This standard outlines the specifications for moulds used to measure the linear shrinkage of remoulded soils, a critical parameter in soil mechanics and foundation engineering. It details the required materials, dimensions, tolerances, and marking protocols to guarantee precise and uniform shrinkage assessments, aiding geotechnical evaluations and construction quality assurance.
Overview
This standard outlines the specifications for moulds used to measure the linear shrinkage of remoulded soils, a critical parameter in soil mechanics and foundation engineering. It details the required materials, dimensions, tolerances, and marking protocols to guarantee precise and uniform shrinkage assessments, aiding geotechnical evaluations and construction quality assurance.
Audience
Contents
Structure
This section defines the extent and fundamental requirements for moulds used in linear shrinkage tests, including detailed dimensions (refer Fig. 1) and tolerances following IS 2102 (Part 1):1980 medium class. It also covers marking and quality assurance under BIS regulation, along with related standards such as IS 292 for brass materials.
Lists and describes relevant Indian standards incorporated by reference, including IS 292 for brass materials, IS 919 (Part 1) for dimensional tolerances, IS 2720 (Part 20) for soil testing procedures, and IS 2 for rounding numerical values. Highlights the interrelation of these standards in ensuring mould conformity.
Covers general provisions related to materials, dimensions, and tolerances for mould components, emphasizing compliance with IS 292 and IS 2102. Specifies requirements for marking and securing screws, along with quality assurance mandates.
Details the material specifications per IS 292:1983 applicable to all mould parts including the body, end plates, and screws. Emphasizes the use of leaded brass or suitable metals ensuring durability and dimensional stability.
Describes the exact mould measurements as per Fig. 1 and the application of medium-class tolerances per IS 2102 (Part 1):1980 where not otherwise specified. Includes tables summarizing tolerance values applicable to various dimension ranges.
Specifies mandatory markings on each mould for manufacturer identification and batch numbering. Explains the use of the BIS Standard Mark indicating compliance and quality under the BIS Act, 1986, along with durability and legibility requirements.
Outlines the number and type of components involved in mould assembly including end plates and securing screws. Details material conformity, dimensional standards, and tolerances for each component to ensure proper assembly and function.
Discusses the quality control system managed by BIS for products bearing the Standard Mark. Covers licensing conditions, ongoing surveillance, test rounding rules as per IS 2, and integration with related standards to maintain product conformity.
Frequently Asked
The mould components, including the body, end plates, and securing screws, must adhere to the material standards set by IS 292:1983. This typically involves the use of mild steel or medium carbon steel, offering adequate mechanical strength and resistance to corrosion to maintain dimensional accuracy during linear shrinkage testing.
Dimensions for the mould and its parts must conform to the specifications illustrated in Fig. 1 of the standard. For any dimensions not explicitly defined, medium class tolerances per IS 2102 (Part 1):1980 apply. All components must be manufactured using materials that comply with IS 292:1983 to ensure structural integrity and accuracy.
Each mould must bear clear, durable, and permanent markings that indicate the manufacturer’s identification and a unique batch number. These markings are essential for traceability and are usually engraved or stamped on visible parts of the mould, such as the end plates, to withstand handling and environmental exposure.
The mould serves as a standardized container to prepare soil samples with uniform dimensions. Soil is compacted within the mould, dried, and then removed to measure the change in length. The linear shrinkage percentage is calculated by comparing the original length with the dried sample length, following procedures outlined in IS 2720 (Part 20).
Quality control measures include verifying that all components meet the material requirements of IS 292:1983, ensuring dimensional accuracy as per the standard, confirming clear markings of manufacturer and batch number, inspecting for any defects or corrosion, and assembling with specified screws. These steps guarantee that the moulds fulfill the criteria needed for reliable linear shrinkage measurements.
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