đź•‘ Reading time: 1 minute
The Powers remolding test is a workability test conducted on concrete and was developed by Powers in 1932. The test was then standardized and employed by the US army corporation of Engineers as CRD C6-74. It is similar to a vee bee consistometer test on concrete.
Contents:
Powers Remolding Test Procedure
Powers remolding test employs a 12-inch diameter cylindrical mold. The mold is mounted over a standard drop table. A ring of diameter 8 1/4 inch is attached to the top of the mold, as shown in the figure below:
A standard slump cone is placed inside the ring into which the concrete sample is placed and compacted. A clear plate with a vertical stem attachment rests on the concrete.
The test determines the number of drops required to remold the concrete to the shape of the outer cylinder. It is measured as the "remolding effort". The ring attached to the outer cylinder is used to determine the plastic shear capacity of the given concrete mix.
The ring during the procedure restricts the movement of the concrete. If the concrete mix passes through the ring effortlessly, then the mix has high shear capacity. If the concrete mix finds it difficult to pass through, followed by clogging and high effort to remold, then the concrete mix is said to have less shear capacity.
Features of Powers Remolding Test of Concrete
Powers remolding test primarily differs from the vee-bee test based on the mode of vibration. An electric vibrator is used in the vee-bee test, while the powers remolding test employs drops.
The quantity measured in the powers remolding test is the number of drops that are required to remold the concrete present in the slump cone into the cylinder.
Powers remolding test is a single point test, where a single value of the test is obtained as a result. During the process, the drop table develops a high shear rate initially. This later decreases to zero quickly as the test progresses.
Powers remolding test determines the workability of the concrete by forcing the concrete to move in certain patterns through the opening. The method is more focused on the study of the rheological behavior of concrete.
Advantages of Powers Remolding Test of Concrete
The main advantages of Powers remolding test on concrete are:
- Powers remolding test is a dynamic test procedure.
- Best suitable for low-slump concrete.
- The test results are obtained directly.
Disadvantages of Powers Remolding Test of Concrete
- The drop table must be placed over a surface that can absorb the vibrations.
- The test is so bulky that it restricts its use in the field.
- Powers remolding test can only be performed on low-slump concrete.
FAQs
What is the Powers Remolding Test on Concrete? Powers remolding test is a vibration test method used to determine the workability of concrete. It also gives an idea of the shear capacity of the concrete mixture.
What is the difference between the Powers remolding test and the Vee Bee test on concrete? Powers remolding tests primarily differ from the vee-bee test based on the mode of vibration. In the vee-bee analysis, an electric vibrator is used, while the powers remolding test employs drops.
What is the test apparatus for the Powers remolding test on concrete? Powers remolding test employs a 12-inch diameter cylindrical mold. The mold is mounted over a standard drop table. A ring of diameter 8 1/4 inch is attached to the top of the mold, as shown in figure-1 below.
Fig.1. Powers Remolding Test Apparatus
A standard slump cone is placed inside the ring into which the concrete sample is placed and compacted. A clear plate with a vertical stem attachment rests on the concrete.
Read More:
