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Feb 02, 2018 The additives are added to a water-cement mixture to increase the life of the concrete, control setting, and hardening and fix the general concrete behavior. They can be powdered or liquid additives. The additives can be added at the manufacturing point, or at the job site. Mar 09, 2021 Mineral additives make mixtures more economical, reduce permeability, increase strength, and influence other concrete properties. Mineral admixtures affect the nature of the hardened concrete through hydraulic or pozzolanic activity. Pozzolans are cementitious materials and include natural pozzolans (such as the volcanic ash used in Roman A2A: There are no additives which directly increase the strength of concrete. However, additives modify certain design mix requirements of concrete which in turn can result in increase in strength. There are various classes of additives used in co... Nov 04, 2019 Pozzolans are added to the concrete as an additive or as a substitution to the cement. Pozzolans, when used as a replacement, are generally substituted for 10 -50 % of cement. Pozzolans reduce the expansion causes by alkali-aggregate-reaction or alkali-silica reactivity in concrete. Weak tensile strength is also the reason concrete additives like fiber and potash are used to supplement concrete mixes. As such, it is as important to understand reinforcing materials as it is to understand concrete mix ratios. Essentials of Rebar. Rebar is the most common reinforcing material and provides the most strength in concrete. Retarders keep concrete workable during placement and delay the initial set of concrete. Most retarders also function as water reducers and may entrain some air in concrete. Accelerating admixtures increase the rate of early strength development, reduce the time required for proper curing and protection, and speed up the start of finishing
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