MikeSharp01 Posted March 29, 2017 Share Posted March 29, 2017 Working on my new garden room slab today and dropped a hammer, did no damage but the noise it made gave me pause for thought. It 'rang' - made the slab sound very 'live'. The slab is 100mm thick at this point and the outer ring is about 2.5m in three directions and about 2.5m from the crack prevention slot. It sits on 200mm of EPS at this point. I must confess I was expecting a very dead sound but didn't get one. Have I got something wrong somewhere or is this what I should expect on the main house slab? Link to comment Share on other sites More sharing options...
Onoff Posted March 29, 2017 Share Posted March 29, 2017 Relax, job's a good'un by the sound (literally) of it: https://www.google.co.uk/amp/s/theconstructor.org/practical-guide/destructive-non-destructive-field-test-of-concrete/7147/amp/ Link to comment Share on other sites More sharing options...
MikeSharp01 Posted March 29, 2017 Author Share Posted March 29, 2017 Thanks for the link @Onoff noise just worried me, but by the looks of it is a good job as it does ring. Link to comment Share on other sites More sharing options...
Onoff Posted March 30, 2017 Share Posted March 30, 2017 Thinking back to breaking up any old concrete slab and the real tough, bastard ones would ring as the impact of the whacks reverberated up my arm through the sledge hammer! My bathroom slab makes more of a "thunk". Think it's because I have hollows all over (under?) the area due to the nominal 100mm slab being laid on Polypipe trays. Makes a lighter slab I know. No signs of any cracks to date, thank God for the A142 mesh. Still bugs me I forgot the fibres! Link to comment Share on other sites More sharing options...
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