The standard outlines the specifications for equipment used in conducting the concrete slump test, which evaluates the consistency and workability of fresh concrete. It covers the required dimensions, materials, and construction details of the slump test mould and tamping bar to guarantee uniformity and dependable testing outcomes. This specification is vital for professionals involved in concrete testing and quality assurance processes.
Overview
The standard outlines the specifications for equipment used in conducting the concrete slump test, which evaluates the consistency and workability of fresh concrete. It covers the required dimensions, materials, and construction details of the slump test mould and tamping bar to guarantee uniformity and dependable testing outcomes. This specification is vital for professionals involved in concrete testing and quality assurance processes.
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Structure
Frequently Asked
The slump test mould must be a truncated cone (frustum) featuring internal dimensions as follows: a bottom diameter of 200 mm with a tolerance of +3/-1.5 mm, a top diameter of 100 mm with the same tolerance, and a height of 300 mm with a ±1.5 mm tolerance. The mould can be seamless or have a seam according to the standard figures. The wall thickness should be no less than 1.6 mm to comply with durability requirements. Additionally, the tamping bar accompanying the mould should be a 16 mm diameter steel rod, 600 mm in length, with a rounded working end to ensure proper compaction.
The slump test mould should be fabricated from galvanized iron sheets or other metals resistant to the chemical effects of cement paste, maintaining a minimum thickness of 1.6 mm. Aluminium is expressly forbidden due to its unsuitability. The tamping bar must be constructed from steel, measuring 16 mm in diameter and 600 mm in length, with a hemispherically rounded tip to facilitate uniform compaction during testing.
The tamping bar specified by the standard is a straight, round steel rod with a diameter of 16 mm and a length of 600 mm. Its working end must be rounded to a hemispherical shape, matching the 16 mm diameter, to provide efficient and consistent consolidation of concrete within the slump mould without causing damage or affecting the test results.
The standard does not explicitly mandate markings on the slump test apparatus such as the mould or tamping bar. However, it is considered good engineering practice to mark the equipment with the manufacturer's name or trademark, nominal dimensions, and, if applicable, the calibration or verification date. Such markings aid in equipment traceability, quality control, and help prevent confusion during testing.
Key construction features for maintaining accuracy and consistency include: having open, parallel ends that are perpendicular to the cone axis to ensure uniform concrete shape; a smooth internal surface free of dents or protrusions to prevent concrete adhesion; the option for the mould to be seamless or have a seam constructed as per standard guidelines to avoid leakage or deformation; securely attached foot pieces and handles for safe handling without damaging specimens; a minimum wall thickness of 1.6 mm for structural integrity; and optionally, the mould may be clamped to a non-absorbent base plate or use height guides, enhancing measurement precision.
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