Load plate compression test: dynamic vs. static

Preparation of dynamic and static load plate compression test for construction project

Soil quality plays a decisive role in the planning and realisation of construction projects. It has a significant influence on the safety and durability of the construction. The Load plate compression test is an established method for testing this essential soil quality. It provides information on whether the substrate can bear the intended loads. There are two main types of load plate load test: dynamic and static. Each method has its specific advantages and areas of application and is carried out according to certain standards.

In the following chapters, we will look at the differences, methods and practical applications of both procedures. We look at the technological aspects involved in carrying out these tests, discuss cost factors and explain how to interpret the standards and values according to DIN 18134. This guide is designed to give you an in-depth understanding of load plate compression testing methods and to help you select the appropriate method for your project.

Dynamic load plate compression test: Fast and efficient

Definition and procedure of the dynamic load plate compression test

The Dynamic load plate compression test is an efficient method for controlling soil compaction. Its relevance extends across various stages of construction, including earthworks, road construction and pipeline construction. Its centrepiece, the dynamic load plate, often referred to as a drop weight device, is used to assess the bearing capacity of the soil - an essential property for the stability of the structures built above them.

In contrast to other methods, this test is characterised by its simple implementation. The sequence of the dynamic loadplate load test is straightforward and practice-orientated. A drop weight, usually weighing around 10 kilograms, is dropped from a certain height, often around 70 centimetres. The impact on the load plate, which lies on the floor, generates an impulse that causes the floor to deform. This deformation is recorded by an acceleration sensor mounted in the centre of the load plate. The measuring computer, which can either be a separate device or an application on a smartphone or tablet, calculates the dynamic deformation modulus Evd from this data. This value is a key indicator of the compaction quality of the soil and is expressed in megapascals (MN/m²).

Cost benefits and time savings

The Time and cost efficiency of the dynamic load plate compression test is particularly remarkable in comparison to its static counterpart. The direct costs incurred by purchasing the equipment are quickly amortised by the independence from external soil experts. Construction companies are able to carry out compaction tests independently and without delays, which speeds up construction progress and shortens the overall construction time.

In addition, the dynamic load plate load test enables measurements to be taken in places that are difficult to access, such as pipe trenches or shafts, which represents significant flexibility in construction practice. The simplicity of carrying out the test and the rapid availability of the results mean that compaction work can be controlled effectively and promptly. This prevents unnecessary delays and reduces the risk of costly rework.

Static load plate compression test: the exact analysis

The methodology of the static load plate compression test

At the static load plate compression teststandardised in accordance with DIN 18134, it is all about precision and depth of detail in the analysis of soil properties. This test measures the deformability and load-bearing capacity of the soil by gradually loading and unloading it using a circular load plate. The data obtained - deformation modulus EV1 for the initial load and EV2 for the reload - provide precise information about the soil properties.

However, the process is more complex than the dynamic method. It requires a counterweight, such as a construction vehicle, and takes considerably longer with a time span of up to 45 minutes. This method is used in particular when the final load-bearing capacity of the soil needs to be checked for fundamental construction projects where accuracy cannot be compromised.

Cost-benefit aspect of the static method

During the Static load plate compression test accurate and reliable data, this level of detail is also reflected in the price. The higher cost is due to the time required, the technical complexity and the need for a counterweight. Nevertheless, for critical construction projects where soil quality plays a central role, investing in this precise test is a worthwhile expense.

Thanks to our expertise, we offer our customers not only a precise analysis, but also comprehensive advice on how the results of the static load plate compression test can be used to ensure the long-term stability and safety of the construction project. We see this service as a long-term investment in the quality and reliability of your projects.

Technology in focus: devices for load plate compression tests

Selecting the right device for load plate compression tests

Choosing the right equipment for a load plate load test is crucial to the success of the soil test. The equipment varies depending on the type of test - static or dynamic - and must meet the specific requirements of the construction project and the soil conditions. Lightweight drop weight equipment is commonly used for dynamic tests, while hydraulic jacks are used for static tests. Key selection criteria are user-friendliness, mobility of the device and the ability to record and process accurate measurement data.

