Teflex Additive for Concrete (Svetlov D)
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The task of increasing resistance to biodegradation of buildings is very important and is ongoing. It was calculated that damage caused by biodegradation is in the region of billions of Dollars and besides that, bio-contamination of buildings causes serious health problems for the occupants. At this time there are many products on the market which attempt to tackle the problem of bio-contamination. All those products are generally called fungicides. After thorough research of scientific journals and through the market it was discovered that the most effective treatments are polymeric substances, especially those that contain free Nitrogen. They have a positive electron charge in their structure which helps them bind to the negatively charged cellular surface. However, it is a highly complicated technological process to produce such polymers. Because of the antimicrobial power of Guanidine, interest in its manufacture grew. Guanidine is part of the composition of amino acids and vitamin B which makes it non-toxic. Guanidine’s chemical structure makes it suitable to accept further additives which create a positive charge and result in good biocidal qualities. We discovered the formulation of effective biocidal products, which are oligomers of salts of polyhexamethyleneguanidine, with the general formula
Н-[NH-C-NH-(CH2)6]b- [NH-C-NH-(CH2)6]c
HN.HX. HN.HA,

BIO-RESISTANCE

TABLE 1 – Bactericidal Activity
TABLE 2 – Biocidal Activity
TABLE 3 – Results of investigating the influence of Teflex on properties of cement composition resistance to mold fungi
TABLE 4 – Results of investigating the influence of Teflex on properties of Gypsum resistance to mold fungi
TABLE 5 - Results of investigating the influence of Teflex on properties of concrete resistance to mold fungi
TABLE 6 - Results of investigating the influence of Teflex on bio-resistant properties of glass (particle size < 0.16mm)
TABLE 7 - Results of investigating the influence of Teflex on bio-resistant properties of glass (particle size 0.16 mm - 0.315 mm)

Analysis of the investigative results shows that introduction of Teflex into compositions of Portland cement and strained cement in concentrations more than 5 and 3 percent respectively increases fungal resistance of concrete block, and in concentrations more than 7.5% gives higher resistance. This implies the possibility of using compositions consisting of cement, water and Teflex in buildings with biological media for calking cracks, creation of coarsely porous blocks, etc. Results show that Teflex mixed in concentration of 3% allows media to become fungi resistant such as in Gypsum for plasterboard. After experimentation, it was proved that Teflex increases the biological resistance of different building materials. The addition of Teflex not only improves biological resistance but also improves the physical structure of the materials used, such as density, strength and water-repellent properties.
The addition of Teflex to cement as a plasticiser results in the requirement for less water and improved workability of the mixture.

Table 8 reflects how various concentrations of Teflex result in reduced need for water in the mixture.

It was also shown the addition of Teflex increases the density of cements and concrete, thus increasing the compression strength of the material.
It was further discovered that adding Teflex to such mixtures decreases the setting time.

Table 9 reflects how various concentrations of Teflex result in reduced need for water in various mixtures.
Table 10 Dependence of average density of (М 400 Д 20) material to quantity of Teflex added.
Table 11 Dependence of average density of (М 400 Д 20) material to quantity of Teflex added.
Table 12 Dependence of compression strength for (М 400 Д 20) material to quantity of Teflex added.
Table 13 Dependence of compression strength for (М 400 Д 20) material to quantity of Teflex added.
Table 14 Setting time of material based on quantity of Teflex added.
Table 15 Setting time of (НЦ 20) material based on quantity of Teflex added.

One of the important qualities of Teflex is that it improves water resistance. By adding up to 3% Teflex to mixtures increases water repellence by 9.7%. If 10% Teflex is added to the mixture, it increases water repellence by 15%.
The maximum increase in strength of composites (13%) occurs with the addition of 3% Teflex from dry weight of substance. Use of Teflex leads to an increase in the density of materials; a 7.3% compression strength increase with a 3% addition of Teflex. If 10% of mix is Teflex, resulting increases are: 27% compression strength increase and 9% density increase.

Table 16 Dependence of change of water absorption of a material on the basis of (xxx) through the addition of Teflex.
Table 17 Dependence of change of water absorption of a material on the basis of plaster through the addition of Teflex.
Table 18 Dependence of change of compression strength on the basis of (xxx) through addition of Teflex
Table 19 Dependence of change of compression strength on the basis of (xxx) through addition of Teflex

Water / Chemical Resistance
For all cement composites the introduction of Teflex raises their water resistance. The best results are reached by introduction of between 3%-6%. For Example, a composite containing 6% Teflex maintained water resistance above 40% for a sustained period of 90 days.
Plaster composites with Teflex addition up to 6% causes an increase in water resistance. For example, composites containing 6% additive Teflex maintained 20% water resistance for 90 days test period.

Table 20 Dependence of change of water resistance of cement composites based on addition of Teflex and during time of test.
Table 21 Dependence of change of water resistance of plaster composites based on addition of Teflex and during time of test.

In conclusion, the introduction of Teflex to cement and plaster in quantities between 3%-6% has a positive effect on biological resistance, compression strength and water resistance.
The addition of Teflex to all cement composites increases their chemical resistance, and composites that receive between 1%-3% Teflex, and which are sustained in a 2% sulphuric acid solution further increase their durability.

Table 22 Dependence of change of factor of chemical resistance on the basis of (xxxx) sustained in 2% solutions of sulphuric acid from addition of Teflex.
Table 23 Dependence of change of factor of chemical resistance on the basis of (xxxx) sustained in 2% solutions of sulphuric acid from addition of Teflex.

The results in the table shows that introduction of Teflex to various composite materials gives a positive effect – increasing biological resistivity, increases durability and chemical resistance.