9results about How to "Short setting time" patented technology

This invention discloses a method for solidifying arsenic using copper slag. The method involves adding arsenic-containing substances to copper slag, mixing it thoroughly, adding a sulfuric acid solution with a mass concentration of 10-25%, stirring evenly at room temperature, molding, demolding, and curing to achieve the purpose of solidifying arsenic. This invention utilizes the chemical reaction between copper slag and sulfuric acid solution to harden the material, thereby generating strength. When used as a casting material, it not only has the characteristics of fast setting time, good stability, and good durability, but also has excellent adhesion, realizing the comprehensive utilization of industrial waste.

The application discloses an ultra-high performance concrete for reinforcing an existing structure and a preparation method thereof. The ultra-high performance concrete for reinforcing the existing structure is composed of the following components in parts by weight: 370-500 parts of Portland cement, 340-560 parts of self-stress sulphoaluminate cement, 80-150 parts of silica ash, 80-120 parts of composite admixture, 0.24-0.4 parts of lithium salt, 5-8.4 parts of composite retarder, 900-1150 parts of quartz sand, 160-220 parts of steel fiber, 27-36 parts of water reducing agent and 142-192 parts of water. Compared with a traditional UHPC, the ultra-high performance concrete has the advantages of short setting time, high hourly strength, strong anti-interference performance and certain micro-expansion, can be self-compacted and free-vibrated after being poured in a narrow space between an existing structure and a formwork, can match a reinforcing construction window period, has high hourly strength after setting and hardening, plays a good anti-dynamic-load-disturbance-cracking role in the construction without interrupting traffic, and has appropriate expansion, so that the adhesion between the outer layer and the existing structure is further improved, the two are more closely combined, and the reinforcing effect is better.

The present application relates to the technical field of 3D printing concrete, and discloses a preparation method of 3D printing concrete mixed with plant fibers, which comprises the following steps: step 1, soaking and drying the plant fibers treated with water glass in saturated limewater; step 2, blending the plant fibers with sulphoaluminate cement; step 3, preparing alkali-activated 3D printing concrete and pumping it by taking 30-50 parts of water glass, 20-40 parts of sodium hydroxide, 100-200 parts of limestone powder, 1000-1200 parts of sand, 100-200 parts of extra-fine sand, 400-500 parts of mineral powder, 50-150 parts of rice husk ash, 20-40 parts of hydroxypropyl methyl cellulose, 220-300 parts of water and 5-10 parts of water reducing agent according to mass fraction; step 4, forcibly stirring the concrete and adding the product obtained in step 2; and step 5, printing the concrete and spraying a setting agent between the concrete layers. The present application helps to improve the constructability of 3D printing concrete and reduce its shrinkage.

This invention discloses a phosphorus slag-based cementitious material, its preparation method, and its application, specifically relating to the field of cementitious materials technology. The cementitious material, by weight, comprises the following components: 60-90 parts phosphorus slag powder; 5-25 parts fly ash; 5-15 parts activator; 0.25-1.5 parts early-strength agent; and 0.2-0.5 parts water-reducing agent; wherein the specific surface area of ​​the phosphorus slag powder is 400-550 m². 2 / kg, particle size (D) 90 The particle size is 20-40 μm; the early-strength agent is selected from at least one of iron salts and aluminum salts. This invention uses phosphorus slag micro-powder with a specific specific surface area as the main substrate, with a high dosage, combined with fly ash, activator, early-strength agent, and water-reducing agent to obtain phosphorus slag-based cementitious materials. By optimizing the physical properties of the phosphorus slag micro-powder and constructing a suitable composite activator-early-strength system, the 28-day compressive strength of the cementitious material reaches over 61.0 MPa, achieving a balance between "high phosphorus slag content" and "high strength".

The application relates to the technical field of soft soil solidification, in particular to a grouting material for a high-water-content silt rapid solidification process and a use method, which comprises 42.5-grade cement, blast furnace slag powder, gypsum, a quick-setting agent, polyvinyl alcohol, aluminum sulfate, polyacrylamide and a water reducing agent; according to the mass fraction, the 42.5-grade cement is 60-70%, the blast furnace slag powder is 20-30%, the gypsum is 2-5%, the quick-setting agent is 3-5%, the polyvinyl alcohol is 0.3-0.7%, the aluminum sulfate is 1-2%, the polyacrylamide is 0.5-1‰, and the water reducing agent is 1-2‰. The grouting material utilizes the early-strength rapid solidification principle of geopolymer materials, and combines various materials such as the quick-setting agent to regulate the hydration rate, so that the silt stratum can be rapidly disposed.

