To solve the problem of incompatibility between admixtures and cement, the focus is on prevention, the selection of materials and the detection of incoming materials. The adaptability of admixtures and cement is a complex problem, and the problem of incompatibility between admixtures and cement occurs. Concrete manufacturers take timely measures: according to the situation, based on experiments, analyze and find the reasons, adjust the concrete mix ratio, and improve the factory. slump, reducing slump loss.It is often necessary to adjust the amount of fly ash, increase the amount of admixtures, increase the liquid phase residue of the admixture in the concrete, keep the water-cement
ratio unchanged, and increase the amount of cement, which undoubtedly increases the unit cost. Or the secondary addition method can be adopted, that is, the slump at the factory is controlled at 80-100, and the admixture solution is vigorously stirred for about 2 minutes to adjust to 140 before use at the construction site, which is more economical and effective. Concrete manufacturers often need additives to adapt to the cement due to the large inventory of cement, that is, the admixture manufacturers need to adjust the formula, according to the cement used by the concrete manufacturers to adjust the types and amounts of water reducers and retarders in the additives, or increase the amount of Plasticizer, air-entraining agent with no bubbles, etc.
The determination of the concrete mix ratio also needs to take into account the coagulation time of the concrete, the admixture contains retarding ingredients, the temperature drops suddenly at a higher temperature, the admixture in the concrete is too much, and the formula is not adjusted in time, resulting in a long-term failure of the concrete. Condensation will seriously affect the strength of concrete. In summer, construction should also avoid the noon period of high temperature and wind, and cool the raw materials. The determination of the sand ratio in the concrete construction mix ratio should also be adjusted according to the size of the sand fineness and the porosity of the coarse aggregate.Thereby, the problem of incompatibility between cement and admixture can be solved to a certain extent, and the loss can be reduced.
Post time: Jul-25-2022