Specification for apparatus for use in measurement of length change of hardened cement paste, mortar and concrete

IS 9459: Scope & Key Specifications for Length Change Measurement Apparatus

Scope:

• Covers apparatus for measuring length change of hardened cement paste, mortar, and concrete.
• Applicable for testing drying shrinkage, moisture movement, alkali reactivity, and drying shrinkage of Portland pozzolana cement.
• Ensures reproducible and repeatable results with standardized equipment.

Key Specifications & Materials (Clause 4.1, Table 1)

• All mild steel parts must have anti-corrosive treatment (painting, nitriding, phosphating).
• Dimensions follow nominal sizes with tolerances per IS 2102 (Part 1):1980.

Important Notes:

• Apparatus used for tests as per IS 1199, IS 2386 (Part VII), IS 4031.
• Final test values rounded as per IS 2:1960.
• Yoke end opposite micrometer has an anvil with cylindrical/conical recess.

Summary Diagram of Apparatus Components

graph LR
A[Base: Channel Mild Steel] --> B[Yoke: Threaded Mild Steel]
B --> C[Reference Bar: Hardened Stainless Steel]
B --> D[Micrometer Screw Gauge]
A --> E[Bracket: Mild Steel]
F[Rubber Tube] -.-> B

This standard ensures accuracy and uniformity in length change measurement apparatus for cement and concrete testing.

IS 9459: Apparatus Overview - Key Specifications

Materials for Length Comparator (Clause 4.1, Table 1)

• All non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating).

Dimensional Tolerances (Clause 3.3)

• Use IS 2102 (Part 1):1980 for general tolerances on nominal dimensions unless otherwise specified.

Important Notes:

• The yoke replaces "pillars" terminology.
• Reference bar ends are critical for accuracy: heat-treated, hardened, and polished.
• The apparatus is designed for measuring length changes in hardened cement paste, mortar, and concrete—used in drying shrinkage and moisture movement tests.

Summary Diagram of Apparatus Components

graph LR
    Base --> Yoke(Pillars)
    Yoke --> Bracket
    Bracket --> ReferenceBar
    ReferenceBar --> MicrometerScrew
    RubberTube -.-> Base

This setup ensures precise length change measurement conforming to IS 9459 standards.

IS 9459: Construction & Dimensions Key Points

• Clause 3.3:
  All dimensions are nominal unless specific tolerances are indicated. Tolerances follow general engineering practice.

• Clause 4.1 & Table 1: Materials for Length Comparator

• Special Notes:

  • Non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating) per relevant IS standards.
  • Reference bar ends are hardened and polished for accurate measurement.

• Typical Dimension Notes:

  • Adjustable length comparator includes screw/dial micrometer and reference bar.
  • Yoke end opposite micrometer has an anvil with cylindrical/conical recess for specimen contact.

Summary Diagram of Construction Components

graph LR
  A[Base: Channel Mild Steel] --> B[Pillars: Threaded Mild Steel]
  B --> C[Bracket: Mild Steel]
  C --> D[Reference Bar: Hardened Stainless Steel]
  D --> E[Micrometer Screw Gauge]
  E --> F[Anvil: Cylindrical/Conical Recess]
  G[Rubber Tube] -.-> D

Use this summary for design, material selection, and fabrication of length comparators per IS 9459.

IS 9459: Key Materials Specifications for Length Comparator (Clause 4.1, Table 1)

Additional Notes:

• All non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating) per relevant IS standards.
• Reference bar must be calibrated at a standard temperature with calibration charts.
• Central 100 mm of reference bar covered with 6 mm thick rubber tube for thermal insulation.

Summary Diagram of Material Components:

graph TD
  A[Length Comparator] --> B[Base: Channel Mild Steel]
  A --> C[Pillars (Yoke): Mild Steel, Threaded]
  A --> D[Bracket: Mild Steel]
  A --> E[Reference Bar: Stainless Steel, Heat-treated Ends]
  E --> F[Rubber Tube: Insulation]

This ensures durability, dimensional stability, and accuracy in length change measurements of cement and concrete specimens.

IS 9459 - Marking Specifications Summary

Clause 5.1: Mandatory Marking on Apparatus

• Manufacturer's name or trademark
• Date of manufacture

Clause 5.1.1: Optional Marking

• The product may also bear the Standard Mark (BIS certification mark).

Clause 5.2: Use of Standard Mark

• Governed by the Bureau of Indian Standards Act, 1986.
• Licence conditions for using the Standard Mark are available from BIS.

Key Points on Marking:

Contact for Standard Mark License & Information:

• Bureau of Indian Standards (BIS) Offices across India (Delhi, Mumbai, Kolkata, Chennai, etc.)
• Refer to clause 5.2 for detailed office addresses and contact numbers.

