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Pattaya Beach Nourishment


john luke
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5 minutes ago, Thai Spice said:

Agreed with all the above.

Often a small, low qualified subcon will try to get away with 6mm wire mesh instead of 8 or 10, or 10mm rbar reinforcements.

Concerning the water a thing we always watched was the mixer truck driver adding generous quantities of water in the mix "to have it flow better"....  Hence the slump test at EACH truck just before pouring. A pain but the only way to be sure.

Sometimes it was good fun to see the result flowing like a soup from the test plate....Out you go my man...

Being it Thailand, VN and even in HKG you have to be carefull.

In our case it was deep foundation, so the whole building is supported by it.

 

 

One of the group of companies I worked for was Hanson, who have large readymix concrete interests in SE Asia and other countries around the World,  including Thailand back in the day I believe.

They changed their practices back in the mid 80’s, so anyone shouting out “wet it up driver” had to sign the delivery ticket to say they wanted very wet concrete. 

It’s the little builders that do small construction jobs that now have to be watched, they will always cut corners IMHO. 😡

 

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Concrete pad going in today across from A One Hotel using the rebar on top of cling film method.
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Interesting posts about concrete testing. Got lucky today and got a pic of them taking samples for strength testing. Is it normal to get nine samples from one load?
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Across from Soi 5.
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And at the Klang intersection.
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Can't believe they intend to pour concrete over the rebar in this section. Even w/o the rebar there won't be enough depth to the concrete for it to last long.
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About concrete testing : (from the net)

"Never take a sample from the first or last section of the pour, it won’t be a true representation of the batch. The concrete is usually sampled after the 1st metre of concrete has been poured to ensure a good sample is taken. As said in BS EN 12350-1, take a few samples throughout the pour for the best representation of the batch and make sure you take 150% of what you think you’ll need. The sample is taken and used to make the cubes. The sample must be a good cohesive mix, it may require some mixing once taken from the concrete batch to be suitable for a slump test and cubes."

Samples can be taken in cubes or cylinders. 

Usually tests are done at 7 days and at 28 days, but it can be more. So if you take say 3 sample at each truck, you need 6.  All depends on the specs agreed when signing the job contract. And having a few spare can be useful when a test fails....

https://www.concretenetwork.com/concrete-testing/

Remember I am (was) a technician on construction machinery, not a civil engineer so this is not really my field, although seeing it done for years you know a few things.

Cheers.

Thanks for the pics and follow up, always interesting to follow !

 

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You are spot on TS, usualy take a few scoops as the load is poured but not from the first or last bits. Seems like a lot of tubes for one load, but it has been known that one “good load” with the correct Water/Cement ratio is delivered and the rest is, shall we say, deficient in Cement, but using this method, you know you have enough test samples that will pass all the required crush tests.😉

Of course, it could be that the contractor and the concrete supplier are going to do their own separate tests, hence all the steel tubes for samples from one load. 

Usually enough for four cubes or tubes as in those pictures, per 6m3 load.

Strip the mould the next day then put them into water tanks at a set temperature. The first is, as you say, crushed at 7 days, the second at 28 days and plotted on a graph to give you the strength and curing rate. 

I wonder if the cement used is Sulphate Resistant Cement, as I would expect the concrete would be subject to high salt water/air in that position. 

The “cling film” mentioned in another post, is a simple protective moisture membrane (sort of a damp proof course) between the underlying sand and the concrete, but it is usually a lot thicker than that I see they are using. 🤔

 

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Work going on to reinforce the point on the north end with caged rip rap.
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No cracks yet in the concrete pad at the Klang intersection. Typical Thai pride in workmanship, couldn't even be arsed with trimming the excess plastic off.
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Edited by forcebwithu
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I took a look at the situation at the north end of the beach on Friday (1 March).

Once upon a time there was a footpath that went around the Dusit headland, enabling you to walk to the bay beyond. Inevitably, it wasn't maintained and rotted away. I have been wondering if they would establish a beach around the headland, and thus give access to the bay again. The answer looks as though it is not in the plans. There was an intrepid guy seeing if he could walk around all the same, but was scuppered by the rocks.

