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Determine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability = 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic=5.0x10° HVAG(8) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAGI Subbase type 125 mm bound Up to 10 Up to 5x10 Up to 1 x 10 Greater than 1x 10/ 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative Maximum permitted value 75 CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30. 25. 20 15 12 10 Pavement type PCP Dowelled & CRCP 260 250 240 230 8 7. 6. 220 210 Concrete Base 200 Thickness 190 (mm) 180 170 10 12 15 Design subgrade strength CBR % Table 9.2: Load safety factors (La) for rigid pavement types 160 150 140 150mm LCS 125mm LCS 10⁰ 80% 1.15 1.05 150 mm bound or 125 mm LCS 170 mm bound or 125 mm LCS 150 mm LCS 125mm bound If CBR <2, use 150 mm LCS subbase and adopt an effective subgrade strength of CBR 5% Figure 9.2: Example design chart for plain concrete pavements without dowelled joints for combinations of two effective subgrade strengths and two load safety factors nm LCS or 2150mm bound Note: as described in Section 9.4.1, the specified base thickness may exceed the design base thickness obtained from this chart Minimum Base Thickness 85% 1.15 1.05 Project design reliability 90% 1.20 1.10 107 Heavy Vehicle Axle Groups 95% 1.30 1.20 Effective CBR 35%, LSF 1.15 -Effective CBR 35%, LSF 1.3 97.5% 1.35 1.25 Effective CBR 75%, LSF 1.15 Effective CBR 75%, LSF 1.3

Determine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability = 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic=5.0x10° HVAG(8) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAGI Subbase type 125 mm bound Up to 10 Up to 5x10 Up to 1 x 10 Greater than 1x 10/ 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative Maximum permitted value 75 CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30. 25. 20 15 12 10 Pavement type PCP Dowelled & CRCP 260 250 240 230 8 7. 6. 220 210 Concrete Base 200 Thickness 190 (mm) 180 170 10 12 15 Design subgrade strength CBR % Table 9.2: Load safety factors (La) for rigid pavement types 160 150 140 150mm LCS 125mm LCS 10⁰ 80% 1.15 1.05 150 mm bound or 125 mm LCS 170 mm bound or 125 mm LCS 150 mm LCS 125mm bound If CBR <2, use 150 mm LCS subbase and adopt an effective subgrade strength of CBR 5% Figure 9.2: Example design chart for plain concrete pavements without dowelled joints for combinations of two effective subgrade strengths and two load safety factors nm LCS or 2150mm bound Note: as described in Section 9.4.1, the specified base thickness may exceed the design base thickness obtained from this chart Minimum Base Thickness 85% 1.15 1.05 Project design reliability 90% 1.20 1.10 107 Heavy Vehicle Axle Groups 95% 1.30 1.20 Effective CBR 35%, LSF 1.15 -Effective CBR 35%, LSF 1.3 97.5% 1.35 1.25 Effective CBR 75%, LSF 1.15 Effective CBR 75%, LSF 1.3

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter21: Pavement Management
Section: Chapter Questions
Problem 12P
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Determine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability - 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic 5.0*10* HVAG(B) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAG) Subbase type 125 mm bound Up to 10⁰ Up to 5x10 150 mm bound or 125 mm LCS Up to 1x10 170 mm bound or 125 mm LCS 150 mm LCS Greater than 1x 10 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative 75 Maximum permitted value CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30 25 20 15 12 10 Concrete Base 200 Thickness 190 (mm) 180 8. Pavement type 7. 6. 5. PCP Dowelled & CRCP 260 250 240 230 220 210 170 160 150 140 150mm LCS 125mm LCS 8 10 Design subgrade strength CBR % Table 9.2: Load safety factors (Ls) for rigid pavement types 100mm LCS or 2150mm bound 125mm bound 80% 1.15 1.05 If CBR <2, use 150 mm LCS subbase and adopt an effective subgrade strength of CBR 5% Note: as described in Section 9.4.1, the specified base thickness may exceed the design base thickness obtained from this chart Minimum Base Thickness Project design reliability 90% 85% 1.15 1.06 Figure 9.2: Example design chart for plain concrete pavements without dowelled joints for combinations of two effective subgrade strengths and two load safety factors 12 15 1.20 1.10 107 Heavy Vehicle Axle Groups Effective CBR 35%, LSF 1.15 Effective CBR 35%, LSF 1.3 95% 1.30 1.20 97.5% 1.35 1.25 Effective CBR 75%, LSF 1.15 -Effective CBR 75%, LSF 1.3 10⁰
Transcribed Image Text:Determine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability - 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic 5.0*10* HVAG(B) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAG) Subbase type 125 mm bound Up to 10⁰ Up to 5x10 150 mm bound or 125 mm LCS Up to 1x10 170 mm bound or 125 mm LCS 150 mm LCS Greater than 1x 10 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative 75 Maximum permitted value CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30 25 20 15 12 10 Concrete Base 200 Thickness 190 (mm) 180 8. Pavement type 7. 6. 5. PCP Dowelled & CRCP 260 250 240 230 220 210 170 160 150 140 150mm LCS 125mm LCS 8 10 Design subgrade strength CBR % Table 9.2: Load safety factors (Ls) for rigid pavement types 100mm LCS or 2150mm bound 125mm bound 80% 1.15 1.05 If CBR <2, use 150 mm LCS subbase and adopt an effective subgrade strength of CBR 5% Note: as described in Section 9.4.1, the specified base thickness may exceed the design base thickness obtained from this chart Minimum Base Thickness Project design reliability 90% 85% 1.15 1.06 Figure 9.2: Example design chart for plain concrete pavements without dowelled joints for combinations of two effective subgrade strengths and two load safety factors 12 15 1.20 1.10 107 Heavy Vehicle Axle Groups Effective CBR 35%, LSF 1.15 Effective CBR 35%, LSF 1.3 95% 1.30 1.20 97.5% 1.35 1.25 Effective CBR 75%, LSF 1.15 -Effective CBR 75%, LSF 1.3 10⁰
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