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GSBN: Digest for 6/17/07



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-> Cemento
     by "Rikki  Nitzkin" rikkinitzkin@...
-> Re: GSBN:Cemento
     by Tom Woolley woolley.tom@...
-> Re: GSBN: Wind loads and racking
     by Andrew Webb design@...


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Date: 17 Jun 2007 12:02:11 -0500
From: "Rikki  Nitzkin" rikkinitzkin@...
Subject: Cemento

I am looking for some document with Numbers explaining why we shouldnit use
cement.

 

If anyone can send me one or direct me to a web-page I would be grateful.

 

Thanks, 

 

Rikki Nitzkin 

Aulas, Lleida (Spain)

Auto-constructora y Educadora en Construccion con Balas de Paja y Revocos de
Arcilla

Co-ordinadora Red de Construccion con Balas de Paja

 

(0034) 657 33 51 62

 <<a  target="_blank" href="mailto:rikkinitzkin@earthlink.net";>mailto:rikkinitzkin@...> rikkinitzkin@...(Personal)

 <<a  target="_blank" href="mailto:casasdepaja@yahoo.es";>mailto:casasdepaja@...> casasdepaja@...(Asuntos de la Red)

<a  target="_blank" href="http://www.casasdepaja.com";>http://www.casasdepaja.com</a>  (Red de Construccion con Balas de Paja)

"Tenemos el Derecho y Responsabilidad de Crear el Mundo en que Queremos
Vivir"

"We Have the Right and Responsability to Create the World we Want to Live
in"

 



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Date: 17 Jun 2007 14:39:04 -0500
From: Tom Woolley woolley.tom@...
Subject: Re: GSBN:Cemento

You might find

  <a  target="_blank" href="http://www.COINet.org.uk";>http://www.COINet.org.uk</a>

a useful source of info

also

<a  target="_blank" href="http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.energy";>http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.energy</a>. 
26.1.303



also



<a  target="_blank" href="http://industrial-energy.lbl.gov/node/193";>http://industrial-energy.lbl.gov/node/193</a>



October 17, 2006

Anti environmental architecture

I watched the Stirling Awards for Architecture on Saturday with a  
deep despondency.

These awards are the Booker of Buildings. Although all manner of  
croneyism, politics and fashion determines who makes the short list  
they are as good a reflection as any of what the architecture and  
arts world see as the cutting edge of new design.

Watching it I can only conclude that architects exhibit a  
particularly interesting and complex form of denial. Architects are,  
in my experience, aware people with progressive politics. As a  
profession they have a huge responsibility for causing climate change  
(the energy consumed by buildings and their materials are the single  
largest source of greenhouse gases) and a huge opportunity to develop  
the forms and structures of a low carbon economy. And, to be fair,  
they do talk about climate change a fair bit in magazines and  
conferences and books.

But the people at the top of the profession who get the Stirling and  
Pritzker prizers and the Gold medals and the gongs and the big fancy  
projects are not building anything that remotely reflects the  
realities of climate change.
This is an extremely interesting period for architecture- the most  
inventive and expressive in thirty years- and that expression is  
being achieved through technologies and materials that are the  
antithesis of a low carbon sustainable economy.

Take concrete for example. Cement has horrible CO2 emissions- very  
high temperatures are needed to slake the lime which produces yet  
more carbon dioxide as a by product. Cement manufacture accounts for  
5% of the worlds greenhouse gas emissions. If we were serious about  
climate change it would be used very sparingly indeed.

And yet the bookies favourite to win the Stirling prize was Zaha  
Hadid=92s extraordinary Phaeno Science Centre. It is is a symphony in  
=91compacted concrete=92 =96 the concrete floors sweeping up and around the  
museum to create one organic whole. It creates a thrilling new  
language for concrete that will be imitated widely.  But it pays a  
high price. It used 27,000 cubic metres of concrete which produced  
nearly 10,000 tonnes of carbon dioxide. Given that a sustainable  
level is probably not much more than one tonne of carbon dioxide per  
person per year, that is a huge footprint.

Architects adore reinforced concrete because it combines strength  
with immense sculptural potential. Another Stirling shortlist was a  
=91brick house=92 by Caruso St John, the most striking quality of which,  
despite its name, is the neo-expressionist crumpled lines of its  
concrete roof slab. There=92s an awful lot of concrete in that house.  
It pays clear homage to Louis Kahn and the formal language he  
developed 40 years ago, a long time before we knew of the impending  
collapse of the world=92s weather system.

The winner of the Stirling Prize is Richard Rogers=92 Barajas Airport.  
An airport wins the prize!  A parking garage for the fastest growing  
cause of climate change! The top architects probably spend half their  
lives in airports and are especially subject to the near universal  
denial about the impacts of flights. Yet, if we are going to deal  
with climate change this building type needs to become as obselete as  
the bear pit.

