Standards for Cement Milk Compressive Strength Tests | Why Three Samples in the Morning and Three in the Afternoon, and Flatness According to JIS A 1108
Hello, everyone. This is Enta. I’m often asked about the rationale behind the “three samples in the morning, three in the afternoon” schedule for compressive strength tests on cement slurry used in rock bolt and ground anchor construction. Younger site supervisors sometimes ask, “Wouldn’t it be safer to take 12 samples a day?”…
What is the pressure condition at the fixation site during injection? (Is pressurization necessary?)
Hello, everyone. This is Enta. Since my last post, I’ve been writing about packer pressure. I Tried Measuring the Limit of Packer Pressure! I Tried Measuring the Limit of Packer Pressure! (Part 2) I Tried Measuring the Limit of Packer Pressure! (Part 3) Packer pressure…
Guidelines for Diluting Cement Slurry with Hot Water Based on Finished Mix Temperature
Hello, everyone. This is Enta. I received an email regarding the discussion we had the other day about mixing mortar with hot water. The question was, “What about grout?” Based on my experience, I think using cement milk is a viable option—especially when working in extremely cold conditions. I ran a simulation using mixing water at 50°C. Simulation…
硬化遅効性減水剤を使ったセメントミルクの施工テクニック（コレで現場に余裕が生まれる）
皆さんこんにちは。 エンタです。 テリッとした猛暑が続きますね～ 空調服が一切効かず、脱いで長袖の方がかなり楽です。 空調服は気温がある程度下がってからですよ！ 空調服は35℃超で逆効果!現場で使える熱中症対策の正解 閑話休題 セメントミル…
水だけは入れないで！
Hello, everyone. This is Enta. When you’ve mixed a few batches of grout, the grout left in the mixer tends to get pretty hard, right? What do you do in that case? This video shows what happens when you add something to that hardened grout! At first, it’s all clumpy…
現場に合わせた工夫を行い安全に速く施工する
皆さんこんにちは。 エンタです。 先日うちの現場にあったグラウトミキサー！ コレがなかなかの仕上がりでｗ 捲き込まれ防止網が作ってありました。 通常メーカーのモノだとちょっと使いづらいので使用していませんが、現場社員の工夫でこの様に作ったそ…
加圧注入してケーシングの外から出てくる本当の理由！
皆さんこんにちは。 エンタです。 加圧作業していますか？ まぁ私は加圧はそれ程意味をなしていないと昔から言っていますが、口元からなぜ出るのか？ って話しになったので書いてみようと思います。 通常通り削孔し、グラウンドアンカーや…
Transparent construction management and transparent safety management instill a sense of security in others.
Hello, everyone. This is Enta. When doing ground anchor work or rebar installation, you put leftover grout and other materials into ton bags for disposal, right? When you do that, it usually looks something like this everywhere. We used to do it this way, too. No, wait…
The Actual Installation Location for Ground Anchor Work Is... Not What I Expected! (Part 1)
Hello, everyone. This is Enta. Do you know the actual location of ground anchors? Huh? You’re probably thinking, “What are you talking about?” lol. As a construction manager, you measure the anchor installation location based on layout tolerances, right? But layout tolerances only apply to the final head position…