Advanced Cement Composites


(George Hawirko) #27

Getting back to the EPS, in the range of 92-98% air you can save on Shipping Handling and Storage of the necessary basic building materials. You will also notice that the Cells can be replicated for the many othe Components needed during construction.


(George Hawirko) #28

Seasteading and Concrete go together for longterm quality Infrastructure. Composite Concrete comes in hundreds of variations and actually needs it’s very own Manuals. Composites need redefinitions and understanding, for example,

Ferrocement as I describe it leaves out the Ferro and substitutes the Cement with Concrete. Steel is best removed from Composite Concrete to reduce maintenance and weight.

Thin-Shell, Composite Concrete is strengthened when EPS (Expanded Polystyrene). Monolithic and Monocoque Floating Structures are possible in Super Sixes when using these techniques.


#29

If you “leave out” the ferro armature, there is no structural integrity support for that hull… Can’t do that.

“Best” for what? First, dito above. Second, there is no “maintenance” to perform to the the steel armature of a ferrocement boat. Third, reducing the weight of a seastead is overall detrimental to its stability and sea keeping abilities.


(Wilfried Ellmer) #30

Another interresting fiber / reinforcement / material in the context of saltwater resistent cement composites…


Check this study investigating the potential....

Potential of Carbon Nanotube Reinforced Cement Composites as Concrete Repair Material


Carbon nanotubes (CNTs) are a virtually ideal reinforcing agent due to extremely high aspect ratios and ultra high strengths. It is evident from contemporary research that utilization of CNT in producing new cement-based composite materials has a great potential. Consequently, possible practical application of CNT reinforced cementitious composites has immense prospect in the field of applied nanotechnology within construction industry. Several repair, retrofit, and strengthening techniques are currently available to enhance the integrity and durability of concrete structures with cracks and spalling, but applicability and/or reliability is/are often limited. Therefore, there is always a need for innovative high performing concrete repair materials with good mechanical, rheological, and durability properties. Considering the mechanical properties of carbon nanotubes (CNTs) and the test results of CNT reinforced cement composites, it is apparent that such composites could be used conveniently as concrete repair material. With this end in view, the applicability of multiwalled carbon nanotube (MWNT) reinforced cement composites as concrete repair material has been evaluated in this study in terms of setting time, bleeding, and bonding strength (slant shear) tests. It has been found that MWNT reinforced cement mortar has good prospective as concrete repair material since such composites exhibited desirable behavior in setting time, bleeding, and slant shear.


http://nautilusmaker.com/t/potential-of-carbon-nanotube-reinforced-cement-composites/4583

(George Hawirko) #31

All very important when considering the use of automated printing of Monolithic and or Monocoque Structure.


(George Hawirko) #32

Steel will always be a problem when thinking long-term, use of Composites, ie. Fiberglass, Polypropolyne to Carbon Fibers are used instead and allow for automated Construction of Hull and Components.

Weight reduction is very important for Storage and handling during Construction. If you continue using the term "FerroCemen"t you win this argument, I prefer to think of Concrete Composites and Monocoque Construction as the future we need to concentrate on.


#33

Not if built to high standards.

You mean instead of a steel armature? At what cost? Even so, you will have to prove that this new untested hull building process is far superior that the already proven old ferrocement one. Testing costs money…

Why? If a seastead will be built it will be either a small, medium or large one using either a continuous construction process (pour) or a modular construction. Regardless of which process, weight hasn’t much to do with it since an A x B x C seastead built of cardboard will have almost the same volume as one built of lead.

Since the same volume, the cost of renting an A x B building area in a boat yard will be the same.


(Wilfried Ellmer) #34

Interesting Topic in the context of Advanced Cement Composites


workhypothesis: down the road seasteads can obain their building material from the ocean…



The question of the source of the building material is of essence in the light of the asian sandwars limited supply is a potential severe problem on this scale.


Composite cement mortars based on marine sediments and oyster shell powder


(google it up)

context: floating cities-solving the technology bottleneck



(noboxes) #35

That may be true in your version of a seastead, but not mine. For one thing, any weight you add is something you bought and added to the seastead, and then had to make compensations somewhere to support that added weight.


#36

Wrong. “That” is true based on rigorous scientific fact: naval architecture, an exact science, irrelevant of anybody’s “version” of seastead.

I was talking about the total displacement of the seastead’s hull, ready to occupy and launch. What’s “added” is people, fuel, water, provisions, plus any other “cargo”.

