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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Non-consent will result in ComScore only processing obfuscated personal data. 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.

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. How many inches are in one layer of a concrete test specimen?

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It helps to group your equipment by test, so you have everything you need aastm each test in one place. This is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal.

ASTM C31 – Making & Curing Concrete Specimens in the Field

Don’t leave them out there for a week and forget about them or your lab asfm is going to be very confused when they look for cylinders to break and find an empty moisture room. Cylinders need to be picked up anywhere from 18 to 48 hours after they are made.

Transportation and Curing Procedures Cylinders need to be picked up anywhere from 18 to 48 hours after they are made. Having the right sample number and project will help the lab know which set zstm which, which can get confusing if there are many cylinders coming in at the same time, so please label them carefully! This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.

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

This is used to display charts and graphs on articles and the author center. These notes shall not be considered as requirements of the standard. The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use.


Keep them away from the sun as well, because it can affect their temperature and change the way they cure. 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.

This is used to provide data on traffic to our website, all personally identifyable data is anonymized. Equipment Required for Making Concrete Cylinders Rods – 6×12 cylinders need the large tamping rod and 4×8 cylinders need the small tamping rod.

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

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. To strip a cylinder, insert the stripping tool into the top of the mold in wstm gap between the concrete and the mold, and hammer it all the 331m to the bottom of the mold.

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.

Whichever mold you are using, they will need to be watertight and resistant to damage from tamping, as specified in ASTM C When strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to ASTM C 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.

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. We may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.


When you are picking a place to make your cylinders, make sure it is in a level area that is free of debris, away from vibration, and away from moving vehicles and large construction equipment.

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.

Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure.

Wheelbarrow — Should be able to hold at least 1 cubic foot of concrete, the minimum size required for concrete strength testing specimens. This is a aztm services platform that we used to host our service. If sstm molds are used, mineral oil will also be needed to lightly coat the inside surface of the mold and keep the concrete from sticking wstm the mold.

Strike-off Bar — Must be clean and level and must have a flat and even plane surface. 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.

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

If you are rodding the cylinders to consolidate them, the amount of layers will vary by sample size: After you have consolidated the concrete, you will need to strike off the concrete to provide a smooth surface.

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. 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.

Javascript software libraries such as jQuery are loaded at endpoints on the googleapis. Prevent the drying of the surfaces of the beams between the removal of the water storage tank and testing.