Everything about white cement

  Own researches or small chemist

At some point, knowledge of binder materials, own ambition, the desire to test themselves makes trying to do something. About the same chemistry - how it works and what can be - has already been mentioned here. In addition, be aware of the many other issues - the most important of which will be described below. These products are generally available, if not all building warehouse, at least in those selling products of high quality.

1. The world is a whole bunch of cement plants, sometimes acting as producers of cement, which sometimes actually only works as a paker, and sometimes as a clinker grinding plant or grinding "solid" spent clinker to the desired grain size, which of course also takes outside clinker adding other ingredients. This means that, in principle, any cement even IR designated as originating from different sources behave differently. This "way" is conditioned by the addition of acting as a regulator setting time, which is quite often - gypsum.

This is a clear signal that almost no possibility that the laboratory has investigated the effect and behavior of an additive chemical with every type of cement which you can get on the market, the more that some of them are not produced in local (national) planr, and only imported either from the producer country or from plants "scattered" around the world, which in their target markets include Europe.

2. The most common and one of the most popular supplements available on the market are plasticizers. They are designed to reduce the amount of mixing water used to mix. The first step is to read the data sheet and technical data sheet and description of the product itself, to find out:

  • - what is the active substance (this is generally several types of long been known and commonly used based on klutan across melanines finised on compounds based on polycarboxylates or its derivatives); each of them has different application ranges, each of which has an effect on blend, each with a different dosage regimen and the symptoms associated with the overdosing
  • - what are the boundary / extreme dosage values - given either on the weight of the whole, or merely cement />
  • - what is the way of adding and restrictions later in preparation for the use of the entire mixture; part of the compounds, for example, exclude the addition of water in installments, the other - on the contrary

In theory, additional information about the product should provide technical adviser manufacturer or importer, but in practice it might be that you need to call several people to their statements about the particular type of plasticizer and piece together a picture of the whole. In the case of such talks is the most important active substance used in the plasticizer and the thickness (size) grains in concrete or mortar.

Usually comments on the entry of the properties can decipher that plasticizers "softly and gently aerate the mix." For users, this information is that it really should be a mix of mix calm to the cities plasticise not aerate concrete. The latter are the special touches - the use of which must be closely associated with what is saved in the information producer.

The same test should consist of creating a control sample - without the additive, for example - plasticizer, and two or three samples from the additive. Usually, the rates close to the minimum, average and maximum. After stirring experiencing a change of consistency of the mixture (concrete, mortar etc.), water addition, the time of bonding, or anything that differs from the "standard." Some studies can be performed only in a few or several days after the start of the binding process. Sometimes only 28 days of flooding form such as a ripening time of cement.

Of course, all the results are recorded, allowing you to accurately assess the impact on our particular blend of the exact composition is a plasticizer selected and how to maintain are those that described by the manufacturer.

In some cases, you can obviously see what will happen when the amount of the allowance shall be increased well above the maximum specified by the manufacturer the size - in this case, the effects can be almost exclusively either very good, or below expectations, often enter for you in the area not tested and discovered only by us.

3. After selecting the correct or appropriate samples from an earlier stage, you can add another chemistry. By slowly adding one ingredient can be accurately determined desirable or not and change their direction and substance, which was responsible for.

Continuing - the objective may be, for example, flexibility of the blend. Appendix found. Of course you can, and even need to call several manufacturers starting with the one who is the producer of the first that was used - here plasticizer. Talking with more advisors and technologists need to know in addition to the active substance which is used in a plasticizer. Sometimes it happens because that forces it or exclude the use of certain types desired by our chemistry.

The procedure is similar as before, or add just one chemistry to the specific composition of observing and checking whether and how to behave whole. The most important is usually predictable behavior of the mixture, or the ability to determine changes depending on how much will be added, how to follow certain desirable processes (flexibility, liquefaction, aeration etc.) and when it is exceeded the limit, indicating that the substance under no circumstances suitable for use or ownership are getting worse.

In the case of deeper modification of certain properties, eg., Instead of plastic deformation - liquefaction, or making to blend behave more like water, which flowed (hence the name), or instead of plastic deformation - to facilitate distribution (sometimes you find the magic word “application” meaning in this case is specific use desired by us) used two of our compounds can potentiate the action or act "on the cross," that is important is the ratio of the size / quantity in which they are added. Unfortunately, such behavior will require scrupulous investigator really observe what is happening.

For these reasons, you can start checking chemicals produced or provided by one company. Typically, adviser or technologists knowledge within a single manufacturer which active substances used in their products they like, and what on the contrary. This should allow at least at the beginning to eliminate some errors and problems that may be found during our research.

Interestingly, with any additional changes have already been well described results of the study, even those carried out on the same team, we can fairly accurately determine where they are going. Comparing the data, eg. after one, and three consecutive days - will be very soon, you can specify the changes that occurred in the same properties of the mixture. Checking and some chosen and desired by our performance at the "here and now" application (use), in these particular conditions can be accurately determine the direction of changes (eg. the workability, the beginning of the bond, the amount of water etc.) and compare eg. a pattern (ie, specific assumptions or a commercially available product) to which we aspire.

