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California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator

Easily calculate and compute california bearing ratio (cbr) & flexible road pavement thickness calculator with accurate equations, live formulas, and expert guidance.

Force recorded at 2.5 mm penetration (standard crushed stone load = 13.24 kN / 1370 psi).

Force recorded at 5.0 mm penetration (standard crushed stone load = 19.96 kN / 2000 psi).

Design heavy vehicle wheel load (standard legal axle is 80 kN / 40 kN per wheel).

Commercial truck tyre inflation pressure.

Calculated Result
6.4 %

Design CBR Value

Design CBR Value

6.4 %

California Bearing Ratio Percent

6.4

Cbr At2 Point5 Mm Percent

6.4

Cbr At5 Point0 Mm Percent

6.3

Recommended Pavement Thickness Cm

29.7

6.4 — %

Calculation Breakdown

  1. Applied FormulaComputes California Bearing Ratio (CBR) percentage from 2.5 mm and 5.0 mm penetration piston test data and determines the minimum required asphalt and aggregate base course flexible pavement thickness.\text{CBR} = \max\left(\frac{F_{2.5}}{F_{std,2.5}}, \frac{F_{5.0}}{F_{std,5.0}}\right) \times 100\%, \quad M_r = 10.3 \cdot \text{CBR} \text{ (MPa)}

CBR & Pavement Thickness Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.01.63.24.86.4Design CBR Value

What Is the California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator?

This tool computes california bearing ratio (cbr) & flexible road pavement thickness calculator with high precision arithmetic.

How Does the California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator Work?

Computes California Bearing Ratio (CBR) percentage from 2.5 mm and 5.0 mm penetration piston test data and determines the minimum required asphalt and aggregate base course flexible pavement thickness.

California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

CBR=max⁡(F2.5Fstd,2.5,F5.0Fstd,5.0)×100%,Mr=10.3⋅CBR (MPa)\text{CBR} = \max\left(\frac{F_{2.5}}{F_{std,2.5}}, \frac{F_{5.0}}{F_{std,5.0}}\right) \times 100\%, \quad M_r = 10.3 \cdot \text{CBR} \text{ (MPa)}

Computes California Bearing Ratio (CBR) percentage from 2.5 mm and 5.0 mm penetration piston test data and determines the minimum required asphalt and aggregate base course flexible pavement thickness.

How to Use the California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

California Bearing Ratio (CBR) & Flexible Road Pavement Thickness Calculator Example

Input Values:

penetrationLoadAt2Point5MmKn:0.85
penetrationLoadAt5Point0MmKn:1.25
designWheelLoadKn:40
tyrePressureKpa:550
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required %.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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