Additional Notes:

• Marking ensures traceability and quality assurance.
• Standard Mark usage is a quality certification symbol, not mandatory but recommended.

flowchart TD
    A[Apparatus] --> B[Mark Manufacturer Name/Trademark]
    A --> C[Mark Date of Manufacture]
    A --> D{Optional}
    D --> E[Standard Mark (BIS)]
    E --> F[License from BIS]

This ensures clear identification and compliance with IS 9459 marking requirements.

IS 9459: Calibration and Accuracy Key Points

Reference Bar (Clause 3.2)

• Material: Stainless steel with thermal expansion ≤ 2 × 10⁻⁶ /°C.
• Dimensions: Diameter 12 mm; length either 300 ± 1.3 mm or 150 ± 1.5 mm.
• Ends: Machined to 6 mm diameter spherical ends or fixed 6 mm balls, heat-treated, hardened, and polished.
• Central 100 mm: Covered with 6 mm thick rubber tube for insulation and handling.
• Calibration: Standardized at a specific temperature with calibration charts for length correction at different temperatures.
• Positioning Mark: Near one end for consistent placement.

Materials for Length Comparator (Table 1, Clause 4.1)

Accuracy & Rounding (Clause 0.5)

• Round off final values per IS:2-1960.
• Maintain the same significant figures as specified values.

Thermal Expansion Correction Formula

[ L_T = L_0 [1 + \alpha (T - T_0)] ]

Where:

• (L_T) = Length at temperature (T)
• (L_0) = Length at standard temperature (T_0)
• (\alpha) = Coefficient of thermal expansion (≤ 2 × 10⁻⁶ /°C)

Summary Diagram: Reference Bar Setup

graph LR
A[Reference Bar] --> B[Stainless Steel, Ø12mm]
A --> C[Length 150 or 300 mm ± tolerance]
A --> D[Ends: 6 mm spherical, hardened & polished]
A --> E[Central 100 mm insulated with 6 mm rubber tube]
A --> F[Calibration charts for temperature correction

IS 9459: Installation and Setup Key Points for Length Change Measurement Apparatus

1. Materials (Clause 4.1, Table 1):

2. Reference Bar (Clause 3.2):

• Stainless steel with thermal expansion ≤ 2×10⁻⁶ /°C.
• Diameter: 20 mm; Length: 150 ±1.5 mm or 300 ±1.3 mm.
• Ends: 6 mm diameter spherical ends, heat-treated and polished.
• Middle 100 mm covered with 6 mm thick rubber tube for insulation.
• Provided with calibration charts for temperature correction.

3. Dimensional Tolerances (Clause 3.3):

• Follow IS 2102 (Part 1): 1980 for general tolerances on linear/angular dimensions.

4. Setup Overview:

• Use a length comparator with a micrometer screw gauge.
• The yoke opposite micrometer end has an anvil with cylindrical/conical recess.
• The apparatus is mounted on a stable base with threaded yoke for fine adjustment.

Typical Setup Diagram (Simplified)

graph LR
A[Base (Channel Mild Steel)] --> B[Yoke (Threaded Mild Steel)]
B --> C[Reference Bar (Stainless Steel)]
C --> D[Micrometer Screw Gauge]
C --> E[Rubber Tube Insulation]

Summary Formula for Thermal Correction of Length

[ L_T = L_0 \times [1 + \alpha (T - T_0)] ]

• (L_T): Length at temperature (T)
• (L_0): Length at standard temperature (T_0)
• (\alpha): Coefficient of thermal expansion (≤ 2×10⁻⁶ /°C)

Note: All mild steel parts must have anticorrosive treatment

IS 9459: Use and Operation - Key Specifications & Materials

Materials for Length Comparator (Clause 4.1, Table 1):

Additional Notes:

• Non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating).
• Dimensions follow IS 2102 (Part 1): 1980 tolerances unless specified otherwise.
• Apparatus is used for measuring length changes (drying shrinkage, moisture movement) in hardened cement paste, mortar, and concrete.

Operation Highlights:

• The yoke end opposite the micrometer has an anvil with a cylindrical/conical recess for proper contact.
• Micrometer screw gauge dimensions and setup must conform to detailed figures in the standard.
• Ensure all components are assembled with correct tolerances and adjustments for accurate length measurement.

Summary Diagram of Components:

graph LR
    A[Base: Channel Mild Steel] --> B[Pillars (Yoke): Mild Steel, Threaded]
    B --> C[Bracket: Mild Steel]
    C --> D[Reference Bar: Stainless Steel, Hardened Ends]
    D --> E[Micrometer Screw Gauge]
    B --> F[Rubber Tube]

For detailed dimensional tolerances and setup, refer to IS 9459 figures and IS 2102 (Part 1).

Maintenance and Care - IS 9459:1980 (Length Change Measurement Apparatus)

Key Specifications:

• Material Protection:

  • All non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating) per relevant IS standards.
  • Reference bar ends: heat-treated, hardened, and polished stainless steel for durability.

• Dimensional Tolerances:

  • Nominal dimensions with tolerances as per IS 2102 (Part 1):1980 for linear/angular dimensions unless otherwise specified.

