{"id":57879,"date":"2026-01-07T08:00:54","date_gmt":"2026-01-06T23:00:54","guid":{"rendered":"https:\/\/norimen.net\/?p=57879"},"modified":"2026-05-16T17:57:36","modified_gmt":"2026-05-16T08:57:36","slug":"cement-milk-hot-water-temperature-standard","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/cement-milk-hot-water-temp-standard\/","title":{"rendered":"Guidelines for Diluting Cement Slurry with Hot Water Based on Finished Mix Temperature"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

I received an email regarding the conversation we had the other day about mixing mortar with hot water.<\/p>\n

\"What about the grout?\"<\/p>\n

\"Cement<\/p>\n

Based on my experience, I think cement slurry is a viable option.<\/p>\n

Especially when working in extremely cold conditions.<\/p>\n

Simulation at 50\u00b0C mixing water temperature<\/h2>\n

Simulation Conditions<\/h3>\n

Cement: 1,230 kg (specific heat: 0.20 kcal\/kg\u00b7\u00b0C)<\/p>\n

Mixing water: 615 kg (specific heat: 1.00 kcal\/kg\u00b7\u00b0C,Temperature: 50\u00b0C<\/span><\/strong>\uff09<\/p>\n

Admixture: 24.6 kg (specific heat: 1.00 kcal\/kg\u00b7\u00b0C; temperature: same as outside temperature)<\/p>\n

Formula:<\/p>\n

\"Calculation
*Calculation formulas from the Japan Society of Civil Engineers and the Architectural Institute of Japan: These are standard formulas presented in guidelines for concrete placement during cold weather. While concrete calculations include \u201ccoarse aggregate\u201d and \u201cfine aggregate,\u201d this formula has been simplified since we are dealing with cement slurry. The mortar formula from the previous post included fine aggregate.<\/figcaption><\/figure>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Outside Temperature (\u00b0C)<\/strong><\/td>\nCement Temperature (\u00b0C)<\/strong><\/td>\nWater Temperature (\u00b0C)<\/strong><\/td>\nTemperature After Mixing (\u00b0C)<\/strong><\/td>\n<\/tr>\n<\/thead>\n
-5.0<\/span><\/td>\n-5.0<\/span><\/td>\n50.0<\/span><\/td>\n33.2<\/b><\/span><\/td>\n<\/tr>\n
-2.5<\/span><\/td>\n-2.5<\/span><\/td>\n50.0<\/span><\/td>\n34.0<\/b><\/span><\/td>\n<\/tr>\n
0.0<\/span><\/td>\n0.0<\/span><\/td>\n50.0<\/span><\/td>\n34.7<\/b><\/span><\/td>\n<\/tr>\n
2.5<\/span><\/td>\n2.5<\/span><\/td>\n50.0<\/span><\/td>\n35.5<\/b><\/span><\/td>\n<\/tr>\n
5.0<\/span><\/td>\n5.0<\/span><\/td>\n50.0<\/span><\/td>\n36.3<\/b><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

This is just a rough estimate, but it looks something like this.<\/p>\n

\"Mixing<\/p>\n

*Vertical axis: Mixing temperature; Horizontal axis: Outside temperature<\/p>\n

 <\/p>\n

In conclusion, the mixing temperature is too high!<\/p>\n

As expected, since there's a lot of mixing water, the temperature tends to rise.<\/p>\n

It does drop quite a bit when you add aggregate, though.<\/p>\n

Standards for Mixing Temperature<\/h3>\n

Ministry of Land, Infrastructure, Transport and Tourism (General Specifications) \u00b7 Standard Specifications for Concrete (Construction)<\/p>\n

Concrete temperature during placement: 5\u00b0C or higher, 35\u00b0C or lower<\/span><\/strong><\/p>\n

The Japanese Geotechnical Society and other organizations do not specify standards for the mixing temperature in ground anchor work or rebar insertion work.<\/p>\n

Therefore, if we were to apply the Japan Society of Civil Engineers\u2019 Standard Specifications for Concrete and the guidelines for concrete placement in cold weather,<\/p>\n

Ensure that the temperature during mixing and application is 5\u00b0C or higher.<\/span><\/strong><\/span><\/p>\n

I think that's a good standard to go by.<\/p>\n

However, since concrete becomes \"hot-weather concrete\" when the temperature exceeds 35\u00b0C, it should be kept below that level.<\/p>\n

Simulation at 30\u00b0C mixing water temperature<\/h2>\n

Simulation Conditions<\/h3>\n

Cement: 1,230 kg (specific heat: 0.20 kcal\/kg\u00b7\u00b0C)<\/p>\n

Mixing water: 615 kg (specific heat: 1.00 kcal\/kg\u00b7\u00b0C,Temperature: 30\u00b0C<\/span><\/strong>\uff09<\/p>\n

Admixture: 24.6 kg (specific heat: 1.00 kcal\/kg\u00b7\u00b0C; temperature: same as outside temperature)<\/p>\n\n\n\n\n\n\n\n\n\n
Outside Temperature (\u00b0C)<\/strong><\/td>\nCement Temperature (\u00b0C)<\/strong><\/td>\nWater Temperature (\u00b0C)<\/strong><\/td>\nTemperature After Mixing (\u00b0C)<\/strong><\/td>\n<\/tr>\n<\/thead>\n
-5.0<\/b><\/span><\/td>\n-5.0<\/span><\/td>\n30.0<\/span><\/td>\n19.3<\/b><\/span><\/td>\n<\/tr>\n
-2.5<\/b><\/span><\/td>\n-2.5<\/span><\/td>\n30.0<\/span><\/td>\n20.1<\/b><\/span><\/td>\n<\/tr>\n
0.0<\/b><\/span><\/td>\n0.0<\/span><\/td>\n30.0<\/span><\/td>\n20.8<\/b><\/span><\/td>\n<\/tr>\n
2.5<\/b><\/span><\/td>\n2.5<\/span><\/td>\n30.0<\/span><\/td>\n21.6<\/b><\/span><\/td>\n<\/tr>\n
5.0<\/b><\/span><\/td>\n5.0<\/span><\/td>\n30.0<\/span><\/td>\n22.4<\/b><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Mixing<\/p>\n

