{"id":57949,"date":"2026-01-19T08:00:37","date_gmt":"2026-01-18T23:00:37","guid":{"rendered":"https:\/\/norimen.net\/?p=57949"},"modified":"2026-05-17T06:34:34","modified_gmt":"2026-05-16T21:34:34","slug":"site-rust-consideration-1","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/site-rust-consideration-1\/","title":{"rendered":"Thoughts on Rust at the Construction Site (Part 1)"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

It\u2019s almost as if the quality of the work depends entirely on how it turns out on site.<\/a><\/p>\n

There\u2019s one more thing that caught my attention during our recent discussion about the appearance of the job site.<\/p>\n

 <\/p>\n

There's something else that's really on my mind!<\/h3>\n

This is it!<\/p>\n

\"Epoxy<\/p>\n

This is it\u2014do you know what it is?<\/p>\n

 <\/p>\n

It's the chorus.<\/p>\n

What's more, these are rebar coated with epoxy.<\/p>\n

\"Epoxy<\/p>\n

At first, I wondered if it was a Gebindestab (PC stringers + epoxy coating), but the coating seemed rather thin.<\/p>\n

And it's totally rusted.<\/p>\n

Can epoxy paint actually rust!?<\/p>\n

That's the gist of it.<\/p>\n

\"Epoxy-Coated<\/p>\n

Most of them were rusty.<\/p>\n

 <\/p>\n

After looking into it, it seems that the rust-preventive effectiveness of epoxy-coated rebar lasts for about 20 years at most!<\/p>\n

However, if the coating is thin, it seems to last about 5 years or so...<\/p>\n

Whaaaaaaaat?!<\/p>\n

Right!?<\/p>\n

 <\/p>\n

Here are the types of rust prevention commonly used on-site, along with their intended environments and expected service life.<\/p>\n

Comparison Table by Rust Prevention Method<\/p>\n\n\n\n\n\n\n\n\n
Rust Prevention Methods<\/th>\nTypical Coating Thickness<\/th>\nService Life in Normal Environments<\/th>\nService Life in Coastal Areas<\/th>\nFeatures and Precautions<\/th>\n<\/tr>\n<\/thead>\n
Electroplating (Zinc Electroplating)<\/strong><\/td>\n5\u201315 \u03bcm<\/td>\nApproximately 1 to 5 years<\/td>\nApproximately 0.5 to 2 years<\/td>\nThin film; low cost. Short lifespan outdoors and in coastal areas. Primarily intended for indoor and temporary use.<\/td>\n<\/tr>\n
Galvanizing (Hot-Dip Galvanizing)<\/strong><\/td>\n50\u2013100 \u03bcm<\/td>\nApproximately 20 to 50 years<\/td>\nApproximately 10 to 30 years<\/td>\nHigh durability thanks to sacrificial corrosion protection. Scratch-resistant. Suitable for exterior structures and slope reinforcement hardware.<\/td>\n<\/tr>\n
Rust-Preventive Coating (General-Purpose Anti-Corrosion Paint)<\/strong><\/td>\n20\u201340 \u03bcm<\/td>\nAbout 5 to 10 years<\/td>\nApproximately 2 to 5 years<\/td>\nInexpensive and easy to repair. Requires periodic repainting.<\/td>\n<\/tr>\n
Epoxy Coating (Heavy-Duty Corrosion Protection)<\/strong><\/td>\n150\u2013300 \u03bcm<\/td>\nAbout 20 to 30 years<\/td>\nAbout 10 to 20 years<\/td>\nHighly durable, but surface preparation is essential. The outcome depends heavily on the quality of installation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

*The results vary significantly depending on the thickness of the coating.<\/p>\n

 <\/p>\n

I guess regular hot-dip galvanizing is still the better option... (Hot-dip galvanizing provides rust protection for just under 50 years.)<\/p>\n

Why did you choose this epoxy?<\/p>\n

I\u2019d really like to ask the design team about that, lol.<\/p>\n

Could it be that the manufacturer's designers came up with this and it was actually adopted?! (Oh no!)<\/p>\n

I really appreciate that you didn't put a cap on it, but there seems to be an issue with the rust-proofing on the pull rod.<\/p>\n

As expected, hot-dip galvanized rebar really is the best.<\/p>\n

Even when considering value for money and ease of use...<\/p>\n

Next time, I'll try writing about these measures.<\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. The final look of a job site pretty much determines whether the quality is good or bad. While we were talking about the appearance of a recent job site the other day, there was one more thing that caught my attention. Something even more concerning! This is it! Can you tell what this is? &n\u2026<\/p>","protected":false},"author":2,"featured_media":57945,"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":[30],"tags":[44,116,2909,5644,14153],"class_list":["post-57949","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lock-bolt","tag-44","tag-116","tag-2909","tag-5644","tag-14153"],"acf":[],"yoast_head":"\n\u9244\u7b4b\u633f\u5165\u5de5\u3000\u9306\u3073\u5bfe\u7b56\u3000\u9632\u9306\u306e\u7a2e\u985e\u3068\u52b9\u679c - \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e<\/title>\n<meta name=\"description\" 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