From assessing the load-bearing capabilities of concrete samples to testing the flexural strength of beams, the concrete compression test is a core testing method for assessing the durability and strength of concrete samples. It ensures structural integrity during construction, enables quality control, and keeps us safe. The most important part of any successful compression test is choosing the right equipment for the job, especially the compression test machine.
Reliability and accuracy are essential. Equally important is affordability. The key to picking the best tools is finding the right balance between quality and cost. In this article, we’ll shed some light on the options available to you, show how much you should expect to pay, and reveal where you can find the best equipment for your next concrete compression test.
What is a Compression Test Machine?
The compression test machine involves slowly compressing a concrete sample to assess its properties. It tells us a lot about the structural integrity of a specimen and allows us to make informed decisions about quality and durability.
The concrete compression test machine is an essential testing method in the construction industry. Professionals often use the technique to evaluate the properties of concrete samples. For example, if a concrete test cylinder crumbles and fractures when it comes under 1000kN of force, this may reveal that the mixture is unsuitable for construction applications in which the concrete will come under high amounts of compressive strain, such as when supporting a structure. Compression tests are also essential when testing the flexural strength of concrete beams.
Compressive strength testing is performed with the compression test machine. These machines feature a mechanical or hydraulic system capable of applying gradual compressive force onto a sample until it fails, fractures, or breaks. The results can then be recorded to assess the compressive strength of the concrete specimen.
The concrete compressor you choose will determine the maximum amount of force it can apply to your sample and the test method you’ll use. Let’s look at some of the different machines available to you in more detail.
What are the Different Types of Concrete Testing Machine?
The concrete testing machine you purchase can significantly impact the efficiency, versatility, and affordability of your testing experiments.
Some machines are purpose-built for specific tasks, such as measuring changes in sample length when concrete comes under tensile stress. Others are useful for a broader range of compression testing applications. Let’s explore some of the key compression testing devices and their uses.
Manual compression testing machines: This testing machine relies on manual operation to apply a compressive force. It is typically controlled by a hand-operated lever or manual hydraulic pump. Manual machines are more affordable than automatic, digital compression testing machines. That said, they are less efficient and more prone to human error.
Automatic compression testing machines: Automatic compression testers are fully automatic, equipped with motorized pumps and digital control panels. They require minimal manual intervention and will typically store test results automatically for further analysis. Though more expensive, they are considerably more efficient and offer advanced analytical features that make getting reliable, accurate results easier.
Compressometers: The compressometer is a specialist instrument that measures deformation during compressive strength tests. Once the load is applied, the strain value of the concrete is displayed on the compressometer. Most compressometers will come fitted with a dial indicator that amplifies displacements, allowing for easier measurements.
Extensometers: An extensometer is a specialist tool that measures the length change of a concrete cylinder when it is placed under tensile or compressive stress. Extensometers often combine with compressometers, allowing the tester to measure horizontal and vertical displacement simultaneously.
How Much Force Can a Concrete Compressor Apply?
Different compression test machines are available depending on the application for which you require them.
Most common machines have a total capacity of 250k, 300k, 400k, or 500k. This refers to the amount of force the device can apply in pound-force. For example, 250k represents 250,000 pound-force.
To put this into perspective, this means that a 500k compression tester can compress a concrete sample with a maximum of 500,000 pounds of force. We can convert pound-force to kilonewtons (kN) by multiplying the pound-force number by 0.004448. Let’s put this into practice for our 500k concrete compressor:
500,000 pound-force (lbf) x 0.004448 = 2,224 kilonewtons (kN).
This calculation shows that a 500k compression tester can compress a sample with up to 2,224 kilonewtons of force. This is vital information for material testers as it indicates which compression testing machine is best suited for different concrete samples.
The test kit that’s best for you will depend on the material you’re testing. Most standard concrete compression tests only require a 250k or 300k compression tester. That said, for high-strength concrete used in the production of bridges, dams, and skyscrapers, a 500k compression tester is essential.
How Much does a Testing Machine Cost?
Onto the most important question – how much should you expect to pay for your concrete compression testing machine? As previously stated, the cost of your machine will depend on several factors, including:
● The pounds of force it can apply
● The quality of the machinery
● The level of automation
It’s always best to choose a high-quality machine whenever possible. A recognized machine from a reputable brand will ensure you get accurate, reliable results each and every time. Let’s explore some of the different options available to you and the average price range when you buy from a respected material testing supplier like CertifiedMTP:
● 250k Concrete Compressors: $14,000 – $22,000
● 300k Concrete Compressors: $19,000 – $20,000
● 400k Concrete Compressors: $20,000 – $24,000
● 500k Concrete Compressors: $28,000 – $32,000
● Compressometers: $800 – $4000
● Extensometers: $2500 – $4000
Note that the prices here depend on the complexity and automation capabilities required from your machine. Some 250k devices, such as the outstanding Gilson MC-250PR, come with a Pro-Plus Controller requiring some degree of manual input. Others, like the Gilson AC-250, are almost entirely automatic and provide additional testing applications, such as flexural beam and Poisson’s Ratio testing.
Where Can I Find the Best Equipment for Concrete Compression Testing?
First-rate compression start with first-rate equipment. If you’re looking to perform accurate, reliable compression tests, choose Certified MTP as your best-in-class equipment supplier.
We stock a wide range of 200k, 300k, 400k, and 500k compressors from leading brands like Gilson Company and Humboldt Mfg. All of our equipment meets or exceeds the requirements set by the ASTM C39 and ACI 368 standards for rigidity and reliability, so you know you’re getting the highest quality tools whenever you shop with CertifiedMTP.
When planning for your next compression, consider all of the additional equipment you’ll need. CertifiedMTP also offers an extensive range of cylinder test sets, concrete cylinder lifting handles, test cylinder molds, and canvas wraps for safe transportation.
Looking for something else? Why not get in touch? We’re always happy to help you find what you’re looking for. Whatever your material testing applications, CertifiedMTP has the products, expertise, and knowledge to help you find the best equipment for the job.
