HKIE Professional Assessment - Building Discipline Practice Questions - HKIE Professional Assessment - Building Discipline (Hong Kong Institution Of Engineers) Exam

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In deep basement excavation for Hong Kong urban developments, what is the primary structural function of bentonite slurry used during diaphragm wall trenching?

To accelerate the hydration and strength gain of adjacent structural concrete To exert hydrostatic pressure against the trench walls, preventing soil collapse prior to reinforcement cage placement and concreting To permanently seal the surrounding soil against groundwater inflow after excavation To act as a lubricant for the hydraulic trench cutter cutting wheel teeth

Correct Answer:

To exert hydrostatic pressure against the trench walls, preventing soil collapse prior to reinforcement cage placement and concreting

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