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U SHAPE BOX APPARATUS AZA1113
Blocking Resistance Test for Self-Compacting Concrete (SCC)
The AZA1113 U Shape Box Apparatus is a precision-engineered instrument designed to evaluate the blocking resistance of Self-Compacting Concrete (SCC) as it flows through congested reinforcement. This apparatus is widely used in quality control laboratories, construction sites, precast manufacturing units, and research facilities.
Built as per EN 12350-11 and EFNARC guidelines, the U Shape Box test simulates real reinforcement obstacles to help engineers assess SCC’s passing ability, segregation resistance, and suitability for high-density rebar placements.
Key Features
- Measures SCC blocking resistance through simulated rebar congestion
- Accurately indicates flowability and passing ability of SCC mixes
- Robust U-shaped two-chamber design with sliding gate
- Conforms to international SCC testing standards
- Includes precision steel rod arrangement and measuring scale
- Durable, corrosion-resistant construction for field and lab use
- Ideal for SCC mix design, approval, and continuous quality control
Description
How the Test Works
- Fresh SCC is poured into one chamber of the U-shaped apparatus.
- The sliding gate is lifted, allowing SCC to flow horizontally through vertical steel rods.
- After the flow stops, concrete heights in both chambers (H1 and H2) are measured.
- Height difference (H1 – H2) indicates blocking resistance.
- ≤ 30 mm: Good passing ability
- > 30 mm: Indicates blockage or segregation tendency
Applications
- Evaluation of SCC mix suitability for congested reinforcement zones
- Precast concrete manufacturing (beams, columns, walls)
- On-site SCC quality assurance
- R&D and materials testing laboratories
- Complementary testing with L Box, V Funnel, and J Ring tests
Specifications
| Specification | Details |
| Model | AZA1113 |
| Product Type | U Shape Box Apparatus |
| Material | Powder-coated mild steel / Stainless steel |
| Dimensions | Height: 600 mm; Width: 410 mm |
| Rebar Arrangement | 13 mm rods @ 35 mm center-to-center |
| Chambers | Dual compartments with sliding gate |
| Measurement Scale | Included on both chambers |
| Standards Complied | EN 12350-11, EFNARC |
| Application | SCC passing ability and blocking resistance test |
| Accessories Included | U Box unit, gate mechanism, scale, instruction manual |
Frequently Asked Questions (FAQ)
Q1: What does the U Shape Box test evaluate?
It measures the blocking resistance of SCC as it flows through simulated reinforcement.
Q2: What indicates good passing ability?
A height difference of ≤ 30 mm between the two chambers.
Q3: Why does blocking occur?
Due to poor mix design, high coarse aggregate content, inadequate paste volume, or segregation.
Q4: Can traditional concrete be tested?
No. This apparatus is specifically designed for Self-Compacting Concrete.
Q5: Where is the test commonly used?
QC labs, construction sites, precast plants, and material development centers
Additional information
| Model |
AZA 1113 |
|---|---|
| Product Type |
U Shape Box Apparatus |
| Material |
Powder-coated mild steel or stainless steel |
| Dimensions |
Height: 600 mm; Width: 410 mm |
| Application |
SCC flowability and blocking resistance |
| Accessories Included |
Complete U Box, sliding gate, scale, manual |
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