Table of Contents
Who created The Cube test?
The Knox Cube Imitation Test (KCIT, or CIT, or KCT) was developed as a nonverbal intelligence test developed by Dr. Howard Andrew Knox, a medical officer at Ellis Island. It was first published as a pamphlet in 1913, and then in 1914 as a paper in the Journal of the American Medical Association. The cube imitation test was developed by Knox (1913) as a nonverbal test of intelligence. Many variants show satisfactory reliability, but performance is correlated both with Verbal IQ and with Performance IQ. Performance is impaired by cerebral lesions but unrelated to the side of lesion.
How cube test is done?
Procedure to make Cubes for test Clean the mould and apply oil. Approximately 5 cm thick layers of concrete are to be filled in the mould. Each layer is compact with not less than 35 strokes per layer with a tamping rod. The top surface to be leveled and smoothen by a trowel. For cube test two types of specimens either cubes of 15cm X 15cm X 15cm or 10cm X 10cm x 10cm depending upon the size of aggregate are used. For most of the works cubical molds of size 15cm x 15cm x 15cm are commonly used. Cubes: – Place concrete in three layers giving each layer at least 35 blows of a 25mm square blunt-ended tamping rod. The purpose of a concrete cube test is to ensure that the concrete meets its expected compressive strength. If the concrete doesn’t hit its design strength – or if it hasn’t been tested – the supplier can’t guarantee its quality.
What happens if a cube test fails?
Generally we do Rebound hammer test when the concrete cube fails. But rebound hammer test is only for checking the hardness of the concrete . No absolute assessment can be done with a rebound hammer. Ultrasonic test and if this also fails then go for core cutter and test it to get actual strength of laid concrete. Generally we do Rebound hammer test when the concrete cube fails. But rebound hammer test is only for checking the hardness of the concrete . No absolute assessment can be done with a rebound hammer. Ultrasonic test and if this also fails then go for core cutter and test it to get actual strength of laid concrete. The purpose of a concrete cube test is to ensure that the concrete meets its expected compressive strength. If the concrete doesn’t hit its design strength – or if it hasn’t been tested – the supplier can’t guarantee its quality. Acceptance Criteria of Concrete Cube Test Results The individual variation of the specimens should not be more than ± 15% of the average strength if more than the test specimens are invalid. Acceptance Criteria of Concrete Cube Test Results The individual variation of the specimens should not be more than ± 15% of the average strength if more than the test specimens are invalid.