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We pondered over the purpose of the channels they have installed between the pavement and the beach, and I thought we had resolved they were for water running off the pavement and draining into the ground through these channels.

I cannot reconcile that with what I've seen today - lining of the channels with some material that looks far from porous.

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Up outside the Thai Air office, a new concrete slab has been laid, surrounded by drainage channels.

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The drain that runs the length of Beach Road, from the Dolphin roundabout to the bend at the Thai Air office, seems to now drain into a dead end

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15 minutes ago, Bazle said:

The drain that runs the length of Beach Road, from the Dolphin roundabout to the bend at the Thai Air office, seems to now drain into a dead end

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Amazing Thailand. Not only does that rain water gutter go nowhere, but I'm pretty sure the big 1m or so black plastic pipe that was to serve as a stormwater outlet from the pad in this pic has been removed. So effectively that storm water has nowhere to go either. That's why when we've had a bit of rain in the past you see the black, smelly water overflowing out through the top access cover.
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Same with what you noticed in these rainwater channels. Looks like some idiot put in a layer of concrete where it was designed to be open to allow rainwater to filter down into the rock retaining walls that make up these channels. I believe the design calls for a filter cloth on top, followed by a layer of stone pebbles to make it possible for people to walk over the channel w/o breaking an ankle.00C.thumb.jpg.69f02a8b63cac4b4c445ea820cfd57fc.jpg

Borrowing one of your earlier photos to show the retaining wall design that is now installed.
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8 minutes ago, forcebwithu said:

 

Same with what you noticed in these rainwater channels. Looks like some idiot put in a layer of concrete where it was designed to be open to allow rainwater to filter down into the rock retaining walls that make up these channels. I believe the design calls for a filter cloth on top, followed by a layer of stone pebbles to make it possible for people to walk over the channel w/o breaking an ankle.00C.thumb.jpg.69f02a8b63cac4b4c445ea820cfd57fc.jpg

Borrowing one of your earlier photos to show the retaining wall design that is now installed.
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I agree. The mesh was mentioned to me by the "engineer" I spoke to as a weed membrane, to be covered in "small rocks", or pebbles. Presumably to work as a basic soakaway. I was surprised to see some of the mesh had been replaced by a non porous concrete layer...

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Apologies... was very unobservant on my walk along the beach this morning. I'd got from sois 1 to 6 before I noticed this...

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Yes... small rocks have arrived, although id have thought they needed much more depth.... but what do I know?

It might have been that the troughs were fuller further north and these were just using the end of the truckload, as further South they had no rocks at all...

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8 minutes ago, Painter said:

Yes... small rocks have arrived, although id have thought they needed much more depth.... but what do I know?

It might have been that the troughs were fuller further north and these were just using the end of the truckload, as further South they had no rocks at all...

Some have been half-filled with pebbles, others with gravel. I saw that on Friday.

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Yesterday, even more strangely, I noticed that they had started to put a further membrane over that filling.

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These channels are a quite mystery -

1. If they really are for run-off water, why have they seemingly been made impermeable?

2. Why are they not along the complete beach - why just in certain sections?

3. Why in certain sections are they built immediately against the walkway and, in others, with a gap that has now been concreted in?

4. How do they propose to keep them clean of rubbish and rotting matter (like leaves)?

5. What is expected to happen at this junction?

Friday

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Saturday

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I took a look at the work being done at the far end of the beach this afternoon, the last time for a while.

Contrary to my thought a couple of weeks ago, now I think that it IS looking as if they are going to build a walkway around the Dusit headland to the adjoining cove. Have a look at the pics - do you agree?

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  • 3 weeks later...

Why am I not surprised that these flood works haven’t worked. 

You can’t build on sand, you need solid foundations and sand doesn’t fit the bill. 

Still, someone got paid and no doubt will be paid again to “fix” it. 

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