Maintenance Guidelines:

• Regular Cleaning:

  • Keep the apparatus free from dust and moisture to prevent corrosion and measurement errors.

• Lubrication:

  • Micrometer screws and moving parts should be lightly lubricated to ensure smooth operation.

• Calibration:

  • Periodically verify the reference bar length and micrometer accuracy against certified standards.

• Storage:

  • Store in a dry, dust-free environment to prevent rust and damage.

Table 1: Materials for Length Comparator (Clause 4.1)

Summary Diagram of Maintenance Cycle

graph LR
A[Inspection] --> B[Cleaning]
B --> C[Lubrication]
C --> D[Calibration]
D --> E[Storage]
E --> A

Note: Following these care instructions ensures precision and longevity of the length change measurement apparatus as per IS 9459.

Safety and Handling - IS 9459:1980 (Reaffirmed 2008)

Materials & Corrosion Protection (Clause 4.1 & Notes)

• Base: Channel mild steel (IS: 226-1975)
• Pillars/Yoke: Mild steel (IS: 226-1975), threaded for adjustment
• Bracket: Mild steel (IS: 226-1975)
• Reference bar: Stainless steel, ends heat-treated, hardened, polished
• Rubber tube: Rubber
• All non-working mild steel parts must have anticorrosive treatment (painting, nitriding, phosphating) per relevant IS.

Dimensional Tolerances (Clause 3.3)

• Use nominal dimensions with tolerances as per IS 2102 (Part 1):1980 for linear/angular dimensions unless otherwise specified.

Key Handling Guidelines (Inferred Best Practices)

• Handle reference bars carefully to avoid surface damage (critical for accuracy).
• Ensure threaded parts (pillars/yoke) are adjusted gently to prevent damage.
• Store apparatus in dry, clean environment to prevent corrosion.
• Use protective coatings on mild steel parts to extend apparatus life.

Summary Table: Materials & Special Requirements

flowchart TD
    A[Apparatus Components] --> B(Base: Mild Steel)
    A --> C(Pillars/Yoke: Mild Steel, Threaded)
    A --> D(Bracket: Mild Steel)
    A --> E(Reference Bar: Stainless Steel, Heat-treated)
    A --> F(Rubber Tube)
    B & C & D --> G[Anticorrosive Treatment]
    E --> H[Handle with Care]

For detailed dimension tolerances, refer to IS 2102 (Part 1):1980. Proper handling and corrosion protection ensure measurement accuracy

IS 9459: References and Related Standards Summary

• Clause 3.3: All nominal dimensions should follow tolerances as per IS 2102 (Part 1): 1980 — General tolerances for linear and angular dimensions.

• Related Standards Referenced:

• Materials for Apparatus Components (Table 1):

• Additional Notes:
  • Non-working mild steel parts require anticorrosive treatment (painting, nitriding, phosphating) per relevant IS.
  • Reference bar: Stainless steel, length 150 or 300 mm ± tolerances, with 6 mm diameter spherical ends, heat-treated and polished.
  • Reference bar thermal expansion ≤ 2 × 10⁻⁶ /°C.

Key Formula: Thermal Expansion of Reference Bar

[ \Delta L = L_0 \times \alpha \times \Delta T ]

• ( \Delta L ) = change in length
• ( L_0 ) = original length (150 or 300 mm)
• ( \alpha ) = coefficient of thermal expansion (≤ 2 × 10⁻⁶ /°C)
• ( \Delta

IS 9459: Amendments and Updates Key Points

Amendments Summary:

• Amendment No. 1 (Nov 1984):

  • Clause 3.1: Yoke end opposite micrometer must have an anvil with cylindrical/conical recess.
  • Clause 3.1.1: Replace "frame" by "yoke".
  • Clause 3.2: Replace dimension 20 mm by 12 mm.
  • Fig. 1: Rename "Pillar" to "Yoke".
  • Table 1, Sl. No. (i): Use ISLC 150 or ISMC 150 conforming to IS:226-1975.

• Amendment No. 2 (Apr 1993):

  • Clause 3.3: All unspecified tolerances follow IS 2102 (Part 1): 1980.
  • Table 1: Replace "Pillars" by "Yoke" in Sl. No. (ii).
  • Delete "conforming to relevant Indian Standards" from note.

Material Specifications (Table 1):

• Non-working mild steel parts require anticorrosive treatment (painting, nitriding, phosphating).

Tolerances:

• Follow IS 2102 (Part 1): 1980 for general linear/angular dimensions unless otherwise specified.

Summary Diagram: Apparatus Components

graph LR
A[Base (Channel Mild Steel)] --> B[Yoke (Threaded Mild Steel)]
B --> C[Bracket (Mild Steel)]
C --> D[Reference Bar (Hardened Stainless Steel)]
D --> E[Micrometer End with Anvil]
B --> F[Rubber Tube]

Note: Use the latest amendments for accurate fabrication and compliance.