For several decades, in a constantly changing environment, admixtures have established themselves as an essential and essential component of modern concrete. Today, more than 95% of concrete is admixed. They are an essential catalyst for the technological development of concrete, both in terms of the properties in the fresh state of the concrete (ease and comfort of processing), and in terms of mechanical performance and resistance.
They constitute a valuable asset for the formulation of concrete adapted to their multiple uses and to guarantee the aesthetics of the facings and the durability of the structures. They are constantly evolving and have not finished surprising us.
Primary and secondary function
Each concrete admixture malaysia is defined by a main function, characterized by the major modification (s) that it brings to the properties of concretes, mortars or grouts, in the fresh or hardened state. The effectiveness of the main function of each admixture may vary depending on its dosage and the components of the concrete (cement, sand and fines in particular).
The performance of the adjuvants and the dosage ranges to meet the normal requirements are specified in the technical data sheets of the suppliers.
The performance of an adjuvant is judged with respect to its ability to be effective in its intended use (primary function) without producing damaging side effects.
An adjuvant in fact generally exhibits one or more secondary functions which are most often independent of the main function. Certain plasticizers have, for example, a secondary function of hardening accelerator.
Cumulative desired effects can be obtained by combining several adjuvants.
The effects of each adjuvant vary depending on its dosage. It is therefore essential, when using an admixture, to ensure, through preliminary tests representative of the conditions of construction of the site, of its effectiveness.
Admixtures are playing an increasingly important role in concrete technology. Their mechanisms of action are very complex, in particular for new generation adjuvants. Indeed, the action of an admixture depends on its dosage, the type of cement, its sequence of introduction into the mixer and the climatic conditions during the implementation of the concrete.
Each cement has its own behavior with respect to admixtures. When formulating a concrete for a given application, it is necessary to validate the adequacy between the cement, the admixtures and their respective dosages (cement-admixture compatibility study) and to optimize the cement-admixture couple.
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