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There is some pressure to make the Chinese reform their currency manipulation, so why should you care? Chinese products are artificially cheap now, U.S. products artificially expensive. If corrective...

I hope I am not repeating. In the current issue of Civil Engineering, there are two places where "waterless concrete" is announced for possible use in poured in place structures on the moon. Peter...

The reference in your note about the combination of shafts with EG somehow made me think of a definintion of a race car frame by Michael Costin, (half of Cosworth Racing). Anyway he said that a car...

The forum is castigating me for not posting, and rather than be tossed into the outer darkness I post herewith. At one time at least, the goal of the thread was the answer to the following question:...

Reading this:

it may have been posted before rent one of these to vibrate
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
might be...

I just checked into the last page after a long absence. I would point out that if you over apply the vibrator to the concrete it will segregate. A bad thing. Also if you search for concrete...

Could you use one of the small oxy-acetylene torches? Here's a site if it o.k. to post same: http://www.tinmantech.com/
I have been trying to learn and getting things too hot too quick is not a...

The discussion that I would prefer over global warming is the ability of the planet to sustain human, (my) life, at some level of quality, (keep as many plants and animals as possible). Is there the...

The global warming thing is an attempt to get the attention of the newspapers and politicians, because if you don't make it simple and dramatic they ignore it. The real question is: Are the...

JerryRig makes a good point. Before there was miners black lung, there was silicosis. Before the invention of the water cooled rock drill, the miners would work in a cloud of dust all day. If the...

CKelloug
I think that vacuum is one the places where the 90/10 rule works. You can get 90% of the vacuum by spending 10% of the money. The other 10% will cost the 90%. A single stage home size...

Harryn,
It is off topic, but I was wondering where the advantages of the Honeycomb come in. If you had a 16" wide sandwich with 1/8" aluminum sheet on both sides of a 3/4" honeycomb and turned it...

CKelloug,
The E/G may work well for you. I think as filler or as a table you are pretty much there. For a gantry, where stiffness is the premium quantity, there are fun things to mess with:...

Thanks Walter!,
I'm not an engineer, I've just observed them in their natural habitat. They say that engineering is part using appropriate technology for a cost effective solution.

It seems like...

I know this is awful lazy of me, but I came into this thread at about page 104, and I wonder if someone could point me to a spot that describes what it is that we are building, and what we want to...

Ckelloug,
I wonder if you aren't asking too much of this material. The exposed aggregate can be provided by grinding it back, like a terrazzo floor. The casting detail can be helped by going to a...

One last post, then it's off to dinner for me. The aggregate plants have been working on the size recipe for ever. They call it the gradation, and it is the specification that they are judged on. I...

Now you have done it, you encouraged me..Probably the best thing that concrete does is that it is strong in compression. The trade is that it is weak in tension. The tension part is related to the...

First post to this forum, so please forgive me if I break any rules. The aggregate, (filler) is very familiar to me from concrete. In concrete, strength is the key characteristic. Here damping is...