Concrete mixing plant # Concrete mixing plant, when mixing concrete, the operators of the mixing plant must enter and control the data in strict accordance with the construction batching list issued by the tester and the mixing time and technical disclosure. The abnormal phenomenon in the stirring process should be timely reacted, analyzed immediately and dealt with in time. Production is not sustainable until the workability of the mixture meets the requirements. Concrete mixing time for all materials into the mixer to start mixing, to start unloading time is not less than 2 minutes, not more than 3 minutes. The stirring time should be strictly implemented in the construction of high-speed railway.

This is stipulated according to the characteristics of high performance concrete. Avoid mixing time less, and affect the uniformity of concrete, etc.

Under normal circumstances, the feeding sequence and specific mixing time of the mixer:

Sand, cement, fly ash, mineral powder and mixing (30S) - water, admixture and mixing (30S) - coarse aggregate feeding and mixing (30S) - mixing (30S) - discharge.

After the mixing water is heated, the concrete material feeding sequence is: water, sand, gravel mixing (40S), cement mixing (40S), fly ash, mineral powder (40S), admixture mixing (30S) discharge.

The temperature of concrete entering the mold should be controlled within 5-3O ℃. If it does not meet the requirements, measures should be taken to raise and cool the sand, stone, water, etc. In the actual construction, the water cooling treatment is used. In summer, the water is cooled with ice, and the water temperature drops below 18 degrees. Winter mining

Adjust the temperature of the mixture using the preheating method of heating water, but the water temperature does not exceed 8O degrees. When the heating water can not meet the requirements, the aggregate can also be uniformly heated, so that the heating temperature should not be higher than 60 degrees.

Measurement system is the key to affect concrete quality and concrete production cost. It is mainly divided into three parts: aggregate weighing, powder weighing and liquid weighing. Material weighing using a variety of materials independent weighing way, all weighing using electronic weighing and microcomputer control. In the production process, the operator of the mixing station should pay close attention to the batching error of the concrete produced to ensure the measurement of various materials

Error does not operate the requirements (cement is not more than ± 1%, mineral admixtures ±l %, admixtures, water ± 1%, coarse and fine aggregate ± 2%). All kinds of weighing instruments should be regularly verified, and zero calibration should be carried out before each use to ensure accurate measurement. The metrological parameter data of the mixing station should be analyzed in time and the measurement should be dynamically corrected. Correct measurement error of mixing plant.