The IS 6508:1988 standard presents a detailed glossary of terminology related to building lime, encompassing various lime types, lime-based products, and kiln processes. It provides a vital reference that promotes consistency and precision in the use of lime terminology among construction and civil engineering professionals.
Overview
The IS 6508:1988 standard presents a detailed glossary of terminology related to building lime, encompassing various lime types, lime-based products, and kiln processes. It provides a vital reference that promotes consistency and precision in the use of lime terminology among construction and civil engineering professionals.
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Frequently Asked
IS 6508 categorizes building lime into several types including Fat Lime (non-hydraulic lime with high calcium content that sets by carbonation), Hydraulic Lime (which hardens under water due to the presence of silicates and aluminates), Semi-Hydraulic Lime (possessing intermediate properties), Hydrated Lime (produced through slaking quicklime), and Quicklime (calcium oxide derived from limestone calcination). This classification assists engineers and builders in distinguishing lime types based on their composition and setting mechanisms.
IS 6508 divides the lime kiln into three main zones: the Preheating Zone at the top where raw limestone is heated by hot gases to enhance thermal efficiency; the Calcination Zone in the middle where limestone undergoes thermal decomposition into burnt lime and carbon dioxide at temperatures around 900 to 1100°C; and the Cooling Zone at the bottom where the calcined lime is cooled by incoming air, which simultaneously preheats the combustion air improving fuel efficiency. The kiln shell provides structural support and withstands thermal and mechanical stresses.
The glossary in IS 6508 encompasses various lime products such as Quicklime (burnt lime), Hydrated Lime (slaked quicklime), Hydraulic Lime (lime with hydraulic setting properties), and Lime-Pozzolana Mixtures (blends of lime and pozzolanic materials prepared via intergrinding or powder blending). These terms clarify manufacturing, testing, and usage aspects essential for construction applications.
According to IS 6508, Fat Lime is a pure, non-hydraulic lime containing at least 79% calcium oxide on an ignited basis and it hardens only by carbonation without setting under water. In contrast, Hydraulic Lime contains chemically combined silica, alumina, and iron oxides alongside calcium oxide, enabling it to set and harden both in air and underwater. Hydraulic lime is further categorized into Eminently Hydraulic (strong underwater setting) and Semi-Hydraulic types (intermediate properties).
IS 6508 defines 'Finishing Lime' as a refined hydrated lime used primarily for the smooth finishing coats in plastering, enhancing surface texture. 'Lime Mortar' is described as a mixture of lime, fine aggregate such as sand, water, and optional admixtures, applied in masonry and plaster works to provide workable and durable joints and surfaces.
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