{"id":7904,"date":"2019-06-18T12:10:21","date_gmt":"2019-06-18T12:10:21","guid":{"rendered":"https:\/\/nbrri.gov.ng\/new\/?page_id=7904"},"modified":"2019-06-20T09:32:42","modified_gmt":"2019-06-20T09:32:42","slug":"coarse-aggregate-testing","status":"publish","type":"page","link":"https:\/\/nbrri.gov.ng\/new\/coarse-aggregate-testing\/","title":{"rendered":"Coarse Aggregate Testing"},"content":{"rendered":"<p>Coarse aggregates are used in all fields of construction to produce bituminous mixtures and concrete to be used in structures, fill materials and as base materials in foundations, roads and railways.<\/p>\n<ul>\n<li><em>Particle Size Distribution<\/em><\/li>\n<li><em>Specific Gravity<\/em><\/li>\n<li><em>Flakiness<\/em><\/li>\n<li><em>Aggregate Impact Value(AIV)<\/em><\/li>\n<li><em>Aggregate Crushing Value(ACV)<\/em><\/li>\n<li><em>Los Angeles Abrasion<\/em><\/li>\n<li><em>Rock Strength<\/em><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><a name=\"_Toc522565236\"><\/a>PARTICLE SIZE DISTRIBUTION<\/h2>\n<p>Analysis of coarse aggregates by particle size provides useful engineering classification system from which a considerable amount of empirical data can be obtained.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8006 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Sieve-shaker-with-complete-set-of-sieve-1.jpg\" alt=\"\" width=\"357\" height=\"433\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Sieve-shaker-with-complete-set-of-sieve-1.jpg 494w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Sieve-shaker-with-complete-set-of-sieve-1-247x300.jpg 247w\" sizes=\"(max-width: 357px) 100vw, 357px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Figure 24: Sieve shaker with complete set of sieve<\/strong><\/p>\n<ul>\n<li>300mm Dia BS Sieves 38, 63, 75, 80, 90, 100, 125, 150, 180, 200, 212, 250, 315, 355, 400, 425, 500, 600, 630, 850 \u00b5m Stainless Steel Mesh fitted with Reinforcing Mesh.<\/li>\n<li>300mm Dia BS Sieves 1mm, 1.18mm, 1.25mm, 2mm, 2.36mm, 2.5mm, 2.8mm, 3.35mm, 4mm, 4.75mm\u00a0 Stainless Steel Mesh<\/li>\n<li>300mm Dia BS Sieves 5mm, 6.3mm, l0mm, 14mm, 20mm, 28mm, 37.5mm, 50mm, 63mm and 75mm Perforated Plate<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><a name=\"_Toc522565237\"><\/a>SPECIFIC GRAVITY<\/h2>\n<p>Buoyancy balance is used to determine the specific gravity of aggregates<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8008 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Buoyancy-balance.jpg\" alt=\"\" width=\"257\" height=\"384\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Buoyancy-balance.jpg 402w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Buoyancy-balance-201x300.jpg 201w\" sizes=\"(max-width: 257px) 100vw, 257px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Figure 25: Buoyancy balance<\/strong><\/p>\n<h2><a name=\"_Toc522565238\"><\/a>FLAKINESS<\/h2>\n<p>Flakiness sieves and gauges are used to determine if aggregate particles are to be considered flaky.<\/p>\n<p>Figure 26: Set of Flakiness sieve<\/p>\n<h2><a name=\"_Toc522565239\"><\/a>AGGREGATE IMPACT VALUE (AIV)<\/h2>\n<p>This test provides a relative measure of the resistance of coarse aggregate to sudden shock or impact<\/p>\n<p>Figure 2<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8009 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Aggregate-impact-value-apparatus.jpg\" alt=\"\" width=\"156\" height=\"230\" \/><\/p>\n<p style=\"text-align: center;\"><strong>7: Aggregate impact value apparatus<\/strong><\/p>\n<h2><a name=\"_Toc522565240\"><\/a>AGGREGATE CRUSHING VALUE (ACV)<\/h2>\n<p>This test provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8010 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Aggregate-crushing-value.jpg\" alt=\"\" width=\"299\" height=\"341\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Aggregate-crushing-value.jpg 526w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Aggregate-crushing-value-263x300.jpg 263w\" sizes=\"(max-width: 299px) 100vw, 299px\" \/><strong>Figure 28: Aggregate crushing value<\/strong><\/p>\n<h2><a name=\"_Toc522565241\"><\/a>LOS ANGELES ABRASION<\/h2>\n<p>The Los Angeles Abrasion machine is used to determine the resistance of coarse Aggregates to fragmentation.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8011 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Los-Angeles-Abrasion-Machine.jpg\" alt=\"\" width=\"268\" height=\"294\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Los-Angeles-Abrasion-Machine.jpg 351w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Los-Angeles-Abrasion-Machine-274x300.jpg 274w\" sizes=\"(max-width: 268px) 100vw, 268px\" \/><strong>Figure 29: Los Angeles Abrasion Machine<\/strong><\/p>\n<h2><a name=\"_Toc522565242\"><\/a>ROCK STRENGTH<\/h2>\n<p>The digital point load test apparatus is used to determine the strength of rock samples.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8012 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Digital-Point-Load-Test-Apparatus.jpg\" alt=\"\" width=\"300\" height=\"353\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Digital-Point-Load-Test-Apparatus.jpg 474w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Digital-Point-Load-Test-Apparatus-255x300.jpg 255w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><strong>Figure 30:\u00a0 Digital Point Load Test Apparatus<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coarse aggregates are used in all fields of construction to produce bituminous mixtures and concrete to be used in structures, fill materials and as base materials in foundations, roads and &hellip; <a href=\"https:\/\/nbrri.gov.ng\/new\/coarse-aggregate-testing\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Coarse Aggregate Testing<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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