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Thermal Degradation Kinetics of Urea-Formaldehyde Resins Modified by Almond Shells

Kexin Chen1,2, Xue Cheng1,2, Yuzhu Chen1,2

  • 1College of Forestry, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.

ACS Omega
|October 11, 2021
PubMed

Keywords:
urea-formaldehyde resin modificationalmond shell additiveformaldehyde emission controlthermal degradation kinetics

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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
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