What is the maximum permissible loss on ignition for cinder aggregate?

12 percent by mass, as per Clause 5.1.

What is the grading requirement for cinder as fine aggregate?

The grading must conform to Table 1, with 95-100% passing the 4.75 mm IS Sieve.

Is high sulphur content allowed in cinder aggregate?

No, the total sulphur content (as SO3) must not exceed 1.0 percent by mass (Clause 5.2) to prevent potential unsoundness and corrosion issues.

What is the main purpose of using cinder in lime concrete?

To produce lightweight concrete for non-structural or semi-structural applications where high strength is not a primary requirement.

IS 2686

: 1977

Cinder as Fine Aggregates for use in Lime Concrete

CurrentSpecializedSpecificationMaterials Science · Building Limes and Gypsum Products

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This standard specifies the physical and chemical requirements for cinder to be used as a fine aggregate in lime concrete. It covers aspects like grading, limits on deleterious materials, loss on ignition, and sulphur content to ensure the suitability and durability of the resulting concrete.

Cinder as Fine Aggregates for use in Lime Concrete

Quick Reference Values

Maximum Loss on Ignition12 percent

Maximum Sulphur content as SO31.0 percent

Maximum Clay, Fine Silt, Fine Dust and Organic Impurities5 percent

Maximum Particles retained on 4.75 mm IS Sieve5 percent

Minimum Particles passing 75-micron IS Sieve5 percent

Practical Notes

Cinder quality is highly variable depending on its source; thorough testing as per the standard is essential before use.

Lime concrete with cinder aggregate is a low-strength, lightweight material suitable for non-structural applications like filling, base courses, and masonry blocks.

The high porosity of cinder aggregates can lead to significant water absorption, which must be considered in mix design to control the water-lime ratio.