34results about How to "Adjust clotting time" patented technology

The invention discloses a polycarboxylic retarding high-performance water reducing agent used for preparing concrete of middle and low strength grade. According to the weight percentage of the effective solid content, the water reducing agent comprises 9-15% of low air-entrained mother liquor, 0.5-3.0% of retarder, 0.01-0.03% of foam stabilizer, 0.03-0.10% of air-entraining agent, 0.02-0.08% of thickener, 0.05-0.20% of activator and the balance of water. The preparation method comprises the following steps of: weighing all compositions by the weight percentage of each effective solid content, putting and slowly mixing the compositions in a reaction kettle for 10-30min, thus obtaining the concrete. By adjusting the proportion of all compositions, the polycarboxylic retarding high-performance water reducing agent can meet the usage requirements of the concrete of middle and low strength grade (C15-C40), has the advantages of wide doping range, high water reducing ratio, good retarding effect, low chlorine and alkali content, low concrete shrinkage ratio, greenness, environmental protection and the like, and can prepare the green and economic high-performance concrete.

This invention relates to the field of concrete complex super-retarding water reducers. The super-retarding water reducer in this invention has a mass-fraction composition as follows: 0.5~25% ethylene polyamine alkyl phosphonic acid or its salt, 0.5~20% phosphonobutane tricarboxylic acid, 20~50% water reducers, 0~ 0.5% sodium dodecyl sulphates and water as the rest. There are two preparation methods in this invention, one is that, components mentioned above are directly mixed with water reducers at those mass fractions so as to form super-retarding water reducers; the other is that, super-retarding components are added during water reducer preparation. The super-retarding water reducers in this invention are compatible with different kinds of water reducers. They perform extraordinary retarding activities without any side effect.

This invention relates to the field of concrete super-retarding reagents that are compatible with all kinds of concrete water reducers. The super-retarding reagent in this invention has a mass-fraction composition as follows: 6~35% ethylene polyamine alkyl phosphonic acid or its salt, 5~15% phosphonobutane tricarboxylic acid and 50~90% water. The super-retarding reagent is compatible with different kinds of water reducers and cement, and can greatly reduce the loss of concrete mixture slump. The super-retarding reagent performs extraordinary retarding activities, and concrete solidification time can be adjusted to 3~150 hours by modulating product composition and dosage according to actual engineering demand.

The invention relates to special conjugate polyether for a polyurethane decompression foaming process of a solar water heater. The special conjugate polyether is characterized by comprising the following materials in parts by weight: 65-85 parts of polyether polyalcohol A, 15-35 parts of polyether polyalcohol B, 2-3 parts of foam stabilizer, 0.8-1 part of composite catalyst, 0.5-0.8 part of deionized water and 5-10 parts of foaming agent, wherein the polyether polyalcohol A is one or more of YD-6250 polyether, KS-8326 polyether and DD-450L polyether; and the polyether polyalcohol B is one or more of 450M polyether, 4110 polyether and 330B polyether. The invention can regulate the arising and curing time of foam, i.e. prolong the arising time and delay the curing time so as to ensure that a small amount of foam has sufficient foaming chance under low pressure, thereby ensuring that the foam has the advantages of little filling density, uniform density distribution and low thermal coefficient.

The invention belongs to the field of concrete admixtures and relates to a concrete viscosity modifier and preparation thereof. The concrete viscosity modifier provided by the invention comprises a polymer containing double bonds and a double-bond photocatalyst, wherein the polymer containing double bonds is prepared from the following raw material components in parts by weight: 5-50 parts of bisphenol compounds, 5-100 parts of carboxyl-containing monomers, 5-100 parts of monomers containing sulfonic groups, 1-50 parts of unsaturated monomers, 0.1-10 parts of 1,3-diene monomer, 10-300 parts ofalkali, 100-5000 parts of a solvent and 0.1-20 parts of a catalyst, wherein the total addition amount of the carboxyl-containing monomers and the monomers containing sulfonic groups is not less than50 parts by weight. The prepared concrete viscosity modifier has the advantages of being soluble, easy to construct and excellent in cohesiveness; and when the concrete viscosity modifier is added into cement and other materials to prepare concrete, the obtained concrete has high strength and aging resistance.

