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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Distribution of the PDF is not permitted. When planning to mold and cure concrete specimens, it is required that tests for slump, temperature, and air content be performed unless entrained air is not of concern to the project. Javascript software libraries such as jQuery are loaded at endpoints on the googleapis. A minimum-maximum thermometer shall record the temperature of the initial curing period, and then recorded upon retrieval of cylinders.

Please make sure your rods are clean and have a smooth hemispherical tip before use, as specified in ASTM C Ask if all water has been added before you get your sample, and also make sure you get the batch ticket from the driver of the truck, because you will need it later on when you are entering the sample into your computer system or otherwise filling out paperwork.

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. Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already. This is used to display charts and graphs on articles and the author center.

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


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. This is used to prevent bots and spam.

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.

If the concrete design strength is 6, psi or greater, the initial curing temperature must range from 68 — 78 degrees F. These notes shall not be considered as requirements of the standard.

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

Link to Active This link will always route to the current Active version of the standard. No data is shared with Paypal unless you engage with this feature. Prevent the drying of the surfaces of the beams between the removal of the water storage tank and testing. Sample the concrete in accordance with ASTM C, making sure to mix your concrete sample thoroughly. Non-consent will result in ComScore only processing obfuscated personal data.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The values stated in each ast, may not be exact equivalents; therefore, each system shall be used independently of the other.

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 astk. Protect the surfaces of both in the same manner the structure is protected, as best as possible. 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. This is an ad network. Rods – 6×12 cylinders need the large tamping rod and 4×8 cylinders need the small tamping rod.


This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens. The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use.

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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

It helps to group your equipment by test, so you have everything you need for each test in one place. Aztm molds — These can be plastic or steel, but we typically use plastic molds. Use a back-and forth left-to-right sawing motion, starting in the middle and working away from you, then come back to the middle and move the strike-off bar towards you, still performing the same sawing motion.

Some articles have YouTube videos embedded in them. These notes shall not be considered as requirements of the standard. 3m

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

To provide a better website experience, owlcation. How many inches are in one layer of a concrete test specimen? 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. 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.