CEMGUARD® Fly Ash
CEMGUARD® Fly Ash is a pozzolanic material, captured in electro-static precipitators as a by-product from coal-fired thermal power stations. It consists of small, hard and spherical particles rich in silica (glass) and alumina, with pozzolanic properties. It complements Portland cement upon hydration by reacting with free lime (calcium hydroxide) to form an additional durable binder, namely calcium silicate hydrate. The spherical particles also have a ‘ball-bearing’ effect, which allows concrete to be produced using less water.
CEMGUARD® Fly Ash is subject to processing/ quality control to regulate its fineness (particle size and distribution, shape and glass content) and unburnt carbon (loss-on-ignition), thus giving quality-assured material which is consistent, predictable and suitable for varied applications. We are working towards CE Marking for CEMGUARD® Fly Ash .
CEMGUARD® Fly Ash is mainly used as a partial replacement of cement in concrete, and has unique properties that benefit both fresh and hardened concrete. Its key advantages include reduced heat of hydration, improved workability, enhanced durability and longer setting time. It can be effectively used where aggregates have poor grading and shape, resulting in bleeding and segregation. It is also suited for mass concrete applications, and in hot and aggressive environments where early-age thermal cracking and durability are major concerns. General replacement of cement with CEMGUARD® Fly Ash in concrete can be 15-35% by weight for normal structures. However, for special structures such as dams, the replacement levels can increase up to 70%. The service life of structures using CEMGUARD® Fly Ash is enhanced by more than 100% on account of superior durability of concrete. Fly Ash use in concrete qualifies for credit under the U.S. Green Building Council's popular LEED® rating system for sustainable construction.
Applications of CEMGUARD® Fly Ash encompass structural and ready mix concrete, cement, plastering and brick mortar, pre-cast and pre-stressed concrete, pumped concrete, bricks and blocks. CEMGUARD® Fly Ash can either be pre-blended with the cement or sold separately for subsequent blending at the concrete batching plant. It is recommended that the volume of water may be reduced by 2.5% and quantity of sand may be reduced by 0.5% for every 10% of CEMGUARD® Fly Ash used instead of cement in concrete. Apart from the use of CEMGUARD® Fly Ash in blended cements or as a direct addition in concrete manufacture, CEMGUARD® Fly Ash may also be used as a raw material ingredient in clinker production where the silica and alumina contents are of particular interest. Non cementitious uses for CEMGUARD® Fly Ash are wide ranging and include use in roads, asphalt, soil and waste stabilisation, lightweight aggregates, etc. It can also be used to replace the filler ingredient of asphalt mix, which is usually 7-10%, leading to reduction in bitumen consumption by 10-15% resulting in a superior asphalt mix and cost-savings.
CEMGUARD® Microsilica (Silica Fume) is a by-product of producing silicon metal or ferrosilicon alloys in smelters using electric arc furnaces. It is a grey coloured powder, pozzolanic in nature. It is sourced from a single, dedicated factory in China and produced under strict quality control to maintain the highest levels of product consistency, and ensure minimum standard deviation. In concrete, it fills the space between cement grains - commonly referred to as particle packing or micro-filling. It also reacts with the calcium hydroxide from cement to form an additional binder called calcium silicate hydrate. Both these effects enhance the physical and chemical properties of concrete.
CEMGUARD® Microsilica is available in two dry powder forms - densified and undensified. Densified Microsilica is most popularly used in concrete construction. It is produced by tumbling undensified Microsilica particles in a silo, to form agglomerates with bulk densities between 500-700 KG/m3. Undensified Microsilica (bulk density between 200-350 KG/m3) is only used in specialized applications as it is not economical to transport because of its low bulk density. Quality-controlled and consistent Microsilica with uniform colour, and sourced from a single, dedicated factory is the key to maximizing its value in various applications. The production facilities of CEMGUARD® Microsilica have an in-house laboratory for testing of key parameters such as retention over SiO2 content, loss-on-ignition and moisture as per standard codes, while bulk density is controlled during the densification process.
CEMGUARD® Microsilica has unique properties that benefit both fresh and hardened concrete. Its key advantages include increased strength and durability as well as enhanced rheology of concrete. CEMGUARD® Microsilica can be used in concrete in two ways - as an addition (generally 8-15% by mass of cement) to enhance properties of the fresh and/or hardened concrete or as a partial cement replacement (5-10% by mass of cement) to maintain the 28-day compressive strength at lower cement content (with associated environmental benefits) while reducing the heat of hydration and improving durability.
Applications of CEMGUARD® Microsilica encompass shotcrete, high-strength & very high strength concrete, triple blend with fly ash, low-heat concrete, tunnels, marine & coastal, tall buildings, dams, floors & pavements, mortars & grouts and self-compacting concrete. It is also used to reduce cost of construction.
Kanoo Blue are exclusive agents for Jaycee range of products in the Kingdom Of Bahrain.Cemguard Flyash is currently approved by Materials Engineering Directorate of the Bahrain Ministry Of Works as a partial cement replacement product
For more Information click to http://www.jaycee.in/