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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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Knowing the time and date will be important for the lab tech to know when to break the cylinders. 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.

To strip a cylinder, insert the stripping tool into the top of the mold in the gap between the concrete and the mold, and hammer it all the way to the bottom of the mold. This website uses cookies As a user in the EEA, your approval is needed on a few things.

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. 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. 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.

Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: ComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. 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 strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to ASTM C Combining values from the two systems may result in non-conformance with the standard. For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: 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.


Wheelbarrow — Should be able to hold at least 1 cubic foot of concrete, the minimum size required for concrete strength testing specimens.

Once the cylinder is out you will need to label it and check it in through whatever system you use we use Metafield. Some articles have Google Maps embedded in them. Transportation and Curing Procedures Cylinders need to be picked up anywhere from 18 to 48 hours after they are made. No data is shared unless you engage with this feature.

If you are vibrating the cylinders to consolidate them, you will always have 2 equal layers to put into the mold, but for 4x8s aztm insert the vibrator one time per layer and for 6x12s you insert it twice per layer. Combining values from the two systems may result in non-conformance with the standard.

ASTM C31 – Making & Curing Concrete Specimens in the Field

Vibrator optional — Should be internal and operate at a frequency of at least vibrations per minute. Once they are in the moisture room and in the system you asm all done. Strike-off Bar — Must be clean and level and must have a flat and even plane surface. Transportation time of cylinders shall not exceed 4 hours.

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. The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use. Cylinders shall have free water maintained on their surfaces at all times and remain in a constant temperature of It helps to group your equipment by test, so you have everything you need for each test in one place.

These notes shall not be considered as requirements of the standard. Google provides ad serving technology and runs an ad network. This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.

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Historical Version s – view previous versions of standard. 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. This is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos.

This is used to provide data on traffic to our website, all personally identifyable data is anonymized. This supports the Maven widget and search functionality.

Please make sure your rods are clean and have a smooth hemispherical tip before use, as specified in ASTM C Work Item s – proposed revisions of this standard. Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience.

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

Bucket of Water and Rag — Please clean off your equipment after each use to help keep it in spec. Comments are not for promoting your articles or other sites. Drive carefully, these are the only samples you’ve got. Specimens should be shielded from direct sunlight or radiating heating devices, if used. 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.

A minimum-maximum thermometer shall record the temperature of the initial curing period, and aetm recorded upon retrieval of cylinders.

Once you’re back at the office, get the cylinders off of your truck and out of the transport racks, removing their bags. If you are making ast, 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.