Heavy density silica fume for cinema cement

heavy density silica fume for cinema cement:This Microsilica is commonly added to cement used in the construction of museums to increase its strength and other properties.In order to make more effective use of the Silica Fume to improve the microstructure of hardened cement paste, many researchers at home and abroad on the optimal application conditions of silica fume in cement paste and concrete to carry out a more detailed study, the research mainly includes the water cement ratio, silica fume mixing amount, admixtures, and the selection of other volcanic ash admixtures and their dosage, etc.. Silica fume in the application of cement paste and concrete in the existence of an optimal range of water cement ratio, generally exceeding the range, the silica fume on the hardened cement paste and concrete microstructure improvement effect will be reduced. As Gapparao pointed out, at the age of 3d or 7d of cement mortar, the strength of mortar specimens containing silica fume with a water-to-cement ratio of less than 0.45 (water-to-cement ratio of 0.35, 0.40) decreases, while the strength of mortar specimens containing silica fume with a water-to-cement ratio equal to 0.45 or 0.50 rises; however, at the age of 28d or 90d of cement mortar, mortar specimens containing silica fume with water-to-cement ratios of less than 0.35, 0.40 and 0.50 increase; but at the age of 28d or 90d, mortars with water-to-cement ratio of less than 0.35, 0.40 and 0.50 decrease. silica fume-containing mortar specimens have approximately the same strength; while the strength of mortar specimens containing silica fume (regardless of silica fume content) with a water-cement ratio equal to 0.45 is lower; when the water-cement ratio is equal to 0.50 and the silica fume admixture is greater than 27.5%, the silica fume has a significant effect on the strength development of the mortar in the late stage.