The invention discloses a special sprayed concrete material for a tunnel high-ground-temperature dry-hot environment. The total amount of cementing materials of concrete is 400-420 kg per cubic meter;the cementing material comprises the components in percentage by weight: 83%-89% of ordinary Portland cement, 10%-15% of sulphoaluminate cement and 1%-2% of nano silicon dioxide. Steel fibers are doped according to the volume ratio of 0.4%-0.6%; a shrinkage reducing agent is doped according to 5% of the weight of the cementing material; a setting accelerator is doped according to 3-5% of the weight of the cementing material when the concrete is prepared; the ratio of glue to bone is 1:4.0-1:4.5; the water-binder ratio is not greater than 0.50. The special sprayed concrete provided by the invention has higher compressive strength and tensile strength than common shotcrete with the same strength grade under the synergistic effect of materials with a certain proportioning ratio. According todifferent dry and hot environment temperatures, the bonding strength is 2-4 times of that of common sprayed concrete, and the rebound rate is only 1/3-1/2 of that of the common sprayed concrete.

The invention discloses a preparation method of a self-repair anti-crack concrete waterproofing agent, and belongs to the technical field of concrete admixture preparation. Hydrogen-containing silicone oil reacts under an alkaline condition to obtain silicone resin, calcined egg shells react with water and then react with gluconic acid to obtain calcium gluconate, the compounding of calcium gluconate and calcium silicate can reduce the hydration reaction heat of concrete and reduce the internal temperature rise of concrete, so as to reduce cracks, calcium gluconate can react with unreacted concrete to form dense hydration crystals to plug off the cracks of concrete, and calcium gluconate can achieve the purpose of waterproofing together with castor oil or other oil substances. The obtained self-repair anti-crack concrete waterproofing agent with the preparation method of the invention has good shrinkage compensation function, and effectively improves the anti-crack property, waterproof property and water impermeability of concrete; the admixture amount of the waterproofing agent is less, the early strength of concrete is increased, setting time is adjusted, and the durability of concrete is improved. The self-repair anti-crack concrete waterproofing agent has broad application prospects.

The invention relates to the technical field of the concrete repair and in particular to a concrete crack repairing material based on a phosphorus magnesium material and a construction technology thereof. The concrete crack repairing material based on the phosphorus magnesium material is obtained by mixing monoammonium phosphate, magnesium oxide, borax or boric acid, an additive, an admixture andaggregate according to a specific proportion, and in a repairing process of a concrete crack, interface treatment does not need to be performed. The prepared concrete crack repairing material based onthe phosphorus magnesium material has the characteristics of short coagulation time, high compressive strength in early stage, high breaking strength, high bonding strength, low dry shrinkage rate, good durability, high abrasive resistance and the like, and is capable of solving problems in the prior art that cost is high, ageing is easy and service life is short, the material is harmful to a human body in a construction process, the construction technology is complicated, the bonding strength of a bonding surface of old and new materials is low, integrality of a repairing structure is weak,longer maintenance time is needed and the like.

The invention relates to the technical field of concrete pumping and discloses concrete meeting an ultrahigh pumping requirement and a pumping method of the concrete. The concrete contains the following raw materials with the components (kg/m<3>): 350 of cement, 756 of sand, 924 of stones, 60 of admixture, 16.5 of polycarboxylate superplasticizer, 150 of water, 120 of fine aggregates and 3.3 of BTC functional additive; and the pumping method comprises the steps: paving pipelines, namely connecting horizontal pump pipes to a conveying pump, arranging a stop valve on a position where the horizontal pump pipes are 8-12 m away from the conveying pump, fixing the horizontal pump pipes on a plurality of concrete piers by using embedded parts, and fixing vertical pump pipes on a wall body by using a plurality of clamping pipes; and fixing the junctions of the horizontal pump pipes and the vertical pump pipes by using concrete blocks. Due to the addition of a water retaining component in the high-performance polycarboxylate superplasticizer and the use of the BTC functional additive, the viscosity of high-strength concrete is successfully reduced, meanwhile, the problem that the strength of the concrete is affected after coal ash is added is successfully solved, and ultrahigh pumping of the high-strength concrete is realized.

The invention relates to the technical field of retarding water reducers, in particular to a high efficiency concrete retarding water reducer. The high efficiency concrete retarding water reducer is prepared from the following raw materials in parts by weight: 40 to 60 parts by weight of polycarboxylic acid mother liquor, 5 to 15 parts by weight of sodium gluconate, 3 to 8 parts by weight of maltodextrin polyacrylamide grafted copolymer, 1 to 5 parts by weight of asbestos wool, 2 to 6 parts by weight of polyaluminum chloride, 3 to 8 parts by weight of anhydrous sodium sulfate, 2 to 5 parts byweight of calcium chloride, 5 to 12 parts by weight of poly ethylene glycol monoethyl ether, 1 to 5 parts by weight of p-aminobenzene sulfonic acid, 3 to 10 parts by weight of chitin, 0.2 to 3 parts by weight of sodium polyaspartate, 10 to 20 parts by weight of ammonium citrate, 3 to 8 parts by weight of acetone and 40 to 60 parts by weight of water. The retarding water reducer disclosed by the invention has the advantages that the condensation time of the concrete can be adjusted, the slump loss of the concrete also can be slowed down and the adaptability of the product is improved.

