1, common admixture use misunderstanding
1.1 Purchase admixture at a low price
Due to the fierce market competition, mixing station for raw material procurement control strict. Mixing stations hope to purchase raw materials at the lowest price, so is concrete admixture.
Mixing station will admixture purchase price depress, is bound to lead to admixture manufacturers reduce quality level. And the general mixing station in the purchase contract rarely clear admixture acceptance standards. Even if there is, it is only clear in accordance with the GB requirements, and gb requirements are generally the lowest standard. This leads to the admixture manufacturer in the case of winning the bid at a low price, the quality of the supply of admixture is low, generally barely meet the requirements of the NATIONAL standard, it is difficult to meet the functional needs of the mixing station for the use of admixture.
1.2 Limit the amount of admixture
Mixing station decision-making layer of the mix ratio cost monitoring is strict, and even the amount of cement, admixture amount is also clear requirements. This will inevitably lead to the technical department in the mix ratio design, dare not break through the decision-making layer of the admixture of the highest dosage requirements.
1.3 Lack of quality monitoring and trial verification of admixtures
At present, for the storage detection of admixtures, most mixing stations are for solid content, water reduction rate, density, net slurry fluidity and other technical indicators of 1 ~ 2 detection, few mixing stations for concrete test.
In the production practice, we found that even if the admixture of solid content, water reduction rate, density, net slurry fluidity and other technical indicators to meet the requirements, the concrete test may still not reach the original effect of the test, that is, the concrete water reduction rate is insufficient, or poor adaptability.
