The 1983 edition of IS 10772 outlines the standards for quick setting lime pozzolana mixtures, offering a cost-effective substitute for cement in various construction uses except reinforced concrete. It details the mixture’s composition, chemical and physical criteria, production methods, and quality assurance processes involving hydrated lime, pozzolanic substances, gypsum, and accelerators.
Overview
The 1983 edition of IS 10772 outlines the standards for quick setting lime pozzolana mixtures, offering a cost-effective substitute for cement in various construction uses except reinforced concrete. It details the mixture’s composition, chemical and physical criteria, production methods, and quality assurance processes involving hydrated lime, pozzolanic substances, gypsum, and accelerators.
Audience
Contents
Structure
This section defines the coverage of quick setting lime-pozzolana mixtures, categorized into Types 1, 2, and 3 based on lime reactivity values of 70, 50, and 30 kgf/cm² respectively. It includes detailed physical requirements such as fineness (maximum 5% residue on 150-micron sieve), initial setting time (minimum 0.5 hours), final setting time (maximum 24 hours), compressive strength benchmarks at 7, 28, and 90 days, water retention minimums, and soundness limits.
This part references IS 6508:1972 for terminology related to building lime and clarifies terms used within the standard to ensure uniform understanding among practitioners.
Describes the production method involving intergrinding hydrated lime, selected pozzolanic materials, gypsum (not exceeding 6% by mass), and accelerators (up to 1% by mass) to achieve the desired chemical and physical properties.
Defines the classification criteria for Types 1, 2, and 3 based on physical attributes and lime reactivity, detailing the minimum compressive strengths and other relevant parameters for each type.
Sets forth the permissible chemical limits including a minimum available lime content of 25%, maximum carbon dioxide content of 2%, magnesium oxide not exceeding 6%, sulfate content capped at 3%, free moisture below 2%, and loss on ignition limited to 20%, referencing relevant IS test methods.
Specifies required physical characteristics such as fineness, setting time, compressive strength at various ages, water retention, and soundness, with test procedures aligned to IS 4031-1968.
Advises on maintaining the mixture in weatherproof storage facilities with easy inspection access, protecting from moisture ingress to preserve quality prior to application.
Details packaging requirements including acceptable bag materials (jute, multi-ply paper, HDPE, cloth), markings for manufacturer and batch identification, net weight tolerances (50 kg ±2.5%), and ensuring bags remain intact upon delivery.
Outlines sampling methods following IS 3535-1966, distinguishing between individual samples for MgO, CO2, and water retention tests and composite samples for other tests, along with conformity assessment criteria.
Describes inspection protocols and testing requirements for chemical and physical properties, emphasizing adherence to established IS methods and the importance of meeting standards for lime reactivity and performance.
Frequently Asked
IS 10772 permits the incorporation of pozzolanic substances such as burnt clay (per IS 1344-1981), fly ash (per IS 3812-1981), rice husk ash, bagasse ash, and calcined clay (per IS 1344-1981). These materials are combined with hydrated Class C lime (per IS 712-1984), Type IV gypsum (per IS 1290-1973), and suitable hardening accelerators to fulfill the specified requirements, ensuring effective rapid setting and strength gain.
According to IS 10772 Clause 5.1, the chemical specifications include a minimum available lime content of 25%, a maximum carbon dioxide content of 2%, and a sulfate content (expressed as SO₃) not exceeding 3%. These limits are established to maintain the mixture’s stability and durability, with testing methods referenced to IS standards such as IS 1514-1959 for lime and IS 6932-1973 for carbon dioxide.
The setting time is controlled by adjusting proportions of hydrated lime, pozzolana, gypsum (up to 6% by mass), and accelerators (up to 1% by mass). Per IS 10772, the initial setting time must be at least 0.5 hours, while the final setting time should not exceed 24 hours. Setting time measurement follows IS 4031 (Part 5): 1988, ensuring a rapid yet controlled hardening process.
The minimum compressive strength requirements for mortar cubes as per IS 10772 are: for Type 1, 2.5 N/mm² at 7 days, 6.0 N/mm² at 28 days, and 8.0 N/mm² at 90 days; for Type 2, 1.0 N/mm² at 7 days, 2.5 N/mm² at 28 days, and 4.0 N/mm² at 90 days; and for Type 3, 0.4 N/mm² at 7 days, 1.0 N/mm² at 28 days, and 1.5 N/mm² at 90 days. These values ensure adequate strength development for various construction requirements.
IS 10772 recommends storing the quick setting lime pozzolana mixture within weather-resistant buildings to protect it from moisture and dampness. The storage area should allow easy access for inspection and identification. Packaging must be intact, using materials such as jute, multi-ply paper, HDPE, or cloth bags clearly marked with manufacturer details, ensuring the product remains stable and uncontaminated prior to application.
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