Road building and civil engineering

Many thousands of users already value the measuring devices developed and produced completely in-house by ZORN INSTRUMENTS as precise tools for quality assurance on road building and civil engineering sites in more than 80 countries of the world.

In the ZORN INSTRUMENTS range, test laboratories, road construction authorities and construction companies all find suitable solutions for testing compacted soil materials or for quality tests while laying asphalt.

The Lightweight Deflectometer ZFG launched by ZORN INSTRUMENTS at the start of the 1990s is already a classic in road building and civil engineering. Using this smart instrument, the user can check the load-bearing capacity of the existing subsoil, the complete road subbase, as well as base courses without binding agent in road surface construction.

ZFG - Lightweight Deflectometer

The Lightweight Deflectometer ZORN ZFG for undertaking the so-called "dynamic plate load test" is setting standards in the area of compaction testing and assessment of the load-bearing capacity of non-cohesive soils. The usage of the now some 11,000 ZORN ZFG in different series (as of 2019) is covered by recognised standards worldwide, such as TP BF-StB, Part B 8.3 or ASTM-E 2835-11.

To the Falling Weight Deflectometer

Along with conventional gravel, sand, ballast or chippings, it is also possible to test recycled construction materials as well as material mixtures using a ZORN ZFG. The reliable test results enable the user to make immediate decisions about construction progress; e.g. continuing or ending prematurely the compaction, initiation of measures for soil improvement or material replacement.

The ZORN ZFG is based on complex scientific principles and provides exact data. Despite its basis on complex scientific principles, it is extremely easy for the user to operate. Construction companies therefore like to use it for their own monitoring of the quality of the construction.

According to the current German road construction standard ZTV E-StB 17, quality tests with the Lightweight Deflectometer are accepted by the client as the sole inspection test.

It is possible to use the Lightweight Deflectometer in parallel with construction site operations. Also, unlike other methods, tests using the Lightweight Deflectometer do not require any additional equipment (e.g. impact tools or a heavy vehicle as counterweight). This situation helps the user to achieve more efficient construction site processes and reduces the costs for quality assurance to a necessary minimum.

Click here to go back to the ZORN AT and to the Lightweight Deflectometer ZFG.