International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 08 | Aug 2019
p-ISSN: 2395-0072
www.irjet.net
Experimental Study on Partial Replacement of Cement by GGBS and Fine Aggregate by Robo Sand for M25 Grade Concrete Mallesh M1, Sajidulla jamkhani2, Nandeesh M3 1Associate
Professor, Dept of Civil Engineering, UBDT, Davanagere-577004, Karnataka, India Student, Depot of Civil Engineering, UBDT, Davangere-577004, Karnataka, India 3Asst professor, Dept of Civil Engineering, BITS, Warangal-506331, Telangana, India ---------------------------------------------------------------------***--------------------------------------------------------------------2PG
Abstract - Concrete is a compound material made from cement, water, fine aggregate and coarse aggregate. But present researchers are in significance of finding different alternative materials to produce concrete, Now a days construction industry in india is facing one of the major problem that is Natural sand, and the government of Karnataka banned on excavation of fine aggregate from river bed, The non availability or shortage of river sand will affect the construction industry, hence there is a need to find the different alternative material to replace the River sand, Such that excess river bed erosion and harm to environment is prevented. Hence in the current study partial replacement of cement with GGBS and River sand with Robo sand considered. Experimental study is carried out to evaluate the strength characteristics of hardened concrete. Properties of concrete have been determined by partially replacing cement with GGBS and sand with Robo sand. The cement has been replaced by GGBS accordingly in the range of 0%, 5%, 10%, 15%, 20%, and 25% by weight of cement. And River sand has been replaced by Robo sand accordingly in the range of 0%, 10%, 20%, 25%, & 30% by weight of Sand for every replacement of GGBS for M25 grade mix. Concrete cubes were casted and tested after 7 days and 28 days curing for compressive strength and compared with Compressive strength of control cubes specimen. So that optimum percentage of GGBS and Robo sand are to be determined Key Words: Ground Granulated Blast Furnace Slag (GGBS), Robo Sand (RS), Natural River Sand, Ordinary Portland Cement (OPC), Compressive Strength 1. INTRODUCTION The global consumption of natural sand is very high, due to the extensive use of concrete or mortar. In general, the demand of natural sand is quite high in developing countries to satisfy the rapid infrastructure growth, in this situation developing country like India facing shortage in good quality natural sand Particularly in India, natural sand deposits are being depleted and causing serious threat to environment as well as the society. The most commonly used fine aggregate is natural river or pit sand. Fine and coarse aggregate constitute about 75% of total volume. It is therefore, important to obtain right type and good quality aggregate at site, because the aggregate forms the main matrix of concrete or mortar. Š 2019, IRJET
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2. MATERIALS AND METHODOLOGY 1. Cement: In present work Ultra tech 43 grade OPC is used for all concrete mixes. to know the properties of cement some test has been done. The cement used was fresh and without any lumps. The testing of cement was done as per IS 8112: 2013. Table 1: Test results on Cement SI.NO 1 2 3 4 5 6
Particulars Initial setting time Final setting time Normal consistency (%) Specific gravity Soundness test Fineness
Test Results 49 minutes 380 minutes 29% 2.64 2mm 3%
2. Fine aggregate: Locally available natural river sand is used as Fine aggregates. The sand passing through 4.75 mm size IS sieve is used in the preparation of specimens. As per IS: 383-1970 recommendation. The results have been tabulated in table 2. Table 2: Test Results of Fine Aggregate Fineness Modulus Specific Gravity Grading Zone as per IS:383-1970
3.15 2.65 Zone-I
3. Coarse aggregate: The material whose particles are of size as are retained on IS. Sieve 4.75 mm is termed as coarse aggregate. The crushed aggregates were collected from the local quarry, 20mm and 12.5mm down size are used as coarse aggregate in this experiment. Both aggregates are blended in equal proportion and tests were carried on the aggregates as per IS:383-1970 to form well graded aggregates. Sieve analysis of coarse aggregates as tabulated in table 3.
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