may i know what is non-shrink grout? is not cement? when to use non-shrink grout?

Non-shrink grout is a chemical mixed cement... It give better Compressive Strength compared against OPC....

It have more fine particle combination with silica and etc material..

sorry, not very understand...can explain in more detail...

usually in which situation should use it?

The product is a premium quality ready-mixed product concrete, non-metallic, high strength, with good strength development forth grouting, anchoring of structural steel, pre-cast concrete members, under pinning and filling of voids, holes, cracks, installation, jointing and grouting of concrete units and concrete repairs...

Thanks for the detail explanation bro..

What is OPC?

Ordinary Portland Cement = Normal Cement

sl2007, if want to cement back the concrete ceiling, must use non shrink grout?

plz refer this thread for my problem http://forum.lowyat.net/topic/1983764

Better to use grouting cement.. Anyhow u need to ensure all your piping works is well done prior casting with grouting cement..

Btw, seemed like you have disturbed the load bearing wall..

what if after applied the grouting cement, it cannot hack again if leaking again?

no choice, they need to hack to patch it back....

That is why fix it right the first time. Why not ask a professional plumber to check before cement it.

i had asked my current plumber...he said is ok to fix with that then cement back to give another pressure...

if cut and joint, it may come out another problem if not join properly...

For your case, that is a Poly Pipe with PN (Pressure Rating).. I not sure how your plumber solve the problem but in real fact you are required to cut-off the damage portion and rejoin it with socket..