You might take a look at PVA (polyvinylalchohol) fibers. This has very good pull out resistance, won't make the slab 'fuzzy' because it doesn't float and lends itself to better mixing/distribution. At 12mm a 1.6 pound per yard mix is a good starting point, up to around 2 pounds.
In larger...
re: waterproofing concrete
There is a product called 'Densicrete' that you should take a look at from WickTek (www.wicktek.com) This has been used for years in waterparks, commercial roofs, etc., but is still rather unknown. Independent lab tests as well as actual years in the field have shown...
I'm not exactly sure if you are asking about surface damage or structural, but I'll assume you mean surface.
Increasing the density of the concrete (see densicrete www.wicktek.com ) will certainly help, and there are also coatings ( see www.spraycrete.com ) that will help a lot. I think that...
Thanks for the kind words. Here's more specific info -
Flat Roof -
I can buy EPS foam in 8" thick sheets for almost exactly $1 per foot. EPS gives an R value of 4 per inch, so 8x4=R32. Lay a solid layer of this on top of the shoring. Next we need beams. It's trivial to setup an...
I would suggest you take a look at DensiCrete. www.wicktek.com
This is a one time permanent application that is used by waterparks, PA DOT, commercial roofing, etc. It is applied via a low pressure (Hudson garden type even) sprayer and will not only provide waterproofing, but will mitigate...
First of all notice that I'm NOT a strucural engineer. But I am building a mostly concrete home, and have faced some of the same issues. A few things to consider -
1. Overhead slabs without insulation will transmit a lot of contact noise. Not much ambient noise though. Tap shoes suck.
2...
Does anyone have any vertical load data on corrugated steel pipe? We need to construct a support column with an internal chase. So using an outer pipe of 34", and an inner pipe of 24", and then pouring between the two is the plan.
The only data I can find so far ignores any value of...