{"id":8326,"date":"2018-10-25T08:00:34","date_gmt":"2018-10-24T23:00:34","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=8326"},"modified":"2026-05-17T13:51:45","modified_gmt":"2026-05-17T04:51:45","slug":"causes-of-mortar-cracks-part-2","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/mortar-crack-cause-part2\/","title":{"rendered":"Why Do Cracks Form in Mortar? (Part 2) | Drying Shrinkage"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>The machine is coming back today, so I'm going to organize and clean up the warehouse.<\/p>\n<p>If I\u2019d just done this regularly, this wouldn\u2019t have happened...<\/p>\n<p>From now on, I plan to make sure I have a designated spot for everything.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-8327\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/12e02104-21bf-490b-b03a-6ac32dc6b31f-600x477.png\" alt=\"Organization and Tidiness\" width=\"600\" height=\"477\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/12e02104-21bf-490b-b03a-6ac32dc6b31f.png 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/12e02104-21bf-490b-b03a-6ac32dc6b31f-300x239.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"text-decoration: underline;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/norimen.net\/en\/causes-of-mortar-cracks-part-1\/\" target=\"_blank\" rel=\"noopener\">Why Do Cracks Form in Mortar? (Part 1)<\/a><\/span><\/span><\/strong><\/span><\/p>\n<p>Up until the last time,<\/p>\n<p><span style=\"text-decoration: line-through;\">1. Spraying during periods of extremely high temperatures<\/span><\/p>\n<p><span style=\"text-decoration: line-through;\">2. The rock lines in the rock section and the sedimentary section were clearly visible.<\/span><\/p>\n<p>3. Overhang (a section of a rock face where the slope extends over your head like a roof overhang.)<\/p>\n<p>4. Spray loss occurred<\/p>\n<p>5. Plastic spacers<\/p>\n<p>6. A pile of material slid down while we were spraying.<\/p>\n<p>7. Nighttime temperatures drop to near 0 degrees (or below freezing).<\/p>\n<p><span style=\"text-decoration: line-through;\">8. The sand is bad.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>I have explained items 1, 2, and 8.<\/p>\n<p>&nbsp;<\/p>\n<p>Last time<\/p>\n<p>I explained that the spots most prone to cracking are likely numbers 1, 2, 5, and 8. (Opinions may vary.)<\/p>\n<p>&nbsp;<\/p>\n<p>Next, regarding point 5.<\/p>\n<p>It\u2019s always been the rule to place the last wire mesh in the center of the sprayed layer, so,<\/p>\n<p>If spacers are used and the spray-applied thickness is 100 mm, the metal mesh can be installed at the 50 mm mark, such that<\/p>\n<p>I was using plastic spacers.<\/p>\n<p>The spacer itself is 100 mm, and the design thickness is also 100 mm\u2014just enough to neatly conceal the top of the spacer.<\/p>\n<p>It also served as proof that the design-specified spray thickness of 100 mm had been achieved.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-8329\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/1f8a27a85732bc36b40c3d87a8f41f5b-600x400.jpg\" alt=\"Plastic Spacer: Cross-Section in Use\" width=\"600\" height=\"400\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/1f8a27a85732bc36b40c3d87a8f41f5b.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/10\/1f8a27a85732bc36b40c3d87a8f41f5b-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Normally, for reinforcing bars, a concrete cover is specified to prevent rust (corrosion), but<\/p>\n<p>Since this spacer is made of plastic, it won't rust.<br \/>\n(I seem to remember that back in the day, there was a sales pitch about how it wouldn't rust and you could control the thickness... or so I think...)<\/p>\n<p>&nbsp;<\/p>\n<p>Back in the day, spacers were used to support VP50 PVC pipes at 90 mm (for a spray-applied thickness of 100 mm)<\/p>\n<p>I remember cutting it and securing it with the main anchor pin (\u03c616 \u00d7 400).<\/p>\n<p>This varies by region, but if you drive a 150mm \u201cgosun\u201d nail 50mm into the wood, leaving 100mm of the head exposed, and then drive another 100mm until the head is hidden,<\/p>\n<p>There was a requirement where you had to drive a \u03c616 \u00d7 300 mm (straight pin) 150 mm into the material, leave 50 mm protruding, apply the spray coating, and if the protrusion was 50 mm or less during the final inspection, it would pass.