AZA 0971 LENGTH GAUGE

Description

The Length Gauge is a fundamental testing tool used in construction materials laboratories to determine the elongation index of coarse aggregates. This evaluation is crucial for assessing the shape characteristics of aggregates, which directly impact the strength, durability, and workability of concrete or asphalt mixtures.

Azalab‘s length gauge is precision-engineered to provide consistent and accurate classification of particles. The gauge consists of a rigid metal frame with a series of slots of standard dimensions, corresponding to different aggregate sizes. When aggregates are passed through these slots, only particles classified as elongated (length greater than 1.8 times their mean size) are retained and weighed for analysis.length gauge, aggregate shape test, lab gauge.

Purpose and Importance

Elongated aggregates are undesirable in concrete and road construction because they reduce mechanical strength and compaction quality. The length gauge helps in identifying and minimizing such materials during the aggregate selection process.

Used in conjunction with the thickness gauge, this instrument offers a complete shape index test solution, improving quality control for materials used in highways, bridges, runways, and structural concrete.

The test is conducted according to IS: 2386 (Part 1), which standardizes procedures for determining particle shape using elongation and flakiness indices.

🧪 Applications

• Shape analysis in coarse aggregate testing

• Quality control in construction projects

• Road and highway material inspection

• Ready-mix concrete plant material screening

• Academic and research lab material study

For applicable testing standard, refer to:
IS 2386 Part 1: Methods of Test for Aggregates for Concrete – Particle Size and Shape

 Specifications:

 FAQ:

Q1: What is the elongation index?
The elongation index is the percentage by weight of particles whose greatest dimension is greater than 1.8 times the mean sieve size.

Q2: Why is shape testing important for aggregates?
Shape affects the mechanical interlock in concrete. Elongated and flaky particles reduce strength and workability.

Q3: Can this gauge be used alone?
While it measures elongation, it is often paired with a thickness gauge to fully evaluate particle shape (flakiness and elongation index).

Q4: Is it suitable for field use?
Yes, its portable design and durable frame make it appropriate for both lab and field environments.

Q5: How is the test performed?
Aggregates of known size are passed through the appropriate slots. Elongated particles are separated, weighed, and the elongation index is calculated.