How dry cement - from which this parameter depends ?

cement solidification time and the traditional order of work

Cement is the most traditional astringent for various concretes.Rational its combination in admixture with other excipients (gravel, crushed stone, sand), water and additives for various purposes underlies common artificial stone materials.

But the process of creating the concrete product is quite complex and involves a whole sequence of works carried out in stages, from the selection and connection components to create a mixture, ending with the need to care for stacked solutions after the start of their hardening.

theoretically correct composition prepared on the basis of cement after the installation in the form of formwork and compaction begins to harden, gradually increasing strength.Such artificial stone immediately after drying does not have sufficient characteristics to continue building on its basis: first, it is easily destroyed by any load.

During hardening cement minerals of its grains are transformed into extremely durable compounds called hydrosilicate potassium.This transformation, starting an avalanche, gradually reduce your speed and lasts a long time, sometimes lasting for years.

However, the time, the above is sufficient for the acquisition of the level of strength required to continue construction.In the case of a particularly responsible concreting period allowed for curing the composition, it may be extended up to three months or more.

Setting time of cement - that affects the rate?

In order to grasp the process began and took place with the increase of strength characteristics, requires certain conditions.For example, in cold conditions, when a water solution freezes, setting can not start at all, magical transformation hydration occurs.

setting time The above cement is assumed to be certain conditions for outdoor and indoor works.Existing regulations stipulate temperature range (about twenty degrees Celsius), normal pressure, high humidity, and other factors (protection from direct solar heating).To further increase the strength of concrete at first requires some care, periodic moisture, protected against direct sunlight.

This is achieved by using special films and moistens the fabric to prevent rapid loss of moisture.It is permissible to use the traditional coating of sawdust, straw, with obligatory periodic moisture especially in the first week after the laying formwork solutions.

The quality of the stone depends also on the activity of the factor of the binder composition, ie,on its quality.Mark meets the high quality requirements, and provides a consistent quality product.How much cement hardens, it depends on the correctness of its relationship with water.

As we have seen, the monolith structure ensures reliable adhesion binder placeholder elements in the solution.In turn, this coupling is a result of its reaction with water, so it is important the correct choice of the ratio of these two components.

How can affect how much cement dries?

The above requirements to ensure normal concreting, in a real building is not always respected.It is difficult to provide the necessary stability to weather conditions, ambient temperature, etc.Therefore developed a range of measures to influence the process, ie,on how long dry cement.

For example, to work at low temperatures applied pledged heating solutions.Here devised clever ways of electrical heating, creating a thermos effects, special shelters, warming steam etc.By the way, the hydration process of hardening is accompanied by the release of a sufficient amount of heat that the large volumes of work often has a negative value.

for concreting on an accelerated schedule can be applied which reduce the setting time as salt and salt-free.Among such materials include sodium, calcium and potassium compounds (nitrites, nitrates, carbonates) such as potash.

opposite effect, slowing down the hardening have additives used, for example, on delivery of ready mixtures to the objects, etc.Typically, the hydration properties deceleration possess surfactants.Their content in the formulations is determined depending on the ratio of water and binder.