For existing pavements originally designed using the California Bearing Ratio (CBR) method, the subgrade modulus can be determined from direct soil testing or using the available CBR values and converting them to an equivalent Modulus of Elasticity using the relationship that appears here.

The ternary diagram is a three-dimensional graphical representation that illustrates the relative distribution of three components in a mixture. In the context of soil classification, these components are clay, silt, and sand. The use of ternary diagrams in geology and soils has evolved over time to visualize proportions and relationships among these three fundamental elements.

This web application allows you to calculate the centroid, moment of inertia, and products of inertia of a parabolic shape on the input of its base and height.

Through the following tool, you can obtain the grain size distribution curve of a soil sample by entering the percentage of material passing through each sieve.

Jackson and Moreland charts are fundamental tools in structural design, specifically in determining critical values for the effective length factor k in axially compressed members. These charts, based on a series of structural assumptions, have been developed to simplify the calculation process, offering a visual representation of relationships between different parameters.