In Situ Testing
In Situ Testing - Related Videos
10:58
Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
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Cited by 9 •
2018
A protocol for the fabrication of electrochemically active LiPON-based solid-state lithium-ion nanobatteries using a focused ion beam is presented.
08:08
Compression Tests on Hardened Concrete
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA There are two distinct stages in a construction project involving concrete. The first stage involves batching, transporting, and casting fresh concrete. At this stage, the material is viscous, and the workability and finishability are the key performance criteria. The second stage occurs when the hydration process begins shortly after the concrete is placed in the form, and the concrete will...
08:00
Whole-Mount In Situ Hybridization
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2023
Whole-mount in situ hybridization (WMISH) is a common technique used for visualizing the location of expressed RNAs in embryos. In this process, synthetically produced RNA probes are first complementarily bound, or "hybridized," to the transcripts of target genes. Immunohistochemistry or fluorescence is then used to detect these RNA hybrids, revealing spatial and temporal patterns of gene expression. Unlike traditional in situ hybridization techniques, which require thin tissue sections whose...
11:23
Tests on Fresh Concrete
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2017
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Concrete consists of two phases, a cement paste phase comprised of cement, water, and air, and an aggregate phase comprised of coarse and fine aggregates. There are two key considerations when designing a concrete mix. First, the concrete must be workable and easy to cast in the forms in its fresh condition, even when the forms are packed with steel reinforcement. In this condition, it is the...
07:53
Bioindication Testing of Stream Environment Suitability for Young Freshwater Pearl Mussels Using In Situ Exposure Methods
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Cited by 3 •
2018
In situ bioindications enable determination of the suitability of an environment for endangered mussel species. We describe two methods based on the juvenile exposure of freshwater pearl mussels in cages to oligotrophic river habitats. Both methods are implemented in variants for open water and hyporheic water environments.
FAQs
The main advantage is that measurements preserve the conditions that influence engineering behavior. Stress state, boundary conditions, and environmental factors at the test location can affect the recorded response, so engineers interpret results as evidence of how the material, ground, or structure performs in place. This makes the data useful for safer designs and more reliable models.
Laboratory results can describe prepared or extracted samples, whereas field measurements capture conditions at the actual site. In situ testing therefore does not automatically replace laboratory work; it provides complementary evidence when sampling may not represent existing stresses, boundaries, or environmental conditions. Combining both perspectives can improve engineering judgments about design, construction, or rehabilitation.
Method selection depends on what engineers need to measure and whether the target is ground, a material, or an existing structure. Load tests examine response under applied loading, penetration tests characterize resistance, pressure measurements assess pressure-related behavior, and sensors or nondestructive examination track conditions in the field. The chosen method shapes the evidence available for engineering interpretation.
Engineers identify the material or structure, the property or performance question, and the field conditions that must be represented. They then choose a suitable load, penetration, pressure, sensor-based, or nondestructive approach and record the resulting measurements. Interpreting those data alongside design or construction needs helps support decisions about verification, maintenance, or rehabilitation.
Field programs may use loading devices, penetration systems, pressure-measurement equipment, monitoring sensors, and nondestructive examination methods. The combination depends on whether engineers are characterizing soil and rock, checking foundations and infrastructure, verifying construction quality, or detecting damage and changes in performance. Each tool supplies a different type of evidence about the engineering condition.
In situ testing is especially valuable when decisions depend on the condition of foundations, infrastructure, soil, or rock as they exist at the site. Engineers apply it during characterization, construction-quality verification, assessment of damage, and evaluation of performance changes. The resulting evidence supports design decisions as well as maintenance and rehabilitation planning.