There are two irritating problems in using mobile cement mixer trucks: concrete solidification and concrete disintegration. Today we will leave the former aside and talk about the latter. According to a technological illustration, concrete disintegration refers to the phenomenon of uneven concrete organization and structure and the phenomenon that mixed materials get separated from each other because of insufficient cohesive force which fails to prevent big-sized particles from falling down. Simply speaking, aggregates get apart from powder materials during delivery by mobile cement mixer trucks. In other words, mixed concrete is not mixed any more.

　　The main reasons for concrete disintegration in mobile cement mixer trucks include immature technology of concrete batching plant operators and problems with mixer trucks. Technology problem proves to be the frequentest reason. There are strict rules for ratio and specification of different grade of concrete. Any wrong usage of water, concrete, aggregates or additives will lead to concrete disintegration. Specifically speaking, the problems might be wrong ratio of water, inferior quality of sand (excessive quantity of stone particles), bad aggregate grade ratio and excessive adding of additives. Inappropriate operating of cement mixer trucks may also cause concrete disintegration. Some new operators feed concrete without discharging all the cleaning water in the tank, which lead to excessive amount of water in the concrete. Temporary pause of tank rotating and rotating at excessive speeds can result in the same problem as well. A last possible reason has something to do with tank design of a mobile cement mixer truck. Some small factories supply trucks with tanks of wrongly arranged blades or disqualified processes.