How Mintek’s Soils Lab Supports Smarter Geotechnical Decisions

Every successful construction project starts with understanding the ground beneath it. Whether it is a roadway, industrial development, commercial site, or large-scale soil stabilization project, existing soil conditions can significantly affect cost, schedule, constructability, and long-term performance.

That’s why engineers, contractors, and project owners turn to Mintek’s Innovation Center.

The Innovation Center serves as Mintek’s dedicated soils laboratory and technical resource for customers addressing challenging site conditions, geotechnical testing needs, and soil improvement opportunities.

For many customers, the question is not simply, “Will lime work?” It is whether existing soils can be improved and reused rather than removed and replaced. Can the material already on-site support the project requirements? How much improvement can realistically be achieved through lime treatment? The Innovation Center helps customers explore these questions through laboratory testing, technical expertise, and practical field experience.

The Innovation Center provides geotechnical testing to characterize soil properties, evaluate treatment responses, and generate data to support engineering and project decisions.

Laboratory Soil Evaluation

• Atterberg Limits and Plasticity Index (PI) evaluation
• Moisture content testing
• Shrink-swell testing
• Lime-treatment evaluations at multiple application rates
• Eades-Grim pH testing
• Unconfined Compressive Strength (UCS) testing
• California Bearing Ratio (CBR) testing

Soil samples may be evaluated at multiple lime treatment rates – often referred to as a lime series – to measure treatment response and identify candidate rates for additional performance testing.

Field Evaluation Methods

• Dynamic Cone Penetrometer (DCP) testing
• Plate load testing
• Falling Weight Deflectometer (FWD) evaluations

When appropriate, field evaluations can complement laboratory testing by helping project teams relate laboratory findings to actual in-place soil conditions and performance. Together, laboratory and field testing can provide a more complete understanding of soil behavior and help inform project decisions.

Atterberg Limits testing identifies key moisture-related consistency limits of fine-grained soils, while the Plasticity Index indicates the range over which the soil behaves plastically. Together, these results help identify highly plastic or moisture-sensitive soils that may be difficult to handle and compact. Shrink-swell testing helps identify materials that may expand or contract as moisture conditions change.

Strength testing, including UCS and CBR, provides data for evaluating whether treated materials can satisfy project-specific engineering requirements. Lime series testing provides comparative data on how a soil responds across multiple treatment levels. Eades-Grim pH testing can help estimate the initial lime demand needed to create the high-pH environment associated with lime-soil reactions. It is generally used as a starting point and should be considered alongside strength, plasticity, and other project-specific performance requirements.

Together, these tests help determine whether existing soils may be suitable for modification, stabilization, and reuse while providing technical findings to support treatment planning and construction decisions.

Helping Customers Reduce Construction Risk

One of the greatest benefits of working with the Innovation Center is reducing uncertainty early in the project lifecycle.

Challenging soils can create significant risks. If unsuitable materials are discovered late in construction, projects may face schedule delays, additional excavation, imported fill costs, increased trucking, redesign discussions, and change orders.

Testing helps identify opportunities and potential challenges before those issues become costly field problems.

Testing results are often used to:

• Evaluate whether existing on-site soils can be improved and reused
• Compare treatment options before finalizing a construction approach
• Reduce project risk and potential change orders
• Support discussions between contractors, engineers, owners, and DOTs
• Move from assumptions to data-driven decisions

A common example involves highly plastic clay soils that are initially considered unsuitable for construction. Through laboratory evaluation, the Innovation Center can measure how a particular soil responds to lime treatment, including potential changes in plasticity, workability, and strength. In some cases, that information can support the use of material already on site rather than excavating and replacing it with imported fill.

From Soil Sample to Solution

For qualified projects, Mintek provides laboratory testing and technical evaluation to help customers better understand their soils and assess potential treatment options. Customers begin by working with Mintek’s Technical Market Development team, which brings together engineering, geological, soil stabilization, and construction-industry knowledge. The team works directly with customers to understand the project, site conditions, technical requirements, goals, schedule, and construction challenges. Soil samples are then collected and submitted to the Innovation Center, where the laboratory and technical teams use this project context to develop an appropriate testing program.

Customers are typically asked to provide approximately five full 5-gallon buckets of representative soil from across the project site, although the amount may vary depending on the proposed testing program. This generally provides enough material for the laboratory to prepare test specimens, test the soil at multiple treatment levels, and assess treatment response and potential engineering performance under the laboratory conditions tested.

Laboratory results provide technical information to support project evaluation and treatment planning, but actual field performance also depends on factors such as soil variability, moisture conditions, mixing, lime application rate, compaction, curing, weather, and construction practices. Final treatment design, application rates, and acceptance criteria should be established in accordance with project specifications and reviewed by the appropriate project professionals.

A typical project flow looks like this:

• Initial discussion and project review
• Soil sample collection and submission
• Laboratory testing and evaluation
• Interpretation of results
• Treatment guidance and project-specific technical support

Once the samples are received, the laboratory prepares the soil, develops test specimens, performs the appropriate testing, and documents the technical findings. The results are then interpreted in the context of the customer’s objectives and project requirements. Customers typically work with a single point of contact who helps coordinate testing, communication, treatment guidance, and project-specific technical support throughout the evaluation process.

The Innovation Center is positioned to act as an extension of the customer’s technical resources, providing support throughout the evaluation process.

More Than a Soils Lab

Many laboratories can generate test reports. What sets the Innovation Center apart is the combination of specialized lime expertise, geotechnical testing capabilities, and practical field experience. The team understands that laboratory data must ultimately be applied in real-world construction conditions.

As part of the broader Carmeuse technical network, the Innovation Center combines geotechnical expertise with capabilities in chemistry, microscopy, pilot-scale testing, and product development, allowing customers to benefit from a wide range of technical resources.

The center also serves as a resource for contractors, engineers, DOTs, and industry partners seeking guidance related to soil-lime interactions, stabilization strategies, material performance, and field application.

Supporting Projects Across the Region

The Innovation Center has supported projects ranging from local developments to major infrastructure and stabilization efforts. One example is a large-scale stabilization project in eastern Tennessee, where laboratory testing and technical evaluation provided project-specific information to support lime treatment planning for challenging soils across the site. The project demonstrates how understanding soil conditions and treatment responses early can help project teams move into construction with better information and a clearer treatment approach.

While every project is different, the need for reliable geotechnical data remains the same.

Whether the challenge involves high plasticity, poor strength, moisture-sensitive soils, shrink-swell concerns, or questions about engineered fill, the Innovation Center helps customers understand the material and identify potential solutions.

A Partner in Project Success

More than a soils lab, the Innovation Center combines geotechnical testing, specialized lime expertise, and practical construction experience to help customers understand their materials, evaluate potential treatment approaches, and make better-informed project decisions.

Have a project involving wet, highly plastic, low-strength, or otherwise challenging soils? Contact Mintek to discuss the site conditions and determine whether laboratory evaluation may help identify a practical path forward.