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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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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