{"id":4657,"date":"2026-06-23T17:51:20","date_gmt":"2026-06-23T09:51:20","guid":{"rendered":"https:\/\/www.nlscientific.com\/concrete-slump-test-astm-c143-en-12350-2\/"},"modified":"2026-06-23T17:51:20","modified_gmt":"2026-06-23T09:51:20","slug":"concrete-slump-test-astm-c143-en-12350-2","status":"publish","type":"post","link":"https:\/\/www.nlscientific.com\/en_ph\/concrete-slump-test-astm-c143-en-12350-2\/","title":{"rendered":"Concrete Slump Test (ASTM C143 \/ EN 12350-2): Method &#038; Apparatus"},"content":{"rendered":"<p>The <strong>concrete slump test<\/strong> is the simplest and most widely used field check of fresh concrete consistency and workability.<\/p>\n<h2>What the Test Measures<\/h2>\n<p>Slump is the vertical drop of a freshly moulded concrete cone after the mould is lifted. It is an indirect measure of water content and workability, used for routine quality control and to confirm batch-to-batch consistency.<\/p>\n<h2>Apparatus Required<\/h2>\n<ul>\n<li>Slump cone (300 mm high, 100\/200 mm diameters) and base plate<\/li>\n<li>Tamping rod (16 mm diameter, rounded end)<\/li>\n<li>Steel rule or measuring tape<\/li>\n<li>Scoop and cleaning tools<\/li>\n<\/ul>\n<p>NL Scientific manufactures the <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product\/slump-cone-set-e-version\/\">Slump Cone Set<\/a> and the full <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product-category\/concrete\/\">concrete testing range<\/a>, built to ASTM, EN, BS and AASHTO requirements with ISO\/IEC 17025 accredited calibration.<\/p>\n<h2>Test Procedure<\/h2>\n<ol>\n<li>Dampen the cone and place it on a level, non-absorbent base plate, holding it down with the foot pieces.<\/li>\n<li>Fill in three equal layers, rodding each layer 25 times uniformly.<\/li>\n<li>Strike off the top level with the rod.<\/li>\n<li>Lift the cone vertically in 5\u201310 seconds without lateral movement.<\/li>\n<li>Measure the slump as the difference between the cone height and the highest point of the slumped concrete.<\/li>\n<\/ol>\n<h2>Calculation &amp; Reporting<\/h2>\n<p>Report the slump in millimetres. EN 12350-2 also classifies slump into classes S1\u2013S5; record the class where required.<\/p>\n<h2>Acceptance Criteria<\/h2>\n<p>The target slump is set by the specification and placement method (e.g. 50\u2013100 mm for normal reinforced concrete). A slump outside tolerance signals a change in water content or admixture and should be investigated before placing.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>What causes a shear or collapse slump?<\/h3>\n<p>A shear or collapse slump indicates a harsh or over-wet, non-cohesive mix. Only a true (even) slump is valid; repeat the test if shear occurs.<\/p>\n<h3>How soon must the test be done?<\/h3>\n<p>Begin within a few minutes of sampling and complete the measurement promptly, as slump decreases as the concrete stiffens.<\/p>\n<p><em>Need the right equipment for your laboratory?<\/em> <a href=\"https:\/\/www.nlscientific.com\/en_ph\/contact-us\/\">Contact NL Scientific for a quotation<\/a> &mdash; Asia&#8217;s leading manufacturer of civil engineering and material testing equipment, shipping worldwide.<\/p>","protected":false},"excerpt":{"rendered":"<p>The concrete slump test to ASTM C143 and EN 12350-2: apparatus, procedure, slump classes and interpretation of workability.<\/p>","protected":false},"author":1,"featured_media":3873,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"rank_math_lock_modified_date":false,"footnotes":""},"categories":[164],"tags":[],"class_list":["post-4657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts\/4657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/comments?post=4657"}],"version-history":[{"count":0,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts\/4657\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media\/3873"}],"wp:attachment":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media?parent=4657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/categories?post=4657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/tags?post=4657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}