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CONCRETE: PAD CAPS AND RETAINER RINGS AZA1162
The Azalab Concrete Pad Caps & Retainer Rings Set is engineered to deliver precise, repeatable compressive strength testing for concrete cylinders, fully compliant with ASTM C1231 and AASHTO T22 standards. Designed as a superior alternative to sulfur capping, this system ensures safe, clean, and efficient unbonded capping using neoprene pad inserts.
High-Precision Retainer Rings
Manufactured from plated high-alloy steel, the retainer rings are corrosion-resistant and capable of handling repeated load cycles without deformation. Each ring is precision-machined to a tolerance of ≤ 0.002″, ensuring flat, uniform bearing surfaces for consistent load transfer during testing.
Neoprene Pad Inserts
Durable neoprene pads fit securely within the retainer rings and adapt to minor surface irregularities at the ends of concrete cylinders. The elastomeric material provides uniform stress distribution and high repeatability across all tests. Pads are available in multiple durometers (50, 60, 70) depending on the compressive strength range.
Universal Compatibility
The pad cap system is suitable for standard concrete cylinder sizes used in laboratories and field QA/QC testing, including 4″ × 8″ and 6″ × 12″ specimens. Rings are reusable, and pads are replaceable, providing long-term operational efficiency.
Ideal For
• Concrete testing laboratories
• Field quality control/quality assurance
• Precast and ready-mix production plants
• Research and education institutions
Description
Specifications
| Component | Details |
|---|---|
| Standard Compliance | ASTM C1231 / AASHTO T22 |
| Retainer Ring Material | Plated High-Alloy Steel (Rust- & Fatigue-Resistant) |
| Pad Material | Tough Neoprene Elastomer |
| Pad Durometer Options | 50, 60, 70 (based on load range) |
| Machining Tolerance | ≤ 0.002″ bearing surface flatness |
| Compatibility | 4″ × 8″ and 6″ × 12″ concrete cylinders |
| Package Contents | 2 Retainer Rings + 2 Neoprene Pads |
| Reusability | Rings reusable; pads replaceable |
Frequently Asked Questions (FAQ)
Q1: What is the main advantage over sulfur capping?
Neoprene pad capping is faster, safer, and cleaner. It removes the risk of molten sulfur, reduces preparation time, and improves testing consistency.
Q2: Are the neoprene pads reusable?
Pads typically last 100–200 tests, depending on load range and surface wear.
Q3: Which durometer pad should be selected?
Selection is based on concrete strength. Higher strength concrete requires higher durometer pads as per ASTM C1231 recommendations.
Q4: Will the retainer rings deform or corrode over time?
No. The plated high-alloy steel construction resists corrosion and fatigue, even under frequent loading cycles.
Q5: Do you supply replacement pads?
Yes. Azalab offers replacement neoprene pads in all durometer options.
Related products
CHASE AIR INDICATOR AZA1105
AZA1105 Chase Air Indicator is a compact, lightweight, and highly practical field instrument designed to measure the air content in freshly mixed concrete. It is widely used in construction sites where rapid quality decisions are required and laboratory testing equipment is not readily available.
This device serves as a reliable field alternative to standard air content methods such as ASTM C231 (Pressure Method) and ASTM C173 (Volumetric Method). While it is not intended to replace laboratory-grade instruments, it provides fast, useful guidance that helps engineers and site supervisors maintain proper concrete mix quality.
Air entrainment plays a critical role in concrete durability, especially in regions exposed to freeze–thaw cycles, and contributes significantly to workability and pumpability of concrete. AZA1105 helps ensure that air content remains within the recommended range (typically 4%–7%), reducing the risk of weak or brittle concrete.
The working principle is based on fluid displacement and vacuum pressure balance. A representative mortar sample is collected and placed inside the testing chamber, where a controlled vacuum is applied. The internal pressure difference is translated directly to a calibrated dial gauge showing the approximate air content percentage.
