chemical resistant mortars, Part I: Silicate type

IS 4832 Part 1 - Scope & Key Specifications for Silicate Type Chemical Resistant Mortars

Scope (Clause 2.0)

• Defines the applicability of the standard for silicate type chemical resistant mortars.
• Covers physical and chemical resistance requirements for sodium and potassium silicate mortars.

Key Physical Requirements (Clause 3.1, Table 1)

Additional Notes

• Lot acceptance requires all tests to meet these criteria (Clause 3.2).
• The standard aligns with ASTM C466-1962T for international consistency.

flowchart TD
    A[Start: Chemical Resistant Mortar Selection] --> B{Type of Mortar}
    B -->|Sodium Silicate| C[Check Physical Properties]
    B -->|Potassium Silicate| D[Check Physical Properties]
    C --> E[Working Time ≥ 15 min]
    C --> F[Flexural Strength ≥ 35 kg/cm²]
    C --> G[Compressive Strength ≥ 100 kg/cm²]
    C --> H[Bond Strength ≥ 5 kg/cm²]
    C --> I[Absorption ≤ 18%]
    D --> J[Working Time ≥ 20 min]
    D --> K[Flexural Strength ≥ 40 kg/cm²]
    D --> L[Compressive Strength ≥ 150 kg/cm²]
    D --> M[Bond Strength ≥ 5 kg/cm²]
    D --> N[Absorption ≤ 18%]

This concise

IS 4832 Part 1 (1969) – Key Definitions & Specifications

Definitions (Clause 2.0 & 3.1)

• Binders:
  Liquid binder is either:

  • Sodium silicate solution with soda-silica molecular ratio 2.5 to 3.5
  • Potassium silicate solution

• Lot Compliance:
  A lot is accepted if all tests meet the specification requirements (Clause 3.2).

Physical Requirements of Silicate Type Chemical Resistant Mortars (Table 1, Clause 3.1)

Notes:

• Strength values are minimum requirements at 7 days.
• Working time refers to the usability window of the mortar before setting.
• Absorption of toluene indicates chemical resistance to organic solvents.

flowchart TD
    A[Binders] --> B[Sodium Silicate (2.5-3.5 ratio)]
    A --> C[Potassium Silicate]
    B & C --> D[Mortar Properties]
    D --> E[Working Time]
    D --> F[Flexural Strength]
    D --> G[Compressive Strength]
    D --> H[Bond Strength]
    D --> I[Absorption of Toluene]

This summary provides the essential definitions and physical property requirements per IS 4832 Part 1 for silicate chemical resistant mortars.

Composition & Specifications of Silicate Type Chemical Resistant Mortars

(IS 4832 Part 1, Ref: IS 4456 Part I - 1967)

Key Notes:

• Mortars are chemically setting silicate types: Sodium Silicate and Potassium Silicate based.
• Strength values are minimum requirements after 7 days curing.
• Absorption of toluene indicates chemical resistance.
• Tests are per IS 4456 (Part I) - 1967.

Typical Composition (General Guide):

• Silicate solution (Sodium or Potassium silicate)
• Fine aggregates (graded sand)
• Additives for workability and chemical resistance

flowchart LR
    A[Silicate Solution] --> B[Mixing]
    C[Fine Aggregates] --> B
    B --> D[Chemical Resistant Mortar]
    D --> E{Properties}
    E --> F[Working Time]
    E --> G[Flexural Strength]
    E --> H[Compressive Strength]
    E --> I[Bond Strength]
    E --> J[Absorption of Toluene]

For detailed mix ratios and additives, refer to IS 4832 Part 1 and IS 4456 Part I tests.

Here are the key physical requirements for Silicate Type Chemical Resistant Mortars as per IS 4832 Part 1, Clause 3.1 and Table 1:

Additional Notes:

• Setting Agent: Fluoride or acid compounds react with silicate binder to form insoluble silica gel (Clause 3.3).
• Lot Acceptance: All test results must meet these criteria for acceptance (Clause 3.2).

This table ensures mortar meets durability and chemical resistance for industrial applications.

flowchart LR
    A[Mortar Sample] --> B[Test Specimens]
    B --> C{Tests per Table 1}
    C --> D[Working Time]
    C --> E[Flexural Strength]
    C --> F[Compressive Strength]
    C --> G[Bond Strength]
    C --> H[Toluene Absorption]
    D & E & F & G & H --> I{Meets Requirements?}
    I -->|Yes| J[Lot Accepted]
    I -->|No| K[Lot Rejected]

IS 4832 Part 1: Chemical Resistance Requirements for Silicate Type Mortars

Key Physical Requirements (Table 1)

Chemical Resistance Limits

• Clause 5.1: Chemical resistance limits are not fixed; they must be mutually agreed between purchaser and supplier.
• Testing is done as per IS 4456 (Part I) - 1967 (Methods for silicate and resin type mortars).

Notes:

• Use IS 4456 (Part I) for detailed chemical resistance test procedures.
• Refer to related standards for other mortar types: IS 4441, IS 4442, IS 4443, IS 4456 (Part II), IS 4832 (Part III).
• Results should be rounded as per IS 2-1960.

This ensures mortar selection and acceptance criteria meet project-specific chemical exposure conditions effectively.

