What is Sika admixture?
Sika provides a wide range of concrete admixtures with innovative options for concrete mix design, whether it’s for substantially reducing the water content of a mix (e.g. with Sika® ViscoCrete), using a more economical mix design or achieving sufficient early strength.
What are the chemical admixtures used in concrete?
Types of Concrete Admixtures
- air entrainers.
- water reducers.
- set retarders.
- set accelerators.
- superplasticizers.
- specialty admixtures: which include corrosion inhibitors, shrinkage control, alkali-silica reactivity inhibitors, and coloring.
What is concrete chemical?
Concrete chemicals or admixtures are materials other than cement, aggregate and water that are added to concrete either before or during its mixing to alter its properties, such as workability, curing temperature range, set time or color.
What is concrete chemicals Name some concrete chemicals?
There are several chemical admixtures that include water reducers, accelerators, anti-freezing admixtures, air-entraining admixtures, alkali-aggregate inhibitors, shrinkage compensating admixture, and corrosion inhibitors etc. Figure 1 shows some of the chemical admixtures meant for use in cement concrete.
What is the chemical in concrete?
Water and cement initially form a cement paste that begins to react and harden (set). This paste binds the aggregate particles through the chemical process of hydration….Hydration of Portland Cement.
| Cement Compound | Weight Percentage | Chemical Formula |
|---|---|---|
| Tricalcium silicate | 50 % | Ca3SiO5 or 3CaO.SiO2 |
| Gypsum | 5 % | CaSO4.2H2O |
What is the chemical reaction in concrete?
hydration
Cement and water form a paste that coats each particle of stone and sand—the aggregates. Through a chemical reaction called hydration, the cement paste hardens and gains strength.
Which chemical is used to increase the strength of cement?
Concrete Admixtures: Accelerating Accelerating concrete admixtures are used to increase the rate of concrete strength development or to reduce concrete setting time. Calcium chloride could be named as the most common accelerator component; however, it could promote corrosion activity of steel reinforcement.
What is Sika Plastocrete?
Sika® Plastocrete®-10 N is a new generation, synthetically manufactured, water reducing normal set admixture for concrete. Sika® Plastocrete®-10 N meets the requirements of ASTM C 494, Type A, B and D admixture. Increased workability and easier placeability. Improved finishing characteristics for flatwork.
How many types of chemicals are there in concrete?
Types of Concrete Chemicals (Admixtures) and Applications Based on their functions, admixtures can be classified into the following five major categories: Retarding admixtures. Accelerating admixtures. Superplasticizers.
What are the admixtures used in concrete?
The most common types of chemical admixtures for concrete are: Water Reducing Admixtures – (Also called plasticizer and super plasticizer) Plasticizers reduce the amount of water needed in the concrete mix. The less water (lower water/cement ratio) used to achieve a workable mix will result in a higher strength concrete.
What are concrete admixtures?
Concrete Admixtures. Admixtures are additions to a concrete mix that can help control the set time and other aspects of fresh concrete. Common admixtures include accelerating admixtures, retarding admixtures, fly ash, air entraining admixtures, and water-reducing admixtures.
What is concrete water reducer?
A water reducer is a chemical compound added to concrete before or after it is mixed in order to produce concrete using less water while maintaining the material’s workability, meaning it will not harden or set too quickly or too slowly.