With no electrical components, moving mechanical assemblies, or complex maintenance requirements, the AZA1105 is extremely reliable and built for tough field conditions. Its rugged body and easy-to-read dial make it suitable for continuous daily use in real-world jobsite environments.
CUBE MOULD (METAL) AZA1122
Purpose & Function
This mould supports the preparation of standardized cube specimens that are used in:- Compressive strength testing
- Batch-wise quality control in construction
- Concrete mix design validation
- Research on material performance and durability
CYLINDRICAL MOULD AZA1123
Purpose & Function
The cylindrical mould is used to prepare concrete specimens of standard dimensions, typically:- 150 mm diameter × 300 mm height
- 100 mm diameter × 200 mm height
- Compressive strength tests
- Split tensile strength tests
- Elastic modulus evaluations
- Durability and material behavior studies
INITIAL SURFACE ABSORPTION TEST (ISAT) APPARATUS AZA1108
AZA1108 ISAT Apparatus is a precision-engineered testing instrument designed to measure the Initial Surface Absorption of hardened concrete. This test is essential for evaluating the durability of concrete by determining how quickly water penetrates the surface under controlled conditions. The apparatus is widely used in civil engineering laboratories and quality control departments to assess permeability and long-term performance of concrete structures exposed to moisture.
Built with a high-accuracy capillary tube system, the AZA1108 maintains a constant water head over a defined test area and records the volume of water absorbed over specific time intervals — typically at 10, 30, and 60 minutes. The readings obtained help engineers understand the surface porosity of concrete, which is a critical indicator of resistance against weathering, chloride ingress, corrosion of reinforcement, and environmental deterioration.
Designed in compliance with BS 1881-208, this apparatus ensures reliable, repeatable, and standard-compliant results. Its sturdy, rust-proof construction and easy-to-use configuration make it ideal for both routine testing and advanced durability studies in construction material laboratories.
LABOMIX CONCRETE PAN MIXER AZA1118
The AZA1118 Labomix Concrete Pan Mixer is designed for demanding, high-volume mixing operations in construction laboratories, R&D facilities, and material testing centers. Built for durability and precision, it delivers consistent blends of concrete, mortar, grout, and aggregate mixes while supporting rigorous IS/ASTM test procedures.
Engineered with a high-efficiency gear-driven transmission, it provides stable torque, low maintenance requirements, and excellent mixing uniformity. The unit is available in multiple capacities from 90 litres to 300 litres, enabling users to select suitable volume for their operational needs.
The mixer features exchangeable mixing shovels, a safe-locking automatic discharge system, and large mobility wheels that allow a single operator to handle batching, mixing, and discharging efficiently.
MORTAR PENETROMETER AZA1115
Key Features
- Complies with ASTM C403 Standard
- Used to determine mortar hardening rate
- Spring-loaded stem graduated 0–70 kg (1 kg divisions)
- Includes six interchangeable stainless steel needles
- Measures resistance at 25 mm penetration
- Shanks marked every 5 mm for depth guidance
- Supplied in a polished wooden carrying case
- Suitable for both laboratory and on-site QC
PLASTIC CUBE MOULD AZA1126
TAMPING ROD AZA1119
The AZA1119 Tamping Rod is a precision-engineered tool designed for proper compaction of concrete during laboratory and field testing. Essential for slump tests, cube/cylinder preparation, and unit weight determination, this rod ensures accurate removal of air voids, resulting in reliable and repeatable test outcomes.
Manufactured from hardened high-grade steel or stainless steel, the rod maintains dimensional accuracy, bending resistance, and a corrosion-proof finish. Each unit is polished to a smooth surface and features hemispherical ends to prevent mold damage and ensure uniform rodding action. The AZA1119 conforms to ASTM C143, ASTM C192, ASTM C138, IS 1199, and other major testing standards.
It is available in 16 mm and 25 mm diameters, with standard lengths of 600 mm (optional 450 mm). The rods are suitable for use in construction materials labs, QC departments, R&D centers, and field sampling units.