Design of cc pavement by IRC 58

Design of cc pavement by IRC 58

1. Design of cc pavement according to IRC-58:2012 Pavement Design Bhavya S. Jaiswal Btech civil, Mtech Transportation Engineering

2. Design of cc pavement according to IRC-58:2012 2 Make a typical cross section of the rigid pavement : PQC Separation Layer DLC/Cement Drainage Layer Sub Grade Prepared by: Bhavya S. Jaiswal

3. Design of cc pavement according to IRC-58:2012 3 Take a trial thickness as 0.25m to 0.30m According to the CBR% given, find the modulus of the subgrade reaction from Pg:9, Table:2 Provide 100mm or 150mm thick granular sub-base ; however, the 150mm thick base in generally preferred. Provide DLC subbase of thickness 150mm with a minimum 7-day with the compressive strength of 7mPa. Find effective modulus of subgrade reaction for combined foundation of subgrade + granular & DLC subbase according to Pg:12, Table:4 Provide a bonding layer of polyethene sheet of 125micron thickness between DLC and slab. Prepared by: Bhavya S. Jaiswal

4. Design of cc pavement according to IRC-58:2012 4 Selection of flexural strength of the concrete: 28-day flexural strength of cc = 4.5 mPa (minimum) 90-day flexural strength of cc = 4.5 1.1 = 4.95 mPa Traffic analysis : ]   Where, Traffic = given traffic (for 2 direction; CVPD) r = rate of growth of traffic n = design life (years)   Prepared by: Bhavya S. Jaiswal

5. Design of cc pavement according to IRC-58:2012 5 Various Traffic volume values in MSA: Total 2-way axle load during design period = C Avg. No. of axle given Number of axle in predominant direction = (1) (if 2lane, 0.25 if 4 lane) Night time 12hrs design axle repetition = (2) given night traffic % Day time 12hrs design axle repetition = (2) (1-given night traffic)% Day time 6hrs repetition = (4) 2 The Bottom up cracking = (5) Night time 6hrs repetition = % of vehicle travelling during night time The top down cracking = (7)   Prepared by: Bhavya S. Jaiswal

6. Design of cc pavement according to IRC-58:2012 6 Make a table for BUC and TDC according to the given proportion for various axle categories; as an example… Axle category Proportion Bottom up crack Top down crack Front single 0.50 (6) 0.50 (8) 0.50 Rear single 0.10 (6) 0.10 (8) 0.10 Rear tandem 0.20 (6) 0.20 (8) 0.20 Rear tridem 0.20 (6) 0.20 (8) 0.20 Axle category Proportion Bottom up crack Top down crack Front single 0.50 Rear single 0.10 Rear tandem 0.20 Rear tridem 0.20 Than go for the analysis of Top-down and Bottom-up cracking Prepared by: Bhavya S. Jaiswal

7. Design of cc pavement according to IRC-58:2012 7 Apply the equation of relative stiffness as…   Where, = effective modulus of subgrade = elastic modulus of concrete ; 30,000mPa = Poisson's ratio = Trial thickness And take, unit weight of concrete, 24KN Temperature differential for day = Pg:7, Table:1 Temperature differential for night =   Prepared by: Bhavya S. Jaiswal

8. Design of cc pavement according to IRC-58:2012 8 Assume the Beta factor as 0.66 if it is not given and find out all the values of CFD and the if the CFD<1 than the design is SAFE !! And if CFD>1 than the pavement is to be REDESIGNED !! Prepared by: Bhavya S. Jaiswal

9. References 9 IRC-58:2012 The constructor : https://theconstructor.org/practical-guide/tie-bar-constructions/37378/ Engineerwing : https://www.engineerwing.com/2017/05/types-of-concrete-pavement-uses.html Dowel bars : pavement interactive; https://pavementinteractive.org/reference-desk/pavement-types-and-history/pavement-types/dowel-bar/ Prepared by: Bhavya S. Jaiswal