4. Among the additives used in concrete can meet the so-called fiber reinforcement, or polypropylene fibers or glass fibers with different properties. Among the important parameters it is important to the thickness and length of these fibers. This means that you first need to know what will be applied mix (concrete, mortar, etc.). Both the quantity and the quality depends on the composition and the intended destination.In fact, this means that adding an appropriate amount of the fibers can increase the strength of the mortar, flexibility or plasticity caused by the pressure or a direct or indirect (if anything else is put on the surface, eg. concrete).

Some of the most popular sizes and thickness can be easily purchased in most stores, but really accurate information about the purpose and properties can be achieved in principle of technical assistance related to the manufacturer. Often it happens that every manufacturer has a specific group of these fibers to the application.

Also in this case the procedure should be similar as before. This means that with the results of previous tests can and should try to choose the composition of guaranteeing the most desirable properties and further modify it by changing the quantity and quality of the fibers. It is important to note that this is quite a rich literature available allowing yourself to learn many interesting things, including about reservations or restrictions, which have the data types of fibers. The results of research supported by the basic knowledge often just let us compose your own mix of exactly the parameters you want to achieve.

It should be remembered that the fact that someone had not had the idea to give the other, sometimes innovative application of a specific supplement, does not mean that it can not be. Maybe just two or three "enriching" very well interact with each other. Similarly is the other way - boisterous ensure the manufacturer that the product is fully "compatible" does not mean that it will happen just with our recipe. You have to check it out.

5. Among the various formulations can be found interesting are f.ex.. retentors, which means to bind the water in the mixture (generally a surplus) to prevent delamination of that on the one hand, and on the other to serve as a warehouse to moisture during hardening mixtures based on cement. This allows the composition to increase the amount of water added to the mix, which accelerate certain processes - for example. gains strength. One of the most popular are also used in foodstuffs are microsilica, methylcellulose and its derivatives.

6. Such a large amount of chemical additives (and not only) means that we have to take into account in the process of mixing and use of each manufacturer's reservation regarding the preparation, the time at which the measure becomes chemically active, the number of revolutions during the initial mixing. Any manufacturer, vendor each of these needs, and should give us or provide data sheets, technical data sheets and usage. Of course, you may find that in laboratory or semi laboratory conditions, some of these recommendations may be unnecessary (eg. The mixing time, the time at which begins activity), but you have to remember that it really our product, and with him is what is inside, also works at much higher temperatures, which usually is not a problem, and those close to + 5C, which could already be a problem. Extreme performance can and should be explored, but never in the lab do not get to such conditions as can be found on the outside, they are on site.

Apart from these few mentioned only sketchily supplements is the enormity of the other (thixotropes, accelerators / retarders time bonding, sealants, impregnating agents, and a whole bunch of others) occurring in at least two or three forms: powder, liquid, ready or concentrate, and various forms of indirect characterized that can change all the possible properties of cement based products. Each of them interacts and affects the other, they are all laboratory tested, a good portion of them are agents of the highest quality, produced by a really reputable companies in the world. It's just we should realize how important are our own tests on our own blends and how accurate observations must be what changes at a given time are called. Perhaps you will find that two agents of the same composition nearly identical purpose operate in a drastically different way, because our cement or filler is one or the other. You have to be careful.

Any chemistry that exists in the world will not allow us to basically get one thing - white glue / concrete / grout etc. on dark gray cement or filler. This means that one way or another, remember alb first create a good composition, for which we will begin to work - that is, for example. White / light mortars use of white cement and white or very light filler and should be very carefully watch how much and whether generally we added modifiers affect the color of the mix itself. It may be a fact that the addition of dark (even thixotropic) will change the color of us throughout our product and find it only after drying time compared to a control sample. The opposite may also occur.

In the case of colored mixtures - pay attention not only on whether the chemicals affect the color or not, but also how much is changing its intensity. It may turn out that great chemistry complementary to the gray cement due to his "other" property is not suitable at all to mix-stained mass. Similar problems can occur if you change the binding material (cement), as a replacement for (instead of white - gray, instead of the type IR - type II AV) is in itself such additives, which are very susceptible to our extras and simply prevent or slow down bonds in such a way that disqualify our recipe. In extreme cases, it may for example be the case that the cement will not bind at all. This means then that the work begins again.

7. Currently available on the market chemicals regarded as generally various additives to concrete or wider formulation of cement gives a really great potential and is a great starting point to create our own recipes, sometimes even better or comparable to those of the so-called. reputable manufacturers

The fact that the hand is not very widely available laboratory facilities, powerful teams working on many things at once does not mean that one is no chance. A lot of things you can learn by reading the basics of binding materials, using proven additives, and most importantly, really accurate and reliable research to what we have at hand. In many cases, sampling almost every day and checking the differences in their characteristics and what parameters and when it reaches used our cement and comparing these to trap we are interested in relationships and properties much faster than the 28 days, when in compliance with the cement reaches its properties.

Methods for testing of certain parameters are available "online", and the most common procedures are described not only as part of the standard, but also in a much more comfortable, that is, eg. as an article or analysis concerning changes in the law. This will examine created by us samples of the mixture in the exact way or similar, in which they will be tested already in the renowned laboratory, which should confirm whether only our own internal, let amateur research, carried out however, in accordance with the principles contained in the relevant standards

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