Sieve Analysis Test Lab Report Essay

Aggregate is one of the basic constituents of concrete - Sieve Analysis Test Lab Report Essay introduction. Its quality is of considerable importance because about three-quarter of the volume of concrete is occupied by aggregates. One of the physical properties of aggregate that influence the property of concrete is the grading of aggregate. The grading of aggregate defines the proportions of particles of different size in the aggregate. The grading of fine (size < 5 mm) and coarse (size > 5 mm) aggregates are generally required to be within the limits specified in BS 882: 1992. OBJECTIVE

The objective of this experiment is to obtain the grading curve for both fine and coarse aggregate. APPARATUS 1. Balance – balance or scale used in testing fine and coarse aggregates shall have readability and accuracy as follows: For fine aggregate, readable to 0. 1 g and accurate to 0. 1 g or 0. 1 % of the test load. For coarse aggregate, or mixtures of fine and coarse aggregate, readable and accurate to 0. 5 g or 0. 1 % of the test load. 2. Sieves – the sizes and apertures appropriate to the specification of the material being tested, complying with BS 410: For coarse aggregate, standard sieve size of 50. mm, 37. 5 mm, 20. 0 mm, 14. 0 mm, 10. 0 mm, 5. 0 mm and 2. 36 mm (Fig. 2C1-1). For fine aggregate, standard sieve size of 10 mm, 5. 00 mm, 2. 36 mm, 1. 18 mm, 600m, 300 m and 150 m (Fig. 2C1-2). 3. Mechanical Sieve Shaker -a mechanical sieving device, used to create vibration of the sieve to cause the particles to bounce. 4. Oven – an oven of appropriate size capable of maintaining a uniform temperature of 105°±5°C. PROCEDURES Fine Aggregate 1. Representative sample was chosen by quartering (according to BS 812: Part 102: 1984) or by use of a sample splitter (Fig. 2C1-3).

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The sample to be tested should be the approximate weight desired when dry. For this experiment, about 500 grams of fine aggregate was weighed. 2. The samples was dried to constant weight in the furnace at a temperature of 105° ±5° C. 3. The samples was cooled down. The desired sieves was nested in order of decreasing aperture size from top to bottom. 4. The sample was placed on the top sieve and the sieves was agitated by mechanical sieve shaker for a sufficient period so that after completion, not more than one percent by weight of the residue on any individual sieve will pass that sieve. 5.

The weight of each size increment was determined by weighing the residue contained on each sieve. This has be done in a cumulative fashion by starting with the smallest, particles in the bottom pan. After this weight has been determined, the next larger particles was added into the same pan and the cumulative weight was determined. Coarse Aggregate 1. A representative sample was chosen by quartering (according to BS 812: Part 102: 1984) or by use of a sample splitter (Fig. 2C1-3). The sample to be tested should be the approximate weight desired when dry. For this experiment, about 3 kilograms of coarse aggregate was weighed. . The procedure no. 2 to 5 was repeated as stated for fine aggregate using appropriate sieve size. DATA AND ANALYSIS A. Fine aggregate sample weight : 500g BS sievesize| Weightof seive(gm)| Weight of Sieve + Sample (gm)| Retained Weight(gm)| Passed Weight(gm)| Retained Percentage(%)| Passed Percentage(%)| 5mm| 760| 770| 10| 490| 2| 98| No. 7(2. 36mm)| 736| 814| 78| 412| 15. 6| 82. 4| No. 14(1. 18mm)| 653| 791| 138| 274| 27. 6| 54. 8| No. 25(600m)| 633| 753| 120| 154| 24. 0| 30. 8| No. 52(300m)| 574| 657| 83| 71| 16. 6| 14. 2| No. 100(150m)| 553| 600| 47| 24| 9. 4| 4. 8| Pan| 541| 565| 24| 0| 4. | 0. 0| CALCULATION: For 5mm BS sieve size of fine aggregate, Retained weight (gm) = (weight of sieve + sample) – (weight of sieve) = 770 g – 760 g = 10 g Passed weight (gm) = (actual weight) – (retained weight) = 500 g – 10 g = 490 g Retained percentage (%) = (retained weight) ? (actual weight) ? (100 %) = (10 ? 500) ? 100 % = 2 % Passed percentage (%) = ((passed weight) ? (actual weight) ? (100 %) = (490 ? 500) ? 00 % = 98 % B. Coarse aggregate sample weight : 2005 g BS Sieve Size| Weight of Sieve (gm)| Weight of Sieve + Sample (gm)| Retained Weight (gm)| Passed Weight (gm)| Retained Percentage (%)| Passed Percentage (%)| 37. 5 mm| 1096| 1096| 0| 2005| 0| 100| 20. 0 mm| 1104| 1396| 292| 1713| 14. 56| 85. 44| 14. 0 mm| 1226| 1904| 678| 1035| 33. 82| 51. 62| 10. 0 mm| 1217| 1638| 421| 614| 20. 99| 30. 62| 5. 0 mm| 1068| 1406| 338| 276| 16. 86| 13. 77| 2. 36 mm| 1029| 1125| 96| 180| 4. 79| 8. 98| Pan| 790| 970| 180| 0| 8. 98| 0| CALCULATION: For 37. mm BS sieve size of fine aggregate, Retained weight (gm) = (weight of sieve + sample) – (weight of sieve) = 1096 g – 1096 g = 0 g Passed weight (gm) = (actual weight) – (retained weight) = 2005 g – 0 g = 2005 g Retained percentage (%) = (retained weight) ? (actual weight) ? (100 %) = (0 ? 2005) ? 100 % = 0 % Passed percentage (%) = (passed weight) ? (actual weight) ? (100 %) = (2005 ? 2005) ? 100 % = 100 % COMMENT : 1.

The sample of coarse aggregate that we took has a mixture of gravel and sand. So, some of the sample will passing through the 2. 36 mm BS sieve size. It also affect our graph and make it look slightly different from the actual graph or curve. 2. The weight of our sample that passing 37. 5 mm that we get more 5 g. It is because the balance is not exactly 0. 000 g during initial weight or it is because of natural or environmental factors. PRECAUTION : 1. Make sure that we choose the gravel carefully during coarse aggregate part to get a best curve when plot it on graph. . We must make sure that the weighing balance is exactly 0. 000 g before we put a sample or sieve on it to eliminated the systematic error. 3. We must make sure that there is no previous experiment sample inside the sieve before starting the experiment because this can affect our actual weighing value. CONCLUSION : As a conclusion ,the line grading curve for both fine and coarse aggregate graph is slightly different compared to standard or actual curve.

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