophyceae or brown algae, is a large group of mostly marine multicellular algae, including many seaweeds. Worldwide there are about species of brown algae. Some species are of sufficient commercial importance, such as Ascophyllumnudism, that they have become subjects of extensive research. Most brown algae contain the pigment fucoxanthin, and hence they are in greenish brown colour. Genetic studies show their closest relatives to be the yellow green algae. Brown algae exist in a wide range of sizes and forms. The smallest members of the group grow as tiny, feathery tufts of threadlike cells no more than a few centimeters long. Some species have a stage in their life cycle that consists of only a few cells, making the entire alga microscopic. Other groups of brown algae grow too much larger sizes. These are used as fertilizer, energy source, and food source, for pigments, pollution control, and medicinal purposes. Concrete based on Portland cement is the most widely used construction material in the world, and its production follows a trend of growth. In 2011, the world production of Portland cement reached 2.8x10 9 tonnes and is expected to increase around 4x10 9 tonnes for the About 15% of the total concrete production contains chemical admixtures, which are chemicals added to concrete, mortar or grout at the time of mixing to modify their properties, either in fresh or hardened state Need for this study Research is always more interested in the use of such products in the concrete mix. This makes the concrete more economic and, at the same time, there is a reduction of the problem in waste. By studying the properties of algae concrete the work is necessary in pollution less environment and to avoid the voids in concrete.
2 Marine algae About 71% of the world is surrounded by ocean. The most important herbivores in ocean are phytoplankton and benthic algae. The marine algae familiarly known as seaweeds are a diverse group of photoautotrophic organisms of various shapes (filamentous, ribbon like, or plate like) that contain pigments such as chlorophyll, carotenoids, and xanthophylls. The growth of marine algae is abundant in coastal area since sandy beaches provide excellent attachment points in a constantly moving and dynamic environment of the sandy shore. The first type of plant life to attach itself to the coastal concrete structure is a filamentous macro algae. The colonization is likely to be, due to the constant abrasion of the lower regions by the action of the tide lifting the sand and small stones from around the base of the structure. A number of seaweeds can be found in this type of environment although there are usually a few dominant species like Chaetomorpha antennae. These green algae are classified in the Phylum Chlorophyta. Many species of green algae grow attached to rocky and concrete substrates on or near the ocean's surface. In general, because they are attached to a substrate, they are not tossed up on the beach by the waves. Marine brown algae concrete Marine Algae are the one of the nature friendly substance. It controls the chemical reaction of Cement. It avoids voids and decrease permeability of the concrete. Marine algae are the self-consolidating concrete (SCC). Marine algae, which are, can reduce the metal equilibrium concentration to very low levels in metals. In this Fig.-1 shows the marine brown algae. Then Fig.-2 shows the collecting to the brown algae. It will help to avoid the voids of concrete. So the various percentages of wet and dry marine brown algae concrete 2%, 5%, 8% and 10% is used on concrete. Fig.-1: Marine Brown Algae Fig.-2: Collecting Marine brown algae EXPERIMENTAL The project deals with the study of concrete when marine algae are added to concrete at different percentages. The primary concern of this study is to determine the strength characteristics of marine algae concrete. 1. Cube Specimens A mould of internal dimensions of mm was used for casting of cubes for compression strength for both conventional concrete and maine algae concrete Specimens. 2. Cylinder Specimens A mould of internal dimensions of 100 mm diameter and 200 mm height was used for casting of cylinder for split tensile strength for both conventional concrete and steel fiber reinforced concrete Specimens. The Fig.-3 shows the Casting of Cubes and cylinders. 707
3 Fig.-3: Casting of Cubes and cylinders 3. Beam Specimens A mould of internal dimensions of mm was used for casting beams for flexural strength for both conventional concrete and marine algae concrete specimens. Fig.-4 shows the casting of flexure beams. Fig.-4: Casting of flexure beams Long Beams A mould of internal dimensions of mm are used for casting of long beams tested under two point loading for deflection and crack formation, for both conventional concrete and optimum mix proportions. The Fig.-5 shows the wooden moulds used for casting of long beams. Casting and curing of specimens The ingredients of the concrete i.e., cement, fine aggregate, coarse aggregates, etc., were collected according to the specified specifications and mixed in concrete mixer according to the mix proportions. The concrete was placed in moulds as specified pervious sections. The concrete was laid in three layers and each layer was tamped with the tamping rod, after filling the mould completely, the moulds should 708
