Which machine is used for compressive test of concrete?

The machine typically used for conducting compressive tests on concrete specimens is called a Compression Testing Machine or a Concrete Compression Testing Machine. This machine is specifically designed to apply compressive forces to concrete samples and measure their strength and behavior under compression.

A Compression Testing Machine consists of the following components:

1. Load Frame: The load frame is the main structure of the machine that provides support and stability during testing. It consists of a robust frame, columns, and a crosshead that moves vertically to apply the compressive load.

2. Hydraulic or Mechanical Actuator: The actuator is responsible for applying the compressive force to the concrete specimen. It can be either hydraulic or mechanical, depending on the design of the machine. Hydraulic actuators are commonly used as they provide precise control and smooth loading rates.

3. Load Cell: A load cell is integrated into the machine to measure and record the applied load. It converts the force into an electrical signal, which is then displayed on the machine's control panel or recorded by a data acquisition system.

4. Platens: The machine is equipped with two hardened steel platens, one fixed and one movable, which are used to support and distribute the load evenly on the specimen. The platens have smooth surfaces to ensure proper contact with the specimen.

5. Control Panel: The control panel contains the necessary controls and display interfaces for operating the machine. It allows the operator to set the load rate, monitor the applied load, and control the testing process.

During a compressive test on a concrete specimen, the sample is placed between the platens of the compression testing machine. The machine applies a steadily increasing compressive force until the specimen fails or reaches a specified deformation or load limit. The load and deformation data are continuously recorded during the test.

It is worth noting that different testing standards and specifications, such as ASTM C39 or EN 12390, provide specific guidelines for the compressive testing of concrete. These standards outline the sample preparation, testing procedures, and criteria for determining compressive strength and other properties of concrete. Adhering to the relevant standards ensures consistent and accurate testing results.

Concrete Compression Testing Machine HZ-009.pdf