Yes, the golf ball test for water content in the older underpinning thread sounds straightforward enough.
www.eng-tips.com/viewthread.cfm?qid=232821
I have some experience pushing cement into joints from Helifix installation (www.helifix.co.uk)
I think I'll need to put a form on one side of...
Thanks guys, very helpful.
Yes it looks like non-shrink grout is widely available here in the uk as a dry powder.
http://gbr.sika.com/dms/getdocument.get/60789a95-de17-3c9b-a7c4-00b7811aef23/SikaGrout%20212.pdf
I was at first quite keen on this solution, but the detail looks problematic -...
Also - I know this is probably also a dumb question, but I'm wondering why you can't leave a much smaller gap and pack it with a layer or two of slate as you would above a Lintel?
The general wisdom when dry packing, seems to be to have a 3-4" gap between the top of the old concrete and top of the old wall, is there a compelling reason you cant go thinner - say 2 inches?
If you trench under the wall on both sides, is it possible to ram the cement in from both sides and...
I am using a residual earth fault trip which fits onto the incomer of a 3P&N 400A MCCB; it uses a core balance ct around the 3 phases, I'm not given ct values because it comes as a package; I just have to choose the earth fault trip setting eg 0.03A-5A & trip time (0.01s-1s). The 'load' is 230kW...
