9results about How to "Reduce drying shrinkage" patented technology

The invention discloses low-shrinkage all-solid waste concrete and a preparation method thereof. The low-shrinkage all-solid waste concrete is prepared from the following raw materials in parts by mass: 14 to 20 parts of solid waste-based cementing material, 25 to 40 parts of high-titanium heavy slag sand, 35 to 50 parts of high-titanium heavy slag gravel, 5.5 to 7.5 parts of water and 0.2 to 0.5 part of water reducing agent, the solid waste-based cementing material comprises the following components in parts by mass: 40-70 parts of water-quenched slag powder, 10-30 parts of carbide slag, 10-20 parts of gypsum, 5-20 parts of fly ash and 0-5 parts of silica fume. By utilizing the internal curing effect of the titanium slag aggregate, continuous water can be provided for concrete hydration, the later-stage dry shrinkage of the concrete is reduced, and the strength of the concrete is improved; the high alkalinity of the carbide slag and the high sulfate content of the gypsum are utilized, and the alkali-sulfate synergistic excitation effect is utilized, so that the activity of the water-quenched slag powder and the like can be fully excited under the condition that cement and a chemical exciting agent are not used, and the strength performance of the concrete is ensured; meanwhile, steel slag is not used as a component material, so that the problem of poor concrete volume stability caused by the steel slag can be avoided.

The invention relates to the field of curing agents, and particularly discloses a desert sand curing agent as well as a preparation method and a use method thereof. Wherein the desert sand curing agent comprises the following components in parts by weight: 10-30 parts of slag, 10-30 parts of fly ash, 5-20 parts of cement, 0.1-0.3 part of polymer fiber and 30-50 parts of modified slag; wherein the modified slag is obtained by grafting lignin on the surface of coal-fired slag. By implementing the curing agent, the mechanical property and durability of a curing material obtained by curing the curing agent can be improved, and the dry shrinkage is reduced.

The present application relates to the technical field of aerated concrete preparation, and particularly relates to a method for preparing electrically conductive aerated concrete by using porous carbonized recycled aggregate and the aerated concrete. The process method first places pre-wetted recycled aggregate in a pressurized carbonization kettle, and industrial waste gas with CO2 concentration greater than or equal to 20% is introduced to react for 2-3 hours at 0.5-0.7 MPa and 60-70 DEG C to produce porous carbonized recycled aggregate. Then the porous carbonized recycled aggregate is dry-mixed with gel material, gypsum, conductive carbon black and reinforcing fibers, and then mixing water containing water reducing agent (water aggregate ratio 55-60%) is added to stir into base mortar. Then aluminum paste suspension is added to the mortar, and after stirring to start aeration, the mortar is poured into a mold. After 2-3 hours of static aeration, the mold is finally autoclaved and dried for 6-8 hours to obtain the electrically conductive aerated concrete. Through aggregate pretreatment strengthening, orderly dispersion of the conductive phase and hierarchical curing control, the present application can effectively solve the contradiction between light weight, high strength, electrical conductivity and durability, and provide a multifunctional green building material solution for airport construction.

The invention provides a cement-based composite material mixed with surface modified steel fiber and a preparation method thereof. The cement-based composite material is prepared from the following raw materials: 300 to 750 parts of cement, 60 to 100 parts of fly ash, 80 to 200 parts of silica fume, 40 to 100 parts of mineral powder, 300 to 600 parts of coarse aggregate, 400 to 800 parts of fine aggregate, 10 to 60 parts of zinc oxide whisker, 50 to 200 parts of modified steel fiber, 150 to 200 parts of tap water and 8 to 25 parts of water reducing agent. CaCO3 particles are introduced into the modified steel fibers through surface mineralization treatment, on one hand, a large number of fixed sites are provided, and on the other hand, the fibers are endowed with surface roughness, hydrophilicity and affinity with cement mortar, so that the interfacial compatibility and binding force between the steel fibers and a cement matrix are improved, and the gravity effect of the steel fibers is overcome; and meanwhile, the low-density zinc oxide whiskers replace part of steel fibers, so that the gravity effect is also reduced. In addition, the dense filling effect of the zinc oxide whiskers further improves the internal microstructure of the concrete, reduces the generation of gaps, and improves the compactness of the concrete. According to the invention, the reinforced and toughened cement-based composite material with uniformly dispersed fibers is obtained.

