Roads of metallurgical enterprises have a large number of reinforced concrete structures. Within these plants, every day they need to complete a lot of raw material and fuel transport, lifting and storage. And the transshipment, lifting, storage of these original fuel needs support from concrete structures. Daily load of the concrete structure is great. It inevitably causes the damages in transporting, loading, storage of raw material and fuel. Once surface of the reinforced concrete structure is damaged, the bare steel bar will leak out, over time it will be oxidized to rust. It will affect the entire structure, even affect the safety of the entire concrete structures. So the quickly repair of damaged surface of concrete and achievement of the intensity are particularly important. Otherwise it will affect the normal production of metallurgical enterprises.

The concrete patching material is used in the repair of damaged concrete surface of a material of construction, repair materials, objective standards, it has a high early strength, excellent durability, good surface finish. What is the most concrete repair material with fly ash or blast furnace slag, fly ash and blast furnace slag content concrete repair material also, it will reduce the initial resistance of concrete repair materials and reduce its wear resistance, ineffective, but does not fit the actual situation of metallurgy company, currently, people in repair compound is mixed with silica powder for the study is relatively small, metal powder exporter ‘s demand is increasing for concrete repair materials, which require higher early strength, but also required for construction also requires a good surface. Number of experiments confirmed that silica can increase the number of properties of concrete repair material, mixed with silica powder of the repair material to meet the needs of the concrete repair material much more stringent of microsilica in the implementation of repair materials.

The mortar or concrete, cement paste filling, silica fume cement paste number of holes with significantly reduced the like is increased, while the total porosity was almost unchanged. Suspension and microsilica total interfacial transition zone, to reduce bleeding of the mortar or concrete to prevent moisture from collecting around the area of ​​the aggregates after the transfer interfacial microstructure and the cement paste, which improves the filter area of ​​the interface and density to reduce the thickness of the interface effective filter area, powder particles of the silica micro-CH seeds, small crystals of CH, the more random orientation.
Therefore, inclusion of fumed silica improves the bond strength of mortars or concrete, cement paste and aggregates, eliminate the "weak link" of the various components in the composite concrete, mortar or concrete, properties of composite materials. Bone particles in the mortar or concrete play a major role, not just an inert filler. Silicon powder can improve the impact strength of the cement paste is not too large, but this may be the same water-cement of the concrete strength is considerably higher than the resistance of the matrix array).

By adding 5% silica fumes in concrete repair materials, it can reduce both the patch material and increase mobility. It is more favorable to the development of the site. Represented by a mixture of mortar repair of 5% by weight of fumed silica cement can improve the flexural strength of the repair mortar about 20% to 30% may increase the compressive strength of about 10% to 30%. Silica fume can increase the mobility of the repair service is the repair mortar surface is smooth and beautiful. Mixed formulations of concrete repair material, fused silica is applied to field analysis of iron storage and lots of factories great road repairs properly, so that the concrete floor of the courtyard and main roads, the fracture surface ground steel time an effective life of the repair, the service as the original has almost doubled. Source:http://www.mhcmp.com