On the contrary, some quality control is stable, mixing ratio cost control is better mixing station, the use of admixture quality is better, the price is higher, because of high quality and less use, the unilateral cost of admixture decreases instead.
Some mixing stations limit the amount of admixture. Below the circumstance that concrete slump degree is insufficient, technical branch either reduces sand, stone moisture content, or raise concrete unilateral water consumption, bring about concrete strength to drop directly. The technical branch with stronger quality consciousness can be in indirect or raise concrete unilateral water consumption directly at the same time, raise the amount of cementitious material appropriately (maintain water glue ratio unchanged), bring about concrete mix ratio cost to increase.
Mixing station lack of quality control and test of admixture verification. When the quality of admixture fluctuates, the technical department still uses the original mix. In order to meet the slump requirement of concrete, the actual water consumption of concrete increases, the water-binder ratio increases, and the strength of concrete decreases.
