Concrete testing equipment for ASTM C470 requirements is where Certified MTP really shines. We offer high-quality concrete test cylinder molds at prices that won't break the bank. That's because adhering to the standard test method outlined in ASTM C39 for measuring the compressive strength of concrete cylinders is just that important. You need accurate and reliable results to ensure your construction project—especially when it comes to building a foundation—is solid.
Our test cylinder molds are non-absorbent, climate resistant and won't expire. They're made from high-quality, weather-resistant materials with dimensional tolerance and a consistent shape and dimensional integrity. That means you can trust the results you get from them.
We offer custom printing for your concrete test cylinders. If you need help with that, just get in touch.
We've got the concrete test cylinders you need. You can find our 4x8 Concrete Test Cylinder Molds (36 per case or 96 per case), Metal 6x12 Concrete Testing Cylinders or Concrete Testing Accessories and Concrete Curing supplies here.
Our concrete cylinder molds for sale come in a range of sizes: from 2x4in (80 per case), 3x6in (50 per case), to 6x12in (20 per case or 36 per case) molds and lids.
So what are concrete cylinders? They're the standardized test specimens used to determine the compressive strength. Made from fresh concrete and cured under controlled conditions, they give you a reliable method for evaluating the strength and durability of concrete.
Concrete cylinders are typically 4x8in or 6x12in (100x200mm or 150x300mm) in diameter by length. They're made from a representative sample of the concrete mix used in the project. The molds they're cast in are designed to meet the requirements of ASTM C31 and other relevant standards. The concrete test specimens are ensured proper curing conditions.
You'll use concrete cylinders to test the compressive strength of concrete at different ages—usually 7, 28 and 56 days. The testing process involves pouring fresh concrete into the molds, allowing it to cure, then testing the compressive strength of the concrete using a compression testing machine.
That tells you whether the concrete meets the required strength specifications—and whether the mix used in the project is suitable for the job.
Concrete cylinders test the compressive strength of hardened concrete. That's one of the most common tests used by engineers when designing buildings and other structures with a concrete foundation. You take concrete samples or specimens from the mixer truck and should follow ASTM C 172 to ensure those specimens are representative of the concrete delivery units.
How many cylinder molds for concrete testing you need can vary. Typically three concrete specimens of the same size are cast in concrete cylinders for testing. However, you'll usually cast two to six concrete cylinders for every 150 cubic yards of concrete placed. Check with ASTM for the specific concrete cylinder tests required to ensure the quality and safety of the foundations and structures.
ASTM C 31 and ASTM C 39 allow the use of 4x8 in cylinder molds or 6x12 in cylinder molds as long as your project meets certain requirements. The concrete cylinder testing diameter must be at least three times the nominal maximum size of the coarse aggregate. That means you can specify 4x8 test cylinders if no aggregate used for making the concrete cylinder is retained on a 1¼ in. (31.5 mm) sieve. If retained, you'll need 6x12 concrete cylinders or another testing solution.
When in doubt, read up on concrete cylinder molds regulations.
Before you test concrete cylinders, read up on the official concrete cylinder testing regulations and procedures from ASTM. That's where you'll find the rules and regulations for concrete cylinder testing that cover most construction projects and applications-you'll likely need those for your project.
ASTM C 31, Compressive Strength of Cylindrical Concrete Specimens, is just one of those regulations. So are ASTM C 39, ASTM C 172, ASTM C 617 and ASTM C 470. If you're looking to buy plastic concrete cylinder molds for concrete testing, Certified MTP is a trusted supplier.
Their concrete testing cylinder molds are part of a wide range of concrete testing equipment they keep in stock. You'll also need a stripping tool to remove the single piece test cylinder molds from the test cylinder. That tool usually comes with a T-Handle or a screwdriver handle.
If you need custom printing for your cylinder molds, they can be made of hard plastic and feature your business logo. That's a great way to make your cylinders stand out.
That's where the purpose of test cylinder molds comes in. They're used to create standardized specimens that represent the strength of the composite sample taken from the job site. You make these molds from plastic, steel or other rigid materials and use them to hold fresh concrete while it cures. Molding the concrete cylinders must be done carefully to avoid air pockets or inconsistencies that will affect the test results.
