{"id":1850,"date":"2020-03-24T07:31:38","date_gmt":"2020-03-24T07:31:38","guid":{"rendered":"https:\/\/seismicconsolidation.com\/?p=1850"},"modified":"2020-03-24T07:31:38","modified_gmt":"2020-03-24T07:31:38","slug":"to-perform-los-angeles-abrasion-test-on-aggregate","status":"publish","type":"post","link":"https:\/\/seismicconsolidation.com\/to-perform-los-angeles-abrasion-test-on-aggregate\/","title":{"rendered":"To perform LOS ANGELES Abrasion test on aggregate"},"content":{"rendered":"<p><strong>Job # 4:<\/strong><\/p>\n<p><strong>To perform LOS ANGELES Abrasion test on aggregate<\/strong><\/p>\n<p><strong><u>Code description:<\/u><\/strong><\/p>\n<p><strong>ASTM<\/strong> C 131\/C 131 M-14 and <strong>AASHTO <\/strong>T-96<\/p>\n<p><strong><u>Scope &amp; Significance:<\/u><\/strong><\/p>\n<p>This test method covers a procedure for testing of coarse aggregates for resistance to degradation using the Los Angeles Abrasion testing machine.<\/p>\n<ul>\n<li>Due to the movement of traffic, the road stones used in the surfacing course are subjected to wearing action at the top. Resistance to wear or hardness is hence an essential property for road aggregates, especially when used in wearing course. Thus, road stones should be hard enough to resist the abrasion due to traffic. When fast moving traffic fitted with pneumatic tyres move on the road, the soil particles present between the wheel and road surface causes abrasion on the road stone. Steel tires of animal drawn vehicles, which rub against the stones, can cause considerable abrasion of the stones on the road surface. Hence in order to test the suitability of road stones to resist the abrasion action due to traffic, tests are carried out in the laboratory.<\/li>\n<li>Los Angeles abrasion test is used to find out the % wear due to relative rubbing action between aggregate and steel balls used as abrasive charges. Pounding action of these balls also exists while conducting the test. The test is considered more dependable as rubbing and pounding action simulate field conditions.<\/li>\n<\/ul>\n<p><strong><u>Related theory:<\/u><\/strong><\/p>\n<p><strong>Abrasion:<\/strong><\/p>\n<p>\u201cResistance of a material against wear, scratching or degradation is known as abrasion\u201d<\/p>\n<p><strong>Pounding action:<\/strong><\/p>\n<p>\u201cStriking action of an object on a surface for a short instant of time is called pounding action\u201d<\/p>\n<p><strong>Los Angeles Abrasion test:<\/strong><\/p>\n<p>The principle of Los Angeles abrasion test is to find the percentage wear due to relative rubbing action between aggregates and steel balls used as abrasive charge. The pounding action of these balls also exits while conducting the test. Some investigators believe this test to be more dependable as rubbing and pounding action simulate the field conditions where both abrasion and impact occur. Los Angeles abrasion test has been standardized by the ASTM and AASHTO. Standard specifications of Los Angeles abrasion values are also available for various types of pavement constructions.<\/p>\n<p><strong>Los Angeles abrasion value:<\/strong><\/p>\n<p>\u201cIt is an indicative of the abrasion strength of the aggregates\u201d<\/p>\n<p>It can be computed by using the relationship:<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-1852\" src=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/l-1.png\" alt=\"\" width=\"650\" height=\"64\" srcset=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/l-1.png 650w, https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/l-1-300x30.png 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/p>\n<p><strong>Loss Angeles Abrasion machine<\/strong>:<\/p>\n<p>It consists of a hollow steel cylinder closed at both ends, having inside diameter of 28\u201d and length of 20\u201d. The cylinder is mounted on stub shafts in such a way that it rotates about horizontal axis at 30-33 rpm.<\/p>\n<p>An opening in cylinder with dust tight cover is provided for the introduction of test sample. A steel shelf extending full length of the cylinder and projecting 3.5\u201d inward is mounted on interior surface of the cylinder.<\/p>\n<p>The machine should be driven to produce 30-33 rpm.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-1853\" src=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/m.jpg\" alt=\"\" width=\"740\" height=\"861\" srcset=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/m.jpg 740w, https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/m-258x300.jpg 258w, https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/m-300x349.jpg 300w\" sizes=\"(max-width: 740px) 100vw, 740px\" \/><\/p>\n<p style=\"text-align: center;\"><strong><em>Los Angeles testing machine<\/em><\/strong><\/p>\n<p><strong><u>Apparatus:<\/u><\/strong><\/p>\n<ol>\n<li>Los Angeles Abrasion machine<\/li>\n<li>Coarse sieve shaker including standard sieves sizes<\/li>\n<li>Weighing balance<\/li>\n<li>Sieve # 12<\/li>\n<li>Abrasive charges, \u00d8 = 1 27\/32\u201d, m =390-445g, approximately 439.6g<\/li>\n<\/ol>\n<p><strong><u>Procedure: <\/u><\/strong><\/p>\n<ul>\n<li>Sieve the sample in the coarse sieve shaker.<\/li>\n<li>Clean the aggregates and dry them in an oven at 105-110\u00b0C to constant weight. Conforming to anyone of the grading A to D or 1-3 as per table (a).