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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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. 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.
Typically for 6x12s we break 2 at the seven day mark and 2 at the 28 day mark and leave a spare cylinder to zstm on the 56 day mark if the cylinders have still failed to meet the required strength. Cover each cylinder with 311m appropriate sized cylinder bag and place it in a protected location free of vibration and disturbances. Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience.
Drive carefully, these are the only samples you’ve got. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. After you rod each layer you need to tap the outside of your mold with an open hand about 10 to 15 times 3m1 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.
Once they are in the moisture room and in the system you are all done. 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. Strike-off Bar — Must be clean and level and must have a flat and even plane surface.
Combining values from the two systems may result aztm non-conformance with the standard.
ASTM C31 – Making and Curing Concrete Test Specimens in the Field | Owlcation
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. Some articles have Vimeo videos embedded 3m1 them. Label each cylinder mold with the project number, the date and time you made the cylinder, and the sample number.
Sign in or sign up and post using a HubPages Network account. Transportation time of cylinders shall not exceed 4 hours. Comments are not for promoting your articles or other sites.
13m articles have Google Maps embedded in them. If representing pavements of a slab on grade, bank the sides and ends with earth or sand that must be kept damp, leaving the top surface exposed.
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 x may come out of the mixer slightly different from the rest of the batch.
We asttm users of early versions of Internet Explorer to update to Version 10 or later. Disposable molds are to be calibrated every time a new lot arrives. Don’t leave them out there for a week and forget about them or your lab tech is going to be very confused when they look for cylinders to break and find an empty moisture room. ComScore is a media measurement and analytics ast, 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. Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure.
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.
Historical Version s – view previous versions of standard. All cylinders in a set should be started at the same time and have their layers added at the same time you do not add three layers for one and then move on to the next cylinder, they must all have their first layer added and rodded before you move on to layer 2.
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.
The bottom layer must be penetrated to v 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. How many inches are in one layer of a concrete test specimen?
ASTM C31 – Making and Curing Concrete Test Specimens in the Field
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. You can use this to streamline signing up for, or signing in to your Hubpages account. Be sure to write on your paperwork which location you are making or leaving your cylinders at, because someone else may be the one to come pick them up.
When transporting cylinders, you will want to make sure they don’t bounce around in the truck or fly out, so you should have some cushioned transport racks to hold them in. 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.
Combining values from the two systems may result in non-conformance with the standard. Bucket of Water and Rag — Please clean off your equipment after each use to help keep it in spec.
Other product and company names shown may be trademarks of their respective owners. If you are rodding the cylinders to consolidate them, the amount of layers will vary by sample size: Prevent the drying of the surfaces of the beams between the removal of the water storage tank and testing. This service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles.
When strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to ASTM C A minimum-maximum thermometer shall record the temperature of the initial curing period, and then recorded upon retrieval of 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. Non-consent will result in ComScore only processing obfuscated personal data. This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other 31, or shapes of specimens. This is used to collect data on traffic to articles and other pages on our site.