This practice covers procedures for making and curing cylinder and beam specimens from representative samples of fresh concrete for a construction project. C 31/C 31M Practice for Making and Curing Concrete Test 1 This test method is under the jurisdiction of ASTM Committee C09 on. Concrete. ASTM Standards: 2. C 31/C 31M Practice for Making and Curing Concrete Test. Specimens in the Field. C 42/C 42M Test Method for Obtaining and Testing .

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Please make sure your rods are clean and have a smooth hemispherical tip before use, as specified in ASTM C Non-consent will result in ComScore only processing obfuscated personal data. Step 2 If you are also doing slump, temperature, and air content on this sample, note that you must have these cylinders made within 15 minutes of astn the sample, so plan accordingly and set up your asstm area beforehand ASTM C Paragraph 4.

Significance and Use of ASTM C31 Concrete cylinder samples are made for your lab technician to break in a hydraulic press machine and find the compressive strength of the concrete that is being poured for a specific part of a structure. Typically for 6x12s we break 2 at the seven day mark and 2 at the 28 day mark and leave asrm spare cylinder to break on the 56 day mark if the cylinders have still failed to aatm the required strength.

Batch tickets contain lots of useful information, like which mix design is being used on that pour and how long it has been since the truck left the plant it is recommended that concrete that has been out more than 90 minutes should not be used in a pour, because concrete will start to harden up and be very difficult to pour evenly.

If steel molds are used, mineral oil will also be needed to lightly coat the inside surface of the mold and keep the concrete from sticking to the mold. Once they are in the moisture room and in the system you are all done. Label each cylinder mold with the project number, the date and time you made the asym, and the sample number. This supports the Maven widget and search functionality. You will get a representative sample of freshly mixed concrete from the truck or mixer, perform slump, temperature, and air content tests on it, and then make cylinders that will be taken back to the lab.

ASTM C31 – Making and Curing Concrete Test Specimens in the Field

Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience. The ultimate goal of the sampling process is to have a sample 3m is an average representation of what is going into the pour, to get the most accurate strength value in the lab.


I would advise you to carry an extra set of each size of mold to every job, because you never know if you might be asked to make another set. This is used for a registered author who enrolls in the HubPages Earnings 31n and requests to be paid via PayPal. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Asmt s: Use on a local area network or other network is not permitted.

The cylinder diameter needs to be at least 3 times as wide as the largest piece of aggregate the nominal aggregate sizeso we only make 4x8s when the nominal aggregate size is less than 1.

ASTM C31 / C31M – 18b Standard Practice for Making and Curing Concrete Test Specimens in the Field

For vibration, see 3B. Comments are not for promoting your articles or other sites. It helps to group your equipment by test, so you have everything you need for each test in one place. The bottom layer must be penetrated to the bottom of the mold, and for the layers above it you must go through that layer and about an inch into the layer below it.

Distribution of the PDF is not permitted. You will know when the vibration is done when the surface of the concrete is relatively smooth and air bubbles have stopped coming up to the top surface.

ASTM C31 – Making and Curing Concrete Test Specimens in the Field | Owlcation

You could also use an air compressor to remove the mold quickly, using something to create a small hole at the bottom of the mold and blowing air through that. This is used to identify particular browsers or devices when the access the service, and is used for security reasons.

Drive carefully, these are the only samples you’ve got. Step 3 For rodding, see 3A. Some articles have Vimeo videos embedded in them. Link to Active This link will always route to the current Active version of the standard.

All cylinders in a set should be started at the same time and have their layers added at the same time you do not add three layers for one and then move on to the next cylinder, they must all asm their first layer added and rodded atm you move on to layer 2. Ours has shelves labeled with a date, and we store them on the day they are meant to be broken, not the day they were made.


You can typically get water from a hose on the side of the concrete truck, or you could possibly bring your own water in a sealed container. Protect cylinders with suitable cushioning material to prevent damage from jarring.

For a volume license the PDF is licensed to the person in which it is assigned. Cylinders need to be 311m up anywhere from 18 to 48 hours after they are made.

ASTM C31 – Making & Curing Concrete Specimens in the Field

Some articles have Google Maps embedded in them. If you are vibrating the cylinders to consolidate them, you will always have 2 equal layers to put into the mold, but for 4x8s you insert the vibrator one time per layer and for zstm you insert it twice per layer.

No data is shared with Facebook unless you engage with this feature. When strength is used as a basis for acceptance of concrete, specimens must be molded atsm cured according to ASTM C For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: This service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles.

Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already. Google provides ad serving technology and runs an ad network. This is used to provide data on traffic to our website, all personally identifyable data is anonymized.

Report the following for each sample brought into the laboratory: Other product and company names shown may be trademarks of their respective owners.

Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. No data is shared unless you engage with this feature. To provide a better website experience, owlcation. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Cylinders shall have free water maintained on their surfaces at all times and remain in a constant temperature of It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. A minimum-maximum thermometer shall record the temperature of the initial curing period, and then recorded upon retrieval of cylinders.