After long-term research and observation, it has been found that many concrete mixers have misunderstandings about the use of admixtures, resulting in insufficient concrete strength, poor workability, or excessive concrete mix cost. The following will explain to you Some usage misunderstandings:
1. Purchase water-reducing admixture cheaply
Due to the fierce competition in the sales market, concrete mixing stations hope to purchase raw materials at the lowest price. Concrete mixing stations will reduce water consumption. The purchase price of water-reducing agent is very low, which will inevitably cause the water-reducing agent manufacturer to reduce its quality level. Generally, the project acceptance specifications for water-reducing agents are seldom established in the supply contract of concrete mixing stations. This results in the fact that when water-reducing agent manufacturers win bids at low prices, the water-reducing agents they supply are of low quality, often exceeding national standards and unable to meet the requirements for the use of water-reducing agents in concrete mixing stations.
2. Limit the intake of water-reducing agent
The management of the concrete mixing station is strict with the cost monitoring of mortar mix ratio, and even controls the amount of concrete used and the intake of water-reducing agent. The quantity has also been clearly defined. This will inevitably cause technical units to be afraid of meeting the management’s maximum water-reducing agent intake requirements when designing mortar mix proportions.
3. Lack of quality monitoring and trial preparation certification of water-reducing agents
The concrete mixing station lacks quality monitoring and trial preparation of water-reducing agents. When the quality of the water-reducing agent fluctuates (decreases), the technical unit still uses the original mortar mix ratio. causing some unnecessary losses.
4. The harm of incorrect operation of admixtures
In life practice, people have found that even if the water-reducing agent has solid content, water-reducing rate, relative density, slurry fluidity, etc. If the performance indicators meet the requirements, the concrete experiment may still fail to achieve the actual effect of the trial mix at that time, that is, the concrete water reduction rate is not enough, or the adaptability is not good enough. Because the quality of cheaply purchased water-reducing agents is low and cannot achieve sufficient water-reducing effects, technical units often increase the intake of water-reducing agents, resulting in excessive use of water-reducing agents. On the other hand, some concrete mixing stations with stable quality management and good mortar mix ratio and cost management use water reducing agents of good quality and relatively high prices. Because the high-quality water-reducing agent is used in less quantity, the overall cost of the water-reducing agent is actually reduced. Some concrete mixing plants limit the intake of water reducing agent. When the concrete slump is insufficient, the technical unit will either reduce the water content of the sand and stone, or increase the unilateral water demand of the concrete, which will directly cause the strength of the concrete to decrease. Technical units with a strong sense of quality will not only indirectly or directly increase the unilateral water demand of concrete, but also appropriately increase the amount of admixtures used, resulting in an increase in concrete mix costs. </p
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