40results about How to "Improve anti-shrinkage performance" patented technology

The invention provides a sulfur fixation ash-fly ash compounded environment-friendly void grouting material as well as a preparation method and application thereof. The void grouting material is prepared from sulfur fixation ash, fly ash, a curing agent, an early strength agent, a water reducing agent, a defoaming agent, an expanding agent and water. In terms of performance, the strength of the grouting material can be adjusted and controlled by adjusting the proportion of the sulfur fixation ash, the fly ash and the curing agent in the formula; through the contents of the auxiliary agent andthe curing agent, the characteristics of high early strength and short curing time can be realized. Meanwhile, industrial solid wastes such as the sulfur fixation ash and the fly ash are adopted, so that the development requirement of China on environmental protection is met. Compared with a common cement-based grouting material on the market at present, the grouting material disclosed by the invention has the advantages of no air shrinkage phenomenon after being cured, capacity of keeping volume micro-expansion and excellent air shrinkage resistance. The cost of the disclosed grouting material is less than 180 yuan / m<3>, the cost performance is greatly improved, and the disclosed grouting material has great economic and social benefits.

The invention relates to a method for preparing geopolymers by taking stone coal vanadium extraction tailings as main raw materials. The technical scheme is as follows: the method adopts the following raw materials in percentage by weight: 55-76% of stone coal vanadium extraction tailings, 1-5% of hydrated lime, 0.3-2% of anhydrous sodium sulfate, 10-16% of metakaolin, 6-10% of sodium hydroxide and 6-13% of silica fume. The preparation method disclosed by the invention comprises the steps of firstly, uniformly mixing the stone coal vanadium extraction tailings and an activating agent, standing, calcining, and performing mechanical vibration milling to obtain activated slag; then, adding metakaolin and sand, and stirring; finally, adding a liquid alkali activator prepared from sodium hydroxide, silica fume and water, stirring, forming, aging and curing to prepare the stone coal vanadium extraction tailing geopolymers. The method disclosed by the invention is simple in process, low in cost, relatively small in energy consumption, high in tailing utilization ratio and environment-friendly; the prepared geopolymers are relatively high in compression strength, strong in dry shrinkage resistance, good in permeability resistance and high in durability, and have a good curing effect on heavy metal ions.

The invention provides application of temperature-sensitive hydrogel in improvement of the anti-dry-shrinkage cracking property of concrete. The concrete is prepared from the temperature-sensitive hydrogel, cement, aggregates and water. A preparation method of the concrete comprises the steps that firstly, the temperature-sensitive hydrogel is prepared; secondly, the aggregates and the water are blended to be uniform; lastly, the temperature-sensitive hydrogel and the water are added, the materials are blended to be uniform, and then the concrete can be prepared. The adopted homemade temperature-sensitive hydrogel is lightly-crosslinked macromolecules which can be polymerized to form a film after releasing water, no hole can be reserved in the cement concrete, and other properties of the cement concrete are not affected while the anti-cracking property of the concrete is improved. The initial volume water content of the concrete is increased along with increasing of the mixing amount of the temperature-sensitive hydrogel, and it is shown that the water storage capacity of the concrete is enhanced by mixing the temperature-sensitive hydrogel; the water absorption rate of the concrete is decreased along with increasing of the mixing amount of the temperature-sensitive hydrogel, and it is shown that the connectivity of capillary pores in the concrete is reduced by mixing the temperature-sensitive hydrogel.

This invention relates to a fiber reinforced artificial stone tomb box and making method, which contains fiber reinforced artificial stone made box unit with cavity and box cover with lower convex edge engaged with upper edge of box unit. The method contains mixing and agitating raw material into slurry, laying fiber net fabric in mold, putting slurry in mold, by molding, maintenance, stripping, repairing, finishing, spraying surface treating liquid to get products, raw material ratio is 30-60 part of cement, 40-65 part of fine aggregate, 1-4 part fiber filament, 1-8 part of anti-cracking permeability-reducing admixture, 0.2-1 part of superplasticizer, 1-5 part of silicate intensifier, 0-4 part of surface treating liquid, 0-0.5 part antifoaming agent and 0-0.5 part of paint. Said invention has advantages of fine anti-impact ability and impermeability, high strength, fine outline and low cost.

The invention relates to a red mud curing agent for paving a road and a preparation method of the red mud curing agent. The red mud curing agent is made of silicon oxide, aluminum oxide, calcium oxide, industrial byproduct alkali residue, tetrahydrophthalic anhydride and ethylene glycol double trimellitic anhydride ester. According to the preparation method, the active matters, such as silicon oxide, aluminum oxide and calcium oxide, are mixed; the active constituents of the matters are matched with one another, thereby obtaining curing agent and red mud; after being stirred, the curing agent and the red mud are subjected to ion exchange under the catalysis of concentrated material, thereby boosting the coagulation of red mud particles; and meanwhile, the red mud is coagulated and hardened, under the hydration reaction of a gelled material in the curing agent; the red mud has higher working strength within a short period of time; and the exosmose of heavy metal, radioactive elements and the like, is avoided. The red mud curing agent prepared by the preparation method disclosed by the invention is used together with red mud for paving the road. Compared with the prior art, the red mud curing agent has the advantages of high strength, excellent plate property, high durability, excellent water stability, excellent frost and melt resistance, excellent air shrinkage resistance, and the like.