题目内容

Gap-graded aggregates are missing one or more sizes of material. Their gradation curve has a near horizontal section indicating that nearly the same portions of the aggregates pass two different sieve sizes. ______ aggregates are missing small aggregate sizes that would block the voids between the larger aggregate. Since there are a lot of voids, the material will be highly permeable, but may not have good stability.

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According to the ASTM D4791, an aggregate particle with the longest dimension to the middle dimension of the particle exceeds the 3 to 1 is an______ particle.

Setting time include______ and ______ time

Vibrators are used to consolidate the concrete to reduce ______ in the mix.

______ is the most common method used in the field to determine the air content of cement concrete.

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