Coarse Aggregate Specifications PDF

APPENDIX APPENDIX APPENDIX RESULTS ‘A’ ‘B’ ‘C’ Results from Minimize Percentage of Determination the tests maximum sieve dry aggre...

APPENDIX APPENDIX APPENDIX RESULTS ‘A’ ‘B’ ‘C’ Results from Minimize Percentage of Determination the tests maximum sieve dry aggregate of ten percent loads. fine value Ensure sieve Test sample, isn't overloaded. Test procedure COURSE AGGREGATE APPENDIX DIPTEE GAHANE - 7TH SEM ‘A’ SARA YELNE - 7TH SEM ‘B’  APPENDIX ‘A’ The sample weight obtained frequently necessitates many procedures on a cach sieve. Each sieve should be run independently I.S. SIEVE DESIGNATION MAXIMUM WEIGHT FOR 45CM DIA. SIEVE [KG] MAXIMUM WEIGHT FOR 30CM DIA. SIEVE [KG] over a clean tray or receiver for no 45MM 10 4.5 more than a trace, but no less than 40MM 8 3.5 two minutes in any case. Materials 31.5 MM OR 22.1 MM 6 2.5 should not be pushed through the 20MM 4 2.0 openings; nevertheless, hand 16 MM OR 12.5 MM 3 1.5 placement is permissible. To clean 10MM 2 1.0 the fine sieves, use a soft brush. The 5.6MM 1.5 0.75 cumulative weight passing through 4.75MM 1.0 0.50 each sieve should be computed as a 0.35MM - 0.30 percentage of the total sample weight, rounded to the closest whole number.  2 1 The wet aggregate is heated in a frying pan, stirred with a Take a sample of APPENDIX ‘B’ wet aggregate and glass rod, and weighed to remove surface moisture. weigh this sample Percentage of dry aggregate The aggregate loses its shine and let us say its and becomes dull, then weight is 'X' weighed to determine its weight ‘Y’ 4 3 The surface moisture = The sample aggregate 100 x X-Y is heated in a frying Z pan until all moisture this is expressed as evaporates, then percentage of dry removed and weighed aggregate to determine its weight, denoted as 'Z'.  1 Steel cylinder 2 Sieves (12.5mm,10mm) 3 APPENDIX ‘C’ Cylindrical metal measure To conduct the standard test ,apparatus required 4 Tamping Rod 5 Balance (0-10kg) 6 Compression testing machine  APPENDIX ‘C’ Procedure 2 4 The test sample in the cylinder with After the maximum specified the plunger in position is placed in load is reached, the load is 1 the compression testing machine. released and the aggregate The cylindrical measure is The load is applied at a uniform rate from the cylinder is sieved filled by the test sample of so as to cause a total penetration of from 2.36mm IS sieve. 5 aggregate in three layers the plunger of about 20mm for of approximately equal normal crushed aggregates in 10 3 The fines passing For rounded or partially 2.36mm.IS sieve is depth, each layer being minutes. rounded aggregates, the load weighed and expressed tamped 25 times. required to cause a total as a percentage of by penetration of 15mm is applied weight of the test where as for honeycombed sample. aggregates a penetration of 24mm is applied in 10 minutes.  APPENDIX ‘C’ Calculations , Safety & precautions , Report 1 2 3 Calculations Safety & Precautions Report The mean percentage fines Use hand gloves while removing The load required to produce from the two tests at this load containers from oven after switching 10% fines is reported to the shall be used in the following off the oven. nearest whole number for formula to calculate the load Use safety shoes & aprons at the time loads of 10 tones or more, required to give 10% fines. of test. the nearest 0.5 tones for Load required for 10% fines Before testing machine should be loads of less than 10 tones. = 14x / (y + 4) checked. x = load in tones After test electric supply should be off. y = mean percentage fines Thoroughly clean & dry the container from two tests at x tone load. before testing. All parts of the equipments should always be clean.  APPENDIX ‘C’ Results 1 2 The value expressed to the nearest 0.5 tonne should be as The load required to produce 10 percent fines shall be reported to the follows: nearest whole number for loads of 10 tonnes or more, the nearest 0.5 (a) For normal concrete, not less than 5 tonnes. tonne for loads of less than 10 tonnes, (b) For wearing surfaces, not less than 10 tonnes, (c) For granolithic concrete, not less than 15 tonnes. THANK YOU