186results about How to "Increased hydration rate" patented technology

The invention discloses a concrete early-strength agent, which is characterized in comprising the following components according to weight percentage: inorganic salt early-strength component 35-55 percent, organic early-strength component 5-10 percent, water reducing component 15-25 percent, wherein the inorganic salt early-strength component is prepared by at least two among sulfate, carbonate, nitrate, and nitrite; the organic early-strength component selects any one among calcium formate, sodium acetate, calcium oxalate, triethanolamine, tri-iso-propanolamine and carbamide; the water reducing component selects one among naphthalenesulfuric acid type, melamine type and polycarboxylate type. The invention makes the concrete be coagulated and hardened rapidly under the condition of low temperature, so that the early strength of the concrete is greatly improved as well as later strength is ensured.

In the presence of certain polyols, a guar gum or similar polysaccharide thickener solution is boron crosslinked before achievement of complete hydration of the thickener, without compromising the viscosity level achieved in a fracturing fluid by the time it is pumped into the wellbore and fractures the subterranean formation adjacent the wellbore. Methods continuously involve hydrating a polysaccharide thickener to an extent of 10% to 75%, but less than full hydration. Before 75% hydration is exceeded, a boron crosslinker is added. Upon addition of the boron crosslinker, the fluid is injected into the wellbore to stimulate hydrocarbon production. Because less time is needed for hydration, well site mixing equipment is down-sized smaller to achieve better efficiency and cost savings.

A gel mixing system that employs a dynamic diffuser for quickly removing the air from the fluid as the fluid exits a traditional gel mixer and employs progressive dilution of the gel in a series of hydration tanks to maximize hydration time without allowing the gel to become so viscous that it is not easily diluted or pumped. High shear agitation of the fluid between the hydration tanks helps to increase the hydration rate. Progressive dilution of the gel increases residence time of the gel in the tanks and results in longer hydration time in the limited tank space available, resulting in continuous production of gel that is almost fully hydrated when it is pumped to the fracturing blender and subsequently to the well bore without the need for an increase in the volume of the hydration tanks.

Liposomal pharmaceutical formulations incorporating porphyrin photosensitizers useful for photodynamic therapy or diagnosis of malignant cells. The liposomal formulations comprise a porphyrin photosensitizer, particularly the hydro-mono benzoporphyrine (BPD) having light absorption maxima in the range of 670-780 nanometers, a disaccharide or polysaccharide and one or more phospholipids.

The invention discloses a composite cement grinding aid and its preparation method. According to a formula, the composite cement grinding aid comprises: a grinding agent, a reinforcing agent, a surfactant, molasses, N, N-bis(2-hydroxyethyl)isopropanolamine and water. The composite cement grinding aid can enhance the fluidity of materials during grinding, effectively reduce overgrinding phenomenon of a mill, improve adhesion of the materials to a grinding body, a lining board, and a bin partition board as well as the self agglomeration phenomenon of the materials, thus increasing the machine-hour yield of the cement grinding mill by l0%-20%, enhancing the cement specific surface area to 20-40m<2>/Kg, reducing the sieve residue, optimizing cement particle gradation, promoting cement clinker hydration, and improving the cement mixture activity. The 3-day compressive strength is increased by 3-5MPa, and the 28-day compressive strength is increased by 4-8MPa. The clinker consumption is reduced by 6-10%. The cement production cost is effectively reduced, the cement security is improved, and the adaptability of cement and concrete admixtures are improved.

A cementing material is a cement whose main components are calcium phosphoaluminate, calcium aluminate and calcium phosphate. Its clinker contains such chemical components (wt%) as CaO (30-60), Al2O3 (17-50), SiO2 (1-15), P2O5 (10-30), Fe2O3 (1-8) and MgO (1-7). Its advantages are high and early strength, high refractory nature, and high compatibility with existing cement.

The invention relates to a method for improving the production yield of precipitated calcium carbonate (PCC). The improvement resides in the use of an enzymatic bioreactor that supplies HCO₃ into the reaction enabling to produce PCC without bubbling gaseous carbon dioxide in the aqueous solution. The present invention has an industrial applicability, namely in the pulp and paper industry.

