Q: Can you tell me whether modest warming of geogrids (e.g., due to heat generated by the curing of lightweight cellular concrete [LCC]) might impact the long-term strength or long-term modulus of geogrids?
A: You need to know the maximum temperature due to the heat from hydration of the LCC. Most pozzolanic reaction temperatures (like LCC curing) are limited to 160°F (70°C) during hydration, which lasts less than 24 hours. This temperature is well below the glass transition temperature of high-density polyethylene (HDPE), polypropylene (PP), polyvinyl alcohol (PVA) and polyethylene terephthalate (PET). Therefore, one should see few effects on geogrids of heat from LCC curing given this modest temperature increase over a relatively short period of time.