Natural pozzolans affect several concrete properties in both fresh and hardened state. It improves the workability of concrete and increases its setting time. The reduction of concrete bleeding and segregation is one of the crucial benefits of natural pozzolans. It ...
Category: Concrete Admixtures
Admixtures are used to modify properties of concrete in fresh and hardened state. Articles on concrete admixtures are presented.
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How to Mix, Compact, and Cure Lime Concrete? [PDF]
Lime concrete is a composite mixture of lime as binding material, sand as fine aggregate, and gravel as coarse aggregate in appropriate proportions. Lime concrete mix ratio depends on the type of construction, but in general, it can be taken ...
How to Develop High-Early-Strength Concrete? [PDF]
High-early-strength concrete can be developed using ordinary concrete constituents, special admixtures, and certain concreting practices. The high-early-strength concrete, which is also called fast track concrete, gains its specified strength at an early age compared to ordinary concrete. The time during ...
7 Uses of Natural Pozzolans in Concrete Applications [PDF]
Pozzolans can be blended with lime (or Portland cement) to produce blended cements that can replace pure Portland cement commonly used in building materials such as concrete, masonry block, masonry mortar, bricks, and other construction units. Utilization of natural pozzolans ...
Shrinkage Reducing Concrete Admixture: Mechanism, and Applications
Shrinkage-reducing concrete admixture promote expansion of the concrete at about the same volume that normal drying shrinkage is contracting it. The net change in length of the hardened concrete is small enough to prevent shrinkage cracks. Shrinkage reducing concrete mixture ...
Water-reducing Set-retarding Admixtures: Affects, and Applications
Water-reducing and set-retarding admixtures are chemicals that slow down the initial reaction between cement and water by reducing the rate of water penetration to the cement and slowing down the growth of the hydration products. As a result, concrete stays ...
Corrosion Inhibiting Admixtures: Types, Dosages, and Applications
Corrosion inhibitors are admixtures that either extend the time to corrosion initiation or significantly reduce the corrosion rate of embedded metal, or both, in concrete containing chlorides in excess of the accepted corrosion threshold value for the metal in untreated ...
Functions of Admixtures in Fresh and Hardened State of Concrete
admixtures (singular or combination of admixtures) are added to concrete or mortar or grout mixture to achieve or improve desired properties in the fresh or hardened state. The admixtures are added to concrete based on their functions which they are ...