Custom Concrete Compression Testing Machine Manufacturers

Which type of concrete specimens are suitable for concrete compression testing machines

In the construction of modern construction projects, bridges and tunnels, road construction, and municipal infrastructure, concrete is a core structural material, and its strength is directly related to the safety and stability of the overall structure. In order to ensure the durability and bearing capacity of concrete structures during use, concrete compressive strength testing, as an important part of engineering quality control, becomes particularly critical.
Concrete Compression Testing Machine (CCTM) is the core equipment used to evaluate the compressive strength performance of concrete. It can perform force tests on concrete specimens of different shapes and specifications, thereby obtaining reliable data on compressive strength. As a professional manufacturer in the field of mechanical performance testing equipment in China, Zhejiang Yiyu Instrument Equipment Co., Ltd. has provided thousands of laboratories and engineering units with excellent performance concrete compression testing machine solutions with its deep accumulation in structural design, manufacturing process, and product stability.
Concrete specimen types suitable for concrete compression testing machines
Concrete compression testing machines are mainly suitable for the following types of concrete specimens:
1. Standard cubic specimens
The most common type of concrete specimen is a 150×150×150 mm cube (there are also 100 mm side lengths for specific projects), which is widely used in domestic and foreign engineering testing standards, such as GB/T 50081, EN 12390, etc. After the curing period (usually 28 days), such specimens are loaded and crushed by the compression testing machine to calculate the compressive strength value.
The testing machine provided by Yiyu Instruments has a precise force control system and a large-size pressure plate design, which fully adapts to the uniform force requirements of cubic specimens, and the test process is more stable and the data repeatability is stronger.
2. Cylindrical specimens
Cylindrical concrete specimens are common in countries and regions that adopt ASTM standards, such as the United States. The common size is 150 mm diameter × 300 mm height (or 100 × 200 mm), which is suitable for structural concrete performance evaluation.
In view of the stress characteristics of this type of specimen, Yiyu concrete compression testing machine adopts high rigidity structure and automatic centering platen to ensure that the loading axis is consistent with the specimen axis, avoid test errors caused by eccentric loading, and fully meet the accuracy requirements of ASTM C39 standard.
3. Concrete solid bricks, hollow bricks and blocks
With the promotion of prefabricated buildings and green building materials, non-standard concrete products such as hollow blocks and aerated concrete bricks are gradually increasing. Blocks of different shapes put forward higher requirements for platen area, fixture adaptability, and loading control.
Yiyu instruments are equipped with a variety of replaceable loading modules in product design to support compressive strength tests of bricks of multiple specifications. At the same time, it has a specimen positioning auxiliary device to prevent specimen slippage, which improves the safety and accuracy of the test.
4. High-strength concrete and fiber-reinforced concrete
In modern super-high-rise buildings, bridges and other projects, high-strength concrete (such as C60 and above) and concrete with composite reinforcement materials such as steel fiber and polypropylene fiber are increasingly widely used. This type of material has greater brittleness and sudden failure characteristics during compression.
In order to cope with the special mechanical behavior of such specimens, the high-load compression testing machine developed by Yiyu Instruments has a maximum loading capacity of 1000kN, 2000kN and even 3000kN, and has overload protection and displacement-force joint control functions to ensure the safety and reliability of the test process.
Technical advantages and service guarantees-the comprehensive strength of Yiyu Instruments
Zhejiang Yiyu Instrument Equipment Co., Ltd. is located in Shangyu District, Shaoxing City, Zhejiang Province. It is a national high-tech enterprise integrating R&D, manufacturing, sales and services, focusing on mechanical properties testing equipment for metals, non-metals and composite materials. Relying on its superior geographical location and efficient logistics system, the company has established a customer service network covering the whole country and has maintained long-term cooperative relations with many scientific research institutions and testing units.
Yiyu concrete compression tester products have the following features:
High-precision sensing system: imported load cells and closed-loop control technology are used to ensure that the force value accuracy reaches ±1%;
Intelligent control system: touch screen operation + PC joint control function, which can record, analyze and export test data in real time;
Diversified fixture and specimen adaptability: It can be applied to concrete specimens of various sizes, shapes and strength grades;
Quality and standard guarantee: The product has passed ISO quality system certification, has a number of utility models and invention patents, and is manufactured in strict accordance with national transportation standards.

What is the indication error and repeatability error of the concrete compression tester?

