{"id":48371,"date":"2023-01-27T08:00:55","date_gmt":"2023-01-26T23:00:55","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48371"},"modified":"2026-05-17T00:33:06","modified_gmt":"2026-05-16T15:33:06","slug":"core-specimen-water-curing","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/core-specimen-water-curing\/","title":{"rendered":"Recommendations for Underwater Curing | Curing Methods for Core Test Specimens Based on JIS A1108"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>It's a really cold day, isn't it!<\/p>\n<p>It's really tough to maintain quality control when it's this cold, isn't it?<\/p>\n<p>I hope this cold snap ends soon, but it\u2019s not even February yet lol<\/p>\n<p>It's showtime!<\/p>\n<p>Let's be careful on our way there ^^<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-48373\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2023\/01\/2023-01-26-13.14.57-4.jpg\" alt=\"Cold Snap\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2023\/01\/2023-01-26-13.14.57-4.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2023\/01\/2023-01-26-13.14.57-4-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<h3><span style=\"font-size: 16px;\">JIS A1108<\/span><\/h3>\n<p><span style=\"font-size: 18px;\"><strong><span style=\"color: #0000ff;\">If the core test specimen is immersed in water at 20\u00b12\u00b0C for at least 40 hours prior to testing,<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\"><strong><span style=\"color: #0000ff;\">During testing, the moisture content of the test specimens can be kept nearly constant.<\/span><\/strong><\/span><\/p>\n<h3><span style=\"font-size: 16px;\">Here's a surprising fact!<\/span><\/h3>\n<p>If the core removed before the test date is left to cure in the open air,<span style=\"color: #0000ff;\">Very dry<\/span>Do.<\/p>\n<p><strong><span style=\"color: #ff0000;\">Its strength decreases when it dries.<\/span><\/strong><\/p>\n<p>On actual job sites, the legal framework is subject to moisture from rain and other sources, so it isn't always dry.<\/p>\n<p>Therefore, since this creates a difference in strength between the core and the field-cast concrete, if the core is cured underwater for more than 40 hours to ensure the same conditions,<\/p>\n<p><span style=\"font-size: 18px;\"><strong><span style=\"color: #0000ff;\">It can be set to the same conditions as the actual site<\/span><\/strong><\/span>That's right.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3606\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/06\/4704a44e5e9cfdb29baa200bbf510bc4.jpg\" alt=\"\" width=\"604\" height=\"428\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/06\/4704a44e5e9cfdb29baa200bbf510bc4.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/06\/4704a44e5e9cfdb29baa200bbf510bc4-300x213.jpg 300w\" sizes=\"auto, (max-width: 604px) 100vw, 604px\" \/><\/p>\n<h3>Comparison of Core Strength and In-Situ Strength in Core Curing Methods<\/h3>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #0000ff;\">Core (Aerial Curing) &lt;<span style=\"color: #ff0000;\">On-site<\/span><\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #0000ff;\"><span style=\"color: #ff0000;\">Core (kept submerged in water at all times since extraction)<\/span>&gt; On-site<\/span><\/strong><\/span><\/p>\n<p><span style=\"color: #000000; font-size: 20px;\"><strong>Core (cured underwater for at least 40 hours prior to the test) = On-site<\/strong><\/span><\/p>\n<p>While it\u2019s fine to take core samples while the specimen is in the air, it\u2019s recommended to switch to underwater curing two or three days before the test and then conduct the test.<\/p>\n<p>Doing so ensures that conditions match those on-site and also helps minimize variation.<\/p>\n<p>I recommend giving it a try at sites where there is significant variation.<\/p>\n<p>By the way, if the contractors say to you, \u201cSpray coating is supposed to be air-cured, isn\u2019t it?!!\u201d<\/p>\n<p><span style=\"font-size: 18px; color: #0000ff;\"><strong>JIS A1108<\/strong><\/span><\/p>\n<p>Go ahead and say with confidence, \"It's in there!!\" lol<\/p>\n<p>In addition, a dry core is up to<span style=\"font-size: 120%;\"><strong><span style=\"color: #ff0000;\">A decrease in strength of about 20 percent<\/span><\/strong><\/span>That's what they say. (\u2193 It's cited in the reference.)<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 18px; color: #0000ff;\"><strong><span style=\"text-decoration: underline;\"><a title=\"Minimizing Variations in Compressive Strength\" href=\"https:\/\/norimen.net\/en\/wordpress\/%e5%9c%a7%e7%b8%ae%e5%bc%b7%e5%ba%a6%e3%81%ae%e3%83%90%e3%83%a9%e3%83%84%e3%82%ad%e3%82%92%e6%8a%bc%e3%81%95%e3%81%88%e3%82%8b\/\" target=\"_blank\" rel=\"noopener\">Minimize variation.<\/a><\/span><\/strong><\/span><\/p>\n<p>References: Methods for Taking Concrete Cores and Test Methods for Compressive Strength<\/p>\n<p>JISA1107: Deliberated by the Japanese Industrial Standards Committee; Revised in March H24 (Published by the Japanese Standards Association)<\/p>\n<p>Key Points of Concrete Technology 11 (Japan Concrete Institute)<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. It\u2019s really cold out today, isn\u2019t it! Quality control gets tough when it\u2019s this cold, doesn\u2019t it? I wish this cold snap would end soon, but February hasn\u2019t even arrived yet lol. The real challenge is just beginning! Let\u2019s be careful out there ^^ Anyway, moving on\u2026 JIS A1108 core testing\u2026<\/p>","protected":false},"author":2,"featured_media":3607,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[36],"tags":[71,102,374,434,435],"class_list":["post-48371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quality","tag-71","tag-102","tag-374","tag-434","tag-435"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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