lime-pozzolana mixture

IS 4098: Scope Overview

• Scope Definition: IS 4098 specifies requirements related to materials and testing methods for a particular construction product or process (refer to IS 6508-1972 and IS 4305-1972 for related definitions).

• Conformity Criteria:

  • As per Clause 5.1 (Table B.5), any sample failing to meet the standard requirements is deemed non-conforming.

• Reference Standards:

  • IS 6508-1972
  • IS 4305-1972
  • IS 4031 (Part 7): 1988 (replacing IS 4031:1968 for testing methods)

Key Points:

Summary Diagram - Scope & Conformity Flow

flowchart TD
    A[Start: Material Sample] --> B{Meets IS 4098 Requirements?}
    B -- Yes --> C[Sample Conforms]
    B -- No --> D[Sample Non-Conforming]
    C --> E[Approved for Use]
    D --> F[Rejected]

For detailed formulas or tables, refer directly to IS 4098 Appendix B and referenced IS codes.

IS 4098: Definitions - Key Points & References

• Clause 2.0: Definitions in IS 4098 supplement those in:

  • IS 6508-1972: Definitions related to concrete admixtures.
  • IS 4305-1972: Definitions for chemical admixtures.

• Clause 9.1 (Appendix B): Additional clarifications and criteria for conformity testing.

• Table 2 (Page 6): Updates references to testing standards, e.g., replacing IS 4031:1968 with IS 4031 (Part 7):1988 for specific tests.

• Clause 5.1 (Table B.5): Criteria for conformity:

  • Any sample failing the specified requirements is non-conforming.

Important Notes:

• IS 4098 primarily defines terms related to chemical admixtures for concrete.
• Testing and conformity criteria refer to IS 4031 (Part 7):1988 for chemical analysis.
• For detailed definitions, refer to IS 6508 and IS 4305 as foundational documents.

Summary Table: Reference Standards for Definitions & Testing

If you need specific formulas or detailed definitions, please specify the admixture or property concerned.

IS 4098 - Materials and Manufacture: Key Specifications

1. Chemical Requirements (Table 1, Clause 5.1)

2. Physical Requirements (Table 2, Clause 6.1)

Notes:

• Lime-pozzolana mixtures must conform strictly to these chemical and physical criteria for conformity.
• Mortar cubes for compressive strength are 50 mm, mixed 1 part lime-pozzolana to 3 parts standard sand by weight.
• Refer to IS 4031 (Part 7):1988 for updated compressive strength test methods.

IS 4098: Types & Specifications of Lime-Pozzolana Mixture

Types of Lime-Pozzolana Mixtures (Clause 4.1)

Chemical Requirements (Table 1, Clause 5.1)

Physical Requirements (Table 2, Clause 6.1)

Notes:

• Lime-pozzolana mixture is made by intergrinding Class C hydrated lime and pozzolana (burnt clay or fly ash).
• Up to 5% Type IV gypsum may be added to improve setting and strength.
• Pozzolana reactivity (IS 1727) must be ≥ 4 N/mm

IS 4098: Chemical Requirements for Lime-Pozzolana Mixtures

Key Chemical Requirements (Table 1, Clause 5.1)

Notes:

• Free lime ensures hydraulic activity.
• Carbon dioxide content affects setting behavior.
• Limits on sulphate and magnesium oxide prevent durability issues.

Types of Lime-Pozzolana Mixtures (Clause 4.1)

References:

• IS 1514: Methods for quick lime and hydrated lime.
• IS 6932 (Part II): CO2 determination.
• IS 1727: Chemical analysis of building lime.
• Appendix A: Moisture content test method.

This chemical specification ensures lime-pozzolana mixtures have controlled hydration, durability, and performance suitable for masonry and concrete applications.