4 vibrate by keeping on a vibrating machine.after casting the specimens were kept undisturbed for 24 hours. The specimens would de-mould and kept it in a curing tank in which the water should be at least 50 mm above the specimen surface. Fig.-6 shows the curing of specimens in curing tank. The curing of is done for 28 days to attain the target mean strength the design concrete grade (Fig.-6). Fig.-5: Wooden Moulds for Long Beams and Casting Fig.-6: Curing of Specimens in Curing Tank. Impact test Impact test was conducted for concrete specimen with dimension of 150 mm diameter and 60 mm. The specimen was placed carefully on the plate of drop weight machine. Iron ball was placed over the specimen and weight is dropped carefully over the iron ball. This procedure was continued till the specimen got crack. The number of blows given for the specimen for cracking is noted (Fig.-7). EXPERIMENTAL Deflection test for long beams Specimen details The cross-sectional dimension of long beams was taken as and length was take as 1200 mm. The Fe 415 grade of steel was used for both longitudinal and transverse reinforcements. Table-1 show the details of minimum longitudinal reinforcements and spacing of transverse reinforcements required and 709
5 actually provided respectively.the beams had been designed and made strong to avoid the failure, especially at the middle portion. The beam size and length were chosen to ensure that the beams would fail in deflection and also to test the specimen with the loading frame and the testing facilities available in the structural laboratory of SRM University. Fig.-7: Drop Weight Impact Test on Concrete Specimen. Conduct of experiments The experiment conducted was explained here in a detailed manner. The beam to be tested was lifted and kept inside the loading platform of the frame where the steel roller supports were made ready to carry the beams on both edges to act as simply supported beam. Indian standard medium beam (ISMB) 175 steel beam was placed parallel and seated on the top surfaces of the beam. Hydraulic jack of 25 T capacities was placed above the ISMB I75 for application of load. 20 T capacity proving ring was placed above the hydraulic jack at its centre. The beam was so adjusted that the centres of the proving ring and beams were in the same line by using plumb-bob. Dial gauge was fixed at the mid-point of the beam portion and supports are placed 5 cm away from either edge of the beam. The beam loading is done as of two point loading simply supported beam. Now the arrangement was ready for performing the experiment. The dial gauges were also set for zero before the start of tests. The load was constantly applied through the hydraulic jack. ISMB used transferred the load to its edges equally. Beams were allowed and subjected to a constant increase in the rate of loading till the ultimate load was reached. RESULTS AND DISCUSSIONS As a part of experimental investigation, various tests were conducted on the material to test their properties and in finding out the strength and durability characteristics of the concrete. Compressive strengths, flexural strengths and tensile strengths were measured using a compressiontesting machine with a maximum capacity of 2000kN. For all tests, each value was taken as the average of three samples. Test results for conventional concrete and marine algae concrete for 3, 7 and 28 days curing were tabulated. The following tests were conducted to determine the property of materialsi. Determination of fineness of cement ii. Determination of normal consistency of cement iii. Determination of initial setting time of cement iv. Specific gravity of cement v. Specific gravity of aggregates vi. Specific gravity of glass powder 710
6 Compressive Strength Three numbers of the sample in each of concrete were subjected to compression test using the compression-testing machine. The result of the average strength of cubes is shown in Table-1. The comparison of the compressive strength of conventional concrete with that of marine algae concrete is illustrated using a bar chart in Fig.-8. Table-1: Compressive strength results for Conventional concrete Vs Marine algae concrete (N/mm 2 ) No. of days Percentage addition of Marine algae 2% 5% 8% 10% Conventional Concrete The concrete where marine algae were added to concrete showed an increase in compressive strength. The strength increased with the number of days of curing. The maximum compressive strength attained was N/mm 2 for 8% addition of marine algae to concrete. Compressive strength CC 2% 5% 8% 10% Percentage addition of Marine algae 3 days 7 days 28 days Fig.-8: Comparison of compressive strength of conventional and marine algae concrete Three numbers of the sample in each of concrete were subjected to testing using the compression-testing machine. The result of the average strength of cylinders is shown in Table-2 and the comparison of split tensile strength of conventional concrete with that of marine algae concrete is illustrated using bar chart in Fig.-9.The strength increased with the number of days of curing. The maximum split tensile strength attained was 4.6 N/mm 2 for 8% addition of marine algae at the end of 28 days. Table-2: Split tensile strength results for conventional concrete and marine algae concrete No. of days Percentage addition of Marine algae 2% 5% 8% 10% Conventional Concrete
