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Home » Problems often encountered in the production process of concrete mixing plants

Problems often encountered in the production process of concrete mixing plants

I. Concrete performance issues

  1. Fast or unstable collapse loss
    • reason: Poor adaptability of concrete admixture and cement; insufficient admixture dosage; hot weather leads to admixture failure, rapid water evaporation, and bubble overflow; improper initial collapse setting; poor coordination between the construction site and the mixing station, resulting in excessive transportation time; large measurement errors in the mixing and weighing system; changes in aggregate water content, etc.
    • Solution: Adjust the admixture formula to adapt to cement; adjust the concrete compounding ratio; increase the admixture dosage in an appropriate amount and adjust the retarding composition; prevent water from evaporating too quickly; choose the appropriate cement type; improve the water retention and cooling device of the transport vehicle; strengthen the accuracy and stability of the metering equipment; strengthen the detection of the water content of the aggregate and adjust the compounding ratio in time.
  2. Secretion and isolation
    • reason: Cement has large fineness, low C3A content, and small water consumption for standard consistency; unit water consumption is too large; the mixture temperature is too high; the strength level is low; the sand rate is small; the selection of continuous particle size gravel and single particle size gravel is improper; the performance of the admixture is poor or the dosage is too much, etc.
    • SolutionOptimize the mixing ratio; reduce the unit water consumption; increase the sand rate; add appropriate amount of fly ash; use continuous graded gravel; improve the performance of additives and so on.

II. Equipment failures and operational problems

  1. Failure of mixer metering equipment
    • reason: Aging equipment, improper maintenance, lack of precision, etc.
    • Solution: Strengthening the maintenance and upkeep of measuring equipment to ensure that its accuracy is in accordance with the regulations and that it has a valid legal measuring certificate; strengthening self-inspection to ensure that the measurement is accurate.
  2. Mixer truck breakdown
    • common problems: Broken speed reducer screws, reversed drum leakage, water inside the drum is not discharged.
    • SolutionDo a good job of daily vehicle inspection, focusing on checking key components; check whether the anti-reverse pin is inserted properly before loading; ensure that the water inside the drum is drained after washing the vehicle and after heavy rain; and forbid the arbitrary addition of water in the process of transportation.

III. Construction management issues

  1. Poor coordination between the site and the mixing plant
    • manifestations: Tanker trucks are pressurized and congested for long periods of time, resulting in degradation of concrete properties.
    • Solution: Enhance communication and coordination between construction sites and mixing stations to optimize transportation routes and reduce waiting time.
  2. Water addition during construction
    • reason: Adding water arbitrarily to adjust the slump results in an increase in the water-cement ratio, which affects the quality of the concrete.
    • Solution: It is strictly prohibited to add water arbitrarily, and the slump problem should be solved by adjusting the admixture of additives or the proportion of the match

IV. Other Frequently Asked Questions

  1. Poor pumpability of concrete
    • reason: Improper selection of mixing ratios, low cement dosage, irrational grading of sand and gravel, etc.
    • Solution: Optimize the mixing ratio, increase the amount of cement, improve the grading of sand and gravel, and so on.
  2. Concrete test block production and curing problems
    • common problems: Irregularities in the production of test blocks, non-compliance with maintenance conditions, etc.
    • Solution: Produce test blocks in strict accordance with the specifications, strengthen the management and maintenance of test blocks to ensure that the maintenance conditions meet the requirements.

To sum up, concrete mixing plant in the production process faces a variety of problems, need to strengthen raw material testing, optimize the proportion, improve equipment performance, strengthen construction management and other measures to solve the problem. At the same time, it is also necessary to focus on personnel training and management, improve the skill level of operators and quality awareness.