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(4) from the time between mixing and pouring is too long, segregation of concrete water ash, concrete structure is dense, at the time of placement without tamping or vibrating does not

(4) from stirs the time has grown to the construction between, the concrete water ash has the segregation, the concrete structure is not dense, when construction does not perform to inspire pounds or inspires does not pound

( 4) between the deposition from mixing the length of time it takes to concrete water ash occurred not compacting concrete structure, separating, the viscosity is not to be 次 次 or not

(4) from the time between mixing and pouring is too long, segregation of concrete water ash, concrete structure is dense, at the time of placement without tamping or vibrating does not