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Compression Testing Machine (CTM) &#; An Overview

A compression Testing Machine (CTM) is used to measure the compressive strength of a material. The CTM is designed to apply a compressive load to the sample until it fails. The machine consists of a piston that moves up and down inside a cylinder, applying the load to the sample.

The CTM machine is used in construction industries to test the quality of concrete. The compressive strength of concrete is determined by testing concrete cubes or cylinders using the CTM machine. The CTM machine can also be used to test the compressive strength of other materials such as bricks, rocks, and metals.

The CTM machine is available in different sizes, capacities, and types. The most common types of CTM machines are manually operated and digital machines. The manually operated CTM machine requires a skilled operator to control the load application, while the digital CTM machine is fully automatic and can be operated by anyone with minimal training.

The CTM machine consists of a load frame, a hydraulic system, and a data acquisition system. The load frame is the main body of the machine, and it supports the hydraulic system and the data acquisition system. The hydraulic system is used to apply the load to the sample, and the data acquisition system is used to measure and record the load and deformation data.

To perform a compression test using the CTM machine, the sample is prepared by casting it into a cube or cylinder mold. The sample is then cured for a specific period of time and tested by placing it in the CTM machine. The load is applied to the sample at a specific rate until it fails. The load and deformation data are recorded during the test, and the compressive strength of the sample is calculated using the recorded data.

In conclusion, the CTM machine is an essential tool in the construction industry to test the quality of concrete and other materials. The CTM machine can be operated manually or digitally and is available in different sizes and capacities. Proper usage of the CTM machine ensures accurate and reliable test results.

What is a Compression Testing Machine?

• One of the most fundamental types of machine for material testing with their properties like tensile strength, elastic limits, and more.
• Compression Tests are used to determine material behaviors under compressive pressure loads.
• During the test, we measure different properties of materials such as elastic limits, proportional limit, yield point, yield strength, and more.

Why Perform A Compression Test?

Testing allows manufacturers to make sure about the integrity, and safety of materials, components, and manufacturing process.

Applications can vary from the strength of Glass to endurance testing of concrete beams used in construction.

Low Tensile Strength of Materials = High Compressive Strength &#; And Vice-versa&#;.

Compression testing is often used on brittle materials such as concrete, metals, plastics, ceramics, composites, and corrugated materials like cardboard. 

Series of Compression Testing Machines

These machines are available in 50kN, 100kN, 500kN, kN, kN, kN & kN Capacities.

Compression Testing Machines Classification:

• Digital models with pace rate indicators.
• MicroController based models with automatic pace rate controllers.
• Fully Automatic models.
• Servo models.
• Analog models.
• Touch Screen Models (Digital, Micro-Controller & Automatic)

Aimil Prime Automatic Compression Testing Machine (Fully Automatic)

https://www.aimil.com/products/aimil-prime-automatic-compression-testing-machine

Aimil Prime MU Compression Testing Machine (Micro Controller Based)

Aimil_Prime_MU_Compression_Testing_Machine

https://www.aimil.com/products/aimil-prime-mu-compression-testing-machine&#;micro-controller-based-

Servo Compression Testing Machine

https://www.aimil.com/products/servo-compression-testing-machine

New CTM Launched

If you want to learn more, please visit our website concrete compressor machine.

Automatic Compression Testing Machine with Aimil Software [ACTM]

The Aimil Series of Compression Testing Machines represents the pinnacle in their category, boasting robust construction and user-friendly simplicity. These machines require minimal training for personnel to operate efficiently and reliably. The Aimil ACTM stands as a fully automated iteration of the manual/semiautomatic Compression Testing Machine, spanning a range from 50kN to kN. Operable both as a standalone unit with EDI and compatible with Aimil software on a desktop or laptop, the software exclusively manages machine operations. EDI oversees machine control, issuing specific commands as needed. Load resolution ranges from 0.002kN to 0.2kN, varying with machine capacity. Available models include: AIM 302E-FA-2EM, AIM 305E-FA-2, AIM 308E-FA-2, AIM 311E-FA-2, AIM 314E-FA-2, AIM 317E-FA-2, AIM 320E-FA-2, & AIM 320E-FA--2 with capacities from 50kN to kN.

Fully Automatic Compression Testing Machine Servo Motor Controlled [FACTM]

An intelligent pace rate controller governs the operations of a servo motor controller-based compression testing machine, enabling various functionalities such as Automatic Pace Rate Control, Data Logging, Data Printing, and Load Hold. This controller manages tasks such as activating and deactivating the pump automatically, regulating the designated pace rate, and initiating machine shutdown based on predetermined conditions. At the end of each run, pressure release occurs, and the machine resets at the start of every test. The pace rate is upheld through comprehensive three-term PID feedback control using high-torque servo motors and driver sets. Complete automation encompasses data acquisition, storage, management, and analysis. Additionally, a silent hydraulic pump contributes to a more conducive work environment. Available models include: Fully Automatic Compression Testing Machine with Servo Motor Control, Cap. kN, and Fully Automatic Compression Testing Machine with Servo Motor Control, Cap. 500kN.