The invention relates to a concrete compound type chloride-free early strength agent and a preparation method thereof and belongs to the technical field of early strength agents. The early strength agent comprises components in parts by weight as follows: 20-40 parts of calcium carboxylate, 10-15 parts of alkali carbonate, 5-10 parts of triethanolamine, 5-10 parts of formamide, 3-6 parts of naphthalene sulfonate, 5-10 parts of sodium sulfate, 3-5 parts of sodium silicate, 3-5 parts of trisodium phosphate, 3-6 parts of alkanolamide, 2-4 parts of cellulose ether and 4-7 parts of aluminum dihydrogen phosphate. According to the provided compound water reducer, cement hydration can be accelerated by means of added calcium carboxylate; aluminum dihydrogen phosphate is added and used for controlling a space structure of components, and the cement strength is improved; after the water reducer is applied to cement, the water reducer has better curing speed and strength.

The invention belongs to the field of construction materials, and particularly discloses a sleeve grouting material for connecting fiber reinforced steel bars. The sleeve grouting material is preparedfrom the following materials in parts by weight: 390-410 parts of cement, 90-110 parts of a doping material, 460-500 parts of sands, 1.4-1.6 parts of a defoaming agent, 6-8 parts of a composite waterreducer, 40-50 parts of a composite retarder, 35-40 parts of a composite swelling agent, 7-10 parts of a composite early strength agent, 6-8 parts of composite fibers and 135-145 parts of water. According to the sleeve grouting material for connecting fiber reinforced steel bars and the preparation method thereof, the performance indexes of the grouting material accord with specification requirements, the composite fiber can effectively achieve the effects of reinforcement, toughening and preventing crack extension in comparison with the sleeve grouting material for connecting steel bars without fiber reinforcement, and the rupture strength, tensile strength and structural stability of the grouting material can be remarkably improved.

Implantable, injectable, insertable, or otherwise administrable compositions that form hydrogels when implanted, injected, inserted, or administered into or onto living tissues comprise a pharmaceutically effective compound wherein the pharmaceutically effective compound is a codrug, or pharmaceutically acceptable salt or prodrug thereof in admixture with a hydrogel-forming compound. The pharmaceutically effective compound may be any compound that is soluble in bodily fluids, or that forms bodily fluid-soluble adducts when exposed to bodily fluids. Exemplary compounds include analgesic, anti-inflammatory and antibiotic compounds. The hydrogel-forming compound is a biologically tolerated substance that forms a hydrogel upon exposure to bodily fluids, such as the interstitial fluid surrounding or within a joint.

The invention provides a novel red mud-based grouting material and preparation method thereof. The grouting material is prepared from the following components by weight percent: 70-80% of red mud liquid, 15-25% of blast furnace slag powder, 5-10% of compound alkali-activator, 2-10% of water reducing agent and 1-2% of early strength agent. The novel red mud-based grouting material prepared from redmud and the blast furnace slag powder is good in fluidity, high in early strength and short in time of coagulation, and does not shrink. The preparation method provided by the invention reasonably utilizes industrial waste, can reduce the influence of the waste on the environment, and is easy in preparation; the method is simple in steps, convenient to operate and high in practicability.

A gel mixing system that employs a dynamic diffuser for quickly removing the air from the fluid as the fluid exits a traditional gel mixer and employs progressive dilution of the gel in a series of hydration tanks to maximize hydration time without allowing the gel to become so viscous that it is not easily diluted or pumped. High shear agitation of the fluid between the hydration tanks helps to increase the hydration rate. Progressive dilution of the gel increases residence time of the gel in the tanks and results in longer hydration time in the limited tank space available, resulting in continuous production of gel that is almost fully hydrated when it is pumped to the fracturing blender and subsequently to the well bore without the need for an increase in the volume of the hydration tanks.

