Capabilities

We provide testing services to certify product and materials compliance, support quality control, and ensure the health and safety of workers and their environment. We provide assistance for clients who are not sure what tests they need. Our accredited materials characterization laboratory is the foundation of all the services of RJ Lee Group provides, including standardized testing for compliance, industrial hygiene and environmental analyses, quality control, and materials research and development.

We provide credentialed expertise supported built by robust scientific data. We provide significant support to industrial clients for product development, industrial hygiene and overall production support.

RJ Lee Group maintains a visible and respected reputation within the legal community, having offered scientific support in civil litigation matters for nearly 30 years. 

  • Product Liability 
  • Toxic Tort
  • Construction Defect
  • Fugitive Emission
  • Personal Injury
  • Patent Infringement
  • Contract Disputes
  • Insurance Subrogation

Subject Matter Experts

From our core business of providing scientific solutions to our clients, we have developed innovative products. Some are produced internally, and some have arisen from partnerships with other research organizations. 

For example, we build lab software solutions to help manage and streamline your labs data, and environmental testing products for a variety of applications. 

  • IntelliSEM is a powerful automated particle analysis system.
  • ParticleID is  a customizable cloud hosted web application used to identify foreign particulate matter and  assist with root cause investigations. 

Other products we create count particles and help keep the air and environment safe.

RJ Lee Group is a materials analysis laboratory and consulting company which serves many different industries. We offer scientific solutions such as industrial forensics services, laboratory and testing services, litigation support, and laboratory software to many industries:

Analyses Reveal Viaduct Concrete Failure Not Consistent

RJ Lee Group News

May 14, 2013

An east coast government agency was concerned about the structural integrity of a viaduct on a main north-south highway that handled approximately 75,000 vehicles a day. The structure, which consisted of a 42-foot wide concrete deck of 40 spans and piers, was built in 1953 and was exhibiting signs of general degradation. The agency had hired a civil engineering construction firm to oversee repairs but had contacted RJ Lee Group to provide information on the current state of the concrete, failure analysis, and an estimation of service life. The prospect of dealing with a structure this large in multiple environments was intimidating but our experts took up the challenge and completed the project, generating a comprehensive report in just two months.

Sample Collection

As an industrial forensics laboratory and consulting firm, one of RJ Lee Group’s strengths is our ability to reach out to external partner firms to supplement our capabilities in providing a total solution. In this case, we were able to rely on a joint venture partner to go on site to perform a visual inspection of the viaduct including the deck, concrete piers and expansion joints. During this time, they took 38 core samples from three different sites – 18 from the concrete deck and 20 from the lateral face of the deck. These concrete and steel samples were sent to the RJ Lee Group laboratory for examination and characterization by our expert analysts. Mechanical tests performed on these samples revealed variability in compressive strengths which suggested internal defects in the concrete.

Sample Characterization

Our petrographers examined the concrete cores and determined that the air-void spacing was higher than the recommended value for frost durability in saturated conditions. Their analysis also revealed that the concrete was affected by alkali-silica reaction (ASR) which had been initiated many years previously and was now in a mature state and not likely to continue. They also noted that samples from parts of the viaduct which had been protected from water penetration by the pavement were not affected by ASR and that chloride contamination was variable from one pier to another.

Service Life Simulation

Our scientists observed very little signs of rebar corrosion in the sound concrete samples and so we collaborated with our partnering firm to conduct service life simulations to evaluate the potential for future corrosion. The service life simulation modeling involved various mechanisms such as moisture transport and time-dependent boundary conditions. Results obtained for each pier estimated the time when corrosion would begin based on the types of concrete covers. Including these mechanisms allowed us to make a reliable prediction of long-term service life to assist engineers in the selection of possible solutions for optimum maintenance and repair of concrete structures, as well as providing support for the use of surface protection systems – such as sealers – as an economical solution.

Conclusions

Analysis of the concrete cores determined that the viaduct deck and pier concrete was affected by the ASR, but that the damage was limited to the damp areas near the joints. Deterioration was most likely increased by freeze-thaw cycles in those areas not adequately protected against frost damage. Cracks found at the pier-deck junction were confined to a small section on each side of the deck and most likely a result of restrained movement. Results demonstrated the benefit of covers and protection systems for concrete exposed to harsh environments providing much needed data to the engineering firm tasked with generating and overseeing repairs.

Related Posts

PTR-MS and Indoor Air Research

PTR-MS and Indoor Air Research

Indoor air quality research continues to grow substantially over the last several years. Most research prior to the 2010’s was focused on outdoor...