The 1972 edition of IS 6461 Part 6 offers an extensive glossary defining terminology related to equipment, tools, and machinery used in cement concrete construction. It standardizes nomenclature for various mixers, batching devices, placement tools, and mechanical plants, facilitating clear communication among engineers, contractors, and technical staff involved in concrete operations.
Overview
The 1972 edition of IS 6461 Part 6 offers an extensive glossary defining terminology related to equipment, tools, and machinery used in cement concrete construction. It standardizes nomenclature for various mixers, batching devices, placement tools, and mechanical plants, facilitating clear communication among engineers, contractors, and technical staff involved in concrete operations.
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Frequently Asked
IS 6461 Part 6 identifies several types of concrete mixers including: the Inclined Drum Mixer, characterized by two truncated cones joined by a cylindrical section rotating on a horizontal axis with reversible rotation for discharge; the Revolving-Drum Mixer, defined by the gross volume of its rotating drum used for mixing within a closed or semi-closed container; the Open Top Mixer, which is a trough or pan with a vertical dimension restricted to twice the radius of the circular section below the shaft; and Batch Mixers which handle concrete in discrete batches. Additionally, the standard defines 'Flush Water' as water carried on truck mixers for cleaning purposes after discharge.
According to IS 6461 Part 6 (1972), batching devices are grouped into three categories: Manual Batchers where gates or valves are manually operated with weighing accuracy dependent on the operator; Semiautomatic Batchers where gates are manually opened but close automatically once the specified weight is attained; and Automatic Batchers which feature fully automated gate operations initiated by a single starter switch, incorporating interlocks that ensure scales are zeroed before charging, prevent gate operation conflicts, and enable sequential weighing of multiple ingredients for precise batching.
The standard specifies several tools for concrete placement and finishing, including the Concrete Spreader, a machine mounted on side forms or rails to evenly distribute concrete; Concrete Finishing Machines, which are powered devices equipped with flanged wheels used for floating and texturing concrete surfaces such as pavements and slabs; and Trowels, hand-held tools with flat steel blades employed for final surface smoothing of floors and slabs. These tools collectively contribute to uniform distribution and finishing quality.
IS 6461 Part 6 encompasses shotcrete application equipment such as double-chamber pressure systems that use alternating chambers to pneumatically deliver shotcrete, single-chamber pressure systems which are less common, and positive displacement equipment where material is pushed mechanically via pistons or augers in wet-mix shotcrete. It also includes pneumatic feed systems that convey material using pressurized air streams and defines nozzles as attachments designed to project material at high velocity during shotcrete spraying.
The standard defines vibrators as oscillating devices used to agitate fresh concrete to eliminate voids and entrapped air, thereby ensuring proper consolidation. It categorizes vibration types into external vibrators attached to formwork (commonly used in precast and tunnel lining), internal vibrators inserted directly into the concrete mass (typical for in-place concreting), and surface vibrators which are portable platforms used to compact surface layers. The amplitude of vibration refers to the maximum displacement from the mean position, vital for effective compaction without causing segregation.
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