Dr. K.V. Krishna Reddy. International Journal of Engineering Research and Applications www.ijera.com ISSN: 2248-9622, Vol. 10, Issue 5, (Series-II) May 2020, pp. 51-53 www.ijera.com DOI: 10.9790/9622-1005025153 51 | Page Influence of Organic Additives on Mechanical Properties of Concrete Dr. K.V. Krishna Reddy Professor, MGIT, Hyderabad, Telangana, India Abstract: Presence of voids in microstructure effects the strength of concrete and hence durability. The present work is an attempt to evaluate the effect of Trigonella foenum-graecum, .an organic additive commonly called as fenugreek and Cyamopsis tetragonoloba commonly called as gaur gum as additives on mechanical properties of concrete. 0.2% of Trigonella foenum-graecum when used as additive to cement yielded promising results. Keywords: Organic additives, microstructure, gaur, fenugreek. --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 08-05-2020 Date of Acceptance: 22-05-2020 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION Concrete is the most flexible material before setting which when hardens provides the necessary strength and help in creating civil wonders. To enhance the preset and post-set properties of concrete use of chemical admixtures has become unavoidable. However they also cause pollution. In this regard an attempt is made to evaluate organic admixtures to improve properties of concrete. M20, M25 and M30 grade concretes are designed and the organic materials namely Trigonella foenum-graecum and Cyamopsis tetragonoloba are used as additives to cement to evaluate the mechanical strength properties of different grades of concrete. II. LITERATURE REVIEW Prior et.al. [3] in their work have mentioned that admixtures are the surface-active agents which help in dispersion of cement particles and thereby creating greater mobility and avoid water to influence formation of flocculated system. Izaguirre et al [4]. presented the effect of work on potato starch as a modifier in lime-based mortars. Chandra.S.et.al [5] highlighted that use of cactus extract in Portland cement mortars increase resistance to freeze and thaw. Indrajith ray et.al.[6] showed that milk of rubber can be used in combination with superplasticizer or individually in Portland cement mortars. Chandra.S.et.al [7] reported use of black gram in mortar and concrete. III. MATERIALS USED 53 grade cement procured locally is used in this experimental work. Fine aggregate confirming to to zone II of Indian standard [2] and 20mm down coarse aggregate from granite source is used.. Water, of potable quality confirming to standards is used. Organic materials namely Trigonella foenum- graecum is used in powder form and is a water soluble poly saccharides with sapogenins. Sapogenins is steroid linked to glycosides, usually through 3B Hydoxyl group which exhibits surfactant properties. Cyamopsis tetragonoloba is a ploy saccharide, that is high on galactose and mannose and has ability to hydrate rapidly in cold water to attain uniform and very high viscousity at relatively low concentration and is a effective thickener and stabilizer. IV. METHODOLOGY Concrete mix design for M20, M25 qnd M30 grade concretes is done in confirmation with IS 10262-2009 [1] with a w/c ratio of 0.5. Experimental work includes evaluating strength properties of concrete namely, compressive and tensile. 150mm size cubes and cylinders of 150mm X 300mm were cast and cured for 28 days to determine the mechanical strength properties. Trigonella foenum-graecum and Cyamopsis tetragonoloba are added at 0.1%, 0.2 and 0.3% as additive to cement separately for all the three grades of concrete. 18 cubes and 9 cylinders are cast for each combination and are tested for 28-day strength. V. RESULT AND DISCUSSION The 28 days compressive strength of the concrete with different percentages of additive for all the grades of concrete are as depicted in Table1 and Table2 . Tensile strength of all grades with and RESEARCH ARTICLE OPEN ACCESS