Which countries have codes for Rapid Load Testing?

Three countries have adopted official national standards for Rapid Load Testing: Japan, the United States, and the Netherlands. Beyond these national codes, an international standard published by ISO provides a globally recognized framework. The coverage is still narrower than for static or dynamic load testing, which means many projects worldwide operate without a country-specific RLT code. The sections below unpack what each standard requires, how coverage compares to other test methods, and what to do when no local code applies.

Which countries have adopted official RLT standards?

Japan was the first country to formalize Rapid Load Testing in a national standard. The Japanese Geotechnical Society (JGS) published JGS 1815-2002 as part of its 2002 Standards for Vertical Load Tests of Piles, making it the earliest formal RLT code in the world. The United States followed with ASTM D7383, and the Netherlands introduced NEN 7201, most recently updated in 2025. ISO 22477-10:2016 sits above these as an international reference standard.

The Japanese standardization process was methodical. The first Statnamic test in Japan was carried out by Takenaka Corporation in 1991 on an in-situ concrete pile. Comparative tests between Rapid Load Testing and Static Load Testing followed in 1992. A research group was established in 1993 under Professor Osamu Kusakabe of the Tokyo Institute of Technology, with three goals: collecting existing RLT knowledge, investigating the method’s applicability, and developing scientifically grounded interpretation methods. A formal research committee within JGS was set up in 1996 and upgraded to a standardization committee in 1998, ultimately producing the 2002 standard.

In the Netherlands, the current standard is NEN 7201:2025, which replaces NPR 7201:2017+A1:2020. Rapid Load Testing is explicitly included alongside static and other non-static test methods. The Dutch standard distinguishes between different load test classes and specifies when a non-static test can serve as an alternative to a static one.

What do these RLT codes actually require?

Each RLT standard addresses the same core challenge: a Rapid Load Test does not measure static pile response directly. The codes therefore specify how to conduct the test, what to measure, and how to convert the measured rapid response into a statically equivalent capacity. Requirements cover equipment, instrumentation, test preparation, safety, pile integrity, and reporting.

ISO 22477-10:2016 is titled Geotechnical investigation and testing – Testing of geotechnical structures – Part 10: Testing of piles: rapid load testing. It specifies the execution of Rapid Load Tests on foundation piles under axial compressive loading and includes an informative annex on the analysis of results. The standard treats both execution and interpretation as specialist activities.

ASTM D7383-19 distinguishes two execution procedures. Procedure A uses a system in which gas pressure accelerates a reaction mass. Procedure B uses a drop mass combined with a damping or spring system. The ASTM standard explicitly states that both execution and interpretation require specialist knowledge and experience, and it does not treat the maximum measured force as a direct proxy for static capacity.

NEN 7201:2025 covers preparation, measurement setup, execution, reporting, and interpretation for both static and non-static load tests. For Rapid Load Testing specifically, the standard sets additional conditions related to the soil around the pile tip. It also places explicit restrictions on extrapolating an unmeasured failure load from a load-displacement curve when no failure point has been reached during the test.

Across all three codes, a consistent message emerges: Rapid Load Testing is a separate test category, not simply a faster static test or a slower dynamic test. The long force pulse reduces stress-wave problems in the pile and allows a relatively straightforward inertia correction, but rate-dependent soil behavior, pore water pressure, and damping effects must still be addressed through appropriate interpretation methods.

How does RLT code coverage compare to Dynamic Load Testing standards?

Dynamic Load Testing has broader and more mature code coverage than Rapid Load Testing. Standards for dynamic testing exist in a larger number of countries and have been embedded in national design codes for longer. RLT standardization is younger and currently limited to a smaller set of jurisdictions, even though the method itself has been applied internationally for decades.

This gap reflects the history of each method. Dynamic Load Testing based on stress-wave theory was developed and standardized earlier, and its interpretation framework became widely adopted. Rapid Load Testing emerged later as a distinct category, and the research needed to validate interpretation methods for different soil types and pile configurations took time to accumulate. Japan’s early investment in comparative testing between RLT and Static Load Testing was important in building the evidence base that made standardization possible.

For project teams, the practical consequence is straightforward: if your project involves Rapid Load Testing, you are more likely to find a local dynamic testing code than a local RLT code. This does not make RLT less valid as a method, but it does affect how you document compliance and justify the test approach to clients, regulators, or certifying bodies.

What happens when a project is in a country without an RLT code?

When no national RLT standard exists, most projects fall back on ISO 22477-10:2016 as the reference framework, supplemented by ASTM D7383 or NEN 7201:2025 where relevant. Contractual agreements, client specifications, or the engineer of record’s judgment then define which standard governs execution and interpretation.

In practice, this means the testing specialist and the geotechnical engineer of record carry more responsibility for justifying the test setup and interpretation method. The absence of a local code does not remove the need to demonstrate that the test was conducted correctly and that the derived static capacity is reliable. The same two-part check that underpins all RLT standards still applies: first, confirm that the load duration is long enough to limit stress-wave effects in the pile; second, confirm that the method used to convert the measured rapid response to a static-equivalent capacity is appropriate for the specific pile-soil combination.

Comparative testing programs, where RLT results are validated against Static Load Test results on the same site, are one way to build confidence when operating outside a formal code framework. Empirical databases from similar soil conditions and pile types provide additional support.

Is an international ISO standard for RLT in development?

ISO 22477-10:2016 is already published and in active use. It is not in development. It exists and functions as the primary international reference for Rapid Load Testing. The standard was published in 2016 and provides a globally recognized framework that projects in any country can reference, regardless of whether a national RLT code exists locally.

ISO standards are subject to periodic review, so updates or revisions to ISO 22477-10 may occur over time as the body of RLT research and field experience continues to grow. The broader ISO 22477 series covers geotechnical testing of structures and piles more generally, and developments in one part of the series can influence others. For project teams working internationally, monitoring ISO updates is worthwhile, particularly as RLT adoption expands in markets where no national standard currently exists.

How We Support Rapid Load Testing Projects Worldwide

At Allnamics, we have been involved in the development and application of Rapid Load Testing for decades. Our founders contributed directly to the early research that shaped the method, and we continue to apply RLT across a wide range of soil conditions, pile types, and project contexts, onshore and offshore, in countries with formal codes and in those without.

When you bring us in for a Rapid Load Testing project, we provide:

Pre-test prediction and planning – we assess the required drop mass, spring configuration, and drop height to achieve the target load level and load duration, using experience data, theoretical models, and wave-equation analysis
Test execution – using our own StatRapid equipment, a modern RLT system that generates load through a drop mass and modular spring package, without a combustion process
Interpretation and reporting – we apply appropriate analysis methods for your specific pile-soil combination, including inertia correction and rate-dependent soil behavior, and we document results in line with ISO 22477-10, ASTM D7383, NEN 7201:2025, or the standard your project requires
Code navigation – if your project is in a country without a national RLT standard, we help you identify the right reference framework and justify the approach to your client or regulator
Comparative test programs – where needed, we design programs that include both RLT and Static Load Testing to validate results and build confidence in the derived capacity

If you are planning a project that involves Rapid Load Testing and want to understand which standard applies or how to structure the test program, contact our team to discuss your specific situation.