Understanding Soil Grain Size and Stabilization: Lime, Sand, Clay & Silt Explained

In this episode of Lime Time in Texas, Dale Rand from the Lime Association of Texas breaks down the fundamentals of soil stabilization by focusing on soil grain size and its impact on construction projects. Learn the difference between coarse grain soils (like sand and gravel) and fine grain soils (like silt and clay), how their characteristics affect strength and drainage, and which stabilization additives—like lime or Portland cement—are best suited for each soil type.

Whether you're an engineer, contractor, or industry professional, this detailed explanation will help you understand how to identify soil types and select the right stabilization method for your project.

Topics covered:
*Definitions and characteristics of coarse vs. fine grain soils
*Soil particle size classifications from boulders to clay
*Drainage and plasticity differences between sand, silt, and clay
*How lime uniquely stabilizes clay soils
*When to use Portland cement or select fill instead
*Understanding soil mixtures and loam
*Practical advice for soil stabilization choices

Visit our website for more resources and contact info: https://limetexas.org
Email Dale Rand: [email protected]

Chapters:
0:00 – Welcome & Introduction to Soil Stabilization
0:25 – Defining Coarse Grain Soils: Sand and Gravel Characteristics
1:55 – Defining Fine Grain Soils: Silt and Clay Properties
4:00 – Unique Features of Clay and Silt in Texas Soils
5:30 – Soil Particle Size Pyramid Explained
7:20 – Understanding Soil Sizes: Boulders to Clay
9:50 – The Soil Triangle: Clay, Sand, and Silt Interactions
11:00 – Characteristics of Clay Soils and Lime Stabilization
12:20 – Characteristics of Silt and Challenges in Construction
13:40 – Characteristics of Sand and Use of Portland Cement
15:00 – Summary: Choosing Stabilization Based on Soil Type
16:10 – Closing Remarks and Contact Information