Glossary of terms relating to cement concrete, Part 12: Miscellaneous
1973 Edition

This section outlines the range of IS 6461 Part 12, which includes miscellaneous terminology related to cement concrete, such as formwork for concrete (Part V). It standardizes definitions to promote uniform understanding across concrete technology and construction fields. Clause 2.0 introduces key terms, e.g., Surface Area (2.242) referencing Clause 2.230 for detailed insights. Note that no formulas or tables are included within this scope clause; it serves primarily as a glossary to unify terminology relevant to concrete and formwork practices. For design and specification details, users are directed towards IS 456, IS 3370, and IS 10262.

This part presents a glossary of miscellaneous terms associated with cement concrete, focusing on clear and precise definitions rather than computational data. It aims to clarify terminology such as bleeding, segregation, workability, curing, setting time, and hydration. Illustrative definitions include bleeding as the upward movement of water in newly placed concrete due to settlement, segregation as the separation of coarse aggregates from mortar, and workability as the ease of mixing, placing, compacting, and finishing concrete. This glossary ensures consistent understanding of terms across projects and documentation, while design calculations are referenced in other IS codes.

While IS 6461 Part 12 primarily focuses on terminology and does not specify materials or constituents directly, it complements other standards detailing concrete materials. These include Ordinary Portland Cement conforming to IS 269 or IS 8112, aggregates as per IS 383, and potable water free from contaminants. Typical concrete properties such as compressive strength, water-cement ratio, and modulus of elasticity are referenced from IS 456 and IS 10262. Formulas like the water-cement ratio calculation and mix proportioning guidelines are provided in related codes, with IS 6461 Part 12 serving as a terminological reference.

This section offers terminology related to cement and concrete properties rather than detailed numerical data. Important concepts include compressive strength measured on standard specimens after 28 days of curing, water-cement ratio controlling strength and durability, and modulus of elasticity approximated by IS 456's formula. Density values for normal weight concrete are also noted. For comprehensive properties, test methods, and design parameters, IS 456 and IS 269 should be consulted. IS 6461 Part 12 remains a reference glossary to clarify these property-related terms.

This part provides definitions of terms connected to concrete processing and methods, emphasizing practices like density control through proper compaction and testing. The density formula is defined as mass divided by volume, and standard tests such as slump and compaction factor tests are referenced to assess workability and consolidation. Ensuring correct density is critical for achieving required strength and durability, with proper mix design, placement, and compaction validated by recognized testing methods.

IS 6461 Part 12 defines terms commonly used in concrete testing and measurements, including slump, workability, compressive strength, curing, and setting time. It does not provide formulas or detailed test procedures, which are found in other IS standards like IS 516 and IS 1199. This glossary facilitates uniform comprehension of testing terminology to aid consistent interpretation of test results across the construction industry.

This segment explains key thermal and mechanical properties relevant to concrete materials, such as thermal conductivity defined by heat flux over temperature gradient, and thermal diffusivity calculated from conductivity, density, and specific heat. Mechanical properties including density, specific heat, modulus of elasticity, and compressive strength are summarized with typical ranges. These definitions aid understanding of heat transfer and mechanical behavior essential for material selection and structural design.

This section defines curing and setting-related terms, highlighting membrane curing as the application of liquid sealants or protective films to limit water evaporation from fresh concrete, and adiabatic curing as maintaining conditions where no heat is lost to surroundings to accelerate strength development. Materials used for membrane curing include bituminous emulsions, paraffinic emulsions, waxes, and plastic sheets. These definitions help clarify curing practices crucial for proper hydration and durability.

IS 6461 Part 12 describes refractory materials as nonmetallic substances capable of enduring elevated temperatures without melting or deforming. Refractoriness denotes their resistance to softening or shape change under heat. Reactive silica materials like fly ash and pozzolana are also defined due to their chemical interactions at high temperatures. The standard emphasizes selecting refractories with adequate thermal stability and chemical resistance for high-temperature applications.

This part compiles miscellaneous technical terms related to cement concrete technology to standardize language across the field. It includes definitions for phenomena such as bleeding, segregation, and curing, but excludes design formulas or calculation tables. For detailed design parameters, related IS codes like IS 456 and IS 10262 are recommended. This glossary ensures clarity and uniformity in technical communication.