User:Prevailcosmosindia
INTRODUCTION CONSTRUCTION CHEMICALS
Welcome to the world of universal construction industries involving in production of building construction chemicals and cleaners like Preserve under the chemical admixtures, which is different from others.
Chemical admixtures are those which are used to improve the behavior of concrete
under a wari etc of conditions and are of two main types: Chemical and mineral.
Our productions are more economical and cost effective and can be used in tropical conditions as will as in very low temperature region. It reduce the cost of construction, modify properties hardened concrete, ensure avality of concrete during mixing/
curing and over come certain emergencies during concrete operation. It falls in to following Categories.
Preserve :- Preserve Ac:-
According to George A. Mitchell and A.M. Mitchell chemical admixture which is Ac type, are more beneficial, economical, cost effective and can be used in low amount6, (i.e.100 ml per bag of cement) and at low temperature.
(Source :- Building construction, by George A. Mitchell and A.M. Mitchell in 16th edition by B.T. bats ford LTD., 15 North Audley Street, May fair and Malvern Wells. Worcester Shire, London). Because Preserve Ac is silicate based and chloride free hence it forms strong bonding rapidly to make concrete structure more stronger and more durable.
Preserve:- (A complete cement admixture of latest technology, an essential ingredient for building construction)s
Totally chloride free, superb Plasticizing, water reducing, high early and final strength providing excellent water proofing, Strong reinforcement concrete bond making and corrosion inhibiting agent.
Why Should Use :-
1. Because, it makes concrete and mortar remarkably cohesive and improves bonding strength. 2. Because, it provides high workability of cement concrete, retards the initial setting time for perfect working. 3. Because, it convert the high heat cement like 43 and 53 grades to low heat cement, deactivating the high heat producing hydrolysis process, enabling them to be used under tropical conditions also. 4. Because, it provides excellent water proofing properties. 5. Because, it provides excellent resistance to sewage water, sea water, acid rains and salty atmosphere of coastal region. 6. Because, it provides a corrosion resistant coating over reinforcement and makes strong bond between the cement concrete and reinforcement making the R.C.C. Structure remarkably strong, high tensile and extremely durable. 7. Because, it improving coverage of plaster with classical finish. 8. Because, it provides high strength with suitable douses and make upto 15-20% saving in quantity of cement used possible. 9. Because, it provides corrosion resistant coating with strong structures. 10. Because, it provides early and final strength with reduced permeability. 11. Because, it has high range water reducers, super politicizes, and accelerating composition. 12. Because, it is economical/ profitable for per cast R.C.C. & P.C.C. Structure shapes etc. 13. Because, it makes the building earthquake resistant. 14. Because, it control the erratic problems of cement due to excessive free time found in the Portland cement. 15. Because, it is able to reduce crack in plaster over 95%.
How to Use :-
1. In Sand cement mortar for masonry work and plaster, in cement concrete, mixture for R.C.C. structure, P.C.C. flooring, mosaic flooring, mosaic tiles etc. use one liter (2 L.) Preserve in 200 Liters. Of water i.e. 0.5%, (50 ml in 10 ltrs of water), (200 ml of Preserve Per bag of cement). 2. For injection / pressure grouting work in earthquake buildings prepare cement slurry with Preserve 21 liters. In 100 liters of water i.e. 2% (200 ml in 10 liters of water). Very high bonding/ Strength is achieved.
CHEMISTRY : PRESERVE
The main strength giving constituents of port land cement are Tricalcium Silicate (3 CaO. Sio2) and Dicalcium Silicates (2CaO. Sio2) . Tricalcium silicate (Ca3S) Contributes towards early Strength on the other hand, Dicalcium silicates (Ca2S). Contributes towards later strength of cement. 1. Hydrolysis 2. Hydration 1. Hydrolysis :- When water is added to Cement, Hydrolysis . of silicate takes place in fallowing manner.
3 CaO. SiO2 + H2O Water is less 2CaO. SiO2 + Ca(OH)2
2 (3CaO. SiO2 )+ 3H2O Water is more 2CaO. 2SiO2 + Ca(OH)2
2. Hydration :- These Silicate take up water molecules to form hydrated
Silicate molecules. In the proves of non reversible get formation which
then change into meta- stable get with simulataneous production of . . crystalline products during the setting of cement paste. Hardening of . the set cement paste is due to development to much strong and . irreversible inter twined crys falling Structure.
In normal course of cement setting and hardening cement actually loses strength as the calcium silicate of higher basicity decompose to lower basicity during the process of hydrolysis and on hydration these lower basic calcium silicate from hydrated calcium silicate cryshals of lower molecular weight and therefore esquire less strength during hardening process.
The concrete as per BIS 456:1978 is designated in seven grades, namely M10, M15, M20, M25, M35, and M40. The letter M refers to mix and numbers indicates the specified compressive strength of that mix at 28 Days expressed in
N/mm2 . For lean Concrete bases and simple foundation for masonry walls, M5 and M7.5 Grades of concrete lower then M 15 are not to be used in R.C.C. different grades as fallows : M5 - 1:5:10 M15 - 1:2:4 M 7.5 - 1:4:8 M20 - 1:11/2:3 M10 - 1:3:6 M25 - 1:1:2
Also,
1:1:2 and 1:1:2:2:4 - For very high strength concrete 1:11/2:3 and 1:2:4 - For normal work 1:3:6 and 1:4:8 - For foundation and mass concrete work.
