Quickly and easily obtain CBR values with our LWD test services. Light weight deflectometer testing is perfect for data collection in hard-to-reach areas and small spaces. With STS Site Testing Services, you can effortlessly maintain high standards on your construction site or civil engineering project.
What is Light Weight Deflectometer Testing?
Light Weight Deflectometer (LWD) tests are a dynamic plate load test tool used for quality assurance on construction sites, especially for road construction. They are perfect for field use where you need to test dynamic deformation modulus Evd (a material’s level of stiffness) of soil and other granular materials.
This portable device is a smaller version of a falling weight deflectometer, and is a quick and simple method of measuring the load-bearing capacity (deflection) of subgrades, granular layers and backfilling materials. It performs a rapid assessment of compaction quality control and stiffness for situations where traditional methods are impractical.
LWD Test Components
An LWD test is made up of several components, including:
- Load plate: Distributes the impulse load to the surface being tested
- Load cell: Measures the applied load of each impact
- Deflection sensor: Measures the maximum vertical movement
- Drop weight: Typically weighs between 10 and 20 kg and can be raised to a variable height
- Top fix and release mechanism: Holds the falling weight at a constant height
- Guide rod: Allows the falling weight to drop freely
- Lock pin: Has two positions, locked and unlocked, to release the falling weight
- Damping system: Controls the transient pulse length of the impact force
- Steel rings: Transmit the load pulse to the plate
- Data capture system: Captures data
Some LWDs have additional features, like a GPS, printer, rechargeable battery, PC software, voice navigation, and wireless testing.
LWD Test Benefits
Quick Results:
Near-instantaneous test results mean you receive immediate CBR results to take swift action if necessary.
Versatile:
Easily test on various material types, including treated soils, stabilised soils, unbound mixtures, and hydraulically bound mixtures.
Cost-Effective:
No heavy equipment or multiple site visits are required, making it perfect for large areas and edge testing.
High-Precision:
The LWD device measures the deformation, compaction, and bearing capacity of soil so your construction meets quality standards.
Eco Friendly:
Light and portable, the LWD reduces the need for heavy vehicles and minimises environmental impact.
Why STS Site Testing Services?
UK Wide:
We offer LWD testing services nationwide, available at short notice for your urgent needs.
Our Technicians:
With over 20 years of experience, we work to get you precise and reliable results every time.
Detailed Reports:
Get the facts about your site’s bearing capacity and determine percentage compaction so you can make decisions fast.
Used by Professionals:
Construction companies, civil engineers and project managers nationwide trust our services.
FAQs
What is LWD testing for?
LWD testing is best for made ground, recycled materials and aggregates as they are in the elastic stage. It is not as effective for clays, as they have limited elastic properties.
How long does it take to get LWD results?
With Bluetooth data transfer you get results on site. So you can take action if any readings fail to meet your criteria.
Can a LWD test in hard-to-access areas?
Yes, the LWD is light and portable, so it’s perfect for testing in small, hard-to-access areas where traditional methods aren’t practical.
Is LWD cost-effective?
Yes. LWD eliminates the need for heavy reaction loads and multiple site visits, it’s a faster and more affordable solution for large-area testing.
What can I test with LWD?
LWD can test treated soils, stabilised soils, unbound mixtures, hydraulically bound mixtures and cold recycled mixtures with bitumen.
Get Reliable, Efficient LWD Testing Today
Accurate measurement data forms the groundwork for construction projects that stand the test of time. STS Site Testing Services provides fast and accurate results and make decisions with confidence.