Importance of device technology for precise measurement results

The accuracy of the results of a load plate compression test depends largely on the quality and technology of the device used. Modern devices offer digital interfaces and software-supported analyses that not only increase the accuracy of the measurement results, but also enable efficient data processing and documentation. It is essential that the device technology undergoes regular maintenance and calibration to ensure consistently precise results.

Cost overview: What does a load plate compression test cost?

Cost factors of the load plate compression test

A load plate load test can vary in cost depending on the project. The main cost factors include the type of test (static or dynamic), the equipment, the soil conditions, the number of tests required and the site conditions. Static testing is generally more costly than dynamic testing as it requires specialised equipment and often a counterweight.

Hidden costs and potential savings

In addition to the obvious costs for personnel and equipment, hidden costs can also occur. These include delays in the construction process due to waiting times for results or the need for rework if compaction is insufficient. Potential savings can be made by recognising problems at an early stage, using modern, efficient technology and selecting the right process for the job.

Values and standards: Load plate compression test according to DIN 18134

Important values in the load plate compression test

DIN 18134 specifies the procedures for the load plate load test and defines the values to be determined, such as the deformation modulus EV2 and EV1 as well as the ratio EV2/EV1, which are decisive for assessing the load-bearing capacity and deformability of the soil. These values provide a quantifiable basis for determining the quality of soil compaction and thus the suitability of the subsoil for construction projects.

Compliance with standards for valid test results

Strict compliance with DIN 18134 is crucial to ensure the validity and recognition of the test results. This includes the correct execution of the test with the specified load levels and the accurate recording of settlements. The standard also provides guidance on analysing the results to ensure that the data obtained can be correctly interpreted and appropriate action taken.

Frequently asked questions

Why do you need a load plate compression test?

A load plate load test is used to check the deformability and load-bearing capacity of soils on site. This is often done after excavation of a building pit to determine whether the base of the pit has the required load-bearing capacity, or to check the compaction quality of installed soils or base layers, often as part of building pit acceptance tests.

When to perform a dynamic load plate compression test?

The dynamic load plate load test is carried out during the installation phase in earthworks, road construction and pipeline construction in order to assess the compaction quality of installed layers. It offers the possibility of quickly determining the load-bearing capacity of compacted soils and is particularly economical.

Who carries out the load plate compression test?

Specialist construction companies are authorised to carry out the dynamic load plate load test with their qualified personnel. This enables quick and independent testing of soil compaction. Static load plate load tests, on the other hand, are usually the task of specialised testing laboratories, as they require more extensive knowledge and equipment.

For detailed information and support with load plate compression tests, please visit our Website. Here you will find expertise and services relating to the execution and evaluation of load plate compression tests, both dynamic and static, in order to precisely fulfil the requirements of your project.

How does a plate load test work?

In the static plate load test, the soil is repeatedly loaded and unloaded in stages by a circular load plate. Pressure-settlement lines are determined in order to determine the deformability and load-bearing capacity of the floor under a surface load. The deformation moduli EV1 (initial load) and EV2 (reload) can be derived from these lines.

How often load plate compression test?

It is recommended to carry out several dynamic tests in order to obtain accurate results. Ideally, at least one static load plate compression test should be carried out in addition to dynamic tests in order to calibrate the results.

What does EV1 mean?

EV1 stands for the deformation modulus at the initial load as part of a static plate load test. EV1 is used to assess the compaction work performed by the soil placed and thus provides information about its compaction quality.

What does EV2 mean?

EV2 is the deformation modulus during reloading as part of a static plate load test. It is used to assess the deformability or load-bearing capacity of the floor.

What does EVd mean?

EVd denotes the dynamic deformation modulus, which is determined during the dynamic load plate load test. It provides information about the compaction quality of the soil and is given in MN/m². EVd is used in particular to quickly determine the load-bearing capacity of compacted soils.

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