In dilute solution, Preserve as soon come in contact with Portland cement, stop the process of hydrolysis and does not allow the cement to lose its strength.
Preserve Ac:-
(A complete concrete and mortar admixture with latest and advance technology in India.Based on European Technology).Totally chloride free, inorganic based, superb plasticizing and accelerating compound, providing excellent water proofing.
Why Should Use:-
1. Because, it increase the rate of hardening and developing better strength in concrete or mortar structures. 2. Because, it provided or it is better for pre cast concreting. 3. Because, it provide rapid setting of concrete at low temperature or concerting in cold weather conditions. 4. Because, it provided better plasticized structure with rapid setting. 5. Because, it converts the high heat cement like 43 and 53 grades to low heat cement, deactivating the high heat producing hydrolysis proves, enabling them to be used under very low temperature varies between 5oc to 20oc). As well as in tropical conditions. 6. Because, it provides high strength with suitable, doases and make upto 20% saving in quantity of cement used possible. 7. Because, it has high range accelerating, and super plasticizing composition. 8. Because, it activates admixture to gel formation which is the latest technology in concrete or mortar admixture. 9. For providing excellent water proofing properties. 10. Because, it is able to reduce crack in plaster or it is better admixture for plaster work with reducing loss of cement. 11. Because, it provides corrosion resistant costing with decreasing void formation. Also it is chloride free. 12. For providing excellent resistance to sewage water, sea water, acid rain and salty atmosphere of coastal regions.
How to use:-
1. In sand- cement Mortar for masonry work and plaster in cement concrete mixture for R.C.C. structure, P.C.C. flooring, mosaic flooring, mosaic tiles etc. use 1/2ltr. Preserve Ac in 100ltrs. Of water i.c. 0.50% (50ml in 10ltrs of water.) 2. For injection/ pressure grouting work in earth quick building prepare cement slurry with Preserve Ac 1ltrs. Of water i.e 100ml per part of cement very high bonding strength is achieved. 3. For top plaster siling plaster, use 200ml per bag of cement. 4. For seepage/ leakage treatment uses 400ml per bag of cement.
CHEMISTRY : PRESERVE AC
Two main process take place during setting and strutting of cement i.e. Hydrolysis and hydration.
Hydrolysis of silicate takes place when water is added.
3CaO.SiO2+H2O less water 2CaO. SiO2+Ca(OH)2
2 (CaO. SiO2) + 3H2O more water 2CaO. 2SiO2+3Ca(OH)2
The Silicate take up water molecules to form hydrated silicate molecules. In the proves of non reversible gel formation which then change int meta-stable get with simultaneous production of crystalline products during the setting of cement paste. Hardening of the set cement paste is due to development of much stronger and irreversible inter twined cry stalling structure.
In dilute solution, Preserve Ac, as soon as corner in contact with Portland cement, stop the process of hydrolysis and does not allow the cement to lose its strength. Gel activates the gel formation and with the help of high grade plasticizers it forms a very cohesive and plastic mass of Portland cement in which the initial setting time is retarded for perfect working.
Preserve Ac solution reacts with the reinforcement and cement concrete mass thereby facilitating a high tensile strength.
Two main reaction take place during corrosion which includes in electrolytes process. Because Preserve Ac is fully chloride free and inorganic based no electrolytes were formed thereby no any electrolytic process therefore Preserve Ac does not cause corrosion.
Preserve Ac decreases the void formation and porus structure by reducing permeability thereby Ca2 and H2O enters inside the structure.
CO2 and H2O Causes the ll nd process which take place with the following reaction.
Fe+O+2CO2+H2O Fe(HCO3)2 2Fe+(H+CO3)2+O 2Fe (OH)CO3+2CO2+H2O) Fe+(OH+CO3+H2O Fe(OH)3+CO2
Because of less void formation by reducing permeability thereby no CO2 and H2O remain inside the structure and it results in the the decreasing of ll nd process.
Preserve Ac is a silicate based admixture which is used as a plasticizing and accelerating Composition. Rate of strength development by Preserve Ac is being takes place by the various test procedures used in checking the strength of concrete are: Compressive strength Test, Tensile Strength Test, Flexural Strength Test,
Ready under a wide variety of exposures following results are obtained.
Type of test Age at Test 3 days 7 days 28 days 3 months 1 years Compression 35 59 100 135 161 Flexure 53 71 100 126 143 Tension 46 68 100 121 150
During active gel formation the whole mass accumulates high percentage of water and hydration process in activated to acquire very high degree of hydration, that’s why hardening of the hydrated mass continues, even after stopping the water curing, for last 72 hours, till all accumulated moisture is transformed and hardening process is complete to achieve final strength.