IS 4098 - Physical Requirements for Lime-Pozzolana Mixtures (Clause 6.1, Table 2)

Notes:

• Mortar cubes are prepared with 1 part lime-pozzolana mixture and 3 parts standard sand by weight.
• Fineness controls particle size for reactivity.
• Setting time ensures workability.
• Compressive strength values indicate durability.
• Water retention affects adhesion and curing.
• Soundness limits expansion to prevent cracking.

flowchart LR
    A[Lime-Pozzolana Mixture] --> B[Fineness Test]
    A --> C[Setting Time Test]
    A --> D[Compressive Strength Test]
    A --> E[Water Retention Test]
    A --> F[Soundness Test]
    B --> G{≤ 15% retained}
    C --> H{Initial ≥ 2 hrs, Final ≤ 24-48 hrs}
    D -->

IS 4098: Storage and Handling of Lime-Pozzolana Mixture

Key Specifications & Procedures

• Sampling from Conveyor or Bulk Storage (Clause 3.1.2.1 & B-3.1.2.1):

  • Take ≥ 2.5 kg sample per 15 bags or 50 tonnes passing conveyor.
  • Use scoops or automatic samplers at regular intervals.

• Sampling from Bulk Storage by Tubes (Clause 3.1.2.2 & B-3.1.2.2):

  • For mixture depth ≤ 3 m, insert vertical tubes to full depth.
  • Samples must be from well-distributed points over storage area.

• Sample Preparation (Clause 3.1.2 & B-3.1.2):

  • Mix small increments rapidly in a draft-free place.
  • Store in airtight containers of 7 kg capacity.
  • For disputes, fill two containers: one for lab, one as reference.

• Storage Conditions (Clause 7.1):

  • Store in weather-tight buildings.
  • Ensure easy access for inspection and identification.
  • Protect from dampness to minimize deterioration.

Summary Table for Sampling

flowchart TD
    A[Bulk Storage] --> B[Sample by Tubes]
    B --> C[Vertical insertion up to 3m depth]
    A --> D[Sample by Conveyor]
    D --> E[Sample ≥ 2.5 kg per 15 bags/50 tonnes]
    C & E --> F[Mix increments rapidly]
    F --> G[Store in airtight 7 kg containers]
    G --> H[Lab testing / Reference sample]

This ensures representative sampling and proper storage to maintain mixture quality per IS 4098.

IS 4098 - Marking and Packaging (Clauses 8.1.1 & 8.2)

• Marking Requirements:

  • Bags/packages may bear the ISI Certification Mark, indicating compliance with IS 4098 under ISI supervision.
  • Marking assures quality control, inspection, and continuous conformity checks by ISI.
  • Similar marking info must be provided in delivery advice during bulk supply (Clause 8.1.1).

• Packaging:

  • Packaging should protect the material during transit and storage.
  • No explicit packaging dimensions/formulas in IS 4098; follow general good practice ensuring safe handling.

• Quality Assurance:

  • Any sample failing requirements is non-conforming (Clause 5.1 Table B-5.1).

Summary Table for Marking

Important Note:

Use of ISI mark is governed by the Indian Standards Institution (Certification Marks) Act. Licensing details can be obtained from BIS offices.

flowchart TD
    A[Packaging] --> B[Marking on Bags/Packages]
    B --> C{ISI Certification Mark?}
    C -->|Yes| D[Quality Assurance & Inspection]
    C -->|No| E[Standard Marking Only]
    D --> F[Continuous ISI Conformity Checks]

For detailed packaging specs, refer to IS 4031 (Part 7) for related testing standards.

IS 4098: Sampling Key Points

Sample Size (Clause B-2.1)

• Minimum weight per sample: 2 kg
• Individual test samples (for all tests): ≥ 5 kg

Sampling Procedure (Clause B-3.1.2)

• From large quantities:
  • Use methods in B-3.1.2.1 & B-3.1.2.2
  • Collect small increments rapidly mixed in a draft-free place
  • Store in airtight containers of 7 kg capacity
  • For disputes, fill at least two containers:
    • One for approved lab
    • One as supplier's reference

Sampling from Conveyor or Bulk Storage (Clause B-3.1.2.1)

• Take ≥ 2.5 kg sample from:
  • every 15 bags, or
  • every 50 tonnes (or parts thereof) passing over conveyor or discharge openings
• Use scoops or automatic samplers at regular intervals

Summary Table

flowchart LR
    A[Large Quantity] --> B[Take small increments]
    B --> C[Mix rapidly in draft-free place]
    C --> D[Store in airtight 7kg containers]
    D --> E{Dispute?}
    E -- Yes --> F[Fill two containers]
    F --> G[Send one to lab]
    F --> H[Supplier keeps one]

This ensures representative, standardized sampling for quality testing as per IS 4098.