Such “added cargo” is already compensated from the drawing board: seasteaders (visitors) quarters, water tanks, fuel tanks, provisions and other cargo holds (storage space). It’s all calculated, drawn-designed to specs and built to specs, and most importantly, when operated is managed to strictly enforce the stability letter of such seastead.

There is a lot of science that needs to be applied to seasteading in order to live @ sea indefinitely, says I.


(noboxes) #37

And that is your 20+ year concept of a thing that floats: a traditional hull that resembles a bathtub. That is not my idea of a seastead. Your idea uses the weight as a brute force to fight the waves and orient the bathtub upright. My idea doesn’t use brute force or live in the wave zone. To quote you: go see a shrink and get over it.


#38

Whatever rocks your seastead.

I did, and it’s all good. That’s why I highly recommended it to some of the people hanging around here.


(Wilfried Ellmer) #39

In the context of “advanced cement composites” and building material that is not “dependent on land based supply” consider the case of Basalt Rebar…basalt is abundant in the ocean - a civilization can be built on it …actually it is more economic and better suited for the oceanic environment than the currently used steel rebar - the only problem that holds it back is “code compliance” we can solve that issue.


Basalt Continous Fiber (BCF) especially useful for creating advanced cement bonded composite structures…


(noboxes) #40

Please explain where you will get the basalt. Please explain where you will get the huge amounts of energy used to dehydrate raw materials as dug from the ground, and convert it to portland cement.


(Wilfried Ellmer) #41

The seabed is basicly “made of basalt” and the mid ocean ridge offeres unlimited energy resources…this is not something available in phase 1 but certainly in phase 3 and beyond when the real big amounts of resources will be needed…as long as you are in the “few hundreds of tons” range you can well work with material from homecenter… it does not matter much as a cost factor. When the seastead reaches “city size” and you cross the “millions of tons range” - material supply becomes a very different issue ( look asian sandwars )…


Vent base Alpha could be a BCF (Basalt Continous Fiber ) production site…with access to ready to use basaltic magma for free…an uninhabitated volcanic island a source of roman style volcanic cement (google keywords: AL-tobermorite, roman concrete seawater, cesarea harbor concrete, pantheon concrete dome )…


The seastead does not need to move around to exploit these resources - it has “mobility by proxi” by the means of ships - like its historic model - Venice



Why Venice is not seasteading
(Wilfried Ellmer) #42

…The Global concrete fiber market is expected to grow during the forecast period (2017-2023) due to rapid urbanization and growing construction activities across the globe. Additionally, the concrete fiber market is also driven by the increasing demand for synthetic fibers in end-use industries such as transport infrastructure, building and construction, and mining and tunnel…


https://www.satprnews.com/2018/04/05/concrete-fiber-market-by-type-end-use-industryregion-trend-2023/

context google | construction activities 21st century dominated by concrete sea structures |



(noboxes) #43

See Why Venice is not seasteading


(Wilfried Ellmer) #44

Advanced Cement Composites

context : automated printing | termite-tech | projected concrete | gunnite | free-forming methods | real estate paradigm change |

• automated printing of building sized structures is on the brink to become something feasible …

• Having a sophisticated mass production line for floating housing units is on the table.

• The produced housing units can be distributed globally and effortless with little cost - on the watersurface of the planet - this opens possibilities of international global sales - normaly not available for real estate projects which are restrained to local building lots.

• This promises major leaps forward in cost per squaremeter and production efficiency.

• It is also a construction method where round shapes are not more expensive to perform than boxy shapes. This favors dome, shell, and bubble cluster construction for a Draupner impact safe floating city.

• light materials can be printed directly on the watersurface (on a sheet of plastic) - the existance of a “building lot” as most critical (and expensive) ingredient of a real estate development becomes obsolete and innecessary.

• All this sums up to a “Mayor Paradigm Change” in real estate development.

• With a population of 7,5 Billion (with a B) the whole topic of “creating housing units” needs this rapid paradigm change - suburban housing development is reaching its limits everywhere.


(noboxes) #45

It’s been feasable for several years already!

I think what is holding it back from acceptance is 4-fold:

  1. there’s no rebar in it
  2. it’s slower than pouring into forms
  3. the cement is unprotected from environment as it hardens
  4. it’s not concrete (cement plus gravel)

But it’s been documented on this forum that 3-D cement (but not concrete) printing of housing has been done in many countries.


(system) #46

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