Sheet1DESIGN OF C.C.PAVEMENTThermal coefficient of concrete=10x10-6 per 0CCoefficient of friction=1.5Unit wieght of CC=2400Kg/CumDesign wheel loadP=5204KgWheel Pressure1/2 =7.14Kg/SqcmRadius of contact areaa = P/p ==15CmE Value of concreteE=3x105 Kg/SqcmPoisson's Ratiou=0.15Lane widthLx=375CmSpacing of contraction jointsLy=375Cmi)Modulus of reaction of sub base(k):-The modulus of sub grade reaction(k) corresponding to CBR value of 5% fromTable(1) of IRC SP 62-2004 is 4.2Kg/cm2/cmThe C.C pavement is proposed over the existing base course of 75mm thickWBM Gr-III .Hence the k value can be increased by 20%Hence effective 'k' value is5.0Kg/Sqcm/cmii)Flexural strength of concreteMinimum design mix of M30 is recommended by the clause 3.6 ofIRC SP 62:2004Using M30 grade concrete,flexural strength is 0.7fckHence,the 28-day flexural strength =3.83MpaFor rural roads,it is suggested that the 90-day compressive strength may be usedinstead of 28-day compressive strength,as prescribed by the code.Taking 90-day flexural strength for design purpose45.96Kg/SqcmAssume slab thicknessh=20CmRadius of relative stiffnessl=Eh31/412K(1-u2)=79.82CmRadius of load contact assumed in circular a =15Cma/h=0.7616251003