7 Split Tensile strength (N/mm 2 ) % 2% 5% 8% 10% Percentage addition of Marine algae 3 days 7 days 28 days Fig.-9: Comparison of tensile strength of conventional Vs marine algae concrete Flexural Strength Three numbers of the sample in each of concrete were subjected to testing using the compression-testing machine. The result of the average strength of flexure beams is shown in Table- 3 and the comparison of the flexural strength of conventional concrete with that of marine algae concrete is illustrated using line graph in Fig.-10. The maximum flexural strength attained was 4.7 N/mm 2 for 8% addition of marine algae. Table-3: Flexural strength results for conventional concrete and marine algae concrete Flexural Strength (N/mm 2 ) Description 28 Days Conventional 3.6 N/mm 2 2% addition of marine algae 3.9 N/mm 2 5% addition of marine algae 4.3 N/mm 2 8% addition of marine algae 4.7 N/mm 2 10% addition of marine algae 4.5 N/mm 2 Impact strength The samples in each concrete were subjected to testing using the drop weight impact test. The maximum number of blows for the first crack and failure was 94 and 96 for 8% addition of marine algae in concrete. The results of impact strength of concrete are shown in Table-4. Young s modulus The sample in each of concrete was subjected to testing using the compression-testing machine with fixing the compressometer. The test setup is shown in Fig.-11 and the results of the modulus of elasticity of concrete are shown in Table
8 Flexural Strength (N/mm²) % 2% 4% 6% 8% 10% 12% Percentage addition of Marine algae 28 days Fig.-10: Comparison of flexural strength of conventional Vs marine algae concrete Table-4: Impact strength results for conventional concrete and marine algae concrete S.No Description Impact Strength in blows Initial crack Failure 1 Conventional concrete % addition of marine algae % addition of marine algae % addition of marine algae % addition of marine algae Fig.-11: Young s modulus setup 713
9 Table-5: Young s modulus results for conventional concrete and marine algae concrete Description Young s modulus in Mpa Conventional Concrete 1.34 x % addition of marine algae 1.42 x % addition of marine algae 1.51 x % addition of marine algae 1.58 x % addition of marine algae 1.46 x 10 4 Deflection characteristics The deflection of the long beams were studied with the help of crack forming with respective the load applied and the deflection of the beam at the midpoint of the beam. The maximum deflection of the conventional concrete is 13 mm at 9.6 tonnes of load and for optimum mix the maximum deflection is 7.43 mm at 11.2 tonnes of load.the initial crack in CC beam starts at 2.4 tonnes and for OM beam it starts at 3.6 tonnes. The CC beam cracks at the shear portion of the beam (at supports), this shear failure was arrested in the OM beam. The cracks formation was uniform (all over the beam) in the OM beam, comparatively the CC beams crack formation is not in uniform (more at supports) the specimens with the crack formation. Fig.-12 shows the specimen under testing and Fig.-13 shows the tested beam specimen. Fig.-14 show the deflection crurve for both the CC and OM beams. Fig.-12: Specimen under testing Fig. -13: Tested beam specimen CONCLUSION Following are the important results arrived from this study and they are; The 8% adition of marine algae in concrete gives the optimum result.the optimum mix gives 20%, 20%, and 25% increase in compression strength, split tensile strength and flexural strength respectively when compared with conventional concrete.the optimum mix concrete beam sustains 15% higher load compare to the conventional concrete beam. ACKNOWLEDGEMENT The authors wish to thank the SRM University Management, for their support to complete this study and those who were directly or indirectly involved in this study. 714
10 Load (kn) Deflection (mm) Fig.-14: Load Vs Deflection curve for CC and OM beams CC OM REFERENCES 1. M. Schneider, M. Romer, M.H. Tschudin, Cem. Concr. Res., 41, 642 (2011). 2. M. Collepardi, Cement Concrete Composite, 20, 103 (1998). 3. J. Dransfield, J. Newman, B.S. Choo, Butterworth-Heinemann, Constituent Materials (2003). 4. F.M. Leon-Martinez, P.F. de J. Cano-Barrita, Elsevier, 65, 11(2014). 5. M. Lachemi, K.M.A.Hossain, V. Lambros, C. Nkinamubanzi, N. Bouzoubaâ, Cem. Concr. Res., 34, 917 (2004). 6. V. M. Malhotra, American Concrete Institute, 73, 628 (1976). 7. J. Plank, Appl. Microbiol. Biotechno., 66, 9 (2004). 8. IS: 2386 (Part-1), Indian Standard for Methods of Test for Aggregates for Concrete Particle Size and Shape (1963). 9. IS: 12269, Indian Standard for Specification for 53 Grade OPC, Reaffirmed January (1987). 10. IS: 383, Indian Standard for Specification for Coarse Aggregates and Fine Aggregates from Natural Sources for Concrete. (1970). 11. IS: 10262, Concrete Mix Design, Indian Standard Institution, New Delhi, (1982). [RJC-1436/2016] 715
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