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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These samples provide quality control for architects and engineers and allow them to determine if they will be able to put that concrete into service for their structure, or if they need to remove what they have poured.

Cover each cylinder with an appropriate sized cylinder bag and place it in a protected location free of vibration and disturbances. Distribution of the PDF is not permitted. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: This is used to provide data on traffic to our website, all personally identifyable data is anonymized. If you are making multiple sets of cylinders with more than one truck, write the number on the batch ticket and on your paperwork so you know which truck goes with which set of cylinders.

Vibrator optional — Should be internal and operate at a frequency of at least vibrations per minute. This website uses cookies As a user in the EEA, your approval is needed on a few things. ComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already.

This is used to provide traffic data and reports to the authors of articles on the HubPages Service. It is very important for the integrity of any test to have clean, working equipment. You must have JavaScript enabled in your browser to utilize the functionality of this website.

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This is used to identify particular browsers or devices when the access the service, and is used for security reasons. Having the right sample number and project will help the lab know 31n set is which, which can get confusing if there are many cylinders coming in at the same time, so please label asmt carefully!


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. 3m 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.

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Please choose which areas of our service you consent to our 311m so. Typically for 6x12s we break 2 at the seven day mark and 2 at the 28 day mark and leave a spare cylinder to break on the 56 day mark if the cylinders have still failed to meet the required strength.

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

This is feature allows you to search the site. 331m provide a better website experience, owlcation. 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.

For final curing, cylinders or beams must be placed in their curing storage no later than 30 minutes after removing from the molds. For vibration, see 3B. 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. After you rod each layer you need to tap the outside of your mold with an open hand about 10 to 15 times plastic molds may be damaged if you use a mallet to let excess air out of the cylinder and close the holes from rodding ASTM C31 Paragraph 9.

Cylinders shall have free water maintained on their surfaces at all times and remain in a constant temperature of 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. 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.

The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use. Warning; Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. After the cylinder has been picked up, checked in, and carefully labelled make sure you have the right sample number and date! Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.


We partner with Say Media to deliver ad campaigns on our sites. When strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to ASTM C Cylinders need to be picked up anywhere from 18 to 48 hours after they are made.

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

Work Item s – proposed revisions of this standard. Cylinder molds — These can be plastic or steel, but we typically use plastic molds. 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.

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.

For both sizes, each layer will be rodded 25 times in an even pattern, distributing the holes uniformly over the cross-section of the mold. Step 3 For rodding, see 3A. This is used to detect comment spam. 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.