<br \/>\n(I'm sure some of you will find this nostalgic (^\u2207^))<\/p>\n<p>I suppose today's plastic spacers are a remnant of those PVC pipes.<\/p>\n<p>In conclusion,<span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">The hardness is different. And that\u2019s where the connection is severed.<\/span><\/strong><\/span><\/p>\n<p>Another characteristic of plastic is that it has a high coefficient of thermal expansion.<\/p>\n<p>That means that while concrete expands in thickness during the summer, plastic also expands.<\/p>\n<p>If they were the same hardness or harder, neither would be a problem, but since their hardnesses differ, this is likely causing the cracks.<\/p>\n<p>Especially when it comes to spray-applied coatings like this,<span style=\"color: #ff0000; font-size: 20px;\"><strong>This is particularly evident in concrete with small cross-sections.<\/strong><\/span><\/p>\n<p>But whether you put a spacer in or not, cracks are definitely going to form! lol<\/p>\n<p>There is also the view that, since it is made of plastic, it is not affected by the expansion and contraction of concrete.<\/p>\n<p>But since that\u2019s actually where the connection ends, it\u2019s hard to say they\u2019re completely unrelated.<\/p>\n<p>I have no intention of dismissing what has come before, and plastic spacers are still in use today.<\/p>\n<p>I don't particularly intend to deny that either.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6044 size-large\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/02\/8ace7542bb5cb15a839f07ee8e1e440c-600x460.jpg\" alt=\"PC Spacer Installation Status\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/02\/8ace7542bb5cb15a839f07ee8e1e440c.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/02\/8ace7542bb5cb15a839f07ee8e1e440c-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>However, if you're going to install one anyway, you should use a spacer that's at least as good as the mesh, so that,<\/p>\n<p>There is a possibility that we can reduce the number of cracks, even if only slightly.<\/p>\n<p>As long as I am an engineer, I will strive to create and deliver the best possible products.<\/p>\n<p>Since I want to minimize cracks as much as possible, I plan to pay close attention to this.<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>\n<p><span style=\"text-decoration: underline;\"><span style=\"font-size: 20px;\"><strong><span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/norimen.net\/en\/wordpress\/2018\/02\/22\/%e4%bd%bf%e3%81%a3%e3%81%a6%e8%a6%8b%e3%81%9f%ef%bc%81pc%e3%82%b9%e3%83%9a%e3%83%bc%e3%82%b5%e3%83%bc\/\" target=\"_blank\" rel=\"noopener\">I tried using a PC spacer.<\/a><\/span><\/strong><\/span><\/span><\/p>\n<p><a href=\"https:\/\/norimen.net\/en\/wordpress\/2017\/07\/23\/pc%e3%82%b9%e3%83%9a%e3%83%bc%e3%82%b5%e3%83%bc%e3%82%ab%e3%82%bf%e3%83%ad%e3%82%b0\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline; color: #0000ff;\"><strong><span style=\"font-size: 20px;\">PC Spacer Catalog<\/span><\/strong><\/span><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. Today, since the machinery is coming back, I\u2019m organizing and tidying up the warehouse. If I\u2019d kept up with this regularly, I wouldn\u2019t be in this situation\u2026 From now on, I plan to assign specific storage locations for everything. But anyway, why do cracks form in mortar? (Part 1)\u2026<\/p>","protected":false},"author":2,"featured_media":6615,"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_total_topic_count_hidden":0,"_bbp_total_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[34,36],"tags":[139,140,394,537],"class_list":["post-8326","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-slope-work","category-quality","tag-139","tag-140","tag-pc","tag-537"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.5 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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