1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Thermal Expansion of concrete

  1. Jan 28, 2010 #1
    1. The problem statement, all variables and given/known data

    A concrete highway is built of slabs 14 m long (20 degrees Celsius)
    How wide should the expansion cracks between the slabs be (at 15 deg Celsius) to prevent buckling if the range of temperature is - 30 deg Celsius to 48 deg C?

    2. Relevant equations
    [tex]\Delta[/tex]L=[tex]\alpha[/tex]L_0[tex]\Delta[/tex]T


    3. The attempt at a solution
    Coefficient of Linear expansion ([tex]\alpha[/tex])for concrete at 20 deg C = 12*10^-6

    [tex]\Delta[/tex]L = (12*10^-6)(14m)(48-15 deg C) = .005544 m

    [tex]\Delta[/tex]L = (12*10^-6)(14m)(-30-15 deg C) = -.00756 m

    Total range = .0055m + .0076m = .013m
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted