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.
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