128 results about "Chemical admixture" patented technology

This invention relates to a new class of chemical admixtures for hydraulic cement compositions such as pastes, mortars, grouts and concretes. The cement compositions are comprised of ordinary Portland cement, blended cements, or non-Portland cements made with Supplementary Cementitious Materials. The admixtures contain complexes of metals with derivatives of hydroxycarboxylic acids, and improve properties of cement compositions, including setting, hardness, compressive strength, shrinkage, and freeze-thaw resistance. The invention discloses a method for improving the properties of hydraulic cements by adding the disclosed chemical admixtures to cement compositions, and also discloses methods of preparing said admixtures.

The invention relates to a fiber reinforced high-strength mortar used for concrete structure repair, belonging to the technical field of building materials. The mortar is characterized in that the mortar is formed by mixing cement, activated and inert mineral admixtures, expanding agents, micro steel fibers, chemical admixtures, sand and the like based on a certain proportion. At the constructionfields or concrete batching plants, the mortar is added with right amount of water and the mixture is stirred evenly, transported to the construction sites and poured by hand spreading or pumping. Thefiber reinforced high-strength mortar has high strength, good volume stability and durability and large deformability, can be free of vibrating and self-leveling construction, and is convenient, fastand flexible in construction. The structure repair combination property of the fiber reinforced high-strength mortar is greatly superior to that of the current commonly used fine gravel concrete or steel wire mesh-polymer cement mortar system.

The invention relates to a lightweight high-strength cement based composite material. The grain composition of a multivariate cementing material and grain composition of aggregate are optimized, anddue to use of additives such as water reducing agent and thickener, the material can obtain high compressive strength of over 20MPa while obtaining the unit weight which is significantly lower than that of common concrete. The material has the technical advantages that the compressive strength of 28d standard curing is greater than or equal to 20MPa when the unit weight is smaller than or equal to 1650kg/m<3>; the requirements of the construction liquidity can be met by grain composition of the optimized gel material and the grain composition of the aggregate; the hardened material has a dense surface, and has excellent endurance performances such as anti-permeability, carbonation resistance, resistance to chloride ion erosion and the like.

The invention discloses a high fluidization micro expansive high-strength grouting material which comprises the following raw materials by mass percentage: 23-34% of cement, 3-5% of microbead, 5-7.5% of phosphorus slag composite powder, 2.5-3.5% of silica fume, 2.5-3.5% of quartz powder, 46-55% of fine aggregate, 0.7-1% of water reducer, 0.01-0.03% of defoaming agent, 2.5-3.5% of expanding agent and 0.5-1% of early strength agent. The grouting material has the advantages of high strength in the early stage and later stage, good flowing property and adjustable expansiveness by taking the cement as a major binding material and employing the silica fume, the microbead and the phosphorus slag composite powder with different hydration activities together with a chemical additive matched with a binding material system and an aggregate system with reasonable gradation, and is particularly applicable to high precision equipment mounting, secondary grouting of an equipment foundation, bolt anchoring, crack repairing, duct grouting and the like.

The invention discloses an ecological nanoparticle reinforced cement based composite material and a preparation method thereof. High-strength and high-elastic spherical nanoparticles in industrial waste residues are adopted for largely replacing cement, and a high-performance admixture with a water-reducing rate of over 50% and high-strength superfine coppered steel fibers are used, and through the effective and efficient application of cement, the ecological nanoparticles, the chemical admixtures, the steel fibers and multi-element composite techniques thereof, the composition and structure optimization of concrete materials is greatly promoted, and an effect that the advantages of the components are superposed, and components are complementary is achieved. According to the invention, the problem that under standard curing and steam curing conditions, the compressive strength of an existing cement-based composite material can not reach over 300 Mpa and the bending strength can not reach over 60 Mpa is solved, the highly efficient regeneration and utilization rate and core technological value of the industrial waste residues are greatly enhanced, and the application amount of cement clinkers in the cement-based composite material is reduced, and therefore, the composite material is suitable for being used as a large civil engineering structure material with a designed concrete compressive strength of 300 Mpa.

