First, admixture product quality inspection, the determination of an admixture composition, performance and quality stability, to determine whether it reaches the specified physical and chemical performance indicators.
Such as appearance, effective substance content, solubility, specific gravity, pH value of aqueous solution, chloride ion content, sulfate content, sugar content, foaming, surface tension and whether there is rust on the reinforcement.
Second, the admixture into the cement slurry (also known as net slurry) performance test, to check the performance of the admixture to adapt to different varieties of cement should reach the index.
Its measurement items are net slurry flow, setting time, heat of hydration exothermic changes, stability, settlement test, etc.
Third, the admixture into the concrete to do the adaptability test, that is, the admixture into the concrete to do a comparison test with the benchmark concrete, test its fresh concrete water reduction rate, water secretion rate, air content, setting time, slump loss, test the concrete after hardening compressive strength, seepage resistance, frost resistance, shrinkage, covariance, and whether there is corrosion of reinforcement.
These test items should achieve the quality control index (including the benchmark concrete) and the quality requirements of the test material, in the “Concrete Admixture Application Technical Specification” has clear provisions. The purpose of this part of the test is to confirm whether the selected admixture is adapted to the concrete performance of all other materials, including cement varieties, can meet the design requirements for concrete performance. Construction department in the above test after passing, according to the construction of the actual choice of sand, stone and other admixture materials, combined with the results of the above test, adjust the ratio, do the admixture range of preferential test, the results will be provided when the construction of the use.
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