Category: Astm c31

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ASTM C31-C31M - 08b

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ASTM C172: Standard Practice for Sampling Freshly Mixed Concrete

Price USD.Melissa has a bachelor's degree in geology, and is an ACI-certified field and lab technician at Froehling and Robertson. 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. 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.

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 cylinders' curing process will 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.

While you are out on site making cylinders, you can keep lookout for errors in the mixing and pouring of the concrete; field technicians are expected to report things that go wrong to the site superintendent, project manager, or other point of contact for that job. Rods - 6x12 cylinders need the large tamping rod and 4x8 cylinders need the small tamping rod.

Please make sure your rods are clean and have a smooth hemispherical tip before use, as specified in ASTM C Rodding is only used if the slump is greater or equal to one inch; if the mix is very dry and the slump comes out to less than an inch you will have to vibrate the concrete to consolidate it thoroughly. Cylinder molds — These can be plastic or steel, but we typically use plastic molds. 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.

Whichever mold you are using, they will need to be watertight and resistant to damage from tamping, as specified in ASTM C Disposable molds are to be calibrated every time a new lot arrives.

I would advise you to carry an extra set of each size of mold to every job, because you never know if you might be asked to make another set. Excessive concrete buildup can be removed from metal scoops and rods by soaking them in vinegar overnight, then washing them off with soap and water and coating them with mineral oil to protect the galvanization.

astm c31

Wheelbarrow — Should be able to hold at least 1 cubic foot of concrete, the minimum size required for concrete strength testing specimens. Bucket of Water and Rag — Please clean off your equipment after each use to help keep it in spec. 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. It is very important for the integrity of any test to have clean, working equipment. Vibrator optional — Should be internal and operate at a frequency of at least vibrations per minute.

astm c31

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.

Sample the concrete in accordance with ASTM C, making sure to mix your concrete sample thoroughly. 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 lab.

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.

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. Batch tickets contain a lot 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.

If you are making multiple 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. If you are also doing slump, temperature, and air content on this sample, note that you must have these cylinders made within 15 minutes of receiving the sample, so plan accordingly and set up your work area beforehand ASTM C Paragraph 4.

It helps to group your equipment by test, so you have everything you need for each test in one place.Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More C This practice is not intended for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.

Test Method D covers procedures for the preparation, curing, transporting and testing of cylindrical test specimens of CLSM. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. These notes shall not be considered as requirements of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Scope 1. Link to Active This link will always route to the current Active version of the standard.This practice is not intended for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens. Test Method D covers procedures for the preparation, curing, transporting and testing of cylindrical test specimens of CLSM.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

ASTM C31 Making and Curing Concrete Test Specimens in the Field

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Warning- Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. These notes shall not be considered as requirements of the standard.

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Full Description 1.I need to build a set of concrete steps out my kitchen door. I can't imagine it would be durable to build each step individually. Every concrete steps I have seen, make it look like the steps are one solid rock.

Bryan, it is better to cast all of these steps as one unit. There are several precast concrete plants that cast steps in a factory. Then, these steps can simply be set into place. Perform a google search and look for "precast concrete steps.

I am continuing to post summaries of ASTM standards related to precast concrete quality control testing. This blog post will focus on making and curing concrete test cylinder in the field. I will contrast this with some of the requirements in ASTM C, the practice for making and curing cylinders in a laboratory. Practice C31 is to be used for concrete having a measurable slump. It is not intended for "zero slump" concrete, also called dry cast.

ASTM C has a comparable procedure for these samples. Also, refer to an article written by Carl Buchman, P. This practice is used for Self-Consolidating Concrete with the exception that the concrete is placed in one lift and rodding is omitted. The practice of making and curing concrete cylinders in the field is important for the following reasons: SC strength acceptance as compared to the specified minimum; SC mixture proportioning and consistency; SC quality control; FC determination of an in-service date; FC as a method of comparison to other concrete made with the same design; FC to verify curing methods or methods of protecting the fresh concrete; FC for form stripping and removal.

Cylinders can vary in size, having two minimum requirements. The length must be two times the diameter, and the minimum diameter is to be three times the nominal maximum size of the coarse aggregate. Cylinders made with a coarse aggregate exceeding 2" must be sieved. The most common cylinder sizes are 6"x12" and 4"x8", with the 4"x8" cylinders becoming the most predominate size. Concrete used to make compressive test cylinders must be representative of the placed concrete.

Concrete used in other QC testing i. Molds are to be rigid enough to hold their shape. They are to be be capable of holding water. A mallet made of rubber or rawhide weighing 0. A rod measuring at least 4" more than the length of the mold having a hemispherical tip on at least one end shall be used.

Conventional concrete cylinders are made by filling the mold in three equal lifts, rodding each layer 25 times. The mallet is to be used to tap the sides of rigid molds times after each lift is rodded. An open hand is to be used on light gauge single use molds. Strike a filled mold using the tamping rod. A float or trowel may be used if permitted. Final leveling should be done after moving the filled mold to its final curing location. Section The method of curing will be specified by the agency with jurisdiction, by the customer, or as stated in the company quality control manual.Active view current version of standard.

Translated Standard: Spanish. Other Historical Standards. Work Item s - proposed revisions of this standard. More C This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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.

Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and tissue upon prolonged exposure. These notes shall not be considered as requirements of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Scope 1. Link to Active This link will always route to the current Active version of the standard.Each course includes: Self-guided training complete with video demonstrations, checklists, concept presentations, data sheets and glossaries Quiz with automatic grading Certificate upon successful completion of course and passing score on quiz.

The Learning Center provides advanced features that let you set up learning plans, track learning progress and compliance, and run reports. About the Course This course covers procedures for making and curing cylinder and beam specimens from representative samples of fresh concrete for a construction project. Learning Outcomes By the end of this course you will be able to: Explain why the slump, temperature, and air content tests are performed when strength specimens are fabricated Understand the purpose of fabricating concrete test specimens in the field Identify the equipment necessary to fabricate strength specimens that are consolidated by rodding or vibration Describe the procedure for filling and consolidating concrete cylinder molds Describe the steps for fabricating concrete beam specimens Recognize the time limitations for curing and transporting concrete test speciments.

Audience Anyone who runs the C31 test method or who needs an understanding of the test method and how it is properly run.

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Certificate Program This training course is part of the following certificate programs:. Preview a Course Click here to preview a sample course.

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