Hydrophobic Portland cement – Specification

IS 8043: Scope & Key Specifications

• Scope: Covers manufacture, chemical & physical requirements of hydrophobic Portland cement.
• Mass & Packaging: Cement bags nominally 50 kg; mass tolerance per Standards of Weights and Measures (Packaged Commodities) Rules, 1977.
• Sampling: Random sampling per IS 4905:1968.
• Rounding off: Follow IS 2:1960 for numerical values.

Tolerance Requirements for Cement Bags (Annex C)

Referenced IS Standards (Annex A Highlights)

• IS 269:1989: Ordinary Portland Cement specs.
• IS 650:1966: Standard sand for cement testing.
• IS 4031 (Parts 1-13): Physical testing methods for hydraulic cement.
• IS 4905:1968: Random sampling methods.
• IS 11652, 11653: Packaging materials (HDPE, PP sacks).

This ensures compliance with quality, packaging, and testing for hydrophobic Portland cement under IS 8043.

IS 8043: Definitions & Key Specifications Summary

1. Definitions:

• Refer to IS 4845:1968 for standard definitions related to hydraulic cement.
• This standard supplements with additional relevant definitions.

2. Mass of Cement Packed in Bags:

• Must comply with Standards of Weights and Measures (Packaged Commodities) Rules, 1977.
• Tolerance on mass is specified in Annex C of IS 8043.

3. Tolerance Requirements for Mass of Cement Packed in Bags (Annex C):

• Average net mass per bag in a sample should be ≥ 50 kg.
• Bags must be randomly selected as per IS 4905:1968.

4. Referenced Indian Standards:

• IS 269: Ordinary Portland Cement
• IS 650: Standard Sand for Testing Cement
• IS 3535: Sampling Methods for Hydraulic Cement
• IS 4031 (Part 1 to 13): Physical Tests for Hydraulic Cement
• Others related to packaging and slag cement.

Summary Diagram: Sampling & Tolerance Process

flowchart TD
    A[Batch of Cement Bags] --> B[Random Sampling (IS 4905)]
    B --> C[Sample Size Determined by Batch Size]
    C --> D[Check Average Mass ≥ 50 kg]
    D -->|Pass| E[Batch Accepted]
    D -->|Fail| F[Batch Rejected or Reprocessed]

Note: For precise testing methods and definitions, always refer to IS 4845 and related IS codes listed in Annex A.

IS 8043: Hydrophobic Portland Cement — Composition & Manufacture

Key Specifications (Clause 4.1)

• Raw materials: Calcareous + argillaceous + other silica, alumina, or iron oxide-bearing materials.
• Process: Burned at clinkering temperature.
• Grinding: Clinker ground with natural/chemical gypsum.
• Hydrophobic agent: Added in small quantities (up to 0.5% by mass of clinker). Examples:
  • Oleic acid
  • Naphthenic acid
  • Stearic acid
  • Pentachlorophenol

Chemical Requirements (Clause 5.1)

• Follow IS 269:1989 for chemical composition limits of Portland cement.

Packaging & Mass Tolerance (Clause 1.2)

• Cement bag mass and tolerance comply with Standards of Weights and Measures (Packaged Commodities) Rules, 1977.
• Rounding of test results per IS 2:1960.

Summary Table: Hydrophobic Cement Composition

Reference Indian Standards for Cement Manufacture & Testing

flowchart TD
    A[Raw Materials] --> B[Burning at Clinkering Temp]
    B --> C[Clinker]
    C --> D[Grinding with Gypsum]
    D --> E[Add Hydrophobic Agent (≤0.5%)]
    E --> F[Hydrophobic Portland Cement]

Note: For detailed chemical limits and physical tests, refer to IS 269:1989 and IS

IS 8043: Chemical Requirements for Hydrophobic Portland Cement

• Reference Standard: Chemical requirements follow IS 269:1989 (Specification for 33 grade ordinary Portland cement).

• Hydrophobic Agent Content:

  • Up to 0.5% by mass of clinker of hydrophobic agents such as oleic acid, naphthenic acid, stearic acid, pentachlorophenol.

