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Old 25-08-2009, 02:11 PM   #1
chris
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Default Hemp Conctrete:7 times stronger, Half the Weight

Buildings account for thirty-eight percent of the CO2 emissions in the U.S., according to the U.S. Green Building Council, and demand for carbon neutral and/or zero footprint buildings is at an all-time high. Now there is a new building material that is not just carbon neutral, but is actually carbon negative. Developed by U.K.-based Lhoist Group, Tradical® Hemcrete® is a concrete substitute made from hemp, lime and water. What makes it carbon negative? There is more CO2 locked-up in the process of growing and harvesting of the hemp than is released in the production of the lime binder. Of course the equation is more complicated than that, but Hemcrete® is still an amazing new technology that could change the building industry.

Good looking, environmentally friendly and 100% recyclable, Hemcrete® is as versatile as it is sustainable. It can be used in a mind-boggling array of applications from roof insulation to wall construction to flooring. It is seven times stronger than concrete, weighs half as much, and is less prone to cracking. Hemcrete® is also waterproof, fireproof, insulates well, does not rot and is completely recyclable. In fact, the manufacturers say that demolished Hemcrete® walls can actually be used as fertilizer!
Available for years in the U.K., Hemcrete® is only now finding its way into North America. The species of hemp used to manufacture Hemcrete® is illegal to grow in the U.S., making Hemcrete® an expensive option for U.S. builders for now. As pressure for more sustainable building materials grows, lawmakers are certain to revisit this and other similarly restrictive statutes, particularly if there is money to be made. And judging from the success of Hemcrete® in Europe and elsewhere, there is plenty to be made; it is so profitable overseas that Hemp Technologies, one of the biggest manufacturers of hemp products in the UK, is actively recruiting as many new growers as it can.


http://www.inhabitat.com/2009/08/24/...than-concrete/
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Old 25-08-2009, 02:18 PM   #2
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Yet another amazing use for this versatile little plant.
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Old 25-08-2009, 02:20 PM   #3
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Originally Posted by soothseeker View Post
Yet another amazing use for this versatile little plant.
Exactly. Particle board made from hemp is 3 x stronger than plywood.

Hemp and marijuana are great. It's just that they threaten several billion dollar industries....
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Old 25-08-2009, 02:22 PM   #4
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What about this response on the page itself though?


Dead_Unicorns Says:
August 24th, 2009 at 6:13 pm

I can’t even enumerate all of the problems with this. But. here is a small list:

1. Cellulose aggregate concrete(Hemcrete) is NOWHERE near 7 times stronger than stone and sand aggregate concrete. Their claim is a flat out lie! In fact, their website states that the compressive strength is so low that it can’t be used fro load baring applications.

2. Doesn’t rot is an exaggeration that may be arguable. But, the mold problems with cellulose construction is a very real issue.

3. Insects, specifically termites are a real issue despite the manufacturer’s claims.

Cellulose reinforced construction is nothing new. It was used in ancient Egypt and in the Great Wall of China. But, as time and technology advanced, we found better construction materials. The new materials were stronger, cheaper, more durable and easier to manufacture. Not necessarily in that order. Hell there are better cellulose base construction materials already in common use. It’s called wood!

This is yet another by hemp growers to find a market for their product that nobody seems to want. Whether it’s hemp clothing or construction materials, no one, except for a few Birkenstock wearing granola crunchers is interested in hemp anything.
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Old 25-08-2009, 02:26 PM   #5
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Originally Posted by drooh View Post
What about this response on the page itself though?


Dead_Unicorns Says:
August 24th, 2009 at 6:13 pm

I can’t even enumerate all of the problems with this. But. here is a small list:

1. Cellulose aggregate concrete(Hemcrete) is NOWHERE near 7 times stronger than stone and sand aggregate concrete. Their claim is a flat out lie! In fact, their website states that the compressive strength is so low that it can’t be used fro load baring applications.

2. Doesn’t rot is an exaggeration that may be arguable. But, the mold problems with cellulose construction is a very real issue.

3. Insects, specifically termites are a real issue despite the manufacturer’s claims.

Cellulose reinforced construction is nothing new. It was used in ancient Egypt and in the Great Wall of China. But, as time and technology advanced, we found better construction materials. The new materials were stronger, cheaper, more durable and easier to manufacture. Not necessarily in that order. Hell there are better cellulose base construction materials already in common use. It’s called wood!

This is yet another by hemp growers to find a market for their product that nobody seems to want. Whether it’s hemp clothing or construction materials, no one, except for a few Birkenstock wearing granola crunchers is interested in hemp anything.
It speaks for itself.

"Cellulose reinforced construction is nothing new. It was used in ancient Egypt and in the Great Wall of China" LOL!! Duh!! Those things are still standing, after thousands of years.

