👉HOLLOW CONCRETE BLOCK (HCB) – CLASS B LABORATORY TESTS
🌟Class B Hollow Concrete Blocks are used for non-load bearing walls or medium-strength construction. To certify quality, the following laboratory tests are performed.
✅ 1. Compressive Strength Test
Standard: ASTM C140
Purpose: To measure block strength.
Typical Requirement for Class B HCB:
Minimum compressive strength: 3.5 MPa to 5.0 MPa (varies with project spec)
Test 3 blocks (average value)
✅ 2. Dimension & Shape Tolerance
Standard: ASTM C140 / ES Standard
Purpose: Check if the block meets size and shape requirements.
Requirements (typical):
Length, width, height within ±3 mm tolerance
Faces should be flat and perpendicular
No large cracks or visible defects
✅ 3. Density Test (Dry Density)
Purpose: Confirm block classification (lightweight, medium, or normal).
Typical values:
1400 – 1700 kg/m³ for Class B HCB
✅ 4. Water Absorption
Standard: ASTM C140
Requirement:
Water absorption ≤ 12–15%
High absorption indicates weak block quality.
✅ 5. Block Weight Measurement
Purpose: Ensure consistency and structural performance.
Values depend on block size (e.g., 150 mm, 200 mm thickness).
✅Optional Tests (if required)
Ultrasound pulse velocity test – for uniformity
Efflorescence test – check salt content
Moisture content
📌 Summary Table for Easy Use
Test Purpose Typical Requirement (Class B)
Compressive Strength Strength ≥ 3.5 – 5.0 MPa
Dimensions Size accuracy ± 3 mm tolerance
Density Quality classification 1400–1700 kg/m³
Water Absorption Durability ≤ 12–15%
Weight Consistency As per design block type
@etconp
🌟Class B Hollow Concrete Blocks are used for non-load bearing walls or medium-strength construction. To certify quality, the following laboratory tests are performed.
✅ 1. Compressive Strength Test
Standard: ASTM C140
Purpose: To measure block strength.
Typical Requirement for Class B HCB:
Minimum compressive strength: 3.5 MPa to 5.0 MPa (varies with project spec)
Test 3 blocks (average value)
✅ 2. Dimension & Shape Tolerance
Standard: ASTM C140 / ES Standard
Purpose: Check if the block meets size and shape requirements.
Requirements (typical):
Length, width, height within ±3 mm tolerance
Faces should be flat and perpendicular
No large cracks or visible defects
✅ 3. Density Test (Dry Density)
Purpose: Confirm block classification (lightweight, medium, or normal).
Typical values:
1400 – 1700 kg/m³ for Class B HCB
✅ 4. Water Absorption
Standard: ASTM C140
Requirement:
Water absorption ≤ 12–15%
High absorption indicates weak block quality.
✅ 5. Block Weight Measurement
Purpose: Ensure consistency and structural performance.
Values depend on block size (e.g., 150 mm, 200 mm thickness).
✅Optional Tests (if required)
Ultrasound pulse velocity test – for uniformity
Efflorescence test – check salt content
Moisture content
📌 Summary Table for Easy Use
Test Purpose Typical Requirement (Class B)
Compressive Strength Strength ≥ 3.5 – 5.0 MPa
Dimensions Size accuracy ± 3 mm tolerance
Density Quality classification 1400–1700 kg/m³
Water Absorption Durability ≤ 12–15%
Weight Consistency As per design block type
@etconp
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