For the concrete admixture mixing method, from the technical effect, the use of post-mixing method, stagnant water method, a small number of multi-mixing method, the effect is better. This requires some adjustments and changes in the device of concrete conveyor. For example, installing a set of instruments and devices with post-mixing or multi-mixing reinforcement anti-cracking fibers on mixing trucks can greatly improve the adaptability of concrete admixtures and cement, and can better exert the technical advantages of the trucks and bring better economic benefits.
2. Formulation and dosage of concrete admixture
Adjusting the formula of concrete admixture can reduce its influence on the solubility of gypsum, improve the solubility of gypsum and control the concentration of SO42? If anhydrite is used as a coagulant, it is more important to reduce or even not use such substances as xylo-calcium and sugar-calcium, because they are easier to reduce the solubility of gypsum. When using highly reactive substances, retarding, water-retaining and plastic-retaining components should be properly compounded. In addition, increasing the amount of concrete admixture can reduce the slump loss rate of concrete admixture. Reducing the amount of concrete admixture can reduce the bleeding situation.
III. Adjustment of Concrete Proportion
In accordance with different engineering and design requirements, the concrete should be reasonably proportioned. If the concrete is seriously bleeding, some admixtures can be added or the water consumption can be reduced or the sand rate can be increased appropriately. If the slump loss rate is high, the amount of concrete admixture or water consumption can be increased appropriately.
IV. ADJUSTMENT OF ADMIXTURES
Reduce the content of MgO, f? CaO and CaSO4 as far as possible, control the balance among C3A, OH?, SO42?, and ensure that the content of C3A in concrete is less than 8%.
V. Comprehensive Measures
Through adjusting the formula of concrete admixture, adjusting the proportion of concrete reasonably, adopting different mixing technology, or replacing part of cement with part of admixture, the adaptability of cement and concrete admixture has been adjusted after many tests.
I. Mixing Processing Technology of Concrete Admixture
For the concrete admixture mixing method, from the technical effect, the use of post-mixing method, stagnant water method, a small number of multi-mixing method, the effect is better. This requires some adjustments and changes in the device of concrete conveyor. For example, installing a set of instruments and devices after mixing or adding concrete admixtures more than once on a mixing truck can greatly improve the adaptability of concrete admixtures to cement, and can better play to the technical advantages of the truck and bring better economic benefits.
2. Formulation and dosage of concrete admixture
Adjusting the formula of concrete admixture can reduce its influence on the solubility of gypsum, improve the solubility of gypsum and control the concentration of SO42? If anhydrite is used as a coagulant, it is more important to reduce or even not use such substances as xylo-calcium and sugar-calcium, because they are easier to reduce the solubility of gypsum. When using highly reactive substances, retarding, water-retaining and plastic-retaining components should be properly compounded. In addition, increasing the amount of concrete admixture can reduce the slump loss rate of concrete admixture. Reducing the amount of concrete admixture can reduce the bleeding situation.
III. Adjustment of Concrete Proportion
In accordance with different engineering and design requirements, the concrete should be reasonably proportioned. If the concrete is seriously bleeding, some admixtures can be added or the water consumption can be reduced or the sand rate can be increased appropriately. If the slump loss rate is high, the amount of concrete admixture or water consumption can be increased appropriately.
IV. ADJUSTMENT OF ADMIXTURES
Reduce the content of MgO, f? CaO and CaSO4 as far as possible, control the balance among C3A, OH?, SO42?, and ensure that the content of C3A in concrete is less than 8%.
V. Comprehensive Measures
Through adjusting the formula of concrete admixture, adjusting the proportion of concrete reasonably, adopting different mixing technology, or replacing part of cement with part of admixture, the adaptability of cement and concrete admixture has been adjusted after many tests.