*Vertical axis: Mixing temperature; Horizontal axis: Outside temperature<\/p>\n

This is a comparison graph of mixing water at 30\u00b0C, 40\u00b0C, and 50\u00b0C.<\/p>\n

What is the best temperature range?<\/h2>\n

In terms of workability and quality, when it comes to cement slurry, it is generally considered best to use mixing water at 30\u00b0C during application.<\/p>\n

 <\/p>\n

I don't think 40\u00b0C is a problem, but in reality, if the temperature gets too high, it starts to solidify inside the blender lol.<\/p>\n

It's not good because the concrete will end up in a \"summer heat\" state.<\/p>\n

Furthermore, since there is a significant risk that this could affect submersible pumps and other rubber gaskets,<\/p>\n

As for cement slurry, a temperature of around 30\u00b0C is considered ideal.<\/p>\n

 <\/p>\n

Also, even if the injection distance is around 100 meters, would 30 degrees be the optimal temperature, taking into account heat loss?<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Ambient and Cement Temperature<\/strong><\/td>\nWhen the water temperature is 30\u00b0C<\/strong><\/td>\nWhen the water temperature is 40\u00b0C<\/strong><\/td>\nWhen the water temperature is 50\u00b0C<\/strong><\/td>\n<\/tr>\n<\/thead>\n
-5 \u00b0C<\/b><\/span><\/td>\n19.3 \u00b0C<\/span><\/td>\n26.3 \u00b0C<\/span><\/td>\n33.2 \u00b0C<\/span><\/td>\n<\/tr>\n
-4 \u00b0C<\/b><\/span><\/td>\n19.6 \u00b0C<\/span><\/td>\n26.6 \u00b0C<\/span><\/td>\n33.5 \u00b0C<\/span><\/td>\n<\/tr>\n
-3 \u00b0C<\/b><\/span><\/td>\n19.9 \u00b0C<\/span><\/td>\n26.9 \u00b0C<\/span><\/td>\n33.8 \u00b0C<\/span><\/td>\n<\/tr>\n
-2 \u00b0C<\/b><\/span><\/td>\n20.2 \u00b0C<\/span><\/td>\n27.2 \u00b0C<\/span><\/td>\n34.1 \u00b0C<\/span><\/td>\n<\/tr>\n
-1 \u00b0C<\/b><\/span><\/td>\n20.5 \u00b0C<\/span><\/td>\n27.5 \u00b0C<\/span><\/td>\n34.4 \u00b0C<\/span><\/td>\n<\/tr>\n
0 \u00b0C<\/b><\/span><\/td>\n20.8 \u00b0C<\/span><\/td>\n27.8 \u00b0C<\/span><\/td>\n34.7 \u00b0C<\/span><\/td>\n<\/tr>\n
1 \u00b0C<\/b><\/span><\/td>\n21.1 \u00b0C<\/span><\/td>\n28.1 \u00b0C<\/span><\/td>\n35.0 \u00b0C<\/span><\/td>\n<\/tr>\n
2 \u00b0C<\/b><\/span><\/td>\n21.4 \u00b0C<\/span><\/td>\n28.4 \u00b0C<\/span><\/td>\n35.3 \u00b0C<\/span><\/td>\n<\/tr>\n
3 \u00b0C<\/b><\/span><\/td>\n21.8 \u00b0C<\/span><\/td>\n28.7 \u00b0C<\/span><\/td>\n35.6 \u00b0C<\/span><\/td>\n<\/tr>\n
4 \u00b0C<\/b><\/span><\/td>\n22.1 \u00b0C<\/span><\/td>\n29.0 \u00b0C<\/span><\/td>\n35.9 \u00b0C<\/span><\/td>\n<\/tr>\n
5 \u00b0C<\/b><\/span><\/td>\n22.4 \u00b0C<\/span><\/td>\n29.3 \u00b0C<\/span><\/td>\n36.3 \u00b0C<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

As long as the temperature doesn't drop below 5\u00b0C when the concrete is poured, there's no problem, so it's fine.<\/p>\n

By the way, if the mixing temperature is too high, it can lead to a decrease in strength, so you should definitely keep it below 30 degrees!<\/p>\n

 <\/p>\n

Since it\u2019s harder to get a strong buzz, especially in the winter, will drinking it with hot water become a must from now on?<\/p>\n

That's what I think.<\/p>\n

 <\/p>\n

See you later.<\/p>\n

If you're having any issues with your spray-applied boiler, please feel free to contact us.<\/p>","protected":false},"excerpt":{"rendered":"

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, \u201cWhat about grout?\u201d Based on my experience, I think using cement milk is a viable option\u2014especially when working in extremely cold conditions. I ran a simulation using mixing water at 50\u00b0C. Simulation\u2026<\/p>","protected":false},"author":2,"featured_media":57889,"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":[28,30,36],"tags":[49,70,377,2199,5562],"class_list":["post-57879","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","category-lock-bolt","category-quality","tag-49","tag-70","tag-377","tag-2199","tag-5562"],"acf":[],"yoast_head":"\n\u54c1\u8cea\u7ba1\u7406\u3000\u7df4\u308a\u6df7\u305c\u6c34\u306e\u6e29\u5ea6\u3068\u5f37\u5ea6\u306e\u95a2\u4fc2 - \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e<\/title>\n<meta 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