Is silica fume environmentally friendly


The partial substitution of silica fume instead of cement has multiple environmental advantages: reducing pollution due to its release in nature, conserving energy and natural resources, decreasing greenhouse gas emissions, and enhancing microbial carbonate precipitation, which leads to more sustainable concrete. Silica fume is one of the most popular pozzolanas, whose addition to concrete mixtures results in lower porosity, permeability, and bleeding because their oxides (SiO2) react with and consume calcium hydroxides produced by the hydration of ordinary Portland cement. Adding 7.5 percent silica fume, for a total of 15 percent silica fume by weight of cement, can produce a 28-day compressive strength of 10,300 psi (71 MPa). Silica fume is abundant and about 40% cheaper than other materials, such as Portland cement. Unidentified silica fume is more expensive because of its larger size and higher transportation costs. The main advantage of densified silica fume is to save on transportation costs. Silica fume is a by-product of producing elemental silicon or alloys containing silicon in electric arc furnaces. At approximately 2000°C, reducing high-purity quartz to silicon produces silicon dioxide vapor, which oxidizes and condenses at low temperatures to produce silica fume. Fumed silica and silica fumed are two different terms for two substances. They are both silica dioxide. On some occasions, people are confused with them. They have different derivations, technical characteristics, and applications, and the price differs. The surface of the untreated fumed silica contains a lot of hydroxyl groups, causing extremely hydrophilic behavior. So it could absorb water easily, linked to the particles via hydrogen bonds. If you are looking for high quality, high purity, and cost-effective Fumed silica, or if you require the latest price of Fumed silica, please feel free to email contact mis-asia.

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