Restoration of a river stone wall

[Forhorse]

Dismantling and reassembling with lime mortar is effectively the least expensive, but also very time-consuming.
it depends on the time you want to devote to this work.
Maybe a little less durable than a reinforced concrete retaining wall, but if done right it will still last a century or two

[Rabbit]

Maybe a little less durable than a reinforced concrete retaining wall, but if done right it will still last a century or two

I am not convinced that reinforced concrete is more durable than a
wall goes up to lime. If modern bridges could hold it wouldn't be
that for a century it will already be not so bad.
I know masonry constructions with lime which have several centuries.
It will amaze us that our descendants will be able to say the same of our
buildings and bridges.

[bidouille23]

Hello, out of concrete , have often told me that the average lifespan of concrete is 70 years, I never really understood why, and had never asked the question.

Some time ago I had an answer, the salts among others ... ...
Small crystals enter the material and grow without ever being able to be removed once it has arrived, it can dry but not leave, when the thick crystals it crumbles the concrete, if there is frost in addition it is bingo and rebelotte ...

[Forhorse]

There is also the "cancer of concrete": the metal reinforcement which ends up rusting and shattering the concrete.
I believe that the first reinforced concrete structure built by Louis Vicat (a small pedestrian bridge) is still standing since 1855

Lime is not eternal either, I am in the middle of renovating a house built 200 years ago, and all lime mortars are hollowed out with a teaspoon and / or fall all alone as soon as a fly farts
The house stands up thanks to the quality of the work of the mason who built it and the absence of parasitic constraints other than gravity. But I'm going to have to stake everything and redo everything (naturally lime)

The problem here is not so much the binder but the constraints that apply to the wall. It is a retaining wall which has its feet in the water. There is a very large lateral push which will invariably end up tilting and then collapsing any poorly dimensioned wall.
Mounted with lime or cement, if it does not have a thickness at the base more than substantial (at random I would say 2 good meters) it will always end up falling on the side where it leans, it is only a a matter of time.

The advantage of reinforced concrete here is the reduced volume of materials used thanks to its rigidity. But here again, mounting a concrete wall without a properly dimensioned support and a structure of suitable shape and size will lead to the same result as a too narrow stone wall.

[chatelot16]

with air lime it is necessary to adjust the stones well so that it is solid ... anyway air lime is very slow to harden, and can only harden when dry: therefore good for nothing for a wall feet in the 'water

hydraulic lime is an intermediary between pure lime and cement

cement is more solid when it is of good quality, and we use good quality sand too ... say that it is as solid as stone so you can get the same resistance without breaking your head
that by adjusting the stones

the old reinforced concrete work is solid because it was made with a maximum of precaution on the quality of the materials! vicat was not a mason or an architect, he was a specialist in lime and cement!

do not look at the cathedral of royan, built in 1950 all in concrete which falls into ruin because they used sea sand full of salt

[bidouille23]

Bonjour,

Forhorse, for the concrete to stick well to the scrap it must be made to blush (left outside so that it rusts on the surface, red rust) then the cement and the rust gives I do not know any more which compound which stabilizes the rust.

If it gets too rusty, it becomes a problem, and if there is not enough concrete thickness to cover the scrap metal, it also becomes a problem. This is often the problem when the concrete bursts, it is enough to measure the thickness between scrap and outer edge of the concrete to realize this ....

Rust therefore is not the cause of the bursting of the concrete it is the bad implementation which is it, it is not necessary to mix everything;) ...

Then in terms of sizing just read the links I provided above it also avoids saying things randomly, given the price of m3 of concrete ....
Finally in the case of concrete that is vibrated, it is necessary to refer to the vibration time abac, as well as respecting the dosages at the top according to the work, too much water decreases the resistance, not enough too ... Do not forget to take into account the amount of water present in the aggregates, and finally Normally, the subsidence with the cone of abrams should be controlled ...

Concrete is not just cement, sand and water it is much more complex than that and according to the adjuvant that you add to it you completely change their resistance, take the case of the bridge built in China. added ash I believe to obtain a concrete which hardens quickly and especially which resists sea water ...

for dosages:

http://iut-tice.ujf-grenoble.fr/tice-es ... ux/5.3.pdf

for vibration:

http://iut-tice.ujf-grenoble.fr/tice-es ... ux/5.3.pdf

I did not take the time to find vibration abacs but it should not take 10 lead ...

I come back to the solution to rebuild the wall:

side time for an uninitiated it will be long I would even say very long to go back, by cons make a formwork for casting a flying buttress (it's basically a triangle with a sole, all with scrap, scrap that will inked in the existing wall too).

in any case you will probably rent a mini excavator, renting a core drilling machine is not a fortune, at worst a good hammer with a big drill bit will do the trick very well ....

And finally IN ALL CASES, only the drainage and the installation of barbicanes will avoid that there is too much push on the walls ....

Now everyone is free to think what they want, for my part I have a civil engineering baccalaureate and concrete calculations with manufacture of test pieces passed to the hydraulic press to measure their resistance I eat a little when same (and many other things too), so I can't let anything say ...


For lime it is the same thing poorly implemented it is worth nothing .... like everything else ...

better take your time Seb, start by disbursing in front of the wall it will already give you an idea of ​​what to do ...

But before take the time to read the links provided in any case it will be on the knowledge side, and it will guide you on the right path ....

see you

[AlterEco]

If it gets too rusty it becomes a problem
--
Concrete is not just cement, sand and water it is much more complex than that and according to the adjuvant that you add to it you completely change their resistance, take the case of the bridge built in China. added ash I believe to obtain a concrete which hardens quickly and especially which resists sea water ...

dac! But why offer metal piles rather than concrete (in another wire) if you know that this poses an oxidation problem? Was there a technical reason?

you introduce yourself :

I introduced myself to the admin, because there was no post or thread for that.
sorry (otherwise I have filled in my profile).

[bidouille23]

Hello (it costs nothing to say hello )

Inevitably if you mix everything you have is not history.

I invite you to re-read my previous answer and to do some research on the net concerning the interest of making the scrap steel redden before pouring around.

Then I invite you to go to the technopieux site to see what it is exactly, after if you have any questions actually I would like to answer ....

http://www.technopieux.com/fr/accueil/


If I ask you how to cook cabbage while I am making a fruit salad, I am not sure that the understanding is at its maximum for the one as for the other and that the result is that expected n 'is not ?... ;)

So here do not mix fruit and vegetables please, and take the time to read the subject from the start it will save everyone time, and above all avoid losing it.
So between pouring reinforced concrete and deep foundation there is a world that separates them, as in the formulation of concrete according to the destination of use (but I repeat I already said above;)) ....

Take the time to read really not just fly over ... here the subject is short certain are more than 180 pages so do not be discouraged ....

Sincerely

[chatelot16]

it's a small, simple wall that easily stands up by its own weight ... so there's no need to put reinforced concrete in it ... it has lasted for a century in stone ... it will hold a few more centuries in stone and cement

it is useful to arm the concrete when you want great resistance to put less thick concrete: floor slab ... window lintel ... bridge

for a small wall well laid on the ground no need for iron

[bidouille23]

re,


Chatelot, I do not say the contrary this say there is armed and armed, personally I persist in saying that as long as to make an excavation for treated the side which poses problem as much to add a flying buttress (simple and not necessarily heavily armed , but still armed, who can do the least the least), in all cases it is the good drainage and evacuation of the water, which will help to have a very good stability over time ...