IS 4832 Part 1: Sampling and Criteria for Conformity

Sampling Procedure (Appendix A, Clause 6.1 & A-2.1)

• Select ≥10% of containers from the lot (filler and binder separately).
• From each selected container, take equal quantities.
• Mix filler and binder thoroughly to prepare a representative mortar sample for testing.

Criteria for Conformity (Clause 6.1 & A-3)

• Samples must conform to the requirements specified in the standard.
• Testing is done on the prepared mortar sample from the selected containers.
• Acceptance or rejection of the lot is based on these test results.

Marking (Clause 7.1.1)

• Each package may carry the Standard Mark as per BIS rules.
• The Standard Mark certifies compliance under BIS supervision and ongoing quality control.

Summary Table: Sampling

flowchart TD
    A[Lot of Containers] --> B[Select ≥10% Containers]
    B --> C[Take Equal Quantities from Each]
    C --> D[Mix Filler & Binder]
    D --> E[Prepare Mortar Sample]
    E --> F[Test for Conformity]
    F --> G{Pass?}
    G -->|Yes| H[Accept Lot]
    G -->|No| I[Reject Lot]

This ensures representative sampling and reliable conformity assessment as per IS 4832 Part 1.

IS 4832 Part 1 – Packing and Marking Summary

Packing Requirements (Clause 7.1)

• Silicate solution: Must be packed in sealed airtight containers.
• Dry mix: Properly packaged to prevent deterioration during storage.

Mandatory Marking on Each Package:

• Manufacturer's name
• Date of manufacture / Batch number
• Net volume/weight (solution) or Net weight (dry mix)
• Storage requirements
• Storage life
• Date of expiry

Optional Marking (Clause 7.1.1)

• Standard Mark as per BIS regulations, ensuring compliance with IS standards and quality control.

Sampling (Appendix A, Clause 6.1)

• Sampling and conformity criteria follow the procedure in Appendix A (detailed in IS 4832 Part 1:1969).

Visual Summary

flowchart TD
    A[Packing] --> B[Silicate Solution: Airtight Containers]
    A --> C[Dry Mix: Proper Packaging]
    D[Marking] --> E[Manufacturer Name]
    D --> F[Date of Manufacture/Batch No.]
    D --> G[Net Weight/Volume]
    D --> H[Storage Requirements]
    D --> I[Storage Life]
    D --> J[Date of Expiry]
    D --> K[Standard Mark (Optional)]

This ensures product integrity and traceability per IS 4832 Part 1.

IS 4832 Part 1: Sampling Methods and Conformity Criteria

Sampling Procedure (Clause 6.1 & Appendix A)

• Sample Selection:
  • Select samples from each lot separately.
  • For mortar, select ≥10% of containers of filler and binder each.
  • Take equal quantities from selected containers.
  • Mix filler and binder samples thoroughly to prepare the mortar sample.

Conformity Criteria (Appendix A-3)

• The sample must meet all specified physical and chemical requirements.
• If test results fall within tolerance limits, the lot is accepted.
• Non-conformance leads to rejection or retesting as per the standard.

Marking (Clause 7.1.1)

• Packages may bear the Standard Mark if licensed by BIS.
• This mark certifies compliance with IS 4832 under BIS supervision.
• Continuous surveillance ensures ongoing conformity.

Summary Table: Sampling and Testing

flowchart TD
    Lot[Lot of Containers]
    Sample[Select ≥10% Containers]
    Mix[Mix Equal Quantities]
    Test[Test Sample]
    Decision{Meets Specs?}
    Accept[Accept Lot]
    Reject[Reject or Retest]

    Lot --> Sample --> Mix --> Test --> Decision
    Decision -- Yes --> Accept
    Decision -- No --> Reject

This ensures representative sampling and reliable conformity assessment as per IS 4832 Part 1.

IS 4832 Part 1 - Amendment No. 1 (June 1981) Key Updates

1. Binders Specification (Clause 3.1)

• Liquid binder: Sodium silicate or potassium silicate solution.
• Molecular ratio (SiO₂/Na₂O or SiO₂/K₂O): 3 to 3.7.
• Specific gravity: Approximately 1.4.
• Binder must form chemical resistant mortar with suitable powder (setting agent + filler).

2. Chemical Resistance Guide (Clause 5.1)

• Refer to Table 1 of IS 4441-1980 for chemical resistance of silicate mortars against various substances.
• This table provides a general guide on durability and compatibility with chemicals.

3. Testing & Conformity (Clause 3.3 and A-3.3)

• Samples tested per Table 1 of IS 4832 Part 1.
• If initial sample fails, a second sample from the same lot is tested.
• Failure of second sample leads to rejection of entire lot.

Summary Table: Binder Properties

Reference for Chemical Resistance:

flowchart TD
    A[Mortar Sample] --> B{Test per Table 1}
    B -- Pass --> C[Accept Lot]
    B -- Fail --> D[Prepare 2nd Sample]
    D --> E{Test 2nd Sample}
    E -- Pass --> C
    E -- Fail --> F[Reject Lot]

For detailed chemical resistance, consult IS 4441-1980 Table 1 and for binder formulation, follow the molecular ratio and specific gravity as above.