For concrete exposed to Hawaiian marine environment, what is the maximum allowable water-cement ratio?
Correct Answer
B) 0.40
Hawaii Building Code limits water-cement ratio to 0.40 maximum for concrete in marine environments to ensure adequate durability against chloride penetration.
Why This Is the Correct Answer
The Hawaii Building Code limits the water-cement (w/c) ratio to a maximum of 0.40 for concrete in marine environments. A lower w/c ratio produces a denser, less permeable concrete matrix that resists chloride ion penetration from seawater and salt spray — the primary corrosion threat in Hawaii's coastal environment.
Why the Other Options Are Wrong
Option A: 0.45
A w/c ratio of 0.45 is too high for marine exposure. While 0.45 is used for some moderate exposure conditions, Hawaii's marine environment is more aggressive due to warm water temperatures and constant salt spray, requiring the stricter 0.40 limit.
Option C: 0.50
A w/c ratio of 0.50 is the standard limit for normal (non-aggressive) environments. In marine conditions, 0.50 produces concrete that is too permeable, allowing chloride ions to reach reinforcing steel and cause corrosion (reinforcement rust → spalling).
Option D: 0.35
A w/c ratio of 0.35 is overly restrictive and not required by the Hawaii Building Code for marine exposure. While lower w/c ratios produce more durable concrete, 0.35 makes the mix difficult to place and consolidate without special admixtures, and the code does not mandate it.
Memory Technique
Marine concrete in Hawaii = 0.40 max w/c ratio. Remember: '40 = fortified.' Less water = denser concrete = better chloride resistance. Or: '0.40 for the ocean, 0.45 for moderate, 0.50 for normal.' Each step up = less protection.
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