Concrete Aggregates: Effects and Classification

concrete aggregate

Aggregates: Effects and Classification Aggregates constitute a skeleton of concrete. Approximately three-quarters of the volume of conventional concrete is occupied by aggregate. It is inevitable that a constituent occupying such a large percentage of the mass should contribute important properties to both the fresh and hardened product. Aggregate is usually viewed as an inert dispersion …

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Cement Manufacturing Process

cement manufacture process

Cement Manufacturing Process History of Cement: Cement is a material which is highly compatible to the earth’s eco-system and most adaptable to sustainable development. Cement is a fine powder which sets after a few hours when mixed with water, and then hardens into a solid, strong material. Cement is mainly used to bind fine sand …

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Gap-graded Aggregate

ِِِِِAggregate particles of a given size pack so as to form voids that can be penetrated only if the next smaller size of particles is sufficiently small, that is, there is no particle interference. This means that there must be a minimum difference between the sizes of any two adjacent particle fractions. In other words, …

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Concrete Additives

concrete admixtures

Concrete Additives Concrete additives are fine materials which are generally added to concrete in significant proportions (around 5–20 %). They are used to improve or obtain specific fresh and/or hardened concrete properties. European Standards lists 2 types of inorganic concrete additive: Type I Virtually inactive materials such as lime fillers, quartz dust and colour pigments. …

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Recycled Concrete Aggregate

Recycled Concrete Aggregate

In a constantly evolving society there stems a need to develop and improve the current infrastructure. In order to build new infrastructure, building materials such as concrete will be needed. The raw materials needed for the aggregates and cements come from natural resources that do not get replaced. In the addition the energy needed to …

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Self-compacting Concrete: Fresh Properties

self-compacting concrete

Self-compacting Concrete: Fresh Properties Self-compacting concrete has specific fresh state properties which conventional concrete does not have. Fresh concrete properties of SCC are obviously related to its property of self-compactability. Self-compactability in mechanism terms is related to the rheology of fresh concrete. On the other hand, it is also related to workability parameters in terms …

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Concrete Admixtures

concrete admixtures

Nowadays concrete is being used for various purposes to make it suitable in different conditions. In these conditions ordinary concrete may fail to exhibit the required quality performance such as durability, strength, workability and finishing quality of concrete. In such cases, concrete admixtures are used to change the properties of the ordinary concrete so as to make it more suitable …

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Reinforcement Steel and Prestressing Tendons

Reinforcement Steel and Prestressing Tendons

Reinforcing Steel Because in prestressed concrete structures the role of primary reinforcement has largely been replaced by prestressing steel, an unfortunate tendency has been to denigrate the importance of supplementary conventional reinforcing. Conventional reinforcement fulfills the essential functions of distribution and resistance in the orthogonal directions to the prestressing, most typically in the transverse direction. …

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