IS 13468:1992 specifies the requirements for apparatus used to determine the dry density of soil in situ by the core cutter method. It details the design, materials, dimensions, and marking of the cylindrical core cutter, steel dolly, and steel rammer used primarily for fine-grained natural or compacted soils free from aggregates. This standard is essential for civil and geotechnical engineers conducting soil density tests to ensure accurate and reliable field measurements.
Overview
IS 13468:1992 specifies the requirements for apparatus used to determine the dry density of soil in situ by the core cutter method. It details the design, materials, dimensions, and marking of the cylindrical core cutter, steel dolly, and steel rammer used primarily for fine-grained natural or compacted soils free from aggregates. This standard is essential for civil and geotechnical engineers conducting soil density tests to ensure accurate and reliable field measurements.
Audience
Contents
Structure
IS 13468: Scope - Key Specifications & Tables
Material of construction for equipment parts is specified in Table 1:
| Equipment Part | Material | Special Requirement | Relevant IS Standard |
|---|---|---|---|
| Cutter (seamless steel tube) | Case hardening steel | Tip case hardened to ≥ 40 HRC | IS 4432 : 1988 |
| Dolly (with lip) | Case hardening steel | None | IS 4432 : 1988 |
| Rammer | Steel | None | IS 1875 : 1978 |
| Handic for rammer | Mild steel tube | None | IS 1239 (Part 1) : 1990 |
graph TD
A[Equipment Parts] --> B[Cutter]
A --> C[Dolly]
A --> D[Rammer]
A --> E[Handic]
B --> F[Case hardening steel, Tip ≥ 40 HRC]
C --> G[Case hardening steel]
D --> H[Steel]
E --> I[Mild steel tube]
Use IS 13468 along with referenced IS codes for detailed design, material, and tolerance compliance.
1. References (Clause 2.1):
The following Indian Standards are essential adjuncts:
| IS No. | Title |
|---|---|
| IS 1239 (Part 1): 1990 | Mild steel tubes, tubulars, and fittings |
| IS 1875: 1978 | Carbon steel billets, blooms, slabs, and bars for forgings |
| IS 2102 (Part 1): 1980 | General tolerances for linear and angular dimensions (medium class) |
| IS 4432: 1988 | Specification for case-hardening steels |
2. Materials of Construction (Table 1, Clause 3.1):
| Part | Material | Special Requirement | IS Standard |
|---|---|---|---|
| Cutter (Fig. 1) | Case hardening steel | Tip hardened to min 40 HRC | IS 4432:1988 |
| Dolly (Fig. 2) | Case hardening steel | - | IS 4432:1988 |
| Rammer (Fig. 3) | Steel | - | IS 1875:1978 |
| Handic for Rammer | Mild steel tube | Push fitted or screwed | IS 1239 (Part 1):1990 |
3. Dimensions & Tolerances (Clause 4.1):
4. Marking (Clause 5.1.1):
| Aspect | Details |
|---|---|
| Material Standards | IS 1239, IS 1875, IS 4432 |
| Tolerances | IS 2102 (Part 1):1980 medium class |
| Hardening | Cutter tip min 40 HRC |
| Marking | BIS Standard Mark |
flowchart TD
A[IS 13468 Equipment] --> B[Material Selection]
B --> C[Cutter - Case Hardening Steel (IS 4432)]
B --> D[Dolly - Case Hardening
IS 13468: Materials of Construction - Key Details
| Equipment Part | Material | Special Requirement | Relevant IS Standard |
|---|---|---|---|
| Cutter (seamless steel tube, beveled) | Case hardening steel | Tip case hardened to 40 HRC min | IS 4432 : 1988 |
| Dolly (with lip for cutter fitting) | Case hardening steel | None | IS 4432 : 1988 |
| Rammer | Steel | None | IS 1875 : 1978 |
| Handic for rammer (push fitted/screwed) | Mild steel tube | None | IS 1239 (Part 1) : 1990 |
flowchart TD
A[Equipment Parts] --> B[Cutter: Case hardening steel, 40 HRC tip]
A --> C[Dolly: Case hardening steel]
A --> D[Rammer: Steel]
A --> E[Handic: Mild steel tube]
This ensures durability and compliance with IS 13468 for construction materials.
IS 13468: Dimensions and Tolerances Summary
| Equipment Part | Material | Special Requirement | Relevant IS |
|---|---|---|---|
| Cutter (seamless tube, beylled end) | Case hardening steel | Tip hardened to 40 HRC min | IS 4432:1988 |
| Dolly (steel with lip) | Case hardening steel | - | IS 4432:1988 |
| Rammer | Steel | - | IS 1875:1978 |
| Handic for Rammer | Mild steel tube | - | IS 1239 (Part 1):1990 |
| Nominal Size (mm) | Tolerance (mm) |
|---|---|
| Up to 10 | ±0.1 |
| 10 to 30 | ±0.2 |
| 30 to 100 | ±0.3 |
| 100 to 300 | ±0.5 |
graph TD
A[Equipment Parts] --> B[Cutter]
A --> C[Dolly]
A --> D[Rammer]
A --> E[Handic for Rammer]
B --> F[Case Hardening Steel]
IS 13468 - Marking: Key Specifications
Each equipment must be clearly and indelibly marked with:
| Equipment Part | Material | Special Requirement | Relevant IS |
|---|---|---|---|
| Cutter (seamless steel tube, beyelled end) | Case hardening steel | Tip case hardened to 40 HRC min | IS 4432:1988 |
| Dolly (steel with lip) | Case hardening steel | - | IS 4432:1988 |
| Rammer | Steel | - | IS 1875:1978 |
| Handle for rammer | Mild steel tube | Push fitted or concentrically screwed | IS 1239 (Part I):1990 |
flowchart TD
A[Equipment] --> B[Mark Manufacturer Name/Trademark]
A --> C[Mark Serial Number]
A --> D[Optional: BIS Standard Mark]
D --> E[Assures Quality & Compliance]
For full details, refer to Clause 5 and Table 1 of IS 13468.