"Whether it’s hemp clothing or construction materials, no one, except for a few Birkenstock wearing granola crunchers is interested in hemp anything"
That's a sensible, well thought out generalization right there.....

Last edited by ronisron; 25-08-2009 at 02:26 PM.
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Old 25-08-2009, 02:28 PM   #6
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Cool, I am clueless on engineering and science stuff. Just wanted to hear folks counter arguments.
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Old 25-08-2009, 02:31 PM   #7
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Originally Posted by ronisron View Post
It speaks for itself.

"Cellulose reinforced construction is nothing new. It was used in ancient Egypt and in the Great Wall of China" LOL!! Duh!! Those things are still standing, after thousands of years.

"Whether it’s hemp clothing or construction materials, no one, except for a few Birkenstock wearing granola crunchers is interested in hemp anything"
That's a sensible, well thought out generalization right there.....
Yeah those statements show that the person is at least knowledgable on the talking points against Hemp and also that he doesn't like Hemp advocates. So it's Possible he has vested interests.

A reasonable person would be nice and state the facts citing sources "sorry to let you down but there's reason to believe that this hemp material isn't as good as this article portreys" etc...It just seems that someone is trying to bully anothers opinion rather than try to state the facts because most of the public doesn't have time to look at the science behind every article.

But that doesn't matter, the main thing is, why the hell is it restricted so much? You can breed sage to become copious in THC but that isn't an illegal herb.

There's nothing wrong with pushing for hemp growers to enjoy the same rights as barley growers.

Last edited by chris; 25-08-2009 at 02:32 PM.
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Old 25-08-2009, 02:33 PM   #8
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Old 25-08-2009, 02:35 PM   #9
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I remember being told Du pont lobbied to have it banned in the early 20th century since they had only just patented ... plastic.

Might be totally wrong, but I heard you can make a plastic type material from none other than hemp.

I too think it's strange how restricted it is.
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Old 25-08-2009, 03:26 PM   #10
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Its been banned in America as dollar bills are printed on hemp paper. I think it was in the mid 80's. Hard to remember when I had the idea now.
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Old 25-08-2009, 03:39 PM   #11
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Model T was to be run on hemp oil. Just another reason Henry Ford was attacked, along with for producing The Dearborn Independent
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Old 25-08-2009, 03:47 PM   #12
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Model T was to be run on hemp oil. Just another reason Henry Ford was attacked, along with for producing The Dearborn Independent
Model T was also to be made with hemp plastic:

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Old 25-08-2009, 05:14 PM   #13
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I was aware of hemp application in paper, rope, and other things, but I wasn't fully aware of it's versatility and strength. The bit with the model T was pretty neat. I'm going to share that with some friends, thanks Rodin and kasalt.
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Old 25-08-2009, 07:05 PM   #14
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When it comes to Hemp this poem say it all
Quote:
ODE TO LAUGHING GRASS
By John C. "The Engineer" Turmel
Aug. 16, 1994 Hemp Rally in Toronto Canada
(To the tune of "Glory Glory Halleluiah")

Throughout all history, hemp's been a plant of great repute,
Four months to grow a mini-tree of twenty foot from shoot,
More oxygen converted from dioxide-carbon smogs,
Four times more wood than forestry can chop trees into logs.
A hardy plant, insecticides and fertilizers, not,
It grows so tall the shade kills weeds for fertile garden plot.
With petro-fuels with sulfur being burned into the air,
A fuel of bio-mass would help environmental care.

REFRAIN:
Hemp protects human environment,
Hemp prevents human defilement,
Hemp promotes human achievement,
God's gift for certain life.

Hemp fuel, hemp paints, hemp varnishes, hemp fibers, cloth and rope,
Hemp fertilizer, oil and plastics, medicines of hope.
It's source of protein primary for man and beast alike,
The best plant used for finger in environmental dike.
While alcohol debases, vibes of negative grow strong,
God's laughing grass makes calm and jolly, wishing no one wrong.
There's never been recorded death from using hemp, they say,
It's sedative that fits receptors in our DNA.
REFRAIN

The industry of dirty petro-chemicals may fear,
It's nature's agri-chemicals we'll substitute, it's clear.
For crops of untold uses which can soon be realized,
Our greatest source of bio-mass must first be legalized.
The chance that we may yet evade environmental doom,
With planet's fastest-growing vegetable, no need for gloom.
The Abolitionists charge that "On lies are based these laws."
Abolishing hemp prohibition is our second cause.
REFRAIN
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Old 25-08-2009, 07:25 PM   #15
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Hemp Resource

When it comes to versatility, Hemp is one of nature’s wonder materials. Not only is it natural, renewable, sustainable and eco-friendly but it can also be used for more applications that you’d care to imagine. This humble plant can provide food, fuel and fibre and is present in just about every aspect of our lives although sadly much less than it was.