The invention discloses lightweight thermal insulation concrete as well as a preparation method and application thereof, and belongs to the technical field of lightweight thermal insulation materials. The concrete comprises cement, fly ash, expanded perlite, polystyrene foam particles, a water reducing agent, a functional foaming liquid, a foam stabilizer, cellulose ether and water. Wherein the functional foaming liquid is formed by compounding sodium dodecyl benzene sulfonate, terephthalic acid, sodium carboxymethyl cellulose and tannic acid, and the foam stabilizer is composed of dodecanol and decyl glucoside according to the mass ratio of 1: 1. According to the invention, a nanotube network is formed in situ on a bubble interface through the functional foaming liquid, and the synergistic foam stabilizing effect of the composite foam stabilizer is combined, so that the foam stability is remarkably improved, and the pore structure of a hardened body is optimized. The obtained concrete has the advantages of low density, low heat conductivity coefficient, high compressive strength, excellent freeze-thaw resistance, chloride ion permeation resistance, carbonization resistance and durability, and is suitable for building non-bearing wall self-insulation systems, roof insulation layers and fireproof isolation belts.

The invention provides a direct preparation method of a fly ash-slag geopolymer composite material compositely modified by sol type nano SiO2 and a water reducing agent. Firstly, sol-type nano SiO2 is prepared in situ through a sol-gel method, the sol-type nano SiO2 and a water reducing agent are jointly added into coal ash-slag geopolymer slurry and mixed uniformly, the sol-type nano SiO2 provides a high-activity reactant, and the water reducing agent optimizes the working performance of the geopolymer, so that the reaction rate of the geopolymer is increased, the pore structure is more compact, and the porosity of the geopolymer is improved. And finally, relatively good mechanical properties and durability are obtained. Under the action of the two admixtures of the sol-type nano SiO2 and the water reducing agent, the coal ash-slag geopolymer can obtain better mechanical property and durability under the condition of lower dosage of the alkali activator, and has better flowability at the same time.

The invention discloses fiber polymer titanium gypsum mortar and a preparation method thereof. The fiber polymer titanium gypsum mortar is prepared from the following raw materials in parts by weight: 40 to 60 parts of titanium gypsum, 40 to 60 parts of sand, 10 to 15 parts of alkaline additive, 0.5 to 1 part of sodium sulfate, 2 to 3 parts of quick lime, 0.1 to 3 parts of plant fiber, 1 to 2 parts of cellulose ether, 0.2 to 2 parts of water reducing agent, 1 to 5 parts of redispersible latex powder and 0.1 to 2 parts of retarder. The doped plant fiber raw material is wide in source, so that the impermeability and the crack resistance of the gypsum mortar are effectively improved, and meanwhile, the construction performance is improved. The titanium gypsum is only dried and does not need to be calcined, certain additives and plant fibers are added, the high-water-resistance gypsum mortar with the titanium gypsum as a main cementing material is obtained, an energy-saving and environment-friendly product with good mechanical properties is provided, and meanwhile the high-water-resistance gypsum mortar has the advantages of being low in production cost, wide in raw material source and good in water resistance.

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.

The application provides a preparation method of a solidifying agent based on a full-solid waste saline soil, which comprises the following steps: respectively measuring the content of SO4 2‑ and Cl ‑ in saline soil and mixture A, respectively calculating the mixing amount of mixture A and mixture B in the saline soil, obtaining the mass of required alkali residue and carbide slag according to the mixing ratio of mixture A and mixture B in the saline soil, respectively adding mixture A, mixture B and water into a stirring machine to obtain a solidifying agent of solidified saline soil by stirring, and respectively adding the solidifying agent and the saline soil into a stirring machine container to obtain solidified saline soil. The solidifying agent formed by the synergistic excitation system of salt-alkali is used to excite slag and steel slag, so that the saline soil is reinforced, and the saline soil has higher strength when the mixing amount of the solidifying agent accounts for 25% to 35% of the mass of the saline soil.