Clause 5.1 Requirements:
Clause 5.1.1:
| Equipment Part | Material | Special Requirement | Relevant IS |
|---|---|---|---|
| Cutter (seamless steel tube, beveled end) | Case hardening steel | Tip case hardened to 40 HRC min | IS 4432:1988 |
| Dolly (with lip) | Case hardening steel | - | IS 4432:1988 |
| Rammer | Steel | - | IS 1875:1978 |
| Handle for rammer | Mild steel tube | Push fitted or concentrically screwed | IS 1239 (Part I):1990 |
flowchart TD
A[Equipment] --> B{Marking}
B -->|Manufacturer Name/Trademark| C[Indelible Marking]
B -->|Serial Number| C
B -->|Optional| D[Standard Mark (BIS)]
A --> E[Material of Construction]
E --> F[Cutter - Case Hardening Steel (Tip 40 HRC)]
E --> G[Dolly - Case Hardening Steel]
E --> H[Rammer - Steel]
E --> I[Handle - Mild Steel Tube]
Key takeaway: Ensure indelible marking of manufacturer ID and serial number on equipment; optionally include BIS Standard Mark for quality assurance. Use specified materials per Table 1 with relevant IS standards.
IS 13468: Quality and Certification - Key Points
| Equipment Part | Material | Special Requirement | Relevant IS Standard |
|---|---|---|---|
| Cutter (seamless steel tube) | Case hardening steel | Tip hardened to 40 HRC min | IS 4432 : 1988 |
| Dolly (fitted on cutter) | Case hardening steel | None | IS 4432 : 1988 |
| Rammer | Steel | None | IS 1875 : 1978 |
| Handic for rammer | Mild steel tube | Push fitted or screwed | IS 1239 (Part I) : 1990 |
flowchart TD
A[Manufacturer] --> B[Production under IS 13468]
B --> C[Quality Control & Testing]
C --> D{BIS Inspection}
D -->|Pass| E[Standard Mark License]
D -->|Fail| F[Rectification]
E --> G[Continuous Surveillance by BIS]
This ensures equipment meets durability, safety, and performance criteria as per IS 13468.
IS 13468 Annexures (Figures and Diagrams) Key Points:
| Part | Material | Special Requirement | IS Reference |
|---|---|---|---|
| Cutter (Fig.1) | Case hardening steel | Tip case hardened ≥ 40 HRC | IS 4432 : 1988 |
| Dolly (Fig.2) | Case hardening steel | With lip fitting on cutter | IS 4432 : 1988 |
| Rammer (Fig.3) | Steel | IS 1875 : 1978 | |
| Handic | Mild steel tube | Push fitted or screwed | IS 1239 (Part I):1990 |
graph LR
A[Cutter] --> B[Dolly]
B --> C[Rammer]
C --> D[Handic]
Note: For exact dimensions and detailed diagrams, refer to Figures 1-3 in IS 13468. Use IS 2102 for tolerance values.
Frequently Asked
IS 13468 specifies the apparatus for determining dry density of soil by the core cutter method but does not explicitly mention materials for the core cutter and rammer in the provided clauses.
Based on standard practice and IS 2720 (Part 29):
| Component | Material | Reason |
|---|---|---|
| Core Cutter | Mild Steel/Stainless Steel | Strength, corrosion resistance |
| Rammer | Hardened Steel | Impact resistance |
| Dolly | Hardened Steel | Durability |
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This ensures reliable and repeatable soil density measurements.
Dimensional Tolerances for Apparatus Components (IS 13468)
| Component | Dimension Source | Tolerance Standard |
|---|---|---|
| All apparatus parts | Fig. 1 to Fig. 3 | IS 2102 (Part 1): 1980 (Medium Class) |
| Dimension Range (mm) | Tolerance (mm) |
|---|---|
| Up to 30 | ±0.2 |
| 30 to 120 | ±0.3 |
| 120 to 400 | ±0.5 |
Refer to IS 13468 figures for exact dimensions and IS 2102 for detailed tolerance tables.
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Note: Always verify dimensions against the latest edition of IS 13468 and IS 2102.
According to IS 13468 Clause 5.1:
Each equipment must be clearly and indelibly marked with:
Per Clause 5.1.1, the equipment may also bear the Standard Mark of BIS, indicating compliance with the Indian Standard under BIS supervision.
| Marking Detail | Purpose |
|---|---|
| Manufacturer name/trade-mark | Identifies the producer |
| Serial number | Ensures unique traceability |
| Standard Mark (optional) | Certifies compliance with BIS standards |
This marking ensures traceability, quality assurance, and conformity to IS 13468.
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Note: Markings must be durable and legible throughout the equipment's life.
The core cutter method apparatus as per IS 13468 is suitable for:
| Soil Type | Suitable for Core Cutter Method? |
|---|---|
| Fine-grained soils | Yes |
| Compacted soils | Yes |
| Soils with aggregates | No |
This aligns with IS 2720 (Part 29) for dry density determination by core cutter.
Relationship between IS 13468 and IS 2720 (Part 29):
| Standard | Focus |
|---|---|
| IS 13468 | Apparatus specification for core cutter method |
| IS 2720 Pt 29 | Test procedure for dry density by core cutter |
This ensures compatibility and accuracy in soil density determination by standardizing both the equipment and the method.
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