Brian Micklethwait's Blog

In which I continue to seek part time employment as the ruler of the world.

Home

www.google.co.uk


Recent Comments


Monthly Archives


Most recent entries


Search


Advanced Search


Other Blogs I write for

Brian Micklethwait's Education Blog

CNE Competition
CNE Intellectual Property
Samizdata
Transport Blog


Blogroll

2 Blowhards
6000 Miles from Civilisation
A Decent Muesli
Adloyada
Adventures in Capitalism
Alan Little
Albion's Seedling
Alex Ross: The Rest Is Noise
Alex Singleton
AngloAustria
Another Food Blog
Antoine Clarke
Antoine Clarke's Election Watch
Armed and Dangerous
Art Of The State Blog
Biased BBC
Bishop Hill
BLDG BLOG
Bloggers Blog
Blognor Regis
Blowing Smoke
Boatang & Demetriou
Boing Boing
Boris Johnson
Brazen Careerist
Bryan Appleyard
Burning Our Money
Cafe Hayek
Cato@Liberty
Charlie's Diary
Chase me ladies, I'm in the cavalry
Chicago Boyz
China Law Blog
Cicero's Songs
City Comforts
Civilian Gun Self-Defense Blog
Clay Shirky
Climate Resistance
Climate Skeptic
Coffee & Complexity
Coffee House
Communities Dominate Brands
Confused of Calcutta
Conservative Party Reptile
Contra Niche
Contrary Brin
Counting Cats in Zanzibar
Скрипучая беседка
CrozierVision
Dave Barry
Davids Medienkritik
David Thompson
Deleted by tomorrow
deputydog
diamond geezer
Dilbert.Blog
Dizzy Thinks
Dodgeblogium
Don't Hold Your Breath
Douglas Carswell Blog
dropsafe
Dr Robert Lefever
Dr. Weevil
ecomyths
engadget
Englands Freedome, Souldiers Rights
English Cut
English Russia
EU Referendum
Ezra Levant
Everything I Say is Right
Fat Man on a Keyboard
Ferraris for all
Flickr blog
Freeborn John
Freedom and Whisky
From The Barrel of a Gun
ft.com/maverecon
Fugitive Ink
Future Perfect
FuturePundit
Gaping Void
Garnerblog
Gates of Vienna
Gizmodo
Global Warming Politics
Greg Mankiw's Blog
Guido Fawkes' blog
HE&OS
Here Comes Everybody
Hit & Run
House of Dumb
Iain Dale's Diary
Ideas
Idiot Toys
IMAO
Indexed
India Uncut
Instapundit
Intermezzo
Jackie Danicki
James Delingpole
James Fallows
Jeffrey Archer's Official Blog
Jessica Duchen's classical music blog
Jihad Watch
Joanne Jacobs
Johan Norberg
John Redwood
Jonathan's Photoblog
Kristine Lowe
Laissez Faire Books
Languagehat
Last of the Few
Lessig Blog
Libertarian Alliance: Blog
Liberty Alone
Liberty Dad - a World Without Dictators
Lib on the United Kingdom
Little Man, What Now?
listen missy
Loic Le Meur Blog
L'Ombre de l'Olivier
London Daily Photo
Londonist
Mad Housewife
Mangan's Miscellany
Marginal Revolution
Mark Wadsworth
Media Influencer
Melanie Phillips
Metamagician and the Hellfire Club
Michael Jennings
Michael J. Totten's Middle East Journal
Mick Hartley
More Than Mind Games
mr eugenides
Mutualist Blog: Free Market Anti-Capitalism
My Boyfriend Is A Twat
My Other Stuff
Natalie Solent
Nation of Shopkeepers
Neatorama
neo-neocon
Never Trust a Hippy
NO2ID NewsBlog
Non Diet Weight Loss
Normblog
Nurses for Reform blog
Obnoxio The Clown
Oddity Central
Oliver Kamm
On an Overgrown Path
One Man & His Blog
Owlthoughts of a peripatetic pedant
Oxford Libertarian Society /blog
Patri's Peripatetic Peregrinations
phosita
Picking Losers
Pigeon Blog
Police Inspector Blog
PooterGeek
Power Line
Private Sector Development blog
Public Interest.co.uk
Publius Pundit
Quotulatiousness
Rachel Lucas
RealClimate
Remember I'm the Bloody Architect
Rob's Blog
Sandow
Scrappleface
Setting The World To Rights
Shane Greer
Shanghaiist
SimonHewittJones.com The Violin Blog
Sinclair's Musings
Slipped Disc
Sky Watching My World
Social Affairs Unit
Squander Two Blog
Stephen Fry
Stuff White People Like
Stumbling and Mumbling
Style Bubble
Sunset Gun
Survival Arts
Susan Hill
Teblog
Techdirt
Technology Liberation Front
The Adam Smith Institute Blog
The Agitator
The AntRant
The Becker-Posner Blog
The Belgravia Dispatch
The Belmont Club
The Big Blog Company
The Big Picture
the blog of dave cole
The Corridor of Uncertainty (a Cricket blog)
The Croydonian
The Daily Ablution
The Devil's Advocate
The Devil's Kitchen
The Dissident Frogman
The Distributed Republic
The Early Days of a Better Nation
The Examined Life
The Filter^
The Fly Bottle
The Freeway to Serfdom
The Future of Music
The Futurist
The Happiness Project
The Jarndyce Blog
The London Fog
The Long Tail
The Lumber Room
The Online Photographer
The Only Winning Move
The Policeman's Blog
The Road to Surfdom
The Sharpener
The Speculist
The Surfer
The Wedding Photography Blog
The Welfare State We're In
things magazine
TigerHawk
Tim Blair
Tim Harford
Tim Worstall
tomgpalmer.com
tompeters!
Transterrestrial Musings
UK Commentators - Laban Tall's Blog
UK Libertarian Party
Unqualified Offerings
Violins and Starships
Virginia Postrel
Vodkapundit
WebUrbanist
we make money not art
What Do I Know?
What's Up With That?
Where the grass is greener
White Sun of the Desert
Why Evolution Is True
Your Freedom and Ours


