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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The curing process will also help those in charge of the project determine how to best protect the concrete in the structure as it cures and gives them a set of limits for form and shoring removal time. When you sample the concrete, try to get your sample from the middle of the batch and not the first or last clumps of concrete, because the first or last portions may come out of the mixer slightly different from the rest of the batch.

They need time to cure under moist temperature-controlled conditions and they do not need to be overly exposed to the elements.

Label each cylinder mold with the project number, the date and time you made the asstm, and the sample number. Set them on the floor or on the table, whichever you prefer, and grab a stripping tool looks like a t-shaped metal bar and a rubber mallet. To provide a better website experience, 31.

Cylinders and beams can be placed in moist rooms or water storage tanks, but beams must be moved into water saturated with calcium hydroxide at the same temperature at least 20 hours prior to testing. Once they are in the moisture room and in the system you are all done. Use your rag to clean around the rim of the mold, wiping away excess concrete from the edge but never touching the material inside the rim.

If you are making multiple sets of cylinders with more than one truck, write asm number on the batch ticket and on your paperwork so you know which truck goes with which set of cylinders. You must have JavaScript enabled awtm your browser to utilize the functionality of this website. While you are out there making cylinders you can keep lookout for errors in the mixing and pouring of the concrete; field techs are expected to report things that go wrong to the site superintendent or project manager.


Please make sure your rods are clean and have a smooth hemispherical tip before use, as specified in ASTM C Be sure to write on your paperwork which location you are making or leaving your cylinders at, because someone else may be the one to come pick them up.

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

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. No data is shared with Paypal unless you engage with this feature. How many inches are in one layer of a concrete test specimen? Disposable molds are to be calibrated every time a new lot arrives.

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

We recommend users of early versions of Internet Explorer to update to Version 10 or later. Sign in or sign up and adtm using a HubPages Network account. 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 receiving the sample, so plan accordingly and set up your work area beforehand ASTM C Paragraph 4.

Once the cylinder is out you will need to label it and check it in through whatever system you use we use Metafield. Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience.

If there are large holes in the end of the cylinder, your lab tech will have to grind it down or saw cut the end of the cylinder, so you want it to be smooth. When you are doing the last layer, if your mold is underfilled you can add extra concrete to keep it properly filled as you rod. Combining values from the two systems may result in non-conformance with the standard. We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.


Vibrator optional — Should be internal and operate at a frequency of at least vibrations per minute. The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use. Report the following for each sample brought into the laboratory: Some articles have YouTube videos embedded in them.

The ultimate goal of the sampling process is to have a sample that is an average representation of what is going into the pour, to get the most accurate strength value in the lab. Cylinder molds can be metal or plastic, so long as they are non-absorbent, non-reactive to concrete, and maintain their shape and dimensions under all conditions of use.

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

This service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads asgm your articles. Combining values from the two systems may result in non-conformance with the standard.

Unless you are signed in to atm HubPages account, all personally identifiable information is anonymized. Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already.

HubPages and Hubbers authors may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others. Knowing the time and date will be important for the lab tech to know when to break the cylinders. When strength is used as a basis for acceptance of concrete, specimens must 13m molded and cured according to ASTM C For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: For final curing, cylinders or beams must be placed in their curing storage no later than 30 minutes after removing from the molds.