Ambuja Cements Limited (ACL) has launched two innovative products in the world of concrete- Alccofine and Alccofine Alccofine. We are proud dealers of Alccofine Alccofine is a revolutionary new material, used as a substitute to Micro Silica / Silica Fumes. This product is not. Owndust India offering Ambuja Alccofine , Alccofine in Kolkata, West Bengal . Get best price and read about company and get contact details and address.
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Skip to main content. Log In Sign Up. This results in denser pore structure and ultimately higher strength gain. This booklet presents results of examination carried out on ALCCOFINE in comparison with Laccofine Fume in concrete, and the effect it has on workability, water requirement, admixture requirement, strength and durability.
Such concrete suffer from two major weaknesses.
It is extremely difficult to obtained proper workability, and to retain the workability for sufficiently long period of time with such concrete mixes.
High dosage of high range water reducing agents HRWR then become a necessity, and resulting cohesive and thixotropic, sticky mixes are equally difficult to place and compact fully and efficiently. These problem indicate that there is probably a critical limit for the water content below which high HRWR dosage become not only essential but also unhelpful and undesirable, and often even harmful from a durability point 11203 view. In high performance concrete applications, Silica Fume is generally proposed as the appropriate cement extender where high strength, low permeability are the prime requirements.
Ambuja Cement introduces Alccofine and for concrete industry
ALCCOFINE is a specially processed product based on slag of high glass content with high reactivity obtained through the process of controlled granulation. The raw materials are composed primary of low calcium silicates. The processing with other select ingredients results in controlled particle size distribution PSD. Sukerkar Mansion, First Floor, M. Physically the product is unique with regards to its particle size distribution. High range water reducers HRWR are extensively used to ensure placement with low water contents.
The presence of extremely fine particles decreases the permeability and improves durability.
Ambuja Alccofine , Alccofine – Owndust India, Kolkata | ID:
Crushed Basalt rock was used as coarse aggregate and local river sand was used as fine aggregate. These materials used were dried completely before using.
Due to its unique particle size distribution and inbuilt CaOALCCOFINE results in to formation of dense pore accofine, which results in improved workability, workability retention and compressive strength at all ages. In this methodology, the binder content and admixture content were kept constant and the outcome on water requirement, workability and compressive strength were measured. The decrease in water demand is because of high glass content which has water repelling property.
Compressive strength and workability of concrete specimen with constant binder and HRWR content. The results are similar even in other two methodologies.
ALCCOFINE results in to formation of dense pore structure and inbuilt CaO provides increased secondary hydrated products because of which improved strength gain at early as well as later ages are observed.
Secondary hydrated products formed due to pozzolanic and Cementitious hydration reaction fills the pores. This reduces the permeability of hydrated products to great extent and protects concrete from chemical attack. Under durability water permeability and chloride penetration were measured most commonly.
Engineers are, by nature, fascinated and indeed obsessed, by high strength and very high strength concrete. Misconception is widely-held that high strength concretes are, per se, highly durable.
The impetus for higher and higher concrete strengths also came from demands for exceptional increases in the height of high-rise buildings and for long span bridges. Such concretes generally suffer from two major weaknesses i. Thus concept of strength through durability become essential.
Chloride ion penetration is the most frequently specified durability criterion for a long term service life of concrete structures.
Title of ASTM C ASTM C says that this test method is applicable to types of concrete where correlations have been established between this test procedure and long term chloride penetration by ponding method.
Packing effect retards ingression of aggressive agents in concrete even by diffusion and thus enhances durability of concrete. According to this test the cubes were initially water-cured for 28 days, and then exposed to water pressure of 5 bars for 72 hours after which the cube was divided and the depth of water penetration measured.
Penetration of less than 25 mm is generally considered to be impermeable concrete.
This refines the concrete microstructure and enhances the degree of impermeability and the strength characteristics of concrete. The slabs used were water cured for 28 days.
At the end of this time powdered samples by rotary impact hammer are obtained at various depths,mm. Chloride content of the sample from each depth were determined and reported. Thus, it reduces the penetration of chlorides in concrete and protects embedded steel from corrosion. Denser pore matrix restricts chloride penetration and alkalinity forms passive layer on steel and protect it from corrosion. These trials results shown following benefits: Durability test measuring the water permeability showed better results than the Silica Fume.
In spite of its high fineness it does not increase water demand at the dosage range of 5 to 15 percent of normal OPC in general. In fact concrete slump is seen to be improved, due to the dense packing of cementitious material, producing low void content.
Strength development increases drastically at early ages and the later on strengths are higher compared to traditional supplementary cementitious material due to its unique PSD. Remember me on this computer. Enter the email address you signed up with and we’ll email you a reset link. Click here to sign up. Help Center Find new research papers in: