The phrase "aggressive substances" is correct and usable in written English.
It can be used in contexts discussing chemicals, drugs, or materials that have strong or harmful effects.
Example: "The laboratory must handle aggressive substances with extreme caution to ensure the safety of all personnel."
Alternatives: "potent substances" or "hazardous materials".
Permeability is a fundamental material property for characterizing concrete durability because it determines the penetration of aggressive substances responsible for degradation under a pressure gradient.
Even with tight widths, however, crack formation is a critical problem that reduces the mechanical performance of structures and accelerates the ingress of water and aggressive substances.
The inner plastic tube, highly resistant against incrustation and aggressive substances provides a sealing function and transports the medium; the outer coating of the concrete tube resists both inner and outer pressure.
The process industries never stay still for very long, and keeping up with the demands of a market that has to handle ever increasing temperatures and more aggressive substances pumped under higher pressure is far from easy.
Water permeability is a durability indicator, for it quantifies concrete resistance to penetration by external agents, due to that water is one of the main carriers of aggressive substances.
TPCC aims at piers exposed to the tidal zone or the air earth zone in marine and saline environments, and protects them from salt damages due to isolate them from the aggressive substances and to eliminate the zones of the concrete structure.
From durability point of view, concrete cover quality plays significant role in blocking of aggressive substance ingress such as chloride ions into the reinforced concrete (Thomas 1991; Bonavetti et al. 2000).
A wet curing extension decreases difference between initial and long-term diffusion coefficients due to improvement of concrete cover quality and blocking the ingress of aggressive substance in initial ages.
Based on the test results, the major conclusions of this study could be summarized as follows: A wet curing extension decreases difference between initial and long-term diffusion coefficients due to improvement of concrete cover quality and blocking the ingress of aggressive substance in initial ages.
Second, the thick compounds in oils can actually fill the gaps between cuticle cells, so applying it to hair can actually prevent aggressive chemical substances from penetrating follicles and therefore improve overall hair health.
PTSD, depression, quality of life, aggressive behavior, and substance use were assessed with self-report questionnaires at intake, four months, and 12 months.
