# Software Development (PAKPAVE) for Flexible Pavement Design

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4 AASHTO Design Method Fig. 6: Thickenss determination of various layers Fig. 4: Dropdown list showing different parameters of AASHTO Design Now let s say we have to determine the structural number and ESAL, so we go to the required interface by clicking its name, put the inputs required, click on the calculate button and get the required result. Similarly for given loading, environmental and soil conditions, the pavement design life can also be estimated as shown below. Fig. 7: Calculating the Design Life of pavement Fig. 4: W18 and SN The ESAL can also be calculated from the traffic data based on the number of vehicles, truck factor, and growth factor. Group Index Method of Design To use the group index method of design click on its name at the main window this will take you to the concerned interface. Flexible pavement based on the traffic volume, and soil characteristics in terms of group index values can be designed here as follows: Fig. 5: Calculating design ESAL from traffic data The thickness of the pavement can be designed by putting in the data from the field survey and the soil tests conducted. Fig. 8: Determination of Layer Thicknesses by Group Index Method [ISSN: ] 4

5 CBR Method of Design By clicking at the CBR design method takes you to the required window where by putting in the values of CBR, tyre pressure, area of contact etc you can get the desired design of the flexible pavement. APPENDIX Sample Code for AASHTO Design Dim a1, a2, a3, m2, m3, sn1, sn2, sn3, t1, t2, t3 As Double a1 = Val(TextBox7.Text) a2 = Val(TextBox8.Text) a3 = Val(TextBox9.Text) m2 = Val(TextBox10.Text) m3 = Val(TextBox11.Text) sn1 = Val(TextBox12.Text) 'where m1=1 so no need of mentioning it, and t1,t2,t3 stands for the layers thicknesses of d1,d2,d3 Fig. 9: Layer Thickness by CBR Method VII. CONCLUSIONS AND RECOMMENDATIONS A. Conclusions The research carried out to develop the software successfully accomplished and the results it gives are as accurate as expected. The developed software can be used to design the flexible pavement by AASHTO, Group Index, and CBR methods. The design results obtained from each method could be compared and hence select the best design. The results obtained by each of the method using this software were compared with results obtained from the manual design and with that of DARWin: AASHTO S design software and were found absolutely accurate. The development of software for the pavement design is very important as it makes the design process very easy and accurate and saves a lot of precious time. Hence the design process can be done in very short time and accurately avoiding the computational and calculation errors of the conventional manual design method. B. Recommendations This software is limited to the flexible pavement design based on the AASHTO, Group index, and CBR methods so it can further be extended for Asphalt institute design method and Road Note 31 as well as for the rigid pavement design. The use of this software also needs a good understanding of the manual design methods, hence to use this software for education, research, and designing in field; one has to be fully aware of the manual design methods. sn2 = Val(TextBox13.Text) sn3 = Val(TextBox14.Text) t1 = sn1 / a1 TextBox15.Text = t1 t2 = (sn2 - a1 * t1) / (a2 * m2) TextBox16.Text = t2 t3 = (sn3 - a1 * t1 - a2 * t2 * m2) / (a3 * m3) TextBox17.Text = t3 REFERENCES [1] Yang H. Huang, Pavement Analysis and Design, Second Edition. [2] Series no. 1 (MS-1) by Asphalt Institute, Asphalt pavements for High Ways and Streets Manual. [3] Tom V. Mathew and K V Krishna Rao, Introduction to Transportation Engineering. [4] Dr.S.K KHANNA and Dr.C.E.G JUSTO, High Way Engineering. [5] Evangelos Petroustsos, Mastering Visual Basic.Net. [6] Bryon S. Gottfried, Theory and Problems of Programming with Visual Basic. [7] AASHTO, 1972 (Revised 1993), Interim Guide for Design of Pavement Structures. [8] Mass High way Pavement design 2006 edition. [9] AASHTOWare DARWin Pavement Design, Analysis and rehabilitation software. [ISSN: ] 5

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