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Supplementary Cementitious Materials (SCM) are added to concrete mixtures for various reasons including improving durability, decreasing permeability, aiding in pumpability and finishability, mitigating alkali reactivity and improving the overall hardened properties of concrete through hydraulic or pozzolanic activity or both. SCM are added to concrete in addition to or as a partial replacement of Portland cement or blended cements and…

Quality tests on cements at construction site (also called field tests on cement) are carried to know the quality of cement supplied at site. It gives some idea about cement quality based on colour, touch and feel and other tests. The following are the quality tests on cement at construction site: - Color test - Presence of lumps - Adulteration…

Microsilica can be used in gypsum products as a process aid, to improve ingredient dispersion and to improve hardened properties and overall durability, particularly in fire tests. Microsilica Grade 920 is a dry silica fume available in two main forms: Undensified (U) and Densified (D). Microsilica Grade 920 is a dry silica fume available in two main forms. Undensified and…

Micro silica is an amorphous type of silica dust mostly collected in bag house filters as by-product of the silicon and ferro-silicon production. The paper summarizes important physical and chemical properties of micro silica and uses those results for an evaluation of micro silica from a Health Safety and Environment (HSE) standpoint. Micro silica consists of spherical particles with an…

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First, micro silica powder is collected. When the equipment running resistance or time of the micro silicon powder manufacturer reaches the set value, the unloading process begins. The process of cleaning silica fume is realized by using the negative pressure of the front part of the main fan. Then, the waste gas is purified. The flue gas from the EAF…

Micro silica loose powder parameter: Silicon Dioxide (SiO2): 85 to 96 % Moisture Content: Maximum 2.0 % Loss on Ignition (LOI): Maximum 2.0 % Oversize percent retained on 45-μm (325 sieve): Maximum 2 % Specific Surface: Minimum 18 m2/g Density: 250 to 700 kg/m3 (Densified Silica Fume and UnDensified Silica Fume) Packing: 900kg Jumbo bag net weight 500kg Jumbo bag…

Silica fume bulk specific gravity: 200kg/m3 True density: 2.2g/cm3

Silica flour (quartz sand, silica powder), is a hard, wear-resistant, stable chemical properties silicate minerals, its main mineral composition is SiO2, quartz sand color is white, colorless or translucent, 7 hardness, brittle cleavage, conchatus fracture, oil sheen, density 2.65. The bulk density (20-200 for 1.5), the chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in…