The invention provides a wear-resistant polyurethane glossy black finishing paint and a preparation method thereof; the finishing paint is composed of a component A, a component B and a component C; the three components are prepared and packaged respectively; therefore, the storage time is long; and chemical change is difficultly caused. When the wear-resistant polyurethane glossy black finishing paint is used, the solidification time can be adjusted by adjusting the proportion of the three components; and therefore, the wear-resistant polyurethane glossy black finishing paint has higher practicability and production adaptive capacity.

The invention discloses a building plaster thickening time control agent and a preparation method thereof, relating to a building material. The building plaster thickening time control agent comprises the following two components: building plaster with the specific surface area of 5000-10000cm<2>/g, and a polycarboxylic acid water-reducing agent, wherein the weight of the polycarboxylic water-reducing agent is 0.4-1.3% of that of the building plaster with the specific surface area of 5000-10000cm<2>/g. Compared with the prior art, the protected building plaster thickening time control agent is capable of shortening the die sinking time in production of products, and improving the production efficiency.

The invention provides a conditioning agent for segregated concrete and a conditioning method thereof. The conditioning agent can effectively recover the working performance of a segregated concrete mixture, wherein the conditioning agent comprises kaolin, limestone powder and dihydrate gypsum, the kaolin adopts low-quality kaolin calcined tailings, the mass fraction of the kaolin is 85-95%, the limestone powder is ground finely, the mass fraction of the limestone powder is 0-10%, and the mass fraction of the dihydrate gypsum is 5%. The conditioning method comprises the steps of determining the volume amount of the segregated concrete, determining the dosage of a gel material, determining the mixing amount and dosage of the conditioning agent, adding the conditioning agent and stirring. The slump loss and the setting time of the segregated concrete mixture doped with the conditioning agent by the regulating method are basically the same as those of normal concrete, and the strength ofhardened concrete is even slightly improved. It is proved that the conditioning agent has no obvious influence on the setting time and slump loss of the concrete, and on the contrary, the strength ofthe concrete can be improved.

The invention relates to the technical field of retarding water reducing agents, in particular to an efficient concrete retarding water reducing agent preparation method which includes the steps: (1)adding sodium polyaspartate, p-aminophenylsulfonic acid and polyethylene glycol mono-ether into poly aluminum chloride, stirring mixture for 0.5-1.5h at the temperature of 105-125 DEG C, and performing sealing and standing for 1-2h at the temperature of 0-5 DEG C to obtain modified poly aluminum chloride; (2) uniformly mixing polycarboxylate mother liquor, sodium gluconate, maltodextrin polyacrylamide grafting copolymers, chitin and ammonium citrate in mixed solution of water and acetone, adjusting a pH (potential of hydrogen) value of a mixed system to reach 6.6-7.5, stirring mixture for 20-30min at the temperature of 80-100 DEG C, and adding asbestos wool, the modified poly aluminum chloride, anhydrous sodium sulfate and calcium chloride after cooling to obtain the retarding water reducing agent. The water reducing agent prepared by the method has the advantages that the water reducing agent is wide in adding range, low in concrete shrinkage ratio, green, environmentally friendly andthe like.

The invention relates to a quick-setting high-strength anti-crack pavement patching material and a preparation method and application thereof, belonging to the technical field of cement production. The pavement patching material comprises the following raw materials in percentage by mass: 50 to 60% of micro-expansion moderate-heat Portland cement and sulphoaluminate cement, and 40 to 50% of auxiliary materials, wherein a mass ratio of the micro-expansion moderate-heat Portland cement to the sulphoaluminate cement is 1: (1-3); and the auxiliary materials are composed of the following raw materials in percentage by mass: 0.4 to 0.6% of fibers, 2.5% of rubber powder, 0.2% of a water reducing agent, 0.03% of a defoaming agent, 31 to 34% of fine sand and 8 to 11% of fly ash, and the proportionsof the fibers, the rubber powder, the water reducing agent, the defoaming agent, the fine sand and the fly ash are the percentages of the components based on the mass of the whole repair material. The quick-setting high-strength anti-cracking pavement patching material is prepared from the micro-expansion moderate-heat Portland cement, the sulphoaluminate cement and the auxiliary materials, so pavement patching cost is reduced, quick patching is realized, and obvious economic and social benefits are produced.