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By Hanskat C.S., Tabat L.M.

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Extra info for Code requirements for environmental engineering concrete structures ACI 350-01 and commentary

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3 — Testing for chemical effects Several recommended tests should be considered prior to and during the construction of environmental concrete structures. 1 — The composition and temperature of the liquid or gas and its pH shall be tested for aggresiveness to the concrete and to the protective barrier system. 1 — Chemical composition and temperature of the liquid or gas including pH determination. 2 — The adequacy of the protection against chemical effects shall be confirmed by tests. 2 — Concentration of dissolved carbon dioxide in the liquid stream.

E) Conduits, sewers, manholes, and junction chambers. (f) Hazardous materials containment structures. 2 — Proportion concrete with the appropriate type of cement; batch, mix, place, consolidate, finish, and cure the concrete to provide a liquid-tight and gastight structure. 2 — Pozzolans such as fly ash and silica fume, when added to the concrete mix, have been found to decrease the concrete’s permeability and increase its resistance to chemical attack. 26 for liquid-tightness requirements. 7.

The code requires the addition of protective coatings or liners in the case of severe exposures such as acids or other chemicals, and exposures to erosion by abrasion and cavitation. Concrete ingredients and proportions should be selected to meet the minimum requirements stated in the code and the additional requirements of the contract documents. Lightweight concrete may be used for environmental structures provided attention is given to durability requirements in general and protection against freezing and thawing, ACI 350 Environmental Structures Code and Commentary 350/350R-40 CHAPTER 4 CODE COMMENTARY abrasion, and sulfate and chemical attack in particular.

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