Hello, everyone.

This is Enta.

What do you do about the water used for mixing grout, mortar, sprayed concrete, and the like?

The water we use includes mountain spring water, river water, lake water, and tap water.

I think they're using freshwater instead of seawater.

I'm pretty sure they're not using rainwater, though lol

 

It’s a common misconception, but just because we tested the water quality doesn’t mean it’s okay!

That's what you'd think, right?

Water quality testing is only required for drinking water.

The standards are particularly strict when it comes to using it as public drinking water, and it will almost certainly not be approved unless it passes through a filter or similar treatment.

But there is water out there that doesn't contain any pathogens but has mineral levels that exceed the standard limits, isn't there?

They actually call that "mineral water," lol

Since it's well below the drinking water standards, it's easy to pass...

This means that, based on the water quality test results, this water is not suitable for use in the mixing process.

For example, the same applies to tap water.

 

So, which type of water is best for spraying?

The answer is simple, but,

Water that produces compressive strengthThat's it.

 

Suppose there are three types of water: A, B, and C.

A is river water

B is the water in the lake

C is tap water

Which one do you think is the strongest?

The results vary considerably depending on the region.

The answer becomes clear when you use all the water to make concrete test specimens and conduct compressive strength tests.

 

You can collect that water on-site and conduct a test installation without any issues (preferably with us present), or you can take the water to a public testing facility for testing.

Testing the Water Used for Mixing

In reality, having the test administered at an official testing center would likely make the results easier to accept (both personally and from the government’s perspective).

It is advisable to have someone present and keep a record of the photographs when collecting water samples at the site.

 

Evidence is crucial in our management work. (To put it coolly: "Evidence!")

Since we absolutely need proof, we can't just go by whether or not he said it.

Based on the results of the test conducted at the ○○ public testing facility, we obtained ○○ results, so we are planning to proceed with construction as described. What are your thoughts on this as the government agency (general contractor)?

It's important to hold discussions in that sort of spirit.

Here's some evidence from Ron, lol.

 

Tests like this might actually be a good idea, since they can sometimes be conducted as part of creative quality control efforts.

For the purpose of improving quality.

 

See you later.