3 results about "Apparent density" patented technology

The application discloses a manufacturing method of high-performance marine concrete. The method comprises the following steps: Step 1, weighing the following raw materials (by weight): 35-50 parts of cement, 9-15 parts of medium-coarse sand, 10-11 parts of crushed stone, 20-26 parts of blast furnace slag, 13-19 parts of coal ash, 2-5 parts of silica fume, 1.5-3 parts of a rebar corrosion inhibitor and 0.5-2 parts of a water reducing agent; Step 2, taking out medium-coarse sand and washing off dirt on the surface, taking out cleaned medium-coarse sand and airing to remove moisture; Step 3, taking all cement, putting cement into an agitator and stirring; Step 4, continuously adding crushed stone, blast furnace slag, coal ash and silica fume into the agitator, and uniformly stirring the mixture; Step 5, continuously adding the rebar corrosion inhibitor into the agitator, and adding a few amount of water; and Step 6, continuously adding the water reducing agent into the agitator, and stirring for 1 min so as to prepare the high-performance marine concrete. The concrete has low apparent density, strong corrosion resistance and good stability. By the use of lots of medium-coarse sand and crushed stone, apparent density of the concrete product is reduced. The product is applicable to severe environments such as a maritime environment.

The invention discloses a production method of a vanadium-nitrogen alloy, which comprises the following steps of: uniformly stirring and mixing a powdery vanadium-containing compound, a carbon reducing agent, a binder and a fluoride mineralizer; and performing compression moulding to obtain a regular mixture blank, wherein 138-146 parts of vanadium-containing compound, 43-49 parts of carbon reducing agent, 13-20 parts of binder and 1-5 parts of fluoride mineralizer by weight are mixed; putting the obtained mixture blank into a heat-resistant stainless steel container under the protection of nitrogen atmosphere and performing carbonization reaction pretreatment to obtain a pretreated product; putting the pretreated product into a resistance sintering furnace under the protection of argon or nitrogen atmosphere and performing further carbonization reaction treatment to obtain a treated product; putting the treated product into a nitriding furnace in nitrogen atmosphere and performing nitriding reaction treatment; and cooling and discharging to obtain a product of vanadium-nitrogen alloy. The method disclosed by the invention has a simple structure and short reaction time, and realizes high apparent density, stable quality and high nitrogen content of the product.