• Chemical Composition Limits (as per IS 269:1989):

• Manufacturing Note:
  Clinker is burnt at clinkering temperature, ground with gypsum and hydrophobic agent to impart water repellency.

• Packing:
  Cement is packed as per IS standards for sacks (HDPE, PP, jute, paper) listed in Annex.

Summary Diagram:

flowchart LR
    Raw_Materials --> Clinker_Production
    Clinker_Production --> Grinding
    Grinding --> Add_Gypsum
    Add_Gypsum --> Add_Hydrophobic_Agent
    Add_Hydrophobic_Agent --> Hydrophobic_Cement
    Hydrophobic_Cement --> Packing

Key Takeaway:
Hydrophobic cement meets chemical specs of IS 269 with added hydrophobic agents ≤ 0.5% clinker mass, ensuring water repellency without compromising cement chemistry.

IS 8043: Physical Requirements for Hydrophobic Portland Cement

Key References:

• Physical requirements (soundness, setting time) as per IS 269:1989 (Ordinary Portland Cement).
• Chemical requirements also refer to IS 269:1989.

Physical Requirements (Clause 6.2)

• Soundness: Cement should not undergo excessive expansion after setting.
• Setting Time: Initial and final setting times must comply with IS 269:
  • Initial setting time ≥ 30 minutes
  • Final setting time ≤ 600 minutes

Compressive Strength (Clause 6.3)

• Follow IS 269 guidelines for 33-grade OPC.
• Typical compressive strength (IS 269):

  Age (days)	Compressive Strength (MPa)
  3	≥ 16
  7	≥ 22
  28	≥ 33

Packaging & Mass Tolerance (Clause 1.2)

• Cement bag mass and tolerance per Standards of Weights and Measures (Packaged Commodities) Rules, 1977.
• Rounding off test results as per IS 2:1960.

Summary Table: Physical Requirements per IS 269:1989

flowchart TD
    A[Hydrophobic Portland Cement] --> B[Physical Requirements]
    B --> C[Soundness (IS 269)]
    B --> D[Setting Time (IS 269)]
    B --> E[Compressive Strength (IS 269)]
    B --> F[Packaging & Mass Tolerance]

For detailed test methods, refer to IS 403 (Part 1 to 13):1988 - Methods of Physical Tests for Hydraulic Cement.

Hydrophobicity Test (Annex B) - IS 8043

B-1 Quantitative Test (Clause 6.6, B-1.1)

• Sample Preparation:

  • Take 5 g each of fresh, free-flowing 33 grade OPC and hydrophobic cement.
  • Spread evenly in a 15 cm diameter Petri dish as a thin layer.

• Conditioning:

  • Expose samples to ≥ 99.9% RH at 27 ± 2°C for 24 hours.

• Test:

  • Determine mass loss on ignition at 550°C for both samples.

• Acceptance Criteria:

  • Hydrophobic cement’s loss on ignition must be ≤ 30% of that of 33 grade OPC.

B-2 Qualitative Test (Floatation)

• Refer to IS 269:1989 for chemical requirements.
• Physical requirements as per Clause 6.

Summary Table

flowchart LR
    A[Take 5g samples] --> B[Spread in 15 cm Petri dish]
    B --> C[Condition at 99.9% RH, 27±2°C for 24 hrs]
    C --> D[Ignite at 550°C]
    D --> E[Measure mass loss]
    E --> F{Loss ≤ 30% of OPC?}
    F -- Yes --> G[Hydrophobic cement accepted]
    F -- No --> H[Rejected]

This ensures hydrophobic cement has significantly reduced moisture adsorption compared to ordinary cement.

IS 8043: Storage, Sampling, Tests, and Rejection of Hydrophobic Cement

1. Storage & Sampling

• Follow IS 269:1989 for storage, sampling, and tests of hydrophobic cement.
• Cement should be stored in dry, moisture-free conditions to maintain hydrophobicity.
• Sampling must be random as per IS 4905:1968 (Methods of random sampling).

2. Tests

• Hydrophobicity test as per Annex B of IS 8043.
• Physical tests follow IS 403 (Part 1 to 13):1988.
• Sampling methods per IS 3535:1986.
• Standard sand for testing cement as per IS 650:1966.

