{"id":7907,"date":"2019-06-18T12:13:55","date_gmt":"2019-06-18T12:13:55","guid":{"rendered":"https:\/\/nbrri.gov.ng\/new\/?page_id=7907"},"modified":"2019-06-20T09:22:45","modified_gmt":"2019-06-20T09:22:45","slug":"concrete-testing","status":"publish","type":"page","link":"https:\/\/nbrri.gov.ng\/new\/concrete-testing\/","title":{"rendered":"Concrete Testing"},"content":{"rendered":"<p>Concrete is a mixture of sand, gravel, cement and water together, moulded into a variety of forms and left to cure over time. Concrete is one of the most versatile construction materials and its quality is crucial if structures are to be safe and meet required standard.<\/p>\n<ul>\n<li><em>Fresh Concrete Testing<\/em><\/li>\n<li><em>Slump test<\/em><\/li>\n<li><em>Compaction factor<\/em><\/li>\n<li><em>Hardened Concrete Testing<\/em><\/li>\n<li><em>Destructuive compressive strength<\/em><\/li>\n<li><em>Non-destructuive compressive test<\/em><\/li>\n<li><em>Flexural Strength<\/em><\/li>\n<li><em>Crack detection microscope<\/em><\/li>\n<\/ul>\n<h2><a name=\"_Toc522565244\"><\/a>FRESH CONCRETE TESTING<\/h2>\n<p>Correct sampling and mixing of fresh concrete is very important in the production of high quality concrete.<\/p>\n<h3><a name=\"_Toc522565245\"><\/a>SLUMP TEST<\/h3>\n<p>This test is used to determine the consistency and workability of fresh concrete.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8000 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/slump-test-apparatus.jpg\" alt=\"\" width=\"413\" height=\"379\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/slump-test-apparatus.jpg 600w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/slump-test-apparatus-300x276.jpg 300w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Figure 31: slump test apparatus<\/strong><\/p>\n<h3><a name=\"_Toc522565246\"><\/a>COMPACTION FACTOR<\/h3>\n<p>This test is used to determine the compaction factor of concrete in low, medium and high workability<\/p>\n<p>Fi<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8001 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Compaction-factor-test-apparatus.jpg\" alt=\"\" width=\"201\" height=\"309\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Compaction-factor-test-apparatus.jpg 201w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Compaction-factor-test-apparatus-195x300.jpg 195w\" sizes=\"(max-width: 201px) 100vw, 201px\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 32: Compaction factor test apparatus<\/strong><\/em><\/p>\n<h2><a name=\"_Toc522565247\"><\/a>HARDENED CONCRETE TESTING<\/h2>\n<p>The compressive strength of hardened concrete can be tested using destructive and non-destructive methods.<\/p>\n<h3><a name=\"_Toc522565248\"><\/a>DESTRUCTUIVE COMPRESSIVE STRENGTH<\/h3>\n<p>This test determines the compressive strength of concrete cubes by crushing.<\/p>\n<p style=\"text-align: center;\"><strong><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8002 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Destructive-compressive-strength-machine.jpg\" alt=\"\" width=\"289\" height=\"466\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Destructive-compressive-strength-machine.jpg 372w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Destructive-compressive-strength-machine-186x300.jpg 186w\" sizes=\"(max-width: 289px) 100vw, 289px\" \/>Figure 33: Destructive compressive strength machine<\/strong><\/p>\n<h3><a name=\"_Toc522565249\"><\/a>NON-DESTRUCTUIVE COMPRESSIVE TEST<\/h3>\n<p>The concrete test determines the quality of concrete in finished structures\u00a0such as buildings and bridges<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8003 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Schmidt-rebound-hammer.jpg\" alt=\"\" width=\"259\" height=\"194\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Figure 34: Schmidt rebound hammer<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3><a name=\"_Toc522565250\"><\/a>FLEXURAL STRENGTH<\/h3>\n<p>This test determines the flexural strength of 100mm and 150mm square section concrete beams.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-8004 aligncenter\" src=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Mini-flexural-machine.jpg\" alt=\"\" width=\"344\" height=\"420\" srcset=\"https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Mini-flexural-machine.jpg 491w, https:\/\/nbrri.gov.ng\/new\/wp-content\/uploads\/2019\/06\/Mini-flexural-machine-246x300.jpg 246w\" sizes=\"(max-width: 344px) 100vw, 344px\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Figure 35: Mini flexural machine<\/strong><\/p>\n<h3><a name=\"_Toc522565251\"><\/a>CRACK DETECTION MICROSCOPE<\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Concrete is a mixture of sand, gravel, cement and water together, moulded into a variety of forms and left to cure over time. Concrete is one of the most versatile &hellip; <a href=\"https:\/\/nbrri.gov.ng\/new\/concrete-testing\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Concrete 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\/ -->\n<title>Concrete Testing - Nigerian Building &amp; Road Research Institute (NBRRI)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nbrri.gov.ng\/new\/concrete-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Concrete Testing - Nigerian Building &amp; Road Research Institute (NBRRI)\" \/>\n<meta property=\"og:description\" content=\"Concrete is a mixture of sand, gravel, cement and water together, moulded into a variety of forms and left to cure over time. 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