The present invention relates to a light weight and high strength cement base composite material. According to the present invention, particle size distribution of a multi-component cementing material and particle size distribution of an aggregate are optimized, and a reducing agent, a thickener and other chemical admixtures are used to make the material can concurrently achieve bulk density of significantly lower than bulk density of the ordinary concrete and a compressive strength of more than 20 MPa; the technical advantages of the material comprise that: in the case of the bulk density of less than or equal to 1650 kg/m<3>, the 28 d standard maintenance compressive strength of more than or equal to 20 MPa is achieved, and the construction fluidity requirements can be met in the case of the low water-binder ratio by optimizing the particle size distribution of the cementing material and the particle size distribution of the aggregate; and the hardened material has characteristics of compact surface, excellent impermeability, excellent carbonization resistance, chloride ion erosion resistance, and other durable performances.

The invention belongs to a mortar used for the heat insulation of external walls of buildings, which consists of fibers and a plurality of functional chemical admixtures added in the organic light heat insulation mortar. The functional chemical admixtures consists essentially of hydrophobic agent taking hydrophobic effect, such as SEAL80 of organic silicon, zinc stearate, etc. cellulose ether and guar gum taking water retention and viscosity-phobic effects, polyvinyl alcohol taking thickening and foam stabling effects, re-dispensable latex powder taking water resistant and flexibility increasing effects and a little amount of air-entraining agent for lowering the volume and the density and reducing the thermal conductivity. With the common functions of the admixtures, the construction performance, the water resistant performance and the bond strength of the heat insulation mortar are improved. The invention can be used for the heat insulation of the external walls.

The invention relates to high fly ash commercial concrete or ready-mixed concrete or a preparation method thereof. The high fly ash commercial concrete or ready-mixed concrete is made from gelled material, aggregate, chemical additive and water; wherein, the gelled material comprises cement and fly ash; the aggregate comprises fine aggregate and coarse aggregate; and the chemical additive is polycarboxylate-based high performance water reducer. The usage of the gelled material is 360-480kg/m<3>concrete; wherein, the concrete is 47%-69wt% of the total gelled material; and the fly ash is 31%-53wt% of the total gelled material. The concrete has good workability, suitable strength and strength development, lower hydration temperature rising, higher volume stabilization, higher cracking resistance, impermeability, frost resistance, corrosion stability, resistance to carbonizing, alkali-resistant-aggregate reaction and chloride-resistant diffusibility.

The invention discloses an environmentally-friendly odor removing dual-component cement-based waterproof material, which is prepared from the following ingredients in parts by weight: 1 part of liquidmaterial ingredient and 1-6 parts of powder material ingredient, wherein the powder material ingredient comprises cement, sand, inert filler, active filler and chemical additive; the liquid materialingredient comprises polymer emulsion, defoamer, bactericide and water. The environmentally-friendly odor removing dual-component cement-based waterproof material has the characteristics of extremelylow ammonia content, odor removal, good environment protection performance, good physical performance, good construction hand feeling and convenience in use and is suitable for various construction technologies including spraying, rolling and brushing, and VOC (volatile organic compounds), formaldehyde and harmful heavy metal powder can not be detected.

A method of producing cementitious mixtures containing fly ash as one of the cementitious components, under air entrainment conditions is described. The method involves forming a mixture comprising water, cement, fly ash, optionally other cementitious materials, aggregate, conventional chemical admixtures, and an air entrainment agent and agitating the mixture to entrain air therein. Additionally, at least one amine sacrificial agent is included in the mixture. The cementitious mixtures and hardened concretes resulting from the method and fly ash treated with sacrificial agent, or air entrainment agent/sacrificial agent combinations, are also described.

An activated composite waste dregs powder used for cement, concrete and non-calcine brick is prepared from acidified zeolite powder, lead or copper dregs, carbonate stone powder, phosphate dregs (ardealite), lime dregs and powdered coal ash as basic materials. Its advantages are high property and low cost.

