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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ASTM C31 – Making and Curing Concrete Test Specimens in the Field | Owlcation
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 axtm taken back to the lab. 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.
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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. No data is shared with Facebook unless you engage with this feature. 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.
The curing process will also help 311m in charge of the project determine how to best protect the concrete asgm the structure as it cures and gives them a set 31j limits for form and shoring removal time. This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.
ASTM C31 / C31M – 18b Standard Practice for Making and Curing Concrete Test Specimens in the Field
Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience. Batch tickets contain lots of useful information, like which mix design is being used on that pour and how long it has been since the truck left the plant it is recommended that concrete that has been out more than 90 minutes should not be used in a pour, because concrete will start to harden up and be very difficult to pour evenly.
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. 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.
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Cover each cylinder with an appropriate sized cylinder bag and place it in a protected location free of vibration and disturbances. 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.
Whichever mold you are using, they will need to be watertight and resistant to damage from tamping, as specified in ASTM C This option is mobile friendly and compatible with all devices, including mobile tablets and smart phones. Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already. 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.
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ASTM C31 – Making and Curing Concrete Test Specimens in the Field
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Transportation and Curing Procedures Cylinders need to be picked up anywhere from 18 to 48 hours after they are made. This is used to prevent bots and spam. Use on a local area network or other network is not permitted. 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.
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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Warning; Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. 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.