Indication error: the core parameter for judging the measurement accuracy of the instrument
What is the indication error?
Indication error refers to the deviation between the value displayed by the equipment during the measurement process and the actual load. Simply put, it is the error between the pressure displayed by the equipment and the actual pressure applied. It reflects the overall accuracy of the test machine's force measurement system and is an important basis for weighing whether a compression tester is qualified.
National standards
According to China's national standards GB/T 16826-2008 (Inspection of static uniaxial testing machines) and JJG 139-2014 (Testing machine verification procedures), the indication error of concrete compression testing machines should generally meet the following requirements:
Within ±1.0% is the first-level accuracy;
Within ±0.5% is the high-precision level better than the first level;
A very small number of high-end models can reach an indication accuracy of ±0.3% or even ±0.2%.
Technical performance of Yiyu instruments
Yiyu concrete compression testing machines use imported high-sensitivity pressure sensors and digital signal processing systems. All equipment is shipped according to the first-level accuracy or even higher than the first-level accuracy standard:
The indication error of standard models is controlled within ±1%;
High-end models can stably achieve an accuracy level of ±0.5%;
All products have passed third-party metrology certification and meet ISO 7500-1 international standards.
Through the self-developed closed-loop control system, Yiyu Instrument Equipment can achieve continuous correction during dynamic loading, effectively reduce the influence of error sources such as temperature drift and mechanical friction, and make each set of test data more authoritative.
Repeatability error: a key indicator for evaluating equipment stability
What is repeatability error?
Repeatability error refers to the fluctuation range between the results obtained when the same test is performed multiple times under the same test conditions. It reflects the ability of the testing machine to maintain consistency in multiple tests.
For example, if 5 compression tests are performed under a constant environment, the same operator and the same test piece material, if the strength value obtained each time does not change much, it means that the equipment has good repeatability; otherwise, it means that the equipment is not stable.
National/Industry Indicators
The national standard "JJG 139-2014" generally stipulates the control of repeatability error:
The repeatability error should be less than ±1% of the test force (first-level model);
Quality equipment should be controlled at ±0.5% or lower.
Yiyu product performance
Zhejiang Yiyu Instrument Equipment Co., Ltd. continuously optimizes the equipment structure design and processing accuracy, adopts high-strength frame structure and silent hydraulic loading system to ensure the structural rigidity and system stability of the equipment after long-term operation. The following is the measured performance of Yiyu instrument:
The repeatability error is generally controlled at ±0.3% ~ ±0.5%;
High-end electro-hydraulic servo models can even achieve ±0.2% repeatability stability;
The test data fluctuates little, which is suitable for scientific research, quality inspection and high-precision test scenarios.
This performance advantage is also the key to Yiyu's wide application in national laboratories and materials research institutions of colleges and universities.

What are the precautions when running the concrete compression test machine

Preparation before operation
1. Equipment inspection and calibration
Before the concrete compression test begins, the equipment must be systematically inspected, including:
Check whether the oil pipes and cables are firmly connected;
Check whether the main engine and control cabinet are loose, leaking oil or making abnormal noises;
Confirm that the loading piston is zeroed and the pressure plate is clean and free of foreign matter;
Check whether the sensor and pressure gauge are in the calibrated state and recalibrate if necessary.
Yiyu Instruments' factory equipment is accompanied by inspection certificates and provides periodic calibration services to ensure that customers have stable equipment performance and accurate data during long-term use.
2. Environmental and power supply conditions
The test environment should meet the following conditions:
No strong vibration and electromagnetic interference in the room;
The temperature is controlled at 10~35℃, and the relative humidity does not exceed 80%;
Use an independent voltage-stabilized power supply to avoid voltage fluctuations affecting system performance.
Yiyu products use industrial-grade control systems and anti-interference designs, which can operate continuously and stably in complex environments.
Operational precautions during the test
1. Correctly install the concrete specimen
Place the concrete cube or cylinder in the center of the lower platen, keeping the upper and lower surfaces of the specimen parallel to the platen. If the surface of the specimen is uneven, use plaster or mortar to level it.
Yiyu concrete compression tester is equipped with an automatic leveling device and a limit centering system to avoid eccentric loading and improve test accuracy.
2. Control the loading rate
According to the national standard GB/T 50081-2019, the loading rate of concrete compressive strength test is generally 0.5~1.0 MPa/s. Too fast or too slow may cause test data distortion or specimen bursting.
Yiyu instrument adopts servo electro-hydraulic proportional control technology to achieve closed-loop control of loading rate, and has automatic protection function to avoid equipment damage or personal injury caused by misoperation.
3. Observe and record the test process
During the test, the stress state of the specimen should be observed throughout the test. When abnormal sound, specimen tilt or crack expansion is found, loading should be stopped in time. After the test is completed, record the peak test force and properly save the data.
Yiyu compression test machine supporting data acquisition system can automatically record loading curves, peak data archives, and can export Excel/PDF reports to improve data management efficiency.
Post-operation maintenance and safety management
1. Equipment cleaning and maintenance
After each test, the pressure plate and surrounding concrete debris should be cleaned in time, and the pressure head and guide rails should be checked for oil or wear. Regularly add hydraulic oil and replace the filter element to keep the equipment running smoothly.
Yiyu provides equipment maintenance manuals and video operation guides for all customers, and has a dedicated after-sales team to support remote or on-site services to help customers extend the service life of the equipment.
2. Personnel training and operating specifications
Test operators must receive professional training and be familiar with the equipment structure, control system and safety protection requirements. It is strictly forbidden to operate the test machine privately without training and authorization.
Yiyu Instruments provides customers with on-site delivery training, online operation courses and test standard explanations to help customers form a complete quality management closed loop from equipment to personnel.
3. Regular calibration and technology upgrades
Equipment should be calibrated and tested at least once a year, and the control system or software should be upgraded when necessary to ensure long-term data consistency and testing capabilities.
As a national high-tech enterprise, Yiyu has continuous R&D capabilities. All product control systems can be upgraded and maintained remotely, helping customers quickly adapt to changes in industry standards.