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Concrete additives
Concrete additives
Novakem concrete additives are used in concrete plants, companies specializing in the production and supply of ready-mix concrete through concrete mixing or batching plants where concrete is produced through the precise dosage of its materials: cement, aggregates, water, and additives. After production, the concrete is transported to the construction site by concrete mixer trucks; concrete plants may also offer concrete pumping services. They play an important role in the construction industry, ensuring the quality and efficiency in delivering the concrete needed for different types of construction.
O que é aditivo para concreto?
According to NBR 11768/2011, a concrete additive (chemical additive) is a product added to the mass of cementitious material during the concrete preparation process, in a quantity not exceeding 5% of the mass of the cementitious material contained therein, with the objective of modifying its properties in the fresh and/or hardened state.
Additives modify the rheological properties of concrete and/or alter the hydration reactions of cement. They can improve workability, modify viscosity, cohesion, modify water retention, accelerate or retard setting time, control the development of mechanical strength, contribute to the reduction of shrinkage, mitigate the consequences of sulfate attack, alkali-aggregate reaction and reinforcement corrosion, among other characteristics of concrete.
The main additives used in concrete plants aim to guarantee the workability of the concrete during production and transport , as well as to optimize costs. The most commonly used types are listed below.
Polykem™ water-reducing admixtures are multifunctional water-reducing admixtures added to concrete during its preparation . They increase the workability of the concrete and improve control over slump maintenance during transport to the construction site.
PKT™ (Polykem Turbo) water-reducing admixtures promote greater water reduction in ready-mixed concrete. They can act as neutral or retarding admixtures on the setting of concrete.
Superkem™ water-reducing admixtures are superplasticizing admixtures with high water reduction. Added to concrete during its preparation, they significantly increase the workability of the concrete and have no effect on the setting of the concrete.
Os aditivos redutores de água Hyperkem™ são aditivos superplastificantes com elevadíssima redução de água. Adicionados ao concreto durante sua preparação, aumentam muito a trabalhabilidade do concreto e podem ajudar no controle sobre a manutenção do abatimento e produção de Concreto de Ultra High Performance (UHPC). Não apresenta função secundária sobre a pega. Tem como base química em sua composição, principalmente os éteres de policarboxilatos.
Já os aditivos Hybrid K™ são conhecidos como aditivos Mid Range, que promovem redução de água superior aos aditivos polifuncionais usuais, podem ter como função secundária o controle sobre a pega do concreto. São utilizados principalmente em concretos especiais ou na produção de concretos de resistência característica, fck > 30 MPa.
Hydrakem™ hydration control additives serve to increase workability time and control the initial hydration reactions of cement in concrete transported over long distances, reused returned concrete, or stabilized mortars.
Para concretos projetados via úmida ou seca, o aditivo Jetkem™ isento de álcalis é um importante aliado na qualidade e produtividades destes concretos para tuneis, encostas e minas subterrâneas.
Depending on the type of construction or structure, achieving initial strength is fundamental for productivity and safety. Durakem™ accelerating additives guarantee greater concrete strength in the first few hours .
Airkem™ air-entraining admixtures are chemical agents developed for use in concrete and lightweight mortar that require controlled and stable air incorporation in both concrete and mortar.
Discover other Novakem™ products designed for use in concrete with concrete additives .
For more technical information, please contact our team of expert engineers.
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