Test cylinder molds come in different sizes, 4 inches in diameter by 8 inches in height or 6 inches by 12 inches, depending on the specific requirements of ASTM C 31 and project specifications. The size and type of the mold is determined by the structural work and the concrete mix used.
Curing of test cylinders is one of the most important parts of ASTM C 31. Curing is necessary to maintain the moisture and temperature conditions required for the strength to develop as designed. Improper curing can cause moisture loss, which can weaken the concrete strength and cause durability issues.
There are two types of curing for concrete cylinders as specified by ASTM C 31. One is initial curing, where the test cylinders are stored at the job site and protected from freezing, excessive heat and moisture loss. The goal is to create a stable environment for the test cylinders before they are transported to the lab for further testing.
That usually takes 24 to 48 hours. During that time, the test cylinders are kept in conditions that minimize moisture loss and temperature fluctuations. They may be covered with wet burlap, plastic sheeting or even submerged in water, depending on the site conditions. ASTM C 31 requires that the temperature for initial curing be maintained between 60°F to 80°F (16°C to 27°C).
The other type is final curing. After initial curing, the test cylinders are transported to a laboratory or water storage tanks for final curing. During this stage, the cylinders are kept in conditions that simulate the standard curing environment as specified by ASTM C 31. That means the cylinders are submerged in water or stored in a controlled environment where the temperature is maintained at 73.5°F ± 3.5°F (23°C ± 2°C) to promote concrete hydration. Final curing is done until the cylinders are ready to be tested, usually at 7, 28 or 56 days, depending on the project's specifications.
Field-cured cylinders and standard-cured cylinders serve different purposes in the quality process, as specified by ASTM C 31. Field-cured cylinders are used to monitor the strength development of structural concrete under the actual conditions of the construction process. These cylinders are stored at the job site, usually in the same environment as the structure itself, to represent the in-place concrete as closely as possible. Standard-cured cylinders, on the other hand, are used to test the concrete strength in an environment.
Standard cured cylinders are stored and cured in a laboratory under conditions that are as close to ideal as possible. That's where they serve as a benchmark for concrete strength-and where the concrete mix used in a project is put to the test. The results from standard cured cylinders ensure that the ready mixed concrete meets the required strength specified by the project. And that's the goal.
Before making a concrete test cylinder, you take a composite sample of fresh concrete at the job site. That sample has to be representative of the entire batch. If it's not, the test cylinders won't give you an accurate picture of the concrete's quality. So the sampling process follows the guidelines of ASTM C172. That way, you know the sample is taken in a way that doesn't segregate the materials-and represents the concrete cylinder testing you need.
When you pour the concrete into the test cylinder molds, you do it in layers. Each layer is then rodded or vibrated to get rid of any air pockets and compact the concrete fully. Proper molding is critical here. If the test cylinder isn't made right, the results won't be accurate. And that's not what you want.
Test cylinders are used for acceptance testing to verify the concrete mix meets the strength requirements of the project specifications. You test them at specified intervals—usually 7 days, 28 days and sometimes beyond that, depending on the project requirements. The test cylinder is placed in a compression testing machine. Pressure is applied until the sample breaks. And that's when you measure the concrete strength.
The results of these tests will determine if the structural concrete meets the design strength for the specific structural work being done. If the test results show the concrete doesn't meet the required strength, it may be rejected or the mix adjusted to improve performance. These tests give contractors, engineers and ready-mixed concrete suppliers the information they need to ensure the concrete used in a structure can endure the loads and stresses it will face. Temperature and moisture are both important factors in test cylinders. During both initial and final curing, the test cylinders must be protected from extreme temperatures and moisture loss to get accurate strength development.
For standard curing, the cylinders need to be kept at a constant temperature of around 73°F (23°C) with high humidity or direct water immersion. That's when the cement can fully hydrate. Any deviation from these temperature conditions will lead to inaccurate test results. Temperature variations can either speed up or slow down strength development.
The durability of the test cylinder molds and the handling of the cylinders themselves are critical to getting accurate results. Molds must be made of materials that can withstand the construction process and transportation to the laboratory. Steel, plastic and other rigid products all conform to the specifications of ASTM C31.
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