User’s Guide: Estimation of Key PCC, Base, Subbase, and Pavement Engineering Properties From Routine Tests and Physical Characteristics

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CHAPTER 5. Stabilized Materials Models

As the LTPP database contains limited data on modulus values and index properties of stabilized materials, the only prediction model that can be developed for modulus prediction is that for LCB materials, which is included in this section.

LCB Elastic Modulus Model

The model developed can be expressed as follows:

Figure 97. Equation. Prediction model 17 for E_LCB.

Where:

E_LCB = Elastic modulus of the LCB layer. f'_{c, 28d} = 28-day compressive strength of the LCB material.

The predicted versus measured and the residual errors plots for this relationship are presented in figure 98 and figure 99, respectively. The model has an R² value of 41.24 percent, an RMSE of 541,600 psi, and uses 11 data points. The compressive strength values range from 770 to 2,800 psi with an average value of 1,400 psi.

Figure 98. Graph. Predicted versus measured for the LCB elastic modulus model.

Figure 99. Graph. Residual errors for the LCB elastic modulus model.