How to use silica fume in aluminum magnesium spray supplement?
Aug 20, 2024
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1, the amount of silica fume
(1) Blending: under the premise of the same amount of water added, 1 part of silica powder can replace 3-5 parts of cement (weight) and keep the compressive strength of aluminum magnesium spray supplement unchanged to improve other properties of aluminum magnesium spray supplement.
(2) Mixing: the amount of cement is unchanged, and the addition of silica fume significantly improves the strength and other properties of Al-Mg spray supplement. There is a certain slump loss when the aluminum-magnesium spray supplement is mixed with silica fume. This should be noted in the mix ratio test. Microsilica powder must be combined with water reducing agent. It is recommended to add fly ash and fine slag to improve its workability.
(3) Weight ratio with gel material: When preparing aluminum magnesium spray supplement with silica fume, the weight ratio with cementing material is generally: high performance concrete is 5-10%; Hydraulic concrete is 5-10%; Shotcrete is 5-10%; Pump aid is 2-3%; Wear-resistant industrial floor is 6-8%; Polymer mortar, thermal insulation mortar: 10-15%; The amorphous refractory castable is 6-8%. Before use, please select a reasonable and economical dosage according to the actual needs through the experiment.
2. Adding method of silica fume
silica fume aluminum-magnesium spray supplement should be made by the laboratory construction mix. Construction in strict accordance with the mix ratio. In the mixing of silica fume aluminum-magnesium spray feed, silica fume should be added to the mixer immediately after the aggregate feeding. There are two kinds of procedures for joining:
(1) Put in aggregate, then put in silica fume, cement dry mix, and then add water and other admixtures.
(2) Put in coarse aggregate +75% water + silica fume +50% fine aggregate, stir for 15-30 seconds, and then put in cement + admixture +50% fine aggregate +25% water, stir until uniform. The stirring time is 20-25% or 50-60 seconds longer than that of ordinary aluminum-magnesium spray supplement. Do not add silica powder to the mixed Al-Mg spray feed.
According to the effect of silica fume on the properties of Al-magnesium spray supplement, it can be predicted that the wet spray supplement with lower silica fume content will show better erosion resistance and spalling resistance, and thus have a longer service life. silica fume should be strictly operated in accordance with the relevant construction specifications of concrete engineering, but because silica fume is light, it is strictly prohibited to throw materials at high altitudes to prevent silica fume from flying. Anyang Jiashike Metal Co.,Ltd. production and development of high-quality silica fume (micro silica powder), the production of silica fume particles, good performance, widely used, welcome to leave a message or call consultation.
