MODIFIED SUBGRADE 2025

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The document outlines the specifications for modifying subgrade to enhance stability in construction projects. It details the materials allowed, including hydrated lime and geosynthetics, and sets forth construction requirements such as application methods, compaction standards, and measurement criteria. Additionally, it describes payment terms for modified subgrade based on contract inclusion and contractor options.

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Click ‘Get Form’ to open the MODIFIED SUBGRADE document in the editor.
Begin by reviewing the 'Description' section (205.1) to understand the purpose of modifying subgrade and ensure you have the necessary approvals from the engineer.
In the 'Material' section (205.2), specify the type of modifying material you will use, such as hydrated lime or geogrid. Ensure that any required certifications are attached.
Proceed to 'Construction Requirements' (205.3). Here, indicate your application plan, including locations and amounts of modifying material, ensuring compliance with engineering directives.
Fill out the 'Method of Measurement' (205.4) by detailing how measurements will be taken for payment purposes, ensuring accuracy in square yard calculations.
Finally, complete the 'Basis of Payment' section (205.5) by noting whether payment is included in your contract or if it will be invoiced separately based on material costs.

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Got questions?

We have answers to the most popular questions from our customers. If you can't find an answer to your question, please contact us.

What is modified subbase?

Modified subbase shall consist of a uniform mixture of uniformly moistened granular materials, placed on a subgrade, shaped, and compacted in accordance with the contract documents.

What is an improved subgrade?

Improved Subgrade refers to the process of enhancing the engineering properties of the natural. soil beneath a pavement or structure to improve its strength, stability, and load-bearing capacity. This is typically done when the existing subgrade soil is too weak to support the intended loads.

What does subgrade mean?

Subgrade is defined as the natural soil and chosen particle size aggregate that is compacted to specific levels to support the weight of the courses above, serving as the foundation for road construction.

What are the types of subgrade soil?

Subgrade Physical Properties Material (USC given where appropriate)CBRElastic or Resilient Modulus (psi) Sandy Soils (SW, SP, SM, SC) 5 40 7,000 30,000 Silty Soils (ML, MH) 3 15 5,000 20,000 Clay Soils (CL, CH) 3 10 5,000 15,000 Organic Soils (OH, OL, PT) 1 5 Less than 5,0005 more rows

What is modified subgrade?

Modification refers to a short-term subgrade treatment that is intended to provide a stable working platform during construction. Stabilization refers to a subgrade treatment intended to provide structural stability for improved long-term performance.

What is the difference between soil blending and soil modification?

Soil stabilization involves mixing the stabilizing material into the soil, while soil modification involves adding the material to the soil surface or mixing it in with the soil.

MODIFIED SUBGRADE 2025

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