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  1. jcraig

    Corrosion protection & rehab of PTcables

    Thank you for your response. I have been busy in our labs and not able to respond until now. We have actually been supplying a two-part component polyurethane chemical grout for years in ecapsulated post-tension cable rehab and installations. It appears to provide a more watertight seal...
  2. jcraig

    Corrosion protection & rehab of PTcables

    I am researching the use and specification of polyurethane grouts for corrosion protection and rehabilitation of post-tensioned cables in bridge beams, as well as stay cables. I have the following questions: I am aware of electrochemical (rusting), stress-corrosion cracking and hydrogen...
  3. jcraig

    Buildings with helical piles

    Some good information sites on helical piers I found during my own research recently. Some of these sites have case histories and seismic performance information. http://www.helicaldrilling.com/techlit.asp http://www.piertech.com/our_product.php http://tc17.poly.edu/mp.html --- they have...
  4. jcraig

    chemical grout to enhance helical pier capacity

    Sorry for delays in my responses, it's been a busy week for me and I can only log on sporadically. As I stated in my reply above, I have no project personally. My work is primarily in R&D and the possible application of using chemical grouting to enhance poor soil conditions with helical piers...
  5. jcraig

    chemical grout to enhance helical pier capacity

    Chemical grouting is a method for improving loose or poor soil conditions using a low viscosity grout that is commonly a polyurethane or acrylate material. The low viscosity enables a strengthening mesh to strengthen granular soils or fill voids, greatly improving the site conditions. This...
  6. jcraig

    Hi Modulus Vs Low Modulus definitions

    I am looking for a standard, guideline or specification that delineates the definition of HI-MODULUS versus LOW-MODULUS epoxies and polymers (tension and compression). In other words, are there limitations for these properties, in terms of actual numbers, for a material to be defined as either...
  7. jcraig

    chemical grout to enhance helical pier capacity

    I am looking for information, case studies, papers, design examples, etc. for the use of chemical grouting to enhance the capacity of helical piers. Questions I have: Has the been any case study developments in this application? What are the parameters for the size of the grout ball...
  8. jcraig

    I need a sealant that will cure underwater.

    Polyurethane grout products are used to stop leaks and I have tested these on seawalls, pumping them underwater to seal joints and gushing leaks as well. For fast set, we have our Prime Flex 920 which is a Hydrophobic rigid foam material. We also have a slower set, yet very successful...
  9. jcraig

    I am looking for a standard or spec

    I am looking for a standard or specification that delineates the definition of HI-MODULUS versus LOW-MODULUS epoxies and polymers. I.e., what is the limitations for each to be defined as either a HI-MOD or a LOW-MOD product?

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