Technology savings ct

Cement - one of the most widely used, important and deficit-tsitnyh building materials, and even in our country are produced annually Ven atochnoe amount of cement, its lack of a constant but noticeable. This is not only in the fact that the scale of construction is enormous - more shortage of cement depends on its out-wasting in the preparation of concrete and mortar, from the super-regulatory its losses during transportation and storage.

One of the main causes of over cement - unsecured-ties of high quality aggregates and loss of their activity with poor storage. Highly cements when stored in clear text (not in airtight containers) rapidly reacts with moisture in the air, bringing the brand down..

Dissatisfaction is with the transportation of cement that. Transportation of cement in covered wagons, bulk lead when unloading and reloading of significant losses. Besides of time, when the cement reaches the faucet, the losses exceed its standard-setting (equal to 1%) in a few times.

Experts believe that it is possible to reduce the consumption of cement (and thus improve the quality and durability of structures), if to prepare concrete from clean graded aggregates. The Organization of production of such fillers will require considerable investment, but the economy is weather-you much compared to the cost of repairs and replacement of concrete structures-tion, often going out of action much earlier SRO-ing, which is designed to operate. In the foreign construction practices no company produces concrete to fill-Lyakh a fraction of 5-20 mm. For example, in Finland, he is preparing for the four pure fractions of coarse aggregate and the two factions-the flock. In this case, the homogeneity of the concrete produced as-you juice that its strength is determined by testing a sample: company manufacturing concrete guarantees its brand strength.

A powerful means of saving cement are chemical additives, and especially plasticizers. Until recently in our country as plasticizers used various industrial wastes. As a general rule, the effect of Actio-tviya such supplements was low, their chemical composition is often not stable. Domestic industry specifically for concrete on-Chala produce effective plasticizer - superplas-tifikator-3 kotoroya in its action to the best-of watershed models in its class, and the cost is 5-6 times cheaper.With the introduction of this additive in the concrete can save up to 20% of cement (when the plasticity of concrete). Not decrease-zhaya cement consumption and increasing the ductility of the concrete mix, but by reducing its water-cement ratio, you can increase strength of concrete by 20-25%.

The effectiveness of the cement can be increased (and, therefore, lowering its consumption zit), increasing the fineness of his grind. In enterprises of precast concrete to concrete as soon as possible dos Teague stripping strength, often go for overstating grade of concrete by increasing cement consumption. You can avoid this if we used a more astringent fine grinding: at a binder solid-set concrete at early age faster. You can save cement in another way: to introduce the cement sand, limestone or ka-Coy or other filler and with him make cement. However, studies show that, with the brand of binding reduction etsya, though not exactly in direct proportion to the number of the introduction of the first core. To obtain concrete grades up to 200 or even higher, something that is quite acceptable binder. Depending on the amount of filler put-tion (30-50%), you can save up to 50% of cement. The effect can even greater if you apply superplasticizers.

Certain reserves reduce the consumption of cement are available in the separate preparation technology of concrete.Although This method is long known, but so far have not found the use of technology in the concrete. To get the desired effect in the first place, it is necessary high-capacity mixers, corresponding to an amount of solution needed for one batch of concrete mixture in a conventional mixer.

In Japan, the separate method of preparation of concrete applied with success. Compact turbulent mixing needed for tacos th method, there is mounted directly on the main betonosme carriers, and their performance is fully linked.

It is noted that one of the patients questions cement saving problem - its loss during transportation storage, significantly higher than normative. We can not allow the delivery of cement in all-gonah bulk unload it by hand, stored in bulk under a canopy-mi and barns, handled with a lot of congestion from one mode to another. Especially great is the loss of the cement delivery in areas where there are no railways and has to be transferred from rail to river, and then to trucks. This can be avoided if those areas are not taking out-lyat cement, cement clinker, the quality of which is not lost during transportation and storage. At the site, you can grind and always have fresh cement of high activity.

There are other ways to save cement - the use of high-quality forms of control samples, subject to a further on-the-crease in the strength of concrete rational Concrete mix design and solutions, the use of automatic devices for dispensing components, etc. If all this is put into production, and correctly use, the problem of shortage of cement would be removed, as it would give an additional minimum of 30% of cement from production ICDO its volume.

Дата добавления: 2015-08-27