AZA 1113 U SHAPE BOX APPARATUS

Description

AZA 1113 U SHAPE BOX APPARATUS – Blocking Resistance Test for SCC

The AZA 1113 U Shape Box Apparatus is an essential tool for assessing the blocking resistance of Self-Compacting Concrete (SCC) when it flows through congested reinforcement.This test is widely used in construction material labs, R&D centers, and on-site QC processes. It is especially valuable for structures involving tight rebar spacing, such as columns, precast elements, and dense reinforcement areas. Designed in the shape of a “U”, the apparatus allows the concrete to move from one compartment through steel rebars into another. By measuring how much concrete passes, you can accurately determine if the SCC is prone to segregation or blockage.

This test is widely used in construction material labs, R&D centers, and on-site QC processes. It is especially valuable for structures involving tight rebar spacing, such as columns, precast elements, and dense reinforcement areas.U Shape Box, AZA 1113, SCC blocking test, self-compacting concrete, concrete test apparatus, SCC flow test.U Shape Box AZA 1113 checks blocking resistance of SCC. Ideal for QC labs & sites. Buy SCC test tools online from Azalab – built to global testing standards.

🔍 Key Applications & Features

• Measures SCC blocking tendency when flowing through rebar

• Simulates real-world reinforcement conditions

• Helps identify poor segregation resistance

• Conforms to EFNARC and EN 12350-11 standards

• Widely used in SCC mix design, approval, and quality control

This apparatus is essential for engineers and contractors looking to ensure workability and flow of concrete without manual compaction or segregation – critical in modern automated casting processes.

🧪 How the Test Works

1. The apparatus is filled with freshly mixed SCC in one leg of the U-shape.

2. A gate separating both compartments is opened.

3. Concrete flows horizontally through a section filled with vertical steel rods (simulating rebar).

4. After the flow stops, measure the height of concrete in both legs (H1 and H2).

5. The difference between H1 and H2 helps determine the blocking tendency.

A small difference indicates good passing ability; a large difference means blocking due to coarse aggregate or poor mix viscosity.

🔗 External DoFollow Resources

• EFNARC Guidelines on SCC Testing

• EN 12350-11 – Testing Fresh Concrete: U-Box Test

• The Constructor: U Shape Box Test for SCC

📊 Specifications

❓ Frequently Asked Questions (FAQ)

Q1: What is the purpose of the U Shape Box test?
A: To assess the blocking resistance of SCC as it flows through reinforcement.

Q2: What causes blocking in SCC?
A: Poor mix design, excessive coarse aggregate, or low paste content can lead to blocking.

Q3: What is the acceptable result range for the U Box test?
A: A height difference (H1–H2) of ≤30 mm indicates good passing ability.

Q4: Can it be used with traditional concrete?
A: No, it’s designed exclusively for self-compacting concrete.

Q5: Is it compatible with other SCC tests?
A: Yes, it is often used alongside L Box and V Funnel tests for comprehensive SCC evaluation.

Q6: What causes blocking in SCC?
A: Poor mix design, excessive coarse aggregate, or low paste content can lead to blocking.