IS 4098: Testing Methods - Key Specifications & Tables

Sampling & Conformity

• Clause 9.1 & Appendix B: Sampling procedure and conformity criteria are specified.
• Clause 5.1 (Table B.5): Any sample failing test requirements is non-conforming.

Physical Requirements (Clause 6.1, Table 2)

Method for Free Moisture Content

• Refer Appendix A, Table 1 (Item i).

Notes:

• Mortar cubes: 50 mm size, lime-pozzolana : standard sand = 1:3 by weight.
• Water retention test: flow after suction as % of original flow.
• IS 4031 (Part 7): 1988 supersedes IS 4031:1968 for compressive strength tests.

IS 4098: Criteria for Conformity - Key Points

Clause 5.1:

• Any sample failing to meet any specified requirement is non-conforming.

Clause 4.1:

• Samples must undergo all tests prescribed in Clauses 5 and 6.

Clause 9.1 & Appendix B:

• Sampling procedure and conformity criteria are detailed in Appendix B (not fully provided here).

Summary Table (Based on Clause 5.1 and related references)

Notes:

• For free moisture content, refer to Appendix A, Table 1.
• For specific test methods, refer to IS 4031 (Part 7): 1988 for consistency in testing procedures.
• Non-conformity means rejection or further action as per quality control protocols.

flowchart TD
    A[Sample Collection] --> B[Conduct Tests (Clauses 5 & 6)]
    B --> C{Pass All Tests?}
    C -->|Yes| D[Conforming Sample]
    C -->|No| E[Non-Conforming Sample]
    E --> F[Reject or Re-test]

For detailed sampling and acceptance criteria, consult Appendix B of IS 4098.

IS 4098: Method of Test for Free Moisture Content (Lime-Pozzolana Mixture)

Key Formula (Clause A-2.1)

[ \text{Free Moisture Content, %} = \frac{A}{B} \times 100 ]

• A = Loss of mass after drying (g)
• B = Original mass of sample taken (g)

Test Procedure (Appendix A)

• Weigh a sample of lime-pozzolana mixture.
• Dry in an oven at 105° to 110°C until constant mass is achieved.
• Calculate moisture content using the formula above.

Chemical Requirements (Clause 5.1, Table 1)

Summary

• Dry sample at 105-110°C to constant weight.
• Calculate moisture loss percentage.
• Max free moisture allowed: 5% for lime-pozzolana mixture.

flowchart TD
    A[Weigh Sample] --> B[Dry at 105-110°C]
    B --> C[Weigh Dried Sample]
    C --> D[Calculate Moisture Content: (Loss / Original) x 100]
    D --> E{Moisture ≤ 5%?}
    E -->|Yes| F[Sample Acceptable]
    E -->|No| G[Sample Rejected]

This ensures quality control per IS 4098.

IS 4098: Sampling Procedure & Conformity Criteria

Sampling Procedure (Clause 4.1 & Appendix B):

• Samples shall be taken by purchaser or authorized representative.
• Sample size and method as per Appendix B (details not fully provided here).
• All tests prescribed in Clauses 5 and 6 must be performed on the sample(s).

Criteria for Conformity (Clause 5.1):

• Any sample failing any test requirement is non-conforming.
• The standard mandates strict compliance with all test parameters.

Summary Table: Conformity Criteria (Clause 5.1)

Key Points:

• Sampling must be representative and adequate in size.
• Testing covers all relevant parameters (physical, chemical).
• Failure in any test = rejection of the batch.

flowchart TD
    A[Sample Collection] --> B[Perform Tests (Clause 5 & 6)]
    B --> C{Test Results}
    C -->|Pass All| D[Conforming]
    C -->|Fail Any| E[Non-Conforming]

For exact sample sizes and detailed procedures, refer to Appendix B of IS 4098.