Production of Concrete Admixtures (Additives). Construction Chemicals. Admixture. Chemical Admixtures used in Concrete.
Admixtures are artificial or natural materials added to the concrete besides cement, water and aggregate to improve certain property of concrete during casting or setting or service stage.
A material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to control setting and early hardening, workability, or to provide additional cementing properties.
Admixtures are generally used to alter the properties of concrete (such as increased workability or reduced water content, acceleration or retardation of setting time, acceleration of strength development, and improved resistance to weather and chemical attacks) to make it more suitable for a particular purpose. For example, calcium chloride can be used to accelerate strength development in mass concrete during winter. Air-entraining admixtures (inexpensive soaps, detergents, etc.) entrain air which greatly improves the workability of concrete and thus permits the use of harsher and more poorly graded aggregates and also those of undesirable shapes.
Functions of Admixture
Major functions and advantages of using admixtures are detailed below:
· To improve workability of fresh concrete
· To improve durability by entrainment of air
· To reduce the water required
· To accelerate setting & hardening & thus to produce high early strength
· To aid curing
· To impart water repellent / water proofing property
· To cause dispersion of the cement particles when mixed with water
· To retard setting
· To improve wear resistance (hardness)
· To offset / reduce shrinkage during setting & hardening
· To cause expansion of concrete and automatic prestressing of steel
· To aerate mortar / concrete to produce a light-weight product
· To impart colour to concrete
· To offset or reduce some chemical reaction
· To reduce bleeding
· To reduce the evolution of heat
Concrete admixtures are used to enhance the properties of concrete for applications in concrete works with special requirements.
Concrete admixtures are used to modify the properties of concrete to achieve desired workability in case of low water cement ratio, and to enhance setting time of concrete for long distance transportation of concrete.
The demand for concrete admixtures is directly related to cement consumption trends. Some of the drivers of the concrete admixtures market are improving quality of construction in developing economies, increasing demand for high rise buildings, roads, bridges, tunnels and dams. Reduction in water usage and construction time is the major concerns of contractors and manufacturers, which could be rightly addressed by making effective use of concrete admixtures.
Indian admixtures market revenues are projected to grow at a CAGR of around 12% during 2014-19.
The worldwide concrete admixtures market, along with its applications, witnessed high growth in the past few years and is likely to continue so in the coming years. The drivers identified for the concrete admixtures demand are growing infrastructure requirements in developing economies, improving economics of construction, and shifting preferences of population towards urbanization. It is also influenced by consumer awareness, need for durable and aesthetic civil structure, and other benefits achieved in making concrete structures more economical for contractors and other stakeholders.
The market size, in terms of value, of concrete admixtures is estimated to be USD 11.68 Billion in 2015 and is projected to reach USD 18.10 Billion by 2020, at a CAGR of 9.15% between 2015 and 2020.
The Asia Pacific concrete admixtures market, along with its end products, has witnessed a linear growth in the past few years and this growth is estimated to increase in the coming years. Concrete admixtures are chemical formulations that are added to concrete at the initial mixing stage to enhance or modify the properties and workability of the mix. Concrete admixtures are used to enhance strength, durability, chemical resistance, and other properties, thus making concrete more suitable to satisfy the needs of modern civil structures. Concrete admixtures have found wide acceptance in the construction industry worldwide; especially for the construction of residential buildings, industrial amenities, and social and commercial complexes, and surface transportation infrastructure projects.
The concrete admixtures market in Asia Pacific has been experiencing significant growth in recent years, which is expected to continue in the near future, mainly driven by the highly growing demand from various end-use industries. Considerable amount of investments are being made by the various market players to serve the end-user applications in the future. China is the largest market for concrete admixtures market in the Asia-Pacific region, having accounted for 76.3% of the total Asia-Pacific demand in 2014.
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