5results about How to "Small drying shrinkage" patented technology

The invention discloses a preparation method of an all-solid-waste building material, which comprises the following steps: S1, raw materials of the all-solid-waste building material comprise steel slag, lithium slag, carbide slag and water according to a mass ratio of (11-13): (4-6): 1: (2-4); s2, uniformly mixing and stirring the raw materials in the S1, casting and molding, curing for 2-3 days in an environment with the temperature of 15-25 DEG C and the humidity of 45-55%, and demolding; and S3, after demolding, carrying out carbonization maintenance in an environment with the temperature of 15-25 DEG C and the humidity of 45-55% to obtain the all-solid waste building material. According to the all-solid-waste building material and the preparation method thereof, the steel slag, the lithium slag and the carbide slag are adopted as raw materials, the building material with the strength reaching up to 30 Mpa is prepared, it is guaranteed that the compressive strength is not smaller than 24.3 Mpa, meanwhile, it is guaranteed that the drying shrinkage rate is smaller than 0.29%, the sulfate erosion resistance expansion rate is smaller than 0.07%, and the all-solid-waste building material can replace baking-free bricks to be used in buildings.

A water-reducing agent for coal-based solid waste concrete and its preparation method are disclosed. The water-reducing agent comprises 40-60 parts of a polycarboxylate-based main agent, 15-25 parts of a slump retainer, 10-20 parts of a crack-resistant reinforcing agent, 5-10 parts of a dispersing agent, 2-5 parts of a stabilizer, and 10-20 parts of deionized water. The slump retainer is a modified polyetheramine prepared by block copolymerization of ethylenediamine with ethylene oxide and propylene oxide; the crack-resistant reinforcing agent is a composite of nano-calcium carbonate and modified lignin sulfonate. This invention reduces the adsorption loss of the water-reducing agent by coal-based solid waste particles through the synergistic effect of the polycarboxylate-based main agent and the modified polyetheramine slump retainer, achieving a slump loss rate of ≤15% after 2 hours. The nano-calcium carbonate fills interfacial voids, and the modified lignin sulfonate alleviates hydration thermal stress, resulting in a lower 28-day drying shrinkage rate and higher crack resistance of the concrete. This invention solves the problems of poor adaptability, short slump retention time, and insufficient crack resistance of traditional water-reducing agents in high-volume coal-based solid waste concrete.

The application discloses a cement aerogel material with micro-expansion and shrinkage inhibition and a preparation method thereof. The cement aerogel material is prepared by mixing, foaming, pore forming and drying of a first component, cement and a second component. The first component comprises a hydrogel polymer, an expansion component, water and a dispersing agent. The second component comprises a foaming agent. The weight ratio of the hydrogel polymer, the expansion component, water and the cement is 0.08-0.3:0.04-0.3:8-15:1. By introducing the expansion component with a proper proportion, the expansion component expands, the intermediate-state skeleton strength is improved, and the shrinkage is resisted. The expansion volume is not less than the shrinkage volume in the drying process, the drying shrinkage is effectively offset, the overall structure integrity is maintained, and finally an additional active reinforcement effect is generated.

The invention discloses fiber-reinforced solid waste-based concrete and a preparation method thereof, and relates to the technical field of concrete and concrete preparation, the fiber-reinforced solid waste-based concrete is composed of 100 parts of cement, 1 part of short fiber, 250-350 parts of fly ash, 0.8-1.2 parts of rubber powder and 32 parts of water, and the fiber-reinforced solid waste-based concrete is prepared by the method comprising the following production steps: mixing, pulping and molding. According to the invention, 250-350 parts of fly ash is adopted, and the fly ash accounts for 71.4-77.8% of the total amount of the cementing material, which is far higher than the mixing amount lower than 30% in conventional concrete. The utilization rate of the industrial solid waste is greatly improved, and the use amount of the cement is remarkably reduced, so that the energy consumption and carbon dioxide emission in the production process are reduced, and the method has outstanding green and environment-friendly values and economic benefits.

The application discloses a light autoclaved aerated concrete block and relates to the technical field of concrete blocks.The light autoclaved aerated concrete block comprises the following raw materials: cement, lime, base material, modified palygorskite, calcium sulfate dihydrate, aluminum paste, foam stabilizer and deionized water.In the application, the fibrous structure of the modified palygorskite can form a network framework in the slurry, fill the internal pores and block the capillary channels, so that the overall structural compactness and surface strength of the block are improved, and the drying shrinkage and water absorption are reduced.The alkyl benzene sulfonic acid sodium in the foam stabilizer can reduce the surface tension of the slurry and promote the generation of a large number of bubbles.Nano silicon dioxide can form a rigid support framework in the bubble liquid film to prevent the bubbles from merging or breaking.Polyvinyl alcohol forms an elastic protective film on the bubble surface, prolongs the bubble life, greatly improves the block closed porosity, guarantees the light weight of the block, reduces the drying shrinkage due to the uniformity of the pores, and improves the impermeability and overall strength.