The invention belongs to the technical field of concrete, and provides a high-slump-loss-resistant synergist, which is prepared from 40 to 60 parts of slump maintainers, 6 to 30 parts of thickening agents, 8.5 to 25 parts of polyhydroxyl retarders, 12 to 50 parts of excitants, 9 to 38 parts of sodium acetate or sodium silicate and 10 to 100 parts of hydramine or simethicone, wherein the slump maintainers are prepared from 300 to 450 parts of polyether, 20 to 45 parts of unsaturated acid, 30 to 80 parts of acrylic ester, 1.1 to 3.8 parts of chain transferring agents and 0.5 to 1.5 parts of reducing agents. A preparation method comprises the following steps of adding polyether into water; performing heating dissolution; then, dripping a material A and a material B; performing reaction for one hour to obtain the slump maintainers; adding water into thickening agents for dissolution; sequentially adding the polyhydroxyl retarders, the excitants, sodium acetate or sodium silicate; after thedissolution, adding hydramine or simethicone; adding the slump maintainers; performing uniform mixing to obtain the high-slump-loss-resistant synergist applied to concrete preparation. By using the technical scheme, the high-slump-loss-resistant synergist solves the problem of fast concrete slump loss in the prior art; meanwhile, the intensity is improved.

The invention provides a thixotropic agent for a polycarboxylate superplasticizer. The thixotropic agent is mainly prepared from components of raw materials in parts by mass as follows: 0.2-1 part of white carbon black, 3-12 parts of alkali carbonate and 1.5-6 parts of sulfate, wherein the thixotropic agent for the polycarboxylate superplasticizer and a polycarboxylate superplasticizer mother solution are sufficiently and uniformly mixed in water, and the thixotropic type polycarboxylate superplasticizer with excellent thixotropic performance in the precast concrete application process can be obtained. The thixotropic type polycarboxylate superplasticizer containing the thixotropic agent is doped in precast concrete, the thixotropy of the newly blended concrete can be remarkably improved, early strength development is promoted, and the problem that existing polycarboxylate superplasticizers don't have sufficient thixotropic performance in the precast concrete application process is effectively solved.

The invention discloses an industrial solid waste autoclaved aerated concrete block and a preparation method thereof. The concrete block uses fly ash, carbide slag, red mud, lime, desulfurized gypsumand cement as main raw materials and aluminum powder, sodium hydroxide, water glass and the dispersing agent silica fume as additives; the coal ash reacts with components in the carbide slag to generate ettringite, so the strength of the concrete block can be enhanced; a large amount of aluminum oxide contained in the red mud can a replace part of lime and undergo a hydration reaction with the cement, and the aluminum oxide in the red mud can react with calcium hydroxide in the carbide slag, so the strength of the block is enhanced; the coal ash, the carbide slag and the red mud react with oneanother to generate hydrated calcium silicate and hydrated calcium aluminate, so the structural compactness of the block can be improved; and the additives can enhance the foaming stability of the aluminum powder and improve the early strength of the block under an alkaline condition. The method is green and environment-friendly, and the waste of non-renewable resources is effectively reduced.

The invention relates to a technique using the waste residue of smelted chromium-iron alloy for brick making, the steps thereof are as follows: the mass mixture ratio of various raw materials is: 3.5 to 3 portions of cement, 17 to 24 portions of slag, 65 to 70 portions of fillers, 0.05 to 0.1 portion of an activator and the ratio of water to water/powder is equal to 0.3, wherein, the powder quantity is gauged by the mixing quantity of the cement and the powder residue; the slag and the filler are firstly added into a stirrer to be stirred for 60 seconds and 1/2 of the water amount is added and stirred for 60 seconds, and then the cement and the activator are added to be stirred for 3 minutes. In the stirring process, water is added and water usage is well controlled to form the shape of slime. The mixture taking the shape of slime is fed into the charging hopper of a vibrating brick making machine and the feeding vibration is carried out for 8S to 10S and the compression vibration is carried out for 10S to 12S, and then the mixture is molded and taken out to be piled up; after 24 hours, the mixture is maintained by watering. The invention has the advantages that: 1. precious territorial resources can be saved; 2. the usage of the cement can be saved so as to have the advantage in the building materials market with low cost; 3. the slag is comprehensively utilized, thereby changing waste into valuable and also having good environmental benefits.