Dry Building Mixtures - Making The Right Choice

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Dry Building Mixtures - Making The Right Choice
Dry Building Mixtures - Making The Right Choice

Video: Dry Building Mixtures - Making The Right Choice

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  • The mixture of sand, cement and water must be carefully calibrated
  • The composition of dry mortar based on cement
  • Application of dry cement-based mortars
Choice of building mixture
Choice of building mixture

And studying the estimate of the necessary building materials, drawn up by the foreman of the finishers or a more experienced acquaintance (relative), the homeowner draws attention to the dry building mixtures present there, reacting like this: - And what is this? Why do you need to overpay for some packaged cement mixture if you can make it yourself ?! Yes, this is a robbery in broad daylight! I will not pay exorbitant prices for packaged cement with sand!

The mixture of sand, cement and water must be carefully calibrated

I will notice right away that even a mixture of cement and sand prepared and packaged at the factory has better building properties than a mixture of that sand and cement prepared by builders directly at the work site. The thing is that the builders make up the mixture according to the principle "as God puts it on the soul", keeping in mind the main recipe - 1 part of cement, 7 parts of sand and a sufficient amount of water. You need more plasticity, for example, when applying plaster - the builder-finisher will increase the amount of cement in the mixture. And all the ingredients - by eye, using the simplest working tool - a shovel, a bucket and a trough.

Understanding perfectly well that the "life" of the building will depend on the quality of the cement mortar, some customers of the construction work take upon themselves the solution of this issue. Their representatives order the usual mixture of sand and cement from manufacturers of dry building mixtures with the conditions - strict compliance with the brands of cement and sand, verified proportions in the mixture, laboratory tests for each batch. This method is more expensive, but gives a significant guarantee of the quality of the mortar, and therefore the masonry.

The composition of dry mortar based on cement

Each manufacturer develops the exact recipe independently, keeping it secret. In addition to sand and cement, each dry mixture contains modifying substances of chemical production that improve a number of properties of the mixture - they retain water in solution, increase plasticity, slow down or accelerate hardening, prevent shrinkage, etc.

The total share of chemical modifiers in dry mixtures does not exceed 2-3%, despite this, their presence in mixtures significantly affects the cost of each package - a kilogram of a Western-made modifier is expensive for a manufacturer of mixtures, and they cannot be done without them when it comes to quality mixtures.

The composition of cement dry mixes
The composition of cement dry mixes

The composition of cement dry mixes includes sand of a certain brand and fraction. Before being added to the mixture, the sand undergoes a preparation during which coarse sand grains and dirt particles are separated. For example, as part of

Each cement mixture uses its own brand of cement - cement of the M100 brand is used for masonry mixtures, The thoroughness with which serious manufacturers prepare ingredients for dry building mixtures will allow repairs to be carried out in a short time and with a high result - the tile adhesive will reliably hold the tiles for many years, the plaster will not peel off, etc.

Application of dry cement-based mortars

It is important to follow the instructions - if the mixture solution is not designed for application with a thickness of more than 5 mm, then when applied in a thicker layer it will dry longer, or it may not dry at all.

Application of dry building mixes
Application of dry building mixes

This is due to the action of a chemical modifier - cellulose ether, which is capable of retaining large amounts of water. This component is needed if the applied layer of the cement-sand mixture is thin, so its rapid drying and hardening is delayed - for leveling.

Most often, the dissatisfaction of consumers of dry mixtures is associated with violations of the technology of their use by them.

Each type of mixture includes various additives that determine its properties, so you should always follow the instructions for use of the dry mixture on the package. This is especially true of the amount of water required to prepare the solution. Many buyers who carry out repair work prefer to increase the presence of water in the solution - so supposedly it is possible to increase the amount of the solution, which means that it can cover a larger area. I will disappoint everyone who practices such actions - nothing will come of it, moreover, excess water will worsen the quality of the mixture. Don't try to outperform the manufacturer! The formulation of the mixture, where cement acts as a binder, undergoes multi-stage tests before the dry mortar appears on store shelves.

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