Ducon Construction Chemicals industries Ltd is a leading Manufacturer & Suppliers of Concrete Admixtures such as Integral Waterproofing Compound, Water Reducing and Plasticising Concrete Admixture Supplier in Bangladesh, High Range Water Reducing, High Range Water Retarding Superplasticizer, Polycarboxylic Concrete Admixture, Concrete Hyper Plasticizers and many more items best price from Bangladesh and Malaysia.
নতুন বাড়ী বানাচ্ছেন? দীর্ঘস্থায়ী ড্যাম্প মুক্ত বাড়ী চান?
সিমেন্টের সাথে ডিউনমিক্স ৭০০ মেশাতে ভুলবেন না।
Making new home? Want durable damp proof home?
Do not forget to mix Duconmix 700 with cement.
Ducon Construction Chemicals is a company of Leading Concrete Admixture in Bangladesh, Manufacturer and Best Price Suppliers Company in Bangladesh, Malaysia and Many Others Countries.
Ducon Concrete Admixtures
Admixtures are natural or manufactured chemicals which are added to the concrete before or during mix-ing. Ducon Construction Chemicals manufacturing a lots of variety concrete admixtures in Bangladesh for specific need or requirements. The most often used admixtures are air-entraining agents, water reducers, water-reducing, retarders and accelerators. Successful use of admixtures depends on the use of appropriate methods of batching and concreting. Most admixtures are supplied in ready to use liquid form and are added to the concrete at the plant or at the jobsite. The effectiveness of a water proofing admixture in Bangladesh depends on several aspects including: type and quantity of cement, water content, mixing time, slump, and temperatures of the concrete plus air. Occasionally, effects similar to those achieved through the addition of admixtures could be gained by altering the concrete mixture reducing the water cement ratio, adding additional cement, using a various sort of cement, or modifying the aggregate and aggregate gradation.
ASTM Categories – Concrete Admixtures –
ASTM C494 specifies the requirements for seven chemical admixture types. They are:
Type A: Water-reducing admixtures
Type B: Retarding admixtures
Type C: Accelerating admixtures
Type D: Water-reducing and retarding admixtures
Type E: Water-reducing and accelerating admixtures
Type F: Water-reducing, high range admixtures
Type G: Water-reducing, high range, and retarding admixtures
Ducon Water Reducing Admixtures
Ducon water reducing admixtures, the name itself defining that they are used to minimize the water demand in a concrete mix. Workability is the important property of concrete which is improved with the addition of water but if water is added more than required the strength and durability properties of concrete gets affected. In addition to increase in workability it also improves the strength of concrete, good bond between concrete and steel, prevents cracking, segregation, honeycombing, bleeding etc. Ducon Water reducing admixtures are also called as plasticizers and these are classified into three types namely plasticizers, mid-range plasticizers and super plasticizers. Normal plasticizer reduces the water demand up to 10%, mid-range plasticizers reduce the water demand up to 15% while super plasticizers reduce the water demand up to 30%. Calcium, sodium plus ammonium lignosulphonates are typically used plasticizers. Some of the new generation super plasticizers are acrylic polymer based, poly carboxylate, multicarbovylatethers etc.
Ducon Water Reducing Admixtures:
Ducon Retarding Admixtures
Ducon Retarding admixtures slow down the rate of hydration of cement in its initial stage and increase the initial setting time of concrete. Generally, these are also called as retarders and used especially in high temperature zones where concrete would set rapidly. The quick setting in few situations may lead to discontinuities in structure, poor bond between the surfaces, makes unnecessary voids in concrete etc. Retarders are helpful to eliminate this sort of problems. Commonly used retarding admixture is calcium sulphate or gypsum. Starch, cellulose products, common sugar, salts of acids are some other retarders. Most of water reducing admixtures are also acts as retarding admixtures and they are called as retarding plasticizes. Ducon retarding admixture is the best admixture suppliers in Bangladesh.
Reaction of Retarding Admixture: Concrete admixtures influence the kinetic of cement hydration mainly during the dormant period, Volume changes measured with an immersion weighing setup show clearly the effect of concrete admixtures on cement reaction. Retarder agents produce a volume swelling while accelerators force an immediate shrinkage behavior.
Ducon Retarding Admixtures:
Ducon Accelerating Admixtures
Ducon Accelerating admixtures are used to reduce the initial setting time of concrete. They speed up the procedure of initial stage of hardening of concrete hence they are also called as accelerators. These accelerators also improve the strength of concrete in it early stage by increasing the rate of hydration. Earlier hardening of concrete is useful in several situations such as early removal of formwork, less period of curing, emergency repair works, for constructions in low temperature regions etc. Some of the accelerating admixtures are triethenolamine, calcium format, silica fume, calcium chloride, finely divided silica gel etc. Calcium chloride is the cheap and commonly used accelerating admixture.
Ducon Accelerating Admixtures:
Ducon Accelerating Admixtures
Ducon Air entraining admixtures are one of the most important inventions in concrete technology called porosity. Their primary function is to increase the durability of concrete under freezing and thawing conditions. When added to concrete mix, these admixtures will form millions of non-coalescing air bubbles throughout the mix and improves the properties of concrete. Air entrainment in concrete will also improve the workability of concrete, prevents segregation and bleeding, lower the unit weight and modulus of elasticity of concrete, improves the chemical resistance of concrete and reduction of cement or sand or water content in concrete etc. Most used air entrainment admixtures are vinsol resin, darex, Teepol, Cheecol etc. These admixtures are actually made of Natural wood resins, alkali salts, animal and vegetable fats and oils etc.
Ducon Pozzolanic Admixtures
Ducon Pozzolanic admixtures are used to prepare dense concrete mix that is bets appropriate for water retaining structures such as dams, reservoirs etc. They always reduce the heat of hydration and thermal shrinkage. Best pozzolanic materials in optimum quantity gives best results and prevents or reduces many risks such as alkali aggregate reaction, leaching, sulfate attack etc. Pozzolanic materials used as admixtures are either natural or artificial. Naturally occurring Pozzolanic materials are clay, shale, volcanic tuffs, pumicite, etc. and artificial pozzolans available are fly ash, silica fume, blast furnace slag, rice husk ash, surkhi etc. Pozzolans are silicate based materials that react with (consume) the calcium hydroxide generated by hydrating cement to form additional cementitious materials. Why is consuming calcium hydroxide a good thing? Calcium hydroxide (lime) accounts for up to 25% of the hydrated Portland cement, and lime does not contribute to the concrete’s strength or durability. Pozzolans combine with the lime to produce additional calcium silicate hydrate, the material responsible for holding concrete together. By consuming the excess lime:
- The strength of the concrete is increased
- Its density is increased
- Efflorescence is decreased
- The propensity for alkali-silica reaction (reaction with glass) is decreased, or even virtually eliminated
Ducon Super Plasticizing Admixtures