{"id":4656,"date":"2026-06-23T17:51:13","date_gmt":"2026-06-23T09:51:13","guid":{"rendered":"https:\/\/www.nlscientific.com\/aggregate-impact-value-test-bs-812-112\/"},"modified":"2026-06-23T17:51:13","modified_gmt":"2026-06-23T09:51:13","slug":"aggregate-impact-value-test-bs-812-112","status":"publish","type":"post","link":"https:\/\/www.nlscientific.com\/en_ph\/aggregate-impact-value-test-bs-812-112\/","title":{"rendered":"Aggregate Impact Value Test (BS 812-112): Method, Apparatus &#038; Limits"},"content":{"rendered":"<p>The <strong>Aggregate Impact Value (AIV) test<\/strong> measures the resistance of aggregate to sudden shock or impact, which can differ from its resistance to slow compressive load.<\/p>\n<h2>What the Test Measures<\/h2>\n<p>AIV expresses the proportion of fines produced when a standard mass of aggregate is subjected to fifteen blows from a falling hammer. A lower AIV indicates a tougher aggregate better able to resist impact in pavements and concrete.<\/p>\n<h2>Apparatus Required<\/h2>\n<ul>\n<li>Aggregate impact testing machine with falling hammer and guide<\/li>\n<li>Cylindrical steel cup and tamping rod<\/li>\n<li>Test sieves (14.0 mm, 10.0 mm and 2.36 mm)<\/li>\n<li>Balance and drying oven<\/li>\n<\/ul>\n<p>NL Scientific manufactures the <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product\/aggregate-impact-value-apparatus\/\">Aggregate Impact Value Apparatus<\/a> and the full <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product-category\/aggregate-rock\/\">aggregate &#038; rock 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>Prepare aggregate passing 14.0 mm and retained on 10.0 mm; oven-dry.<\/li>\n<li>Fill the cup in three layers, each tamped 25 times, and weigh the sample (mass A).<\/li>\n<li>Position the cup and apply 15 blows of the hammer at not less than one-second intervals.<\/li>\n<li>Remove the crushed sample and sieve it on the 2.36 mm sieve.<\/li>\n<li>Weigh the fraction passing the 2.36 mm sieve (mass B).<\/li>\n<\/ol>\n<h2>Calculation &amp; Reporting<\/h2>\n<p><strong>AIV (%) = (B &divide; A) &times; 100<\/strong>, reported as the mean of two tests to one decimal place.<\/p>\n<h2>Acceptance Criteria<\/h2>\n<p>A maximum AIV of about 25\u201330% is commonly required for surfacing and heavy-duty pavement aggregate, with higher values acceptable for lower-grade applications. Refer to the project specification for exact limits.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>How does AIV relate to the Ten Percent Fines value?<\/h3>\n<p>Both come from BS 812 and assess toughness; AIV is impact-based while Ten Percent Fines is a crushing load test, often used together to characterise aggregate.<\/p>\n<h3>Is AIV the same as Aggregate Crushing Value?<\/h3>\n<p>No. ACV (BS 812-110) applies a slow compressive load, while AIV (BS 812-112) applies impact. They give related but distinct results.<\/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 Aggregate Impact Value (AIV) test to BS 812-112: apparatus, procedure, calculation and acceptance limits.<\/p>","protected":false},"author":1,"featured_media":3707,"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-4656","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\/4656","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=4656"}],"version-history":[{"count":0,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts\/4656\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media\/3707"}],"wp:attachment":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media?parent=4656"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/categories?post=4656"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/tags?post=4656"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}