essentially in construction and masonry work of the term "dosage" means measuring as accurately as possible the various components or elements which become part of a mixture to achieve the uniformity necessary for the strength and toughness for the job or function for which to play. Strength and toughness for the case of the columns and beams (structures) and hardness and good finish for walls, floors and ceilings (drywall).
Usually both for the preparation of a mixture of resistance or finish three materials are needed such as: aggregate, cement and water. Depending on the materials would be talking about:
stone, sand, cement and water form> Concrete
Arena, Cement and Water Fitness> Mortar
Earth, Cement Water and Fitness> Soil-Cement or cake
(for pasting conditions of emulating a cake mix)
dosing in the first two results there is no problem, because their quantities required for formation of concrete or mortar, have been calculated and tabulated by the safety standards in construction of buildings is concerned, but when it comes to using common land requires experimental tests prior to use, due to the great diversity within these components and their variation from one place to another, such quantities of sand and clay contained, waste vegetables and other inert elements that severely affect the final result of a mixture of cement and for this the most logical to do laboratory tests.
As is well known that in low-income population, especially inside the territory does not have neither the resources nor the technology to make this series of tests have already been pre-study the resistance of the common land by the density of composite elements within it.
should be noted that the final product obtained by the right mix of soil-cement and is the part that concerns us, to build a land base as a primary place in use of popular housing and other buildings, we will not stop to calculate the strength of this deeply, and that evidence obtained and to follow a single pattern that defines its strength, we assume that the resistance of this mixture to the fracture compression is from 12 to 70 Kg per cm2, which gives a safety factor of 3 to 4, resulting in a working ratio is above 1 kg per cm2, for the earth or adobe constructions requiring Standards Buildings for calculations required by the MOP (1947).
Now how we can apply what is known so far in our building?
know until now that depending aggregate contained within the earth is the base for mixing with cement and then with water. Then I say because it has become a habit that the mixture becomes all together, ie the land is added above the cement and water after beating the three items at a time. ERROR, the mixture is weakened because there is always called at the end of beating or paddling, areas where there was concrete, which is the catalyst of the hardness of the mixture, leaving sandy parties arising from the apparent homogeneity in the coming years resulting in a weak structure and leads to breakage in case of concrete, or a mixture esboronocidad poor and lost in the case of adobe blocks and mortar friezes.
The most suitable and abiding by the rules of good construction, the mixture should be as follows:
1 .- Join the aggregate with cement, stirring so that the resulting mixture is a completely homogenous color with no streaks of color or darker than other areas.
2 .- Having thus obtained the mixture with corresponding doses are necessary to add water in a proportion also established so that the beat it also forms a slurry or too dry nor too watery and equal all together for maximum strength is calculated for such land.
Now entering the amounts of cement by ground parties, proceed to the following:
Ø The amount of cement to be mixed to the land that will produce soil-cement materials depends on the proportion of sand contained in the land. This ratio is determined using an ordinary bottle of clear glass and transparent which previously marked the bottom up every 2 cm to a total of 10 cms upwards. Internally before placing a piece of land previously mixed the site to a height of approximately four (4) fingers, which will proceed to fill with water almost to the end of it. Ø
Shake the bottle tightly covering the neck and inverting it several times, then let it sit until they are seated in order of density of the sand first, the grit and finally the clay.
The settlement of the components will be separated by clean lines.
Looking at the bottle can be the dividing line between light and heavy elements. Taking the measure precisely the heavier aggregates or placed in the background, are measured by brands few bands of sharp deals and if you say that the earth has so many parts of sand by land.
for it then go to the following table which tells us how many parts in our measurement of land for cement should be our preparation.
sandy areas
PARTIES
Arena - Cement - Earth
1 --------- 1 ------- 7-8
2 --------- 1 ------- 9-11
3 -------- 1 ------- 12-14
4 --------- 1 ------- 15-16
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