Analog CBR Test Apparatus – Hand & electric Operated, 50 kN Capacity, Proving Ring & Dial Gauge | Soil Strength Testing

Description

Introduction CBR Test Apparatus

The CBR Test Apparatus delivers precise, consistent, and fully controlled California Bearing Ratio testing for laboratory soil strength evaluation in Bangladesh. Unlike hand-operated models where penetration rate depends on operator skill, this motorized apparatus drives the penetration piston into the soil sample at a perfectly constant rate of 1.25 mm per minute throughout the entire test — exactly as ASTM D1883, AASHTO T193, and BS 1377-4 standards require. The twin-column motorized load frame eliminates human variability from the loading process, producing highly repeatable CBR values that earn acceptance in government project documentation, consultant reports, and international certification processes. ASTZ Bangladesh supplies this electric CBR test apparatus to professional soil testing laboratories, university research departments,

 

Specifications –California bearing ratio test set

Parameter	Specification
Test Type	California Bearing Ratio (CBR) – Laboratory
Load Frame Operation	Motorized (electromechanical drive)
Load Frame Capacity	50 kN (5,000 kg)
Frame Type	Twin-column with adjustable upper crossbeam
Penetration Piston Diameter	50 mm
Test Speed (Standard)	1.25 mm/min (constant, motor controlled)
Alternative Test Speed	1.0 mm/min (BS specific, on applicable models)
Rapid Platen Speed	High speed (rapid adjustment mode)
Proving Ring Capacity	50 kN
Penetration Dial Gauge Range	25 mm
Penetration Dial Gauge Resolution	0.01 mm per division
CBR Mould Internal Diameter	150 mm
CBR Mould Height	175 mm
Surcharge Weights	2 × 2.5 kg (1 annular + 1 slotted)
Mounting Type	Bench-top
Power Supply	220V AC, 50 Hz, single phase
Overload Protection	Yes – automatic cutoff
Travel Limit Switches	Yes – upper and lower limits
Stabilizer Bar	Included
Applicable Standards	ASTM D1883, AASHTO T193, BS 1377-4, EN 13286-47, IS 2720 (Part XVI)
Test Conditions	Soaked and un-soaked specimens
CBR Value Determined At	2.5 mm and 5.0 mm penetration

 

Key Features CBR Test Apparatus price in Bangladesh

1. The analog CBR apparatus uses a robust mechanical screw-jack load frame with a 5,000 kg (50 kN) capacity. The handwheel gives operators full manual control over the penetration rate. Furthermore, the two-column frame construction provides rigid structural stability during load application, preventing lateral deflection that could affect test accuracy.
2. The apparatus uses a calibrated proving ring to measure applied load. The proving ring converts force into measurable deflection, which operators read from an attached dial indicator. Each proving ring includes a calibration chart traceable to national standards, ensuring accurate and reliable load readings throughout the instrument’s service life.
3. The penetration dial gauge measures piston depth with a 25mm range and 0.01mm resolution. The tripod-mounted holder positions the gauge accurately above the penetration piston for stable, repeatable readings. Operators record penetration values at standard intervals to construct the full stress-penetration curve.
4. The perforated swell plate sits on the soil surface and tracks upward movement during the 96-hour soaking period. The spacer disc inserts into the mould bottom to position the compacted specimen correctly for standard penetration testing.
5. The apparatus includes one 2.5kg annular surcharge weight and one 2.5kg slotted surcharge weight. These weights simulate overburden pressure from pavement layers above the test specimen. The aluminum metal tripod spans across the mould top and provides a stable, vibration-free platform for swell measurement.
6. The apparatus meets ASTM D1883, AASHTO T193, BS 1377-4, and IS 2720 standards. As a result, field teams use this fully hand-operated instrument at remote construction sites across Bangladesh without requiring any electrical power supply. Soil CBR Testing Set Bangladesh

Application soil CBR testing set Bangladesh 

 

1. Civil engineers and road construction teams use the analog CBR apparatus to determine the bearing capacity of subgrade soils before designing flexible pavement structures. CBR values directly determine required pavement layer thicknesses for roads, highways, and expressways. Bangladesh’s rapidly expanding road network creates strong demand for accurate subgrade CBR testing.
2. Geotechnical laboratories test compacted base and subbase materials using the CBR apparatus to verify that fill materials meet project specifications. Crushed stone, gravel, stabilized soil, and natural laterite samples undergo CBR testing before acceptance for road construction projects.
3. Airport pavement design for runways, taxiways, and aprons requires CBR values to calculate pavement layer requirements under aircraft loading. Furthermore, civil aviation infrastructure projects in Bangladesh use these test results for thickness design in accordance with international aviation standards.
4. Engineers use the CBR apparatus to compare soil values before and after lime, cement, or fly ash stabilization treatment. The improvement in CBR value quantifies stabilization effectiveness and confirms that treated soil meets design strength targets.
5. Construction site engineers use the analog CBR apparatus to assess ground bearing capacity for temporary haul roads, construction platforms, and storage yards. Fast on-site testing guides ground improvement decisions without waiting for laboratory results.