The application provides a kind of improved sulphate saline soil road base road building material and preparation method, the improved sulphate saline soil road base road building material includes the following raw material components: by mass percentage, steel slag 1~3.45%, fly ash 1~3.45%, cement 0.55~1.77%, sodium hydroxide 0.54~1.7%, water 1.68~6.38% and sulphate saline soil 83.25~95.23%, the mass percentage of each component is 100%, and the preparation method includes: step 1, the formula amount of steel slag, fly ash, cement is dried and then ground and mixed, then mixed with the formula amount of water and stirred uniformly to prepare mixed liquor A; the formula amount of NaOH is prepared to obtain 10mol / L NaOH solution; step 2, mixed liquor A and the NaOH solution prepared in step 1 are mixed to prepare geopolymer; step 3, the geopolymer is mixed with the formula amount of sulphate saline soil to obtain the product. The improved material provided by the application has the characteristics of good low-temperature resistance, strong anti-freeze-thaw cycle ability, good impermeability, small expansion, good volume stability, and high mechanical properties of the reinforced soil body.

This invention proposes a solid waste-based grouting material for road repair and its preparation method, belonging to the field of comprehensive utilization technology of solid waste. The solid waste-based grouting material for road repair comprises, by weight, 20-40 parts of waste concrete fine powder, 10-40 parts of fly ash, 30-80 parts of blast furnace slag, 10-30 parts of red mud, 15-25 parts of waste iron filings, 20-33 parts of titanium slag, 3-8 parts of early-strength agent, 2-4 parts of water-reducing agent, 5-6 parts of expansion agent, and 1-4 parts of composite admixture. The titanium slag and waste iron filings are mixed, then hydrochloric acid is added, followed by aeration and heating aging to obtain filtrate and filter residue. The filter residue is mixed evenly with the remaining raw materials, and then water and filtrate are added to obtain the grouting material. The grouting material of this invention has the advantages of short setting time, excellent mechanical properties, corrosion resistance, and freeze resistance, while simultaneously solving the problem of low recycling efficiency of industrial and construction solid waste.

The present application relates to the field of subgrade soil treatment, and particularly relates to a subgrade in-situ soil high-performance ecological enhancer, a preparation method and a construction method, the enhancer comprising the following raw materials in percentage by mass: sulphoaluminate cement 45-85%; Portland cement 8-25%; quicklime 3-5%; fly ash 0-15%; silica fume 0-8%; slag powder 0-15%; sodium sulfate 3-5%; sodium silicate 0-2%; lithium carbonate 0-0.8%; polymer enhancer 0-1.5%; silicone powder 0-1.5%; sodium lignosulfonate 0.1-0.3%. The enhancer effectively combines the advantages of sulphoaluminate cement and Portland cement, combines other components, has the characteristics of rapid setting and fast early strength development, can regulate soil strength, meets the requirements of compressive strength and durability in engineering construction, shortens the construction period, and meets the demand of 4-6h rapid traffic under the scene of emergency repair.

The application discloses a kind of gradient hierarchical utilization garbage incineration bottom ash preparation's zero clinker ultra-high performance concrete and its preparation method, including following weight parts raw materials: garbage incineration bottom ash 660-700 parts;Mineral powder 460-500 parts;Silica fume 35-45 parts;Fine quartz sand 380-420 parts;Activator 370-380 parts;Modifier 15-17 parts;Steel fiber 110-130 parts.Garbage incineration bottom ash includes following particle size and weight parts garbage incineration bottom ash: 8 μm below garbage incineration bottom ash 35-45 parts;8-40 μm garbage incineration bottom ash 75-85 parts;40-150 μm garbage incineration bottom ash 150-170 parts;150-500 μm garbage incineration bottom ash 380-420 parts.The application cooperates and utilizes garbage incineration bottom ash, mineral powder and silica fume, and does not use Portland cement as UHPC cementing material raw material, and UHPC preparation cost and carbon emission are greatly reduced.