Long Term Deflection vs Time 1

[sybie99]

For a flat slab, I have been trying to find some info on deflection vs time, for example a graph.

Given a constant load, what is the typical rate of deflection? I know it depends on MANY factors, humidity, time of 1st loading, rebar etc.

But a general estimate. Say the maximum a slab will ever deflect is 100%, how many years does it take before the increase in deflection slows down significantly? Say a slab is cast today, and only carries its selfweight for its lifespan, how much is the deflection in the 1st month, the 1st year, as a percentage of the total expected deflection?

There must be some general trend given "normal" conditions?

 

[Tomfh]

Look at the graph at the end of this paper:

http://www.tlbengineers.com/tech/TLB_TechnicalNotes_Deflection.pdf

 

[sybie99]

Thanks Tom,

that is exactly what I was after, much appreciated.