Reinforced Brick Masonry - Time Between Grout Lifts 2

[Jerehmy]

I have a specific situation where we may use reinforced brick masonry to repair a brick wall corner that was severely damaged due to a demolition project (see repair detail below for rough schematic).

I have read through Brick Masonry Institute technical notes 17 & 17A. They say that brick can be laid in heights of about 5ft and grouted without worrying about the brick blowing out. This is great.

They do not say how long to wait between subsequent lifts so the grout has cured enough to not blow out the masonry when the next lift is made. I have also checked NCMA E-TEK 3-2A and the TMS and have not come across anything in regards to length of time between lifts for low-lift CMU grouting that I could extrapolate to brick.

Anyone have any idea how long between lifts so that the grout is at least self-supporting? I'm hoping 4 hours so that 3 lifts can be made in a day.

Thanks!

 

[WARose]

See Section 3.5 of the masonry code (i.e. Part 3-Execution of ACI 530-05). In particular, Table 7 & Section 3.5 (p.S-22 & 23). What you are talking about is feasible. 4 hours is the typical wait time.....but you can exceed that lift height under the right conditions.

 

[Jerehmy]

WARose,

I have the 2008 edition in front of me. I noticed the mention of 4 hours in 3.5D.1.a.i, but that was for the masonry, not the grout. Luckily, the commentary for 3.5D explains this 4 hour cure time more thoroughly.

Thanks! much appreciated.