3. Rejection Criteria

• Based on test results from IS 269 and Annex B hydrophobicity test.
• Cement failing hydrophobicity or physical tests should be rejected.

4. Tolerance for Packed Cement Mass (Annex C, Clause 9.2)

• Average net mass per bag ≥ 50 kg.
• Sampling is random per IS 4905.

flowchart TD
    A[Storage of Cement] --> B[Sampling as per IS 4905]
    B --> C[Physical & Hydrophobicity Tests]
    C --> D{Pass?}
    D -->|Yes| E[Accept Cement]
    D -->|No| F[Reject Cement]

Summary: Use IS 269 for handling hydrophobic cement, random sampling per IS 4905, test hydrophobicity (Annex B), and apply batch sampling sizes per Annex C for quality control and rejection decisions.

IS 8043 Manufacturer's Certificate Key Points

• Clause 8.1: Manufacturer must ensure cement conforms to IS 8043 requirements and provide a certificate of conformity within 10 days of dispatch.

• Clause 8.2: Certificate must specify total chloride content (% by mass) of the cement.

• Reference Standards:

  • IS 269:1989 for cement specifications and tests
  • IS 3535:1986 for sampling methods
  • IS 403 (Part 1 to 13):1988 for physical tests

Manufacturer's Certificate Content Summary

Chloride Content Limit (per IS 269:1989)

Summary Flow of Manufacturer's Certificate Process

flowchart LR
  A[Manufacture Cement] --> B[Conduct Tests per IS 269 & IS 403]
  B --> C[Confirm Conformity to IS 8043]
  C --> D[Measure Chloride Content]
  D --> E[Prepare Manufacturer's Certificate]
  E --> F[Dispatch Cement + Certificate within 10 days]

Note: Manufacturer's certificate is vital for traceability and quality assurance, ensuring cement meets durability and safety standards.

IS 8043: Packaging, Marking, and Delivery Key Points

Packaging

• Packing materials must be agreed upon between manufacturer/supplier and purchaser (Clause 9.2.2.3).
• Common packing materials include:
  • HDPE woven sacks (IS 11652:1986)
  • PP woven sacks (IS 11653:1986)
  • Jute sacking bags (IS 2580:1982)
  • Multi-wall paper sacks (valved-sewn) (IS 11761:1986)
  • Lightweight jute union bags (IS 4905:1968)

Marking

• Bags/packages may be marked with the Standard Mark (Clause 9.1.1).
• Marking typically includes:
  • Manufacturer’s name
  • Grade of cement
  • Net weight
  • Batch or lot number
  • ISI mark (if applicable)

Delivery

• Delivery must comply with the relevant standards listed in the annex (Clause 2.1).
• Sampling and physical testing methods for hydraulic cement are referenced (IS 3535, IS 403).
• Delivery packaging must ensure protection from moisture and damage during transport.

Summary Table of Packaging Standards

flowchart TD
    A[Manufacturer] --> B[Packaging Material (agreed)]
    B --> C[Marking (Standard Mark, details)]
    C --> D[Delivery]
    D --> E[Protection during transport]

Note: Refer to respective IS codes for detailed specifications on sack construction and testing.

IS 8043: List of Referenced Indian Standards (Clause 2.1 & Annex)

Key Notes:

• Mass tolerance for cement bags follows Standards of Weights and Measures (Packaged Commodities) Rules, 1977.
• Rounding off test results follows IS 2:1960.
• These standards cover cement specifications, sampling, testing methods, and packaging materials.

