What is Low-Strength Material (CLMS) and its typical compressive strength range?

What is Low-Strength Material (CLMS) and its typical compressive strength range?

• A. 50 to 1200 psi
• B. 5 to 600 psi
• C. 500 to 2000 psi
• D. 10 to 100 psi

Answer: (A)

Low-Strength Material (CLMS) is a cementitious mix used under slabs for non-structural purposes, designed to be much weaker than normal concrete so it doesn’t carry structural loads. The typical compressive strength range is about 50 psi up to 1200 psi, with 1200 psi serving as the upper threshold for what is still considered low-strength; beyond that, the material is treated as standard concrete. This range allows CLMS to be workable and easy to place while providing a stable bed and surface for non-structural applications. The other ranges either imply unrealistically low values or exceed the low-strength limit, so they don’t fit how CLMS is defined.

Low-Strength Material (CLMS) is a cementitious mix used under slabs for non-structural purposes, designed to be much weaker than normal concrete so it doesn’t carry structural loads. The typical compressive strength range is about 50 psi up to 1200 psi, with 1200 psi serving as the upper threshold for what is still considered low-strength; beyond that, the material is treated as standard concrete. This range allows CLMS to be workable and easy to place while providing a stable bed and surface for non-structural applications. The other ranges either imply unrealistically low values or exceed the low-strength limit, so they don’t fit how CLMS is defined.