masonry connection to concrete

huangyhg

masonry connection to concrete
hi,
i have just joined eng-tips so i hope that i can get an answer to this question. i have to design an 8ft tall, 8in cmu wall to an existing concrete slab so i am wondering where i can find details or information on doweling requirements and epoxy use.
can anyone help or direct me?
thanks.
check out our whitepaper library.
the simpson catalog has a lot of information on their epoxy for retrofitting and the same material could be used in this application very easily for doweled-in rebar.
a few questions:
is your connection "simple" requiring less embedment, or does the connection have to resist moment?  is the new cmu wall bearing and/or shear, or is it only a partition wall?  do you know the depth of the existing strip footing, or will you have to sawcut and create a new strip footing to take the load?  
your answers reflect the required embedment.  logically, if you have to sawcut the slab to create a new footing, you will not need to epoxy the dowels.
mike mccann
mccann engineering
is the wall supported at the top or is it cantilevered?
dik
you also probably can try- hilti hit re-150 or re-500, hilti anchorfix adhesive etc. all of these are widely used epoxies for retrofitting, doweling-in.
try the web site-
the reason i asked if the wall was cantilevered is that it may not be necessary to dowel the wall to the slab.  mortar bedding on clean dampened concrete and lateral support at the top.  depending on jurisdiction and practice, you may be able to use 6" cmu's for 8' height.if you are required to provide dowels, then the hilti hit system, noted by shin25, is one of the better ones.
dik
thanks for the help all.
the wall is cantilevered so it will have to resist moments at the base, and it is essentially a partition wall. i am not sure of the thickness of the existing slab but i have been told to assume that it is 6inches thick. i cannot sawcut through the slab due to certain restaints so it means that the slab has to be doweled into, to connect the wall.
i will refer to the website suggested though.
depending on the loading, an 8" cmu wall cantilevered 8' may be a bit dodgy... anchorage would be critical and also rebar splices are normally greater...
dik
if you are not certain of the slab thickness or reinforcing, can you be certain that the slab will be able to withstand the moment it receives from the base of the wall?
i know that not knowing the slab thickness is also a problem. but for now, i am required to come up with some preliminary rebar for the wall and method of connection between the new wall and the existing slab.
i just graduated so i guess i assumed that doing things this way (making assumptions) is common.
if your assumptions are wrong, how do you propose to fix the failure?
i dont think that they intend to build the wall until all the relevant information becomes available because that will place liability on us should there be a failure. however, they do want some kind of design or preliminary drawings to start with.