When carrying out construction work, in special conditions, rapidly glorifying and acidic cement is often used. The first allows you to make high -quality material as soon as possible. The second is used in those conditions where the strong effects of acids are expected. In this article we will describe in more detail these cements.
Acid -posed composition – properties and scope of application
How they get raw materials and make cement
This composition is made by mixing and grinding sodium silicon and quartz sand. It is bred not with water, but with liquid glass, which should have a module of more than 2.7. After the mixture is shut up, it gradually passes into a solid stone -shaped body, which has resistance to many organic and mineral acids. The strength of this material for stretching is 20 kg/cm2. Cement is hard enough. Moreover, to accelerate the procedure, it is important to observe the appropriate conditions by temperature. So, the first day t should be more than 15 ºС. Accordingly, with an increase in temperature, the process of hardening the material will accelerate.
After some time, when the cement turns into a durable stone, it is treated with the acid that will be present in operating conditions. Thus, the material is checked for resistance to these components. This composition is used most often in the chemical industry, as well as in construction, where there is a strong effect of acids. For example, it is used to make all kinds of containers for chemical plants, when erecting towers, to cover the seams. The only area where this cement cannot be used is water structures. Since this material begins to collapse from water.
Distinctive features of fast -dry cement
Video kneading cement mortar
This cement is used in those conditions where the rapid drying of the material is required. For example, in the manufacture of reinforced concrete and high -strength products. Thus, heat treatment costs are reduced (as you know, thermal chambers occupy a large area in factories and spend a lot of fuel). The rapidly shuffling composition is also used in the erection of structures made of monolithic concrete with the use of deciduous and sliding formwork. In general, the material is widely used in other areas. It is only worth saying that Germany, Russia, Japan and the United States using special technology has developed an even more fast -hard -harding cement, which is used in emergency conditions.
Make this product in accordance with GOST from the most ordinary clinker. Sometimes they change its mineralogical composition. But in any case, active additives in it should not be more than 10%, since their high content helps to slow down the hardening of the material. The exception is only a granular slag, which is 15% of the weight of cement. Add it in such quantities because it has astringent characteristics. Three days after mixing the mixture, the material acquires strength at a bend of about 40 kgf/cm2. If a super -hardening composition is used, then its strength is 250 kgf/cm2 at a single -day age. And after 3 days it is more than 300 kgf/cm2.
Tips for experts
We will talk about the preparation and application of the material on the example of the mixture of BOTACEM M 55. This product is usually used to finish internal surfaces. For example, it is used for a heated floor or when creating a layer of cement on top of isolation material. For external rooms and with high humidity it cannot be used. In a concrete mixer, cement with granular sand and clean water is kneaded. As a result, the resulting composition should be consumed within half an hour. It is necessary to apply it only on the prepared base.
This means that the surface should be clean, dry and not frozen. Be sure to eliminate the remains of fat, paints, dried building mixtures. Apply the solution smoothly, then the layer is aligned. The temperature in the room during work should be from +10 to +25 s. During drying, it is important to protect the coating from drafts and the sun. After 3 days the coating will dry out.
It is best to take components in a ratio of 1: 4.5 – that is, 225 kg of sand is needed 50 kg of cement. Water is added depending on the humidity. And remember, you do not need to additionally put some ingredients into the composition.