For testing cement compressive and tensile strength, mortar specimens are prepared using a cement-to-standard-sand ratio of___________________?
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Answer: B. 1:3
Explanation
Standard mortar specimens for cement testing are mixed using a strict cement-to-standard-sand ratio of 1:3. This precise ratio ensures uniform test results across different laboratories evaluating cement compressive and tensile strength. Using three parts sand to one part cement provides an optimal workability and aggregate interlock for testing. Cement strength testing requires standardized mortar briquettes or cubes cured under controlled environmental conditions. Standard sand used in these testing procedures possesses strictly graded particle size distributions specified by standards. Consistent batching eliminates variations caused by aggregate grading when comparing different cement manufacturing batches.
Option A proposes a 1:2 ratio, which contains too little sand and does not conform to standard testing codes. Option C suggests a 1:4 ratio, creating a leaner mix that fails standard cement testing specifications. Option D proposes a 1:6 ratio, which lacks sufficient cement paste to bind the sand aggregate adequately.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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