Description
1. Introduction
The Manual CBR Device (California Bearing Ratio) is a robust and precise testing instrument designed to evaluate the bearing capacity of soil and subgrade materials used in pavement construction. This versatile device is widely utilized in civil engineering laboratories and field applications to ensure that soil and base layers meet the required strength standards for roads, airfields, and other infrastructure projects.
The device is a critical tool in geotechnical analysis and material testing, providing engineers with reliable data to design safe and durable foundations. Commonly used in transportation, infrastructure development, and construction industries, the Manual CBR Device supports professionals in assessing soil suitability for load-bearing applications.
2. Key Features and Specifications
Technical Specifications:
- Frame Construction: Rigid and corrosion-resistant steel frame for durability and stability.
- Plunger: High-strength plunger with a diameter of 50 mm, designed to apply precise penetration force.
- Loading Mechanism: Manual loading through a geared handle, allowing controlled application of pressure.
- Penetration Dial Gauge: Graduated to 0.01 mm for accurate measurement of soil displacement.
- Load Measurement: Equipped with a calibrated proving ring or load gauge with a range of up to 50 kN.
- Dimensions: Compact design with a footprint of approximately 400 x 400 mm, ideal for laboratory and on-site use.
- Weight: Approximately 20–25 kg for portability without compromising on stability.
Key Features:
- Precision Testing: Delivers highly accurate penetration and load measurements, essential for reliable CBR values.
- Manual Operation: Simplifies testing in environments with limited access to power, making it versatile and portable.
- Durable Materials: Constructed from high-grade materials to withstand heavy use in demanding conditions.
- Ease of Use: Intuitive design ensures smooth operation, even for technicians with minimal training.
- Flexible Testing Capabilities: Compatible with both undisturbed and remolded soil samples.
Performance Enhancements:
- Ensures consistent and repeatable results across various soil types.
- Compact design makes it ideal for both laboratory testing and field applications.
3. Usage and Benefits
Step-by-Step Usage:
- Preparation:
- Prepare the soil sample by compacting it in the mold as per the specified method.
- Mount the prepared sample under the loading plunger of the CBR device.
- Testing:
- Operate the manual handle to apply controlled penetration force through the plunger.
- Record the load and penetration values at specific intervals (e.g., 0.25 mm and 0.5 mm).
- Data Analysis:
- Use the recorded data to calculate the CBR value by comparing the load-penetration curve with standard reference values.
- Result Documentation:
- Compile the results for use in geotechnical analysis and pavement design.
Benefits:
- Accurate Soil Evaluation: Determines the suitability of soil for load-bearing applications, reducing the risk of failure in pavements and foundations.
- Portable and Versatile: The manual design allows for use in remote locations without reliance on power sources.
- Cost-Effective Solution: Provides precise testing capabilities without requiring complex machinery or extensive maintenance.
- Standards Compliance: Delivers results consistent with industry norms for reliable decision-making.
Problem-Solving Capabilities:
- Solves the challenge of assessing soil strength in remote or resource-constrained environments.
- Reduces errors in soil classification with precise and repeatable testing methods.
4. Applicable Standards and Certifications
The Manual CBR Device is manufactured to meet the stringent requirements of international and industry-specific standards, ensuring its reliability and accuracy.
Standards Compliance:
- ASTM D1883: Standard test method for CBR of laboratory-compacted soils.
- AASHTO T193: Standard specification for CBR testing of soils.
- IS: 2720 (Part 16): Indian standard methods for soil strength testing.
Certifications:
- ISO 9001: Certified for quality management systems in design and manufacturing.
- CE Marking: Complies with European safety and quality standards.
5. Maintenance and Durability
Maintenance Requirements:
- Routine Cleaning: Clean the plunger, mold, and frame after each test to prevent residue build-up.
- Calibration: Periodically verify the proving ring or load gauge for accurate load measurement.
- Lubrication: Apply grease to the geared mechanism to ensure smooth manual operation.
Durability Features:
- Constructed with high-quality, corrosion-resistant materials for extended lifespan.
- Designed to withstand the rigors of frequent testing in laboratory and field conditions.
- Mechanically robust to handle heavy loads without deformation or damage.
6. Optional Accessories or Customization
Optional Accessories:
- Mold Sets: Additional molds for preparing samples of varying sizes.
- Penetration Gauge: Upgraded digital dial gauges for enhanced precision.
- Carrying Case: Rugged storage cases for secure transport and protection.
- Spacer Discs: For adjusting the height of the sample during testing.
Customization Options:
- Branded or engraved components for organizational use.
- Proving rings with customized load ranges to suit specific testing requirements.
7. Why Choose Manual CBR Device?
The Manual CBR Device is the ideal choice for civil engineers, geotechnical professionals, and construction teams seeking a reliable, portable, and cost-effective soil testing solution.
Unique Selling Points:
- Precision and Reliability: Ensures accurate and repeatable results, critical for infrastructure safety.
- Ease of Operation: Designed for quick setup and intuitive use, reducing testing time and complexity.
- Portable Design: Enables on-site testing in remote or power-constrained locations.
- Cost-Effective: Offers a professional-grade solution without the need for costly automation.
- Durability: Built to last, even in harsh testing environments.
User Reviews
Insert new Comment