This list ensures uniformity and quality control in cement production and packaging.

flowchart LR
    A[IS 8043 Cement Standard] --> B[Chemical & Physical Tests (IS 4030)]
    A --> C[Sampling Methods (IS 3535, IS 4905)]
    A --> D[Packaging Specifications (IS 11652, IS 11653, IS 11761)]
    A --> E[Material Specifications (IS 269, IS 650, IS 12089)]

IS 8043: Hydrophobicity Test Methods for Hydrophobic Cement

B-1 Quantitative Test (Clause B-1.1)

• Sample: 5 g each of fresh 33 grade OPC and hydrophobic cement.
• Procedure: Spread samples thinly in 15 cm diameter Petri dishes.
• Condition: Expose at ≥ 99.9% RH and 27 ± 2℃ for 24 hours.
• Test: Determine mass loss on ignition at 550℃.
• Acceptance:
  [ \text{Loss on ignition of hydrophobic cement} \leq 0.3 \times \text{Loss on ignition of 33 grade OPC} ]

B-2 Qualitative Test (Floatation)

• Hydrophobic cement floats due to hydrophobic agents (e.g., oleic acid, stearic acid).
• Manufactured by mixing calcareous & argillaceous materials, burning at clinker temp, grinding with gypsum and ≤0.5% hydrophobic agent.

Summary Table

flowchart LR
    A[Sample Preparation] --> B[Expose at 99.9% RH, 27±2℃ for 24h]
    B --> C[Ignition at 550℃]
    C --> D{Loss on Ignition}
    D -->|≤ 30% of OPC| E[Accept Hydrophobic Cement]
    D -->|> 30% of OPC| F[Reject Cement]

This ensures hydrophobic cement has significantly lower moisture absorption than ordinary cement.

Tolerance Requirements for Mass of Cement Packed in Bags (IS 8043)

Key Points from IS 8043 Clauses 9.2, 9.2.1, 9.2.2.4 & Annex C:

• Average net mass per bag:

  • Standard: 50 kg minimum (Clause 9.2, Annex C)
  • Alternative: 25 kg (Clause 9.2.1), subject to agreed tolerances.

• Sample Size for Testing (Annex C):

• Tolerance Limits:

  • Maximum 5% of bags in sample may have a minus error > 2% of specified net mass (i.e., > 1 kg for 50 kg bags).
  • No bag should have a minus error exceeding 4% of specified net mass (i.e., no bag < 48 kg for 50 kg bags).

• Average net mass in sample must be ≥ specified net mass (50 kg or 25 kg).

Summary Formula for Tolerance Check:

• Let ( M_s ) = specified net mass (50 kg or 25 kg)
• Minus error limit per bag: ( 0.02 \times M_s ) (2%)
• Maximum allowable minus error for any bag: ( 0.04 \times M_s ) (4%)
• Maximum bags with error > 2%: ( 0.05 \times \text{sample size} )

Practical Implications:

• Check average mass of sample bags ≥ specified mass.
• Count bags with mass < (0.98 \times M_s); must be ≤ 5% of sample.
• No bag mass < (0.96 \times M_s).

flowchart TD
    A[Start Sampling] --> B{Batch Size}
   

IS 8043 - Composition of Technical Committee (Annex D Summary)

The Technical Committee for IS 8043 is a multidisciplinary group representing academia, government, industry, and research organizations, ensuring comprehensive standard development for Hydrophobic Portland Cement.

Key Points:

• Chairman: Dr. H. C. Visvesvaraya (University of Roorkee)
• Members: Experts from cement companies (e.g., Orissa Cement Ltd, The Associated Cement Companies Ltd), government departments (CPWD, Central Water Commission), research institutes (CSIR Structural Engineering Research Centre, Central Building Research Institute), and industry bodies.
• Alternate Members: Each primary member has an alternate for continuity.
• Member Secretary: Director (Civil), Central Board of Irrigation and Power.

Representative Organizations Include:

• Ministry of Railways (Research Designs & Standards Organization)
• National Council for Cement and Building Materials
• Geological Survey of India
• Indian Roads Congress
• BIS (Bureau of Indian Standards) - Director General as Ex-officio Member

Tolerance on Cement Mass (Annex C, Clause 1.2)

• For wagon/truck loads of 20 to 25 tonnes, tolerance on net mass of cement = 0 to +0.5%
• Bag weights for 50 kg cement bags:
  • Jute (IS 2580:1982): 531 g
  • Double bessian bituminized (CRI type): 630 g
  • 6-ply paper: ~400 g
  • Polyethylene lined jute (CRI type): ~480 g

Summary Table: Technical Committee Composition (Excerpt)

This committee structure ensures expert inputs covering technical, research, manufacturing, and regulatory aspects for cement standards.

If