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How is Our CTM machine divided into various variants?

Also, Read:

Technical Overview of Compression Machines and How to Locate Post Tensioing with GPR Systems

With the start of we are pleased to introduce the first new product from our suppliers. 

Our articles this month are a technical overview of compression machines and force measurement and a case study on locating post tensioning with GPR systems.

Compression Testing Machinery Technical Overview

Compression Machines are used to determine compressive, splitting and flexural strengths. Most commonly applied to materials of high compression but low tensile strength, in which the specimen is subjected to increasing compressive forces until failure occurs. The compressive strength of the specimen is calculated by dividing the maximum load attained during the test by the cross-sectional area of the specimen. This article will discuss the compression testing and the compression machine.

Compression Machine Selection

Compression machines have to be selected depending on the maximum expected specimen strength, shape and dimensions. Those requirements determine the capacity of the frame, the type of spherical seat and the platen dimension. In Australia, cylinder specimens shall be accepted for testing if they are moulded in accordance with AS .8.1 and are free from defects likely to affect their strength.

The machine shall meet requirements for Grade A machines defined in AS for the relevant range of compressive forces. A compression machine needs to be power operated and capable of applying a constant rate of loading. A load pacer is required which can operate at a rate of loading specified in AS Clause 8. The steel platens and flatness of the surface of each platen must comply with AS .9

Compression machine can be used for early age Unconfined compression strength test; Unconfined flexural and splitting tests by using proper accessories; Mortar (Cement) compression tests by using proper accessories or Unconfined core testing

PCTE offers various models of concrete compression machine at different level to suit market needs: Manual, Semi-Automatic and Fully-Automatic Compression Testing Machine with different capacities.

The structure of a Compression Machine

The main parts of compression machine are the Frame, Hydraulic Power Pack and Data acquisition and control unit.

Load Frame Assembly

A typical load frame consists of the followings:
Load frame, Compression platens, Upper platen with ball seating, lower platen, Loading Cylinder Assembly, Distance pieces, Limit Switch and Front and rear protective doors.

Hydraulic Power Pack

Hydraulic power pack supplies required oil to the load frames for loading.

• Oil Tank
• Oil Filter
• Motor
• Hydraulic Pump
• Delivery Valve
• Working Cylinder
• Pressure Sensor
• Return Valve

Data Acquisition and Control System

Data Acquisition and Controls Systems are to operate the machines mechanical systems and process data from load cells or pressure transducers (installed on the compression machine frame and additional frames).

Data is able to be collected from the data acquisition system and transferred to data management software via serial port or network cable. Data such as peak load, load rating, etc. can be recorded and transferred.

Compression Machine Operation

Correct operation of a compression machine leads to reliable data. It is important to perform the testing as promptly as possible after removal of the test specimen from the curing environment. Specimen should be tested in a wet condition unless otherwise specified. Dimensions should be determined in accordance with AS .9 with surplus water wiped off specimens.

The platens of the testing machine and the bearing surfaces of specimens should be cleaned which include films of oil, free loose particles or all traces of lubricant.

Placing the specimen on the bearing block with top and button surface and in horizontal position. Carefully align the axis of the specimen with the centre of thrust of the spherically seated platen. The hydraulically activated platen needs to be floating before bringing the upper platen and the capped specimen together (when the uniform bearing is obtained).

Apply the force without shock and increase continuously at a rate equivalent to 20±2 MPa compressive stress per minute until no increase in force can be sustained. Stop once the specimen fails (often observed as crack and splintering and record the maximum force applied to the specimen as indicated by the testing machine.

If an abnormal test result is obtained, fully break the specimen to facilitate further examination.

Calculation

The compressive strength of the specimen can be worked out by dividing the maximum load applied to the specimen during the test by the average cross-sectional area and express the result to the nearest 0.1 MPa. The cross-sectional area should be calculated from the average of the two measured diameters of a cylinder samples or side dimensions of cube samples. Data recording and reporting procedure need to be in accordance with AS .9.

Applicable Standards

AS and AS
EN -3/-4
BS
ASTM C39

Conquest and Post Tensioning Scanning

Post-Tensioning (PT) is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands. The benefits post-tensioning brings to a structure include large open plan, column free floor spaces.

One of the main applications of the GPR is to locate PT. Its antenna has the right frequency to develop a crisp image and at the same time get the necessary depth, this combination is a critical factor when locating PT.

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