35results about How to "No shrinkage cracks" patented technology

The invention provides a method for repairing a casting mold, the steps of which are: 1) cleaning the parts to be repaired of the wooden, aluminum or steel casting molds to be repaired, and wiping them with alcohol; Choose a specific repair method for the size of the part: when the largest size of the part to be repaired is not less than 10mm, first pre-fill with the back layer repair material, and then coat the surface layer repair material after the back layer material is hardened; otherwise, directly Coating and repairing with surface repair materials; 3) Repairing the repairing layer of the casting mold after coating and repairing with manual electric grinding and polishing equipment, so that the size of the repairing layer meets the size requirements of the casting mold, and the surface of the repairing layer Grinding smooth and flat until the roughness is not less than 0.8Ra level, that is, the repair of the casting mold is completed. The invention has the advantages of simple process, low repair cost and short repair period, and is suitable for repair requirements of casting molds made of various materials such as wood, aluminum or steel.

The invention relates to a cement wood-wool acoustic board. The cement wood-wool acoustic board comprises the following components in parts by mass: 100 parts of magnesia, 60-100 parts of water, 30-50 parts of magnesium chloride, 50-80 parts of wood-wool, 20-70 parts of ferrous sulfate, 1-25 parts of a reinforcing agent, 1-10 parts of a heat enhancer, 5-8 parts of a filling agent, 0.1-5 parts of titanium pigment and 1-10 parts of a foaming agent. The cement wood-wool acoustic board is excellent in water resistance, corrosion-free and acid-alkali-resistant, cannot generate shrinkage cracks, has a good heat preservation effect, is resistant to ultraviolet irradiation, and cannot deform easily after moisture absorption; the heat conductivity of the product is 0.1-0.15, the compressive strength is 0.2-0.4Mpa, the acoustic absorption coefficient is up to 0.5, the water absorptivity is 0.8-0.9, the density is 0.9-1.5, and the cement wood-wool acoustic board can be self-distinguished in 5 seconds, so that the cement wood-wool acoustic board can be widely used and continuously replace the existing materials.

The present invention relates to a method for constructing a bobsleigh course using a high-performance wet-type shotcrete composition, and more particularly, to a method of constructing a bobsleigh course that uses a high-performance wet-type shotcrete composition which includes silica fumes and AE material, and which has increased pumpability prior to being deposited due to the presence of a superabundant amount of air, and increased shootability after being deposited since the amount of air present is decreased, thus imparting high constructability, high strength, and high durability to the composition. To this end, the method comprises: a framework-forming step of fixing a wire-mesh formwork, positioning a cooling pipe, strengthening adherence and holding strength, and installing a curvature-maintaining pipe; a shotcrete-laying step of laying the shotcrete composition; a first surface-finishing step of setting a curved surface and performing finishing using plastering; a second surface-finishing step of performing a rough surface finishing; and a wet curing step of performing wet curing.

The invention relates to a polymeric cement gravity flow leveling material prepared from silicate cement, polymer emulsion powder, high-alumina cement, mineral blending materials, high efficiency water reducing agent, defoaming agent, and quartz sand and with right weight ratio through finite process, material possesses good mobility, stability, high early stage folding and compression resistant strength, thus can be widely applied in ground surface leveling and mending of old ground surface, sand streak ground surface and ground surface with less qualified construction.

The invention provides a road pavement base paving method, which uses a special curing agent PCSB, mixed with waste powder recovered from asphalt concrete mixing stations, coarse and fine aggregates in a certain proportion, and mixed with water to pave the pavement base. The invention uses PCSB curing agent to consolidate asphalt waste powder materials, and paves the pavement base, which can reach a strength of more than 6.0 MPa, without cracking, simple construction technology, and no manual sawing, which ensures high strength, good integrity and stability of the pavement base Well, at the same time reduce the cost of road works.

The application relates to the field of sleepers, and specifically discloses a resin concrete sleeper. The resin concrete sleeper includes the sleeper body, the sleeper body is provided with steel bars, and the sleeper body is formed by solidification of the resin concrete material, and the resin concrete material is mixed by raw materials containing the following parts by weight: 15-25 parts of epoxy resin, 10-25 parts of powder Material, 35-50 parts of aggregate, 3-6 parts of reactive diluent, 3-5 parts of toughening agent, 5-8 parts of other additives, 5-8 parts of fiber. The resin concrete sleeper of this application uses epoxy resin instead of cement as the cementitious material in the concrete, the epoxy resin reacts with the curing agent to realize gelation, the solidification shrinkage is small, the drying shrinkage cracks are few, and the mechanical properties are good. Compared with ordinary High-strength concrete has the advantages of high strength and low density, which can achieve lighter weight and facilitate construction. At the same time, epoxy resin sleepers have better elasticity, which can effectively buffer and conduct rail vibration, reduce ballast pulverization, and reduce sleeper fatigue. sink.

The objective of the invention is to provide a pavement base structure of a road. The pavement base structure comprises a base and a subbase. The pavement base structure is characterized in that the subbase comprises, by mass, 2 to 7.5% of a PCSB curing agent, 15 to 28% of waste asphalt powder, 35 to 50% of fine aggregate and 25 to 40% of coarse aggregate (summing to 100%); and the base comprises,by mass, 2.5 to 8% of the PCSB curing agent, 18 to 30% of waste asphalt powder, 35 to 50% of fine aggregate and 25 to 40% of coarse aggregate (summing to 100%). The pavement base structure can reduceshrinkage cracks, improve the quality of a pavement base and lower engineering cost for the road.