 

Who Uses This California bearing ratio test set

• Civil and geotechnical engineers at construction companies and engineering consultancy firms working on road, highway, and infrastructure projects across Bangladesh
• Roads and Highways Department (RHD) and LGED laboratory staff performing quality control and material acceptance testing for government road projects
• Soil testing laboratory technicians at private geotechnical testing laboratories serving construction and development industries
• University civil engineering professors and students conducting soil mechanics and pavement engineering laboratory courses
• Site engineers and field inspection teams performing in-situ soil strength assessments at remote construction sites without power access
• Geotechnical investigation firms conducting subgrade evaluation during site investigation campaigns for development projects
• Airport and port authority engineering teams designing pavement structures for aviation and maritime infrastructure
• Construction material suppliers verifying CBR compliance of granular base and subbase materials before delivery to road construction sites
• Consultants preparing detailed project reports (DPR) for road and highway construction projects requiring subgrade CBR data

 

 

Frequently Asked Questions CBR test apparatus price in Bangladesh

Q1: What is the CBR test and why does Bangladesh’s construction industry need it? The CBR test measures load-bearing resistance by penetrating a standard 50mm piston into compacted soil at 1.25mm per minute. Engineers express results as a percentage of a standard reference load. Road designers in Bangladesh use CBR values to calculate pavement layer thicknesses under AASHTO and IRC design methods.

Q2: What is the difference between analog and electric CBR apparatus? The analog model uses a hand-operated screw jack that the operator controls manually by turning a handwheel. The electric model uses a motorized drive to maintain a precisely controlled constant penetration rate. Furthermore, the electric model suits accreditation requirements, while the analog model suits field use and locations without power supply.

Q3: Which standards govern CBR testing? ASTM D1883 specifies 1.25mm per minute penetration rate, while BS 1377-4 specifies 1.0mm per minute. Laboratories pursuing NABL or ISO 17025 accreditation use motorized apparatus to demonstrate machine-controlled compliance. The analog apparatus remains widely accepted for routine field and laboratory testing. Motorized CBR Test Machine

Q4: What soil conditions can operators test? Operators test specimens in both un-soaked and soaked conditions. Engineers soak compacted specimens for 96 hours to simulate saturated subgrade conditions during Bangladesh’s monsoon season.

Q5: What accessories does the apparatus include? The complete set includes a CBR mould, base plate, extension collar, cutting collar, spacer disc, penetration piston, proving ring, dial gauges, swell plate, metal tripod, and surcharge weights. Operators perform full CBR testing immediately after delivery without sourcing additional components. Soil CBR Testing Set Bangladesh

Q6: At what penetration depths do engineers determine CBR values? Engineers determine CBR values at 2.5mm and 5.0mm penetration depths. In most cases, the 2.5mm value governs pavement design. Motorized CBR Test Machine

 

Why Buy From ASTZ

1. ASTZ sources all CBR test apparatus through verified manufacturers and authorized supply channels. Every instrument arrives complete with accessories, calibration documentation, and proper packaging. Customers receive apparatus that meets stated standard compliance claims — no inferior substitutes and no incomplete sets. Soil CBR Testing Set Bangladesh
2. The ASTZ technical team understands geotechnical testing requirements across Bangladesh. Staff help customers select the correct model — analog or electric — based on testing volume, project standards, accreditation goals, and budget. Furthermore, after purchase, the team supports installation, proving ring calibration verification, and operator familiarization.
3. ASTZ delivers heavy laboratory testing equipment to customers in Dhaka, Chittagong, Sylhet, Rajshahi, Khulna, Comilla, Mymensingh, Gazipur, and other locations across Bangladesh. The logistics team packages heavy instruments with appropriate protective materials to prevent transit damage and ensure every unit arrives in perfect working condition.
4. ASTZ provides clear, itemized quotations showing base equipment price, accessory inclusions, VAT, and delivery charges before order placement. As a result, customers compare offers with full confidence because ASTZ pricing contains no hidden components.
5. The ASTZ after-sales team provides proving ring calibration services, replacement accessories supply, and technical troubleshooting for CBR apparatus customers. Prompt service response minimizes testing downtime for busy geotechnical laboratories and construction site teams.