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Discussion on the harm of commercial concrete to random water addition and management measures

2015 / 6 / 25 14:16:06 Click:

   one Harm of adding water to commercial concrete

Commercial concrete changes the original mix proportion by adding water, which leads to the increase of water binder ratio and the decrease of concrete strength. After adding water, floating slurry is produced, which leads to the decrease of concrete compactness, the decrease of concrete self waterproof ability, the deterioration of concrete impermeability and crack resistance, and even the engineering quality.

two The following measures shall be taken to prevent commercial concrete from adding water

two point one Concrete quality management before delivery formulated by commercial concrete company

one )Under the strict control of production personnel in the laboratory. During the production process, it is the laboratory technician who shall measure the moisture content of coarse and fine aggregate, and each shift shall not be less than once , When the water content of aggregate changes significantly, the water content should be adjusted according to the test results. In the production process, technicians must pay close attention to the fluidity, water retention, cohesiveness, sand rate, air content of concrete, loss of concrete mixture over time, setting time of concrete, etc. The tester shall visually inspect the slump of each vehicle and control the factory slump according to different parts. Only when the construction requirements are met can the technician sign for confirmation.

two )Before each loading, the driver of mixer truck shall check whether there is residual water in the mixer truck. The laboratory shall inspect the residual water of mixer truck regularly, strengthen the quality awareness of mixer driver, and do a good job of monitoring during the handover process.

three )Production scheduling to do a good job in the field of production coordination, to avoid the occurrence of mixing truck escort and unloading too slow slump loss.

four )Strengthen the maintenance of the pump, so that its performance as far as possible to meet the needs of construction.

five )The laboratory shall do a good job in trial mixing, master the changes of raw materials and the adaptability of admixtures and cement at any time, adjust the mix proportion at any time, do a good job of concrete slump loss over time, and ensure good workability (slump and bleeding) of concrete.

two point two Management of drivers and pump workers before transportation to pouring

In the high temperature season, the fluidity and workability of concrete become poor due to long transportation time and high temperature. It is strictly forbidden for drivers and pump workers to add water without permission. If the concrete can not be constructed due to the slump loss, it shall be returned to the concrete company after confirmation by the technical personnel and shall not be used in the concrete structure.

two point three Construction management in the process of pouring

one )In order to facilitate the construction, some construction units improve the concrete pouring amount per unit time, but ignore the concrete quality. In order to save money, some building owners employ some temporary workers. They do not know the quality of concrete. They take water pipes to add water to the concrete at will. When the concrete is initially set, cracks appear on the surface, and the later detection strength can not reach the design strength. The concrete production enterprises shall issue concrete instructions to all construction units, and the construction party shall strictly implement the concrete construction specifications, and shall not add water or use the concrete that has not been unloaded or has initially set beyond the delivery time.

two )In order to ensure the project quality and quality disputes, the construction unit strengthens the management of the on-site concrete pouring workers. The supervisor shall implement the stand-by system and supervise the construction party in time. The basic characteristics of on-site water adding are as follows: generally, the water adding situation in night construction is more serious than that in the daytime. The main reason is that there are no management personnel in some construction sites at night. The quality of on-site pouring construction is mainly in the charge of concrete pouring workers. Due to no restriction and quality consciousness, the concrete pouring workers do not bear any quality responsibility, but only reduce the labor intensity and shorten the pouring time Water. In order to ensure the quality of the project, we hope that all construction units will implement personnel, responsibilities and procedures in place in the process of concrete pouring, and jointly maintain the project quality.

three )For the construction site that has been handed over to the migrant workers for control and coordination for many times, but still unwilling to improve, the supply will be stopped.

With the development of commercial concrete enterprises, the quality awareness of construction units has been improved. As long as the corresponding measures are taken from management and technology, strengthening the management of each link, and implementing the responsibility, the phenomenon of adding water can be completely eliminated and the quality of concrete can be ensured finally.