Websites


Mainstream Media

BBC
Guardian
Economist
Independent
MSNBC
Telegraph
The Sun
This is London
Times


Syndicate

RSS 1.0
RSS 2.0
Atom
Feedburner
Podcasts


Categories

Advertising
Africa
Anglosphere
Architecture
Art
Asia
Atheism
Australasia
Billion Monkeys
Bits from books
Bloggers and blogging
Books
Brian Micklethwait podcasts
Brians
Bridges
Business
Career counselling
Cartoons
Cats and kittens
China
Civil liberties
Classical music
Comedy
Comments
Computer graphics
Cranes
Crime
Current events
Democracy
Design
Digital photographers
Drones
Economics
Education
Emmanuel Todd
Environment
Europe
Expression Engine
Family
Food and drink
France
Friends
Getting old
Globalisation
Healthcare
History
How the mind works
India
Intellectual property
Japan
Kevin Dowd
Language
Latin America
Law
Libertarianism
Links
Literature
London
Media and journalism
Middle East and Islam
Movies
Music
My blog ruins
My photographs
Open Source
Opera
Other creatures
Painting
Photography
Podcasting
Poetry
Politics
Pop music
Propaganda
Quote unquote
Radio
Religion
Roof clutter
Russia
Scaffolding
Science
Science fiction
Sculpture
Signs and notices
Social Media
Society
Software
South America
Space
Sport
Technology
Television
The internet
The Micklethwait Clock
Theatre
This and that
This blog
Transport
Travel
USA
Video
War


Wednesday July 16 2014

From Stuff Matters by Mark Miodownik (pp. 80-81):

Given that literally half of the world’s structures are made from concrete, the upkeep of concrete structures represents a huge and growing effort.  To make matters more difficult, many of these structures are in environments that we don’t want to have to revisit on a regular basis, such as the Oresund bridge connecting Sweden and Denmark, or the inner core of a nuclear power station. In these situations it would be ideal to find a way to allow concrete to look after itself, to engineer concrete to be self-healing.  Such a concrete does now exist, and although it is in its infancy it has already been shown to work.

The story of these self-healing concretes started when scientists began to investigate the types of life forms that can survive extreme conditions.  They found a type of bacterium that lives in the bottom of highly alkaline lakes formed by volcanic activity.  These lakes have pH values of 9-11, which will cause burns to human skin.  Previously it had been thought, not unreasonably, that no life could exist in these sulphurous ponds. But careful study revealed life to be much more tenacious than we thought.  Alkaliphilic bacteria were found to be able to survive in these conditions.  And it was discovered that one particular type called B. Pasteurii could excrete the mineral calcite, a constituent of concrete.  These bacteria were also found to be extremely tough and able to survive dormant, encased in rock, for decades.

Self-healing concrete has these bacteria embedded inside it along with a form of starch, which acts as food for the bacteria.  Under normal circumstances these bacteria remain dormant, encased by the calcium silicate hydrate fibrils. But if a crack forms, the bacteria are released from their bonds, and in the presence of water they wake up and start to look around for food. They find the starch that has been added to the concrete, and this allows them to grow and replicate.  In the process they excrete the mineral calcite, a form of calcium carbonate.  This calcite bonds to the concrete and starts to build up a mineral structure that spans the crack, stopping further growth of the crack and sealing it up.

It’s the sort of idea that might sound good in theory but never work in practice.  But it does work. Research now shows that cracked concrete that has been prepared in this way can recover 90 per cent of its strength thanks to these bacteria.  This self-healing concrete is now being developed for use in real engineering structures.

Maybe Miodownik is very good at explaining things, or maybe I am just ready to be learning this stuff.  Probably both.  I chose that excerpt because my average reader may not know about such things as bacteria which automatically repair concrete.  But the truth is that I am almost embarrassed by how much I am reading that is new to me, or only vaguely known, as a sort of historical rumour.

I had no idea, to take just one example, who invented/discovered stainless steel, or where, or how.  Now, I have a much better idea.  The story is told on page 29 of this book, which I heartily recommend to all technological illiterates who would like not to be technological illiterates.