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#51 2018-04-01 10:38:48

elderflower
Member
Registered: 2016-06-19
Posts: 743

Re: Greenhouses

Freeze/thaw will eventually destroy almost any porous material, as will salt exfoliation. If it never takes up water and thaws this might not be an issue.

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#52 2018-04-01 12:24:09

Oldfart1939
Member
Registered: 2016-11-26
Posts: 1,259

Re: Greenhouses

I'm again "late to the party," on this discussion. Making bricks that are strong and impervious to moisture infiltration can be accomplished through the nascent Mars chemical industry by use of a mixture of resin monomers as the "glue" to hold regolith together. I've harped on this method of brick making before. Using Robert's list of plastic monomers available by ISRU, we can come up with a regolith-polymer blend something similar to an ABS plastic as the matrix for the regolith. Since Mars has a 0.38 g gravity, we can make these "bricks" a lot bigger and use an epoxy-type "mortar." I'd suggest at least a 16" wall thickness made from bricks dimensionally 12" x 16" x 24". Even with Mar's lower gravity, these will be heavy. Any structure will be structurally robust and stable. In order to make these capable of being easily handled, I suggest they be made in a manner similar to concrete blocks and having voids in them to save on materials and subsequently reduce their weight. These should be impermeable to gasses and any moisture. If structures are built from them, they should be double-walled, and the space between walls filled with a foamed in-place polystyrene foam as insulation.

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#53 2018-04-01 13:50:27

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 11,375

Re: Greenhouses

Why not mix it up like a cement and pour it into a form that can be gently heated to make the brick materials cure.
So what will we have early on to create forms from?
One solution is to use the cargo lander shell materials if we have torches to cut it from the frame of the unit to fashion them into what we desire.

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#54 2018-04-02 17:46:13

Oldfart1939
Member
Registered: 2016-11-26
Posts: 1,259

Re: Greenhouses

SpaceNut-

That's precisely the way these would be made; a small system could be brought from Earth to make these. The initiator is called AIBN (azo-bis-isobutyronitrile). It's a very effective free radical generator and polymerization initiator. It initiates polymerization at 65 degrees C. A cure time is probably going to be 12 hours from start to finish. The mould needs to be heated for maybe  half that time to initiate the reaction, then the final cure in a 70 degree C oven. Styrene has a large exotherm on polymer initiation, so keeping the styrene content fairly low would be advised. This would be a great experiment for the Desert Research Station!

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#55 2018-04-03 04:29:28

elderflower
Member
Registered: 2016-06-19
Posts: 743

Re: Greenhouses

If you are casting in a form, why not use a dome segment form rather than bricks? Add some fibre (basalt?) for tensile strength.

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#56 2018-04-03 07:23:31

Oldfart1939
Member
Registered: 2016-11-26
Posts: 1,259

Re: Greenhouses

elderflower-

In a dome shaped structure, every course of the bricks would require a different shape and size. I'm using the KISS principles. Simple is better for the early settlers.

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#57 2018-04-03 16:40:46

louis
Member
From: UK
Registered: 2008-03-24
Posts: 3,058

Re: Greenhouses

Basalt can be very useful e.g. for lining and supporting walls, floors and trenches.  There is no shortage of basalt on Mars.


Let's Go to Mars...Google on: Fast Track to Mars blogspot.com

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#58 2018-04-03 20:08:46

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 11,375

Re: Greenhouses

But what is the equipment energy, mass of it to just get it to a site for processing with what is that equipment plus energy needs, what are the other support equipment ect.....when we look at these we now know that we are going to need to wait for a means to not only deliver the mass but the energy requirement of an end to end solution which for Louis is the BFR train of cargo landers.
So the question would sub scale production since we are not building a city just a small building at a time to which we can keep building on as a toehold is now a foothold and so on with each present state mission design.

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#59 2018-04-03 20:13:47

louis
Member
From: UK
Registered: 2008-03-24
Posts: 3,058

Re: Greenhouses

Also there are now robots that can weed.


Let's Go to Mars...Google on: Fast Track to Mars blogspot.com

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#60 2018-04-03 23:03:59

RobertDyck
Member
From: Winnipeg, Canada
Registered: 2002-08-20
Posts: 5,270
Website

Re: Greenhouses

How Bricks are Made?
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLDFKDFdNgA893bVz9nYSH1BWhjx_Q

How It's Made Bricks
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLCDNiJ3yTPwb3Txhs8HluIlRGWjmA

Bricks House In Real Life How To Make It
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLDke3T9aQROphZBnkvBuVht2dTEAQ

How to make Roman concrete
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLB1fXldP9E0AjyerSwK9SNPOCRx2w

How To Make Improvised Roman Concrete (Corporal-Crete)
Using Artificial Pozzolans like Terracotta and Red Brick Dust as Substitutes for Volcanic Ash to create a Modern Version of Roman Concrete
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLAzVyX2r5dMGxEZE71Zaus4b7EfAA

Making Bricks with Josh at Mobile Brick Factory in Baltimore
Brickmaker and ceramics artist Josh Copus demonstrates the handmade brick making process. The Brick Factory has moved to different neighborhoods in Baltimore where the public have been leaving their marks for history, stamping their stories of place, words of wisdom and art onto bricks in conjunction with the Imagining Home exhibit with BMA resident artist Marian Glebes. The bricks will eventually be part of a public art sculpture, installation or walkway.
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLC3FzTJ7tkKTzVWIdYXBxM4MLO3eA

Latest Technology 2017 - Brick Making Machine Compilation - Building Work
hqdefault.jpg?sqp=-oaymwEXCNACELwBSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLA3_EKKOxtk7bzAm0PtGvGTJ2qGzA

Last edited by RobertDyck (2018-04-03 23:18:12)

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#61 2018-04-04 06:03:22

elderflower
Member
Registered: 2016-06-19
Posts: 743

Re: Greenhouses

Oldfart. In a hemispherical dome all 5degree square bricks would be the same All ten degree square bricks would also be the same. They just wouldn't have sides mutually at a right angle.

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#62 2018-04-04 17:00:24

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 11,375

Re: Greenhouses

Since small bricks leak why not do a dual wall with the sealing with the mix of AIBN as Oldfart like motar between the layers and then as concrete wall as indicate would work as a means to pour the sealing wall in between the bricks to make a thick wall for the internal pressure.

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