<\/li>\n<li>The grading or gradations used in the test should be nearest to the grading to be used in the construction.<\/li>\n<li>Aggregates weighing 5 kg for grading A. B, C or D and 10 kg for grading 1, 2, or 3 may be taken as test specimen and placed in the testing cylinder.<\/li>\n<li>The abrasive charge is also chosen in accordance with table (b) depending on the grading of the aggregate and is placed in the cylinder of the machine.<\/li>\n<li>The cover is then fixed dust-tight.<\/li>\n<li>The machine is rotated at a speed of 30 to 33 revolutions per minute.<\/li>\n<li>The machine is rotated for 500 revolutions for gradations A. B, C and D, for gradations 1,2 and 3, it shall be rotated for 1,000 revolutions.<\/li>\n<li>The machine should be balanced and driven in such a way as to maintain uniform peripheral speed.<\/li>\n<li>After the desired number of revolutions, the machine is stopped and the material is discharged from the machine taking care to take out entire stone dust.<\/li>\n<li>Using a sieve # 12, the material is sieved and the material that is retained on sieve 3 12 is weighed.<\/li>\n<\/ul>\n<p><strong>Table (a) Grading of test samples:<\/strong><\/p>\n<table style=\"width: 100%;\" width=\"100%\">\n<tbody>\n<tr>\n<td style=\"width: 28.6667%;\" colspan=\"2\" width=\"19%\"><span style=\"font-size: 10pt;\"><strong>Sieve Size (Square Openings)<\/strong><\/span><\/td>\n<td style=\"width: 70.3939%;\" colspan=\"7\" rowspan=\"2\" width=\"80%\"><span style=\"font-size: 10pt;\"><strong>Mass of Indicated Sizes, g<\/strong><\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" rowspan=\"2\" width=\"9%\"><span style=\"font-size: 10pt;\"><strong>Passing<\/strong><\/span><\/td>\n<td style=\"width: 13.4849%;\" rowspan=\"2\" width=\"9%\"><span style=\"font-size: 10pt;\"><strong>Retained on<\/strong><\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\"><strong>A<\/strong><\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\"><strong>B<\/strong><\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\"><strong>C<\/strong><\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\"><strong>D<\/strong><\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\"><strong>1<\/strong><\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\"><strong>2<\/strong><\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\"><strong>3<\/strong><\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">76.2 mm (3 in)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">63.5 mm (2<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 50<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">63.5 mm (2<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">50.8 mm (2 in)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 50<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">50.8 mm (2 in)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">37.5 mm (1<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 50<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 50<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">37.5 mm (1<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">25.0 mm (1 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">1 250 \u00b1 25<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 25<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 25<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">25.0 mm (1 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">19.0 mm (<sup>3<\/sup>\u20444 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">1 250 \u00b1 25<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 25<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">19.0 mm (<sup>3<\/sup>\u20444 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">12.5 mm (<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">1 250 \u00b1 10<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 10<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">12.5 mm (<sup>1<\/sup>\u20442 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">9.5 mm (<sup>3<\/sup>\u20448 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">1 250 \u00b1 10<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 10<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">9.5 mm (<sup>3<\/sup>\u20448 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">6.3 mm (<sup>1<\/sup>\u20444 in.)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 10<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">6.3 mm (<sup>1<\/sup>\u20444 in.)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">4.75-mm (No. 4)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">2 500 \u00b1 10<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\">4.75-mm (No. 4)<\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\"><span style=\"font-size: 10pt;\">2.36-mm (No. 8)<\/span><\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 10<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">&#8230;<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 15.1818%;\" width=\"9%\"><span style=\"font-size: 10pt;\"><strong>Total<\/strong><\/span><\/td>\n<td style=\"width: 13.4849%;\" width=\"9%\">&nbsp;<\/td>\n<td style=\"width: 11.7575%;\" width=\"12%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 10<\/span><\/td>\n<td style=\"width: 10.4849%;\" width=\"10%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 