One reason that people don=92t see planes as polluting is that it  
doesn=92t feel dirty. There are no smokestacks or piles of coal. Planes  
feel (and feelings count more than reality when we assess impacts)  
very smart and white and clean. Rogers and his team have concentrated  
their creativity on creating an airport that extends that feeling-  
all open and bright and fresh.

But the openness and brightness of the interiors is made possible by  
large expanses of plate glass (and a lot of steel to hold it up).  
What we don=92t see in the pictures is the huge cooling and heating  
plant which keeps it at a tolerable temperature. No doubt Rogers, who  
speaks often about climate change (his shortlisted Welsh Assembly  
building appears to have made a serious attempt to be green), has  
achieved a very high energy design by using lots of clever technology  
and design to keep the energy load manageable.

This is the nub. Modern energy saving technology is not being used to  
create buildings with zero emissions but is enabling increased  
transparency and expressive potential. This is exactly what is  
happening in the car industry where the main market for LPG and fuel  
cells is for sports utility vehicles- the heaviest cars ever built.

And one could expand on this point endlessly. All around the world  
the best and most creative architects are using new technologies to  
push the expressive potential of their buildings. Gehry faces his  
buildings with sheets or stainless steel and titanium (the most  
energy intensive metal of all). Rem Koolhaas has built a new library  
in Seattle with entirely glass walls and roof. Work was suspended on  
Herzog and de Meuron =91s Olympic stadium in Beijing  because of the  
costs of the 80,000 tonnes of steel involved in its construction.  
That=92s 152,000 tonnes of carbon dioxide- an incredible indulgence=85and  
so I could go on. None of these designs are models for a sustainable  
future. All the  architects have won the Pritzer award- the highest  
award for architecture.

As you can tell, I love architecture but despair of what is being  
done with it. Modernism arose from an entirely valid critique that  
traditional building was not able to meet the needs and opportunities  
of the modern world. In fifty years time, as the seas are rising and  
the hurricanes are crashing every month into Florida these buildings  
will appear pathetically dated- the last decadent rococo flourish of  
the carbon age. So why, when all the scientists agree on the problem,  
are they still be built and lauded?

This article was posted on www.climatedenial.org a site which  
explores the psychology of our denial of climate change. Please feel  
free to distribute

- -- 
 >From
George Marshall,
Executive Director,
Climate Outreach Information Network,
16B Cherwell St.,
Oxford OX4 1BG
UK
Office Tel. 01865 727 911
Mobile 0795 150 4549 (I will call you back to save you the high  
charge of calling mobiles)
E-mail: george@...
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the objective of 'advancing the education of the public in the  
subject of climate change and its impact on local, national, and  
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On 17 Jun 2007, at 16:35, Rikki Nitzkin wrote:

> I am looking for some document with Numbers explaining why we  
> shouldn=92t use
> cement.
>
>
>
> If anyone can send me one or direct me to a web-page I would be  
> grateful.
>
>
>
> Thanks,
>
>
>
> Rikki Nitzkin
>
> Aul=E1s, Lleida (Spain)
>
> Auto-constructora y Educadora en Construcci=F3n con Balas de Paja y  
> Revocos de
> Arcilla
>
> Co-ordinadora Red de Construcci=F3n con Balas de Paja
>
>
>
> (0034) 657 33 51 62
>
>  <<a  target="_blank" href="mailto:rikkinitzkin@earthlink.net";>mailto:rikkinitzkin@...> rikkinitzkin@...
> (Personal)
>
>  <<a  target="_blank" href="mailto:casasdepaja@yahoo.es";>mailto:casasdepaja@...> casasdepaja@...(Asuntos de la  
> Red)
>
> <a  target="_blank" href="http://www.casasdepaja.com";>http://www.casasdepaja.com</a>  (Red de Construcci=F3n con Balas de Paja)
>
> "Tenemos el Derecho y Responsabilidad de Crear el Mundo en que  
> Queremos
> Vivir"
>
> "We Have the Right and Responsability to Create the World we Want  
> to Live
> in"
>
>
>
>
>
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> list, send email to GSBN@...HELP in the  
> SUBJECT line.
> ----
>



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Date: 17 Jun 2007 19:54:36 -0500
From: Andrew Webb design@...
Subject: Re: GSBN: Wind loads and racking

FYI design wind speeds are:
Serviceability limit state 39 m/s
Permissible stress method 50 m/s
Ultimate limit state 61 m/s

With global warming in mind it is becoming common to design for the next
higher wind class which would be 47, 60 and 74 m/s respectively.

So, it's not unreasonable to be concerned about the integrity of the
wall (as it never would be), but the proposed solution is faulty.  I
need to convince this engineer of that without making my clients the
guinea pigs.  Bruce et al's book arrived a couple of days ago.  I will
meet with the engineer again next week armed with all the information
and some good advice, thanks everyone.

- -AW


Rene Dalmeijer wrote:
> ...
> Based on the information I have on the project under question I wonder
> what loads the engineer expects to require extra cross ties between the
> plaster surfaces....



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