Limestone is the easiest and cheapest hybrid material for cement plants. At the same time, it can also improve the series of performance of cement, including reducing cement standard consistency water volume, improving the compatibility of cement and water reducing agent, and improving the water retention of cement.

After using natural and cheap resources, limestone is used as a mixed material for cement production. Compared with slag, flour, and volcanic ash, it is guaranteed, the price is low, the transportation is convenient. Economic value, so many cement plants currently want to add a large amount of lime to reducing costs. So how can we add as many lime as possible without affecting the quality of cement?

About 5%to 8%of lime stones are mixed in cement instead of clinker, which can improve the early strength of the cement and do not significantly reduce the late cement intensity. However, when the amount of limestone is large, compared with the slag, flour ash, etc., limestone will significantly reduce the intensity of the cement. A measure to improve high lime mixing cement in the later period is to add certain chemical additions during cement production. Studies have shown that some organic alcohol substances have a later intensity enhancement effect on high lime mixing cement.

The role and characteristics of limestones in cement use

Limestone is often simply mistaken for only a filling, reducing the amount of clinker in the cement to achieve the purpose of reducing the cost of cement manufacturers.

In fact, there are two main factors for the impact of lime and clinker common powder grinding on the strength of the cement. On the one hand, the limestone can be tightly dense after the limestone is appropriately compared with the table Increased, more studies have shown that limestone participates in the reaction in hydrated pulp, generates early strong mineral carbon aluminum acid, and promotes intensity development. Such inertia or low -active micro -albums contribute to the intensity of cement slurry. Supreme to more than some volcanic ash activity mixed materials. However, on the other hand, limestone hydration activity is limited, and large amounts of limestone are used, and the relative content of clinics is reduced, and the intensity will be reduced in the later stage.

The surface of the limestone fine powder particles is smooth, and the water attachment on its surface is less. Therefore, limestone also has a certain physical water reducing effect, and the incorporation of limestone does not affect the concrete time of the cement.