10<\/span><\/td>\n<td style=\"width: 9.54541%;\" width=\"11%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 10<\/span><\/td>\n<td style=\"width: 8.78785%;\" width=\"10%\"><span style=\"font-size: 10pt;\">5 000 \u00b1 10<\/span><\/td>\n<td style=\"width: 10.5152%;\" width=\"11%\"><span style=\"font-size: 10pt;\">10 000 \u00b1 100<\/span><\/td>\n<td style=\"width: 9.39392%;\" width=\"10%\"><span style=\"font-size: 10pt;\">10 000 \u00b1 75<\/span><\/td>\n<td style=\"width: 9.90908%;\" width=\"11%\"><span style=\"font-size: 10pt;\">10 000 \u00b1 50<\/span><\/td>\n<td style=\"width: 1.21212%;\" width=\"0\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><strong>Table (b) No. of abrasive charges for the above grading:<\/strong><\/p>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td rowspan=\"2\" width=\"25%\"><strong>Abrasive charges<\/strong><\/td>\n<td rowspan=\"2\" width=\"25%\"><strong>No. of revolutions<\/strong><\/td>\n<td rowspan=\"2\" width=\"21%\"><strong>No. of spheres<\/strong><\/td>\n<td width=\"27%\"><strong>Weight of charges<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"27%\"><strong>g<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">A<\/td>\n<td width=\"25%\">500<\/td>\n<td width=\"21%\">12<\/td>\n<td width=\"27%\">5 000 \u00b1 25<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">B<\/td>\n<td width=\"25%\">500<\/td>\n<td width=\"21%\">11<\/td>\n<td width=\"27%\">4 584 \u00b1 25<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">C<\/td>\n<td width=\"25%\">500<\/td>\n<td width=\"21%\">8<\/td>\n<td width=\"27%\">3 330 \u00b1 20<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">D<\/td>\n<td width=\"25%\">500<\/td>\n<td width=\"21%\">6<\/td>\n<td width=\"27%\">2 500 \u00b1 25<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">1<\/td>\n<td width=\"25%\">1000<\/td>\n<td width=\"21%\">12<\/td>\n<td width=\"27%\">5 000 \u00b1 25<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">2<\/td>\n<td width=\"25%\">1000<\/td>\n<td width=\"21%\">12<\/td>\n<td width=\"27%\">5 000 \u00b1 25<\/td>\n<\/tr>\n<tr>\n<td width=\"25%\">3<\/td>\n<td width=\"25%\">1000<\/td>\n<td width=\"21%\">12<\/td>\n<td width=\"27%\">5 000 \u00b1 25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><strong><u>Observations &amp; Calculations<\/u><\/strong><\/p>\n<p>Grading used for the test\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = B<\/p>\n<p>Number of abrasive charges used\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = 11<\/p>\n<p>Original weight of sample,\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = 5 000g<\/p>\n<p>Final weight of sample that is retained on sieve # 12,\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = 3 773g<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-1854\" src=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/n.png\" alt=\"\" width=\"666\" height=\"116\" srcset=\"https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/n.png 666w, https:\/\/seismicconsolidation.com\/wp-content\/uploads\/2020\/03\/n-300x52.png 300w\" sizes=\"(max-width: 666px) 100vw, 666px\" \/><\/p>\n<p><strong>Limiting values of LAA:<\/strong><\/p>\n<p>Larger the LAA value, softer will be the aggregate and smaller the value, harder will be the aggregate.<\/p>\n<p>For <strong>wearing surface<\/strong> use the value 10 % from (0% &#8211; 10%), this is because even though 0 % will provide a good hard surface but its coefficient of friction will be too high that it will severely damage the tires.<\/p>\n<p>For <strong>sub grade, sub base and base coarse<\/strong>, provide aggregate of lower LAA value to provide hardness.<strong>\u00a0 <\/strong><\/p>\n<p><strong>According to AASHTO T 96:<\/strong><\/p>\n<p>For <strong>sub-base<\/strong>, the coarse aggregate should have a % wear by the Los Angeles abrasion not more than 50 %<\/p>\n<p>For <strong>base coarse<\/strong>, the coarse aggregate should have a % wear by the Los Angeles abrasion not more than 40 %<\/p>\n<p><strong><u>Comments:<\/u><\/strong><\/p>\n<p>The LAA value of our sample is 25 %, hence it can be used in sub base, base coarse and wearing surface.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Job # 4: To perform LOS ANGELES Abrasion test on aggregate Code description: ASTM C 131\/C 131 M-14 and AASHTO T-96 Scope &amp; Significance: This test method covers a procedure for testing of coarse aggregates for resistance to degradation using the Los Angeles Abrasion testing machine. Due to the movement of traffic, the road stones&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[145],"tags":[172],"_links":{"self":[{"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/posts\/1850"}],"collection":[{"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/comments?post=1850"}],"version-history":[{"count":1,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/posts\/1850\/revisions"}],"predecessor-version":[{"id":1855,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/posts\/1850\/revisions\/1855"}],"wp:attachment":[{"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/media?parent=1850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/categories?post=1850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seismicconsolidation.com\/wp-json\/wp\/v2\/tags?post=1850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}