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Doseong Co., Ltd. was established to handle the land, conserve water, save the environment and ultimately conserve humans. There is a founding approach of Dooseong that contributes to the nation, makes the nation and mankind healthy by utilizing the extremely unique resource (Ge-lite) that God has gotten ready for our people in the 21st century.

Pozzolans are silicate-based materials that react with (consume) the calcium hydroxide generated by hydrating cement to form extra cementitious products.

The Use Of Pozzolans In Concrete:

Why is consuming calcium hydroxide a good thing? Calcium hydroxide (lime) accounts for approximately 25% of the hydrated Portland cement, and lime does not contribute to the concrete’s strength or resilience. Pozzolans integrate with the lime to produce additional calcium silicate hydrate, the product accountable for holding concrete together. By consuming the excess lime:

The strength of the concrete is increased

Its density is increased

Efflorescence is reduced

The propensity for alkali-silica reaction (reaction with glass) is reduced, and even virtually eliminated

Normally pozzolans are utilized as cement replacements rather than cement additions. Adding pozzolans to an existing concrete mix without getting rid of an equivalent quantity of cement increases the paste content and reduces the water/cement ratio. In other words, including more pozzolans to a mix alters the mix percentages. Changing a few of the cement with pozzolans protects the mix proportions. Pozzolans change cement pound for pound.

Depending upon the particle size, chemical structure and dosage, various pozzolans will affect the concrete strength differently and at various times throughout curing. Numerous pozzolans are waste items from commercial procedures. Fly ash comes from coal-fired power plants, and silica fume and slag originates from some steel refineries. As such the color, quality, gradation and properties can vary and are not managed.

VCAS and metakaolin are actively made pozzolans. Quality, color and other characteristics can be controlled, so product consistency is greater. There might also be different grades offered. The majority of pozzolans are utilized separately, however blends of 2 or more different pozzolans can be used to benefit from the qualities each pozzolan uses. Case in points are fly ash and silica fume blends, where the fly ash increases workability and particle packaging and the silica fume helps with early strength and total strength development.