The invention discloses alkali-activated cement. The alkali-activated cement comprises a basic component and a compound chemical additive, wherein the basic component is prepared from the following components by mass percent: 10-30% of abandoned clay brick powder and 70-90% of high-calcium fly ash, and amount of added compound chemical additive accounts for 10-15% of the mass of the basic component metered by content of introduced Na2O. The invention also discloses a preparation method of the alkali-activated cement. The preparation method of the alkali-activated cement comprises the following steps: mixing the abandoned clay brick powder with the mass percentage of 10-30% with the high-calcium fly ash with the mass percentage of 70-90%, adding the compound chemical additive accounting for 10-15% of the sum of the mass of the abandoned clay brick powder and high-calcium fly ash, controlling water-solid ratio of a system to be 0.28-0.32, and mixing, so that the alkali-activated cement is obtained. The alkali-activated cement disclosed by the invention has the beneficial effects that industrial waste, namely the high-calcium fly ash and the abandoned clay brick powder, are utilized, an approach is provided for utilization of the waste, and cost is reduced.

The present invention discloses a concrete with high strength and high performance for deeply and thickly frozen well wall. The double-doping technology of milled slag as the main mineral doping and different chemical doping is used; the invention is prepared after optimized combination and blending of mixture. The concrete is made by mixing P.0.42.5cement, machine-made sand, limestone rubble, milled rubble, I-level powder coal ash, TK-M intensifier, J851-D early strengthening high-early-strength water reducing agent, JQ-D anti-crack intensifying agent, high-efficiency water reducing agent of liquid polycarboxylic salt, and water. The present invention has the characteristics of the low preparation cost, the simple operation process, the applicability to engineering of the inside of a deeply and thickly frozen and a well wall on the outer layer, and so on.

The invention provides quick setting type rigid repair mortar prepared from industrial byproducts such as coal ash, mineral powder and tailing fine sand as well as a preparation method of quick setting type rigid repair mortar. The coal ash and mineral powder-based geopolymer quick setting type rigid repair mortar consists of a solid component material and a liquid component liquid; the solid component material is formed by combining the coal ash, the mineral powder, the tailing fine sand and a chemical additive according to a certain proportion; the liquid component material is formed by mixing a sodium hydroxide solution with a certain concentration, waster glass and water according to a certain proportion; and the solid component material and the liquid component material are stirred completely and uniformly according to a certain proportion, and the quick setting type rigid repair mortar can be used. The coal ash and mineral powder-based geopolymer quick setting type rigid repair mortar prepared by the method has excellent performance and completely meets each perform index requirement of JC/T 2381-2016. The main raw materials of the coal ash and mineral powder-based geopolymerquick setting type rigid repair mortar are industrial byproducts such as the coal ash, the mineral powder and the tailing fine powder and belong to environment-friendly materials.

The invention relates to a non-shrinkage cement-based roofing material, belonging to the technical field of building materials. The roofing material is formed by mixing cement, activated and inert mineral admixtures, plaster, expanding agents, glass fibers and organic synthesis fibers, chemical admixtures, sand and the like based on a certain proportion. At the construction field, right amount of water is added and stirred evenly, and is constructed by hand spreading or spraying. Regarding constructed roofing, the thickness of the waterproof layer is 35-50mm and the area of the separate bin is 50-300m. The non-shrinkage roofing material has high strength, good volume stability and excellent waterproof property, can be used for thin layer construction and is convenient, fast and flexible in construction. The roofing material is low in cost, convenient in production and changeable in production scale, and is applicable to the requirements of construction of villages and small towns. In addition, the roofing material utilizes a substantial proportion of industrial residues, thus not only reducing cost but also conducing to environment protection.

The invention relates to a composite soil solidifying agent, and a preparation method thereof. According to the invention, ore slag, nickel slag, cement, and chemical additives are mixed according to a certain ratio, such that the soil solidifying agent is obtained. When the solidifying agent with a proper amount is doped in weak soil, a substantial enhancing effect can be obtained. Especially, soil water resistance and corrosion resistance can be improved. The solidifying effect is substantially better than that of Portland cement. Industrial waste slag is adopted as main raw materials, such that cost is reduced, and environment protection is benefited.