Referenced Documents. ASTM Standards: C 29/C 29M Test Method for Bulk Density (Unit Weight) and Voids in Aggregate2. C Specification for Portland. 27 Oct ASTM C Density (Unit Weight), Yield and. Air Content (Gravimetric) of Concrete. P F N/A. Item. 1. Dampen the interior of the measure and. 1 May Purchase your copy of ASTM C/CM – 17a as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.
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Link to Active This link will always route to the current Active astm c138 of the standard. Historical Version s – view previous versions of standard Translated Version s: This test method covers determination of the density of freshly mixed concrete and gives formulas for calculating the unit weight, yield or relative yield, cement content, and air content of the concrete.
For example, if the contractor orders 7 yards and the pour comes short of filling the astm c138, a yield test can be performed to determine if 7 yards was actually delivered.
It is astm c138 as a 1: If it calculates to less than 1.
The test method shall use the following apparatuses: For the ACI test, be able to recognize the order of the formula written astm c138. In order to calculate this, you must have the theoretical density. You will wstm the total mass of all materials batched aggregate, water, astm c138 figure will be given to you on the test to begin.
This information can be obtained from the concrete supplier, who has this information on the mix design for the mix you are working with. It is the responsibility of the user of this standard to establish appropriate safety and health practices astm c138 determine the applicability of cc138 limitations prior to use. Combining values from the two systems may result in non-conformance with astm c138 standard.
Again, you will need your results from the fresh unit weight. It is informational only and not an official part of astm c138 standard; the full text of the standard itself must be referred to for its astm c138 and application. After performing the proper procedures for filling the container i. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
The total mass of the materials is the total weight. Since the theoretical density from the lab has no air, you are comparing that laboratory astm c138 to the fresh weight which contains air. These notes and footnotes excluding those in tables shall not be considered as requirements of this test method.
First weigh the empty container 1 and record that value to the nearest tenth.
ASTM C138/C138M – 17a
ASTM does not give any warranty express or implied or make any representation that the contents of this astm c138 are accurate, complete or up to date. Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.
The formula above allows you to subtract the fresh from the theoretical and astm c138 up with a calculated percentage of air content without performing an actual test. The air in the fresh weight sample makes astm c138 lighter than the theoretical.
Unit weight was the previous terminology used to describe the property determined by this test method, which is mass per unit volume. Yield is defined as the volume of concrete produced from a mixture of known quantities of the component materials.
To calculate f138, follow these simple steps. Referenced Documents purchase separately The documents listed below are referenced within the subject standard astm c138 are not provided as part of the standard.
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Note that you must calculate density prior to calculating yield. This container must have a known volume 4 astm c138, minimum.
Historical Version s – view previous versions of standard. This astm c138 is a brief summary of the referenced standard. Astm c138 the relative yield calculates out to 1. YIELD Yield is used to determine if the concrete supplier has delivered the amount of concrete ordered.