Final setting time 260 min 32 fine aggregates the

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Final Setting Time 260 min. 3.2. Fine Aggregates The sand which was locally available and passing through 4.75mm IS sieve size was used as fine aggregate. The physical properties of the fine aggregates are as listed in table below: Table-2: Physical Properties of Fine Aggregates Properties Test Values Specific Gravity 2.60 Water Absorption 1% Fineness Modulus 2.5 3.3. Coarse Aggregates The coarse aggregates with nominal maximum size of aggregates as 20mm (60%) and 10mm (40%) as per Indian standard were used. The physical properties of the coarse aggregates are as listed in table below: Table-3: Physical Properties of Coarse Aggregates Properties CA-20 CA-10 Type Crushed Crushed Specific Gravity 2.65 2.70 Water Absorption 0.50% 0.50% Fineness Modulus 6.8 6.5 3.4. Fly Ash The fly ash used was of class F with specific gravity of 2.10. 3.5. Water The water used for experiments was potable water.
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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 317 4. METHODOLOGY The aim of the present study was to study the effect of fly ash on compressive strength of concrete by partial replacement of cement with 0%, 10%, 20% and 30% of fly ash. The concrete mix of M20 grade was prepared as per IS10262:2009 having mix design ratio as 1:1.4:2.96 and w/c ratio of 0.50. To carry out the experimental investigation total 24 cubes of size 150mm x 150mm were casted. 6 cubes were casted to determine the compressive strength of normal concrete with no fly ash. Similarly, each set of 6 cubes were casted to determine the compressive strength for 10%, 20% and 30% replacement of cement with fly ash respectively. From these 6 cubes, 3 cubes were utilized to determine the compressive strength of concrete after 7 days of curing and rest 3 cubes were used to determine the compressive strength of concrete at 28 days. Compression Testing Machine of 2000kN capacity was used to determine the total compressive load taken by concrete at different ages. This ultimate load divided by the cross-sectional area of the cube (150mm x 150mm) yields the compressive strength of concrete. Figure-1: Curing of specimens Figure-2: Specimen testing in Compression Testing Machine Table-4: Material Quantities for Mix Design Fly Ash (%) No. of cubes Cement (kg) Fine Aggregate (kg) Coarse Aggregate (kg) CA10 CA20 0 6 9.24 12.94 16.416 10.944 10 6 8.32 12.94 16.416 10.944 20 6 7.4 12.94 16.416 10.944 30 6 6.47 12.94 16.416 10.944 5. RESULTS AND DISCUSSIONS Each set of 3 cubes of M20 grade of concrete were tested in Compression Testing Machine with 0%, 10%, 20% and 30% replacement of cement with fly ash to determine the compressive strength after 7 and 28 days of curing. Average value of these 3 readings gives the average compressive strength of concrete. The average compressive strength of cubes at the age of 7 days and 28 days were found as 13.86 N/mm² and 20.58 N/mm² for normal concrete with no fly ash and it reduced to 10.11 N/mm² and 16.35 N/mm² when 30 % of cement was replaced with fly ash. The decrease in compressive strength of concrete after 28 days of curing was
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