But the single greatest thing about Hemp is that we can just keep on growing it – and as long as we do we’ll never run out of it. How great is that?

Building and Industry

Hemp can be made into Plaster Board
Hemp can be used for insulation
It can even be made into concrete, Hempcrete

Farming

A Hemp crop produces nearly 4 times as much raw fibre as an equivalent-sized tree plantation
Hemp needs no pesticides because it is unpalatable to insects
Hemp needs no herbicides because it grows too quickly for any weed to compete
Hemp grows very close together which helps prevent weeds from growing in the crop
For more than a thousand years Cannabis/Hemp was our planet's largest agricultural crop. It produced the majority of earth's fibre, fabric, lighting oil, paper, incense and medicines, as well as being a primary source of protein for humans and animals
Hemp uses the sun more efficiently than virtually any other plant on the planet
Hemp can grow in virtually any climate and soil condition. It is excellent for reclaiming otherwise-unusable land

Fabric

The word 'linen', until the early 1800s, meant any coarse fabrics made from Hemp or flax
Hemp cloth repels up to 95% of UV rays when woven into a tight construction
Hemp is more water absorbent than cotton and has 3 times the tensile strength

Food

Hemp seed does not contain the anti-nutrient trypsin inhibitors as found in soy milk
Hemp Milk can be made into Hemp milkshakes and Hemp ice-cream
Hemp oil is full of essential (and healthy) fatty acids, that aid a balanced diet

Fuel

Hempseed oil is said to burn the brightest of all lamp oils, and has been used since the days of Abraham.
Scythians used to purify and cleanse themselves with Hemp oil, which made their skin "shining and clean"
Hemp offers a valuable and sustainable fuel of the future
Hemp has an output equivalent to around 1000 gallons of methanol per acre year. Methanol is currently being studied as a primary fuel for automobiles, hopefully reducing CO2 levels
Henry Ford dreamed that someday automobiles would be grown from the soil. The Ford motor company, after years of research, produced an automobile with a plastic body. Its tough body used a mixture of 70% cellulose fibres from Hemp. The plastic withstood blows 10 times as great as steel could without denting! Its weight was also 2/3 that of a regular car, producing better economy. Henry Ford was forced to use petroleum due to Hemp prohibition. His plans to fuel his fleet of vehicles with plant-power also failed due to Alcohol prohibition at the time

History

"The earliest-known woven fabric was apparently of Hemp, which began to be worked in the eighth millennium (8,000-7,000 BC)" says Columbia History of the world, 1981
Cannabis oil was mentioned by name in the Bible. Apparently, etymologists at Hebrew University, Jerusalem confirmed that ‘kineboisin’ (also spelled ‘kannabosm’) referred to cannabis used in a holy ointment. See Exodus 30:23.
In Elizabethan times, farmers were fined for not growing Hemp
Napoleon's principle reason for invading Russia in 1812 was due to Russian Hemp supplies
The war between America and Great Britain in 1812 was mainly about access to Russian Hemp

Health

Hemp seed, contain all the essential amino acids and essential fatty acids necessary to maintain healthy human life.
No other single plant source has the essential amino acids in such an easily digestible form
Hemp seeds have a perfect a ratio of essential fatty acids to meet human nutritional needs
Hemp oil can stimulate hair and nail growth
Can help prevent heart attacks, due to omega 3 oils in hemp.
ALWAYS CHECK WITH A PROFESSIONAL BEFORE CHANGING YOUR DIET
Paper

Until 1883, more than three quarters of the world's paper was made from Hemp fibre
80% of English wood pulp is imported, destroying the forests and their delicate eco-systems in Canada and Scandinavia
Trees take approximately 20 years to mature. Hemp takes 4 months
Environmentally-sound Hemp paper is stronger, finer and longer-lasting than wood-based papers
Hemp paper is used for bank notes and archives
Hemp paper does not need chlorine bleach, which heavily pollutes rivers near wood-pulp paper mills
Much of the world's paper was made from Hemp until about 1850. Since the 1900s, all newspapers and most books and magazines were printed on wood-pulp paper
Our forests, what is left of them, are being cut down 3 times as fast as they can grow
Green Rizla papers are made from Hemp
http://www.hempfabric.co.uk/hempresource.asp

Last edited by rodin; 25-08-2009 at 07:28 PM.
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Old 25-08-2009, 07:28 PM   #16
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Exactly. Particle board made from hemp is 3 x stronger than plywood.

Hemp and marijuana are great. It's just that they threaten several billion dollar industries....

is'nt that the truth !!!
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