The matching of cement and pumping agent must be determined through adaptability testing to determine the optimal dosage.
The more air entraining and retarding components there are, the slower the slump “falls out”; Conversely, the faster.
Naphthalene based high-efficiency water reducing agents perform well below+5 ℃, but once heated up, the loss rate immediately doubles.
If the setting agent of hard gypsum or the early strength component C3A in cement exceeds the standard, it will cause the slump to change instantly.
The content of C3A should be locked in the range of 4% to 6%: if it is lower than 4%, it is necessary to reduce air entrainment and slow down condensation; If it exceeds 7%, it must be supplemented, otherwise false coagulation and rapid coagulation may occur at any time.
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