http://www.groundtest.co.nz/scala/scalapage4cbr.php

This chart gives you a CBR value but i dont think its a good idea to try and directly correlate a CBR to a kPa value.  

It also depends on the application.  If your installing a slab the CBR test will not model the Stresses generated by a loaded slab at a depth much greater beneath the surface.

There was a thread on this before you can find it here in google cache (the orignal post does not work for some reason):

http://209.85.229.132/search?q=cache:gekHu81BL0MJ:www.eng-tips.com/viewthread.cfm%3Fqid%3D236074%26page%3D1+convert+CBR+to+bearing+capacity&cd=5&hl=en&ct=clnk&gl=uk

Thanks. I saw that chart today, but what I'm after is a chart that i've seen before, possibly from NZS 4402 with regard to Scala Penetrometer tests, or maybe from elsewhere, I'm not sure. It has Scala results along the bottom of the chart in mm/blow, and on the left handside it shows the relative bearing capacity in kpa, so that for instance you can see that 25mm per blow equals the 300kpa ultimate that NZS3604 requires. Have you come across that chart by any chance?

I'll talk to a couple of Kiwi friends I have and see if they know of it.  Stay patient - Ooooohhhhhhmmmmmm!

Thanks guys. I just found the original version. It was put forward by Stockwell in the NZ Engineering magazine, back in 1977. After a loooooooong time searching on the net I found it on the IPENZ (NZ inst of eng) website. Duh. Should have looked there in the first place. Here is a link to the scanned pdf copy of that mag for any who are interested. The article starts at page 132 and the tables follow.

http://www.ipenz.co.nz/ipenz/publications/engineering-NZ/volume32-1977/default.cfm

It is the June 1977 copy that has the article.