Cylinder Mold, Vibrating Table Apparatus, ASTM C1176

Cylinder Mold & Vibrating Table Apparatus (ASTM C1176)

The Cylinder Mold and Vibrating Table Apparatus is an essential piece of equipment for creating cylindrical test specimens from roller-compacted concrete (RCC), cement-treated aggregate, soil cement, and similar mixtures. This method, outlined in the ASTM C1176 standard, is employed when traditional consolidation techniques like rodding or internal vibration are not practical for these drier, stiffer concrete mixes.

The apparatus provides a standardized procedure to ensure that the test specimens accurately represent the material's properties as it would be placed in the field, leading to reliable and consistent results for quality control and assurance.

Key Features and Components:

Our apparatus is designed for durability and precision, ensuring it meets the stringent requirements of ASTM C1176. The main components include:

• Vibrating Table: The core of the unit, this sturdy table is engineered to produce a consistent and uniform vibration. It can be securely bolted to the floor or a substantial concrete base to ensure stability during operation.
• Swing Arm and Surcharge Weight: A 20 lb (9 kg) surcharge weight is attached to a swing arm. This innovative design allows the weight to be easily swung away while filling the mold and then precisely positioned on top of the specimen before vibration begins. This surcharge simulates the compaction from the roller and ensures even consolidation throughout the specimen's height.
• Cylinder Mold: The included 6” x 12” test mold conforms to ASTM C470 specifications. It features a locking mechanism that secures it firmly to the base of the vibrating table, preventing any movement during the compaction process.

The ASTM C1176 Testing Process:

The procedure for creating specimens with this apparatus involves several key steps:

1. Preparation: The mold is securely locked onto the vibrating table.
2. Filling: The freshly mixed concrete is placed into the mold in specific layers, as dictated by the standard.
3. Compaction: After each layer is added, the surcharge weight is positioned on the material, and the vibrating table is activated for a predetermined duration. This compacts the low-slump concrete mixture effectively.
4. Finishing: Once the final layer is compacted, the surface is struck off to create a smooth, level specimen.
5. Curing and Testing: The cylindrical specimen is then demolded and cured according to standard practices before undergoing testing for critical properties like compressive strength, density, and durability.

Applications and Importance:

This method is crucial for any project using roller-compacted concrete, such as:

• Pavements and roadways
• Dams and water resource structures
• Heavy-duty industrial flooring

By simulating the compaction process used in construction, the vibrating table ensures that the resulting test specimens provide an accurate assessment of the concrete's potential performance. This allows engineers to verify that the mix design meets project specifications and will deliver the required strength and durability.

Aggregate Considerations:

Per ASTM C1176, it is important to consider the nominal maximum size of the aggregate. If the aggregate is larger than 50 mm (2 inches), it must be scalped (removed) by passing the mixture over a designated sieve before creating the test specimen. This ensures the results are not skewed by oversized particles that are not representative of the overall mix in the context of the 6-inch diameter mold.

Your Source for Concrete Testing Equipment

For reliable and accurate concrete vibration testing, trust Certified MTP. Our Cylinder Mold and Vibrating Table Apparatus is built to last and fully conforms to ASTM C1176, providing you with the equipment you need to ensure the quality and integrity of your construction materials.

Included with Purchase:

• Vibrating Table
• Swing Arm with Guide Sleeve
• 20 lb Surcharge Weight
• 6" x 12" Cylinder Test Mold