Concrete mixing station concrete quality common Fault and Solution

Application of Concrete Quality Control for concrete construction has become an essential part, concrete mixing plant in mixing process often prone or this or that problem, progress and construction quality to cause trouble. Cause now it is often mixed concrete problems to be analyzed, and a series of solution.
1. Reasons pumping concrete slump loss, slump instability problems and solutions
Causes
(1) concrete admixtures caused by poor compatibility with cement concrete slump loss quickly.
(2) The content is not enough concrete admixtures, retarding, plastic - not ideal.
(3) the hot weather, some admixture fail at high temperatures; fast evaporation; bubble caused by spills of fresh concrete slump loss quickly.
(4) initial slump of concrete is too small, too little water units.
(5) and mixing station construction site coordination bad, so the pressure tank car, traffic jam time is too long, leading to concrete slump loss is too great.
(6) concrete mixing weighing system measurement error, instability.
(7) coarse and fine aggregate moisture content changes.
(8) Cement mixed storage warehouse, mixed-use.
2 concrete batching plant Solution
(1) The adjustment of concrete admixture formulations to adapt and cement. Before construction of complete concrete batching plant, make sure to test concrete admixtures and adaptability.
(2) Adjust the concrete mix, increase or decrease the rate of sand, water, concrete adjustment to the initial slump more than 200mm.
(3) adding an appropriate amount of fly ash to replace part of the cement.
(4) The amount of content to increase concrete admixtures, retarding admixtures adjustment component (especially at much higher temperatures than normal temperatures).
(5) to prevent excessive evaporation, bubble spills too.
(6) use of slag cement or pozzolan cement.
(7) to improve water retention and cooling equipment concrete truck.
Accuracy
(8) metering equipment should meet the relevant requirements, and have a valid certificate issued by the legal metrology department, strengthen self-test to ensure accurate measurement.
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