33results about How to "Reduce early heat of hydration" patented technology

The invention discloses a method for preparing a large-admixture-amount wet-milled phosphorus solid waste super-retarding cementing material. The method comprises the following steps: putting phosphorus slag and desulfurized fly ash into a wet-milling machine, and performing mixing and wet milling so as to obtain mixed slurry A; grinding caustic dross, ardealite and coal ash in a dry-milling machine so as to obtain a mixed powder material B; and mixing the mixed slurry A with the mixed powder material B so as to obtain a mixed material C, adding cement, a water reduction agent, a retarder, tailing sand and macadam into the mixed material C, and performing stirring for 4 minutes, so as to obtain super-retarding concrete. Wastes such as the phosphorus slag, desulfurized fly ash, caustic dross, ardealite, coal ash and tailings are adopted to prepare concrete, wastes are turned into wealth, and the amount of cement can be also reduced; due to a mixed wet-milling mode of the phosphorus slagand the desulfurized fly ash, phosphorus dissolution of the phosphorus slag can be promoted, the initial setting time and the final setting time of the concrete can be greatly prolonged, early-stagehydration heat can be reduced, cracks can be reduced, later strength can be ensured, and large-admixture-amount efficient application of the phosphorus slag can be achieved; and the prepared super-retarding concrete can be applied to large-size concrete, drilling bitten piles, and the like.

The invention discloses a slow hardening pump deliver type three expansion source concrete expansion agent, which is characterized by comprising preparation of raw materials such as anhydrite, high alumina chamotte, high-calcium sulphoaluminate chamotte, calcined magnesite and so on by weight portion and externally doped slushing agent, water retention agent, air entraining agent and retardant. The preparation method of the expansion agent comprises steps of crushing, common mixture, mixing and grinding and external doping mixture and finish product forming. The product has low alkali content, excellent expansion performance, strong suitability with concrete, balanced mechanical property after hardening, and small gradual slump loss of concrete shrinkage compensation, contributes to improving safety and durability of reinforced concrete, obviously improves the cracking resistance, volume stability, impermeability and frost resistance, and is simple and convenient to use and easy to control quality in construction. The slow hardening pump deliver type three expansion source concrete expansion agent can meet construction use requirements of commercial concrete, long distance pump-delivering concrete and mass concrete.

The present invention discloses a cement concrete for the wet connection seam of a system sequentially comprising simply-supported bridge and continuous bridge, and a preparation method thereof, wherein the cement concrete comprises cement, river sand, water, a polycarboxylic acid-based efficient water reducer, rice hull ash, apatite, sericite, sepiolite, a sodium polyacrylate high water absorption resin, talc powder, nanometer calcium carbonate, polyethylene fibers and polyester fibers, and with the synergistic effect among the mineral components such as the apatite, the sericite and the sepiolite and the two fibers, the toughening can be achieved, the impact resistance and the extension ability of the concrete can be improved, and the problems that the wet connection seam concrete is damaged and the bridge surface cracks can be effectively solved. According to the present invention, the cement concrete has advantages of high compressive strength, good toughness, impact resistance, permeation resistance, self-leveling, and the like.

The light energy-saving heat insulating wall material is produced with light aggregate in 1.2-2.6 wt%, gelating material in 72-76 wt% and sand in 22-26 wt%, as well as water in 35-88 wt% of gelating material, bulking agent in 13 wt% of gelating material and water reducing agent in 1 wt% of gelating material. The light energy-saving heat insulating wall material has the advantages of saving in land, low power consumption, light weight, easy construction, high heat insulating performance, etc. and may be used in network structure building system and non-bearing wall building system.

The invention discloses a method for firing ceramsite from coal mixed slag and sludge. The method comprises the following steps: grinding coal slag and clay, drying for later use, and dewatering sludge; uniformly mixing and stirring the coal slag, the clay and the dewatered sludge according to a certain ratio; weighing the various materials according to the volume, wherein the amount of the coal slag is 20-60%, the amount of the clay is 20-30%, and the amount of the dewatered sludge is 20-50%; preparing spheres with the particle sizes of 0-40mm from the uniformly stirred and mixed materials in the step b; drying the prepared spheres in a thermostat at the temperature of 105+/-5 DEG C; preheating the spheres dried in the thermostat in a preheating tank at the temperature of 350-500 DEG C for 10-30 minutes; and finally, roasting the spheres in the preheating tank in a roasting box at the temperature of 1050-1150 DEG C for 5-15 minutes, and cooling, thereby obtaining the lightweight ceramsite. The ceramsite fired by the method disclosed by the invention is controllable in operation and high in reproduction ratio; and moreover, more than 70% of solid wastes serve as raw materials, so that the resources are saved, and the cost is reduced.

The invention provides a WHDF-S type inorganic mortar anti-cracking waterproof agent. The WHDF-S type inorganic mortar anti-cracking waterproof agent comprises, by weight, 18-28% of crystallization stimulated components, 12-18% of active stimulated components, 7-15% of tricalcium aluminate suppression components, 3-6% of retarder components, 6-13% of viscidity promoting components, 2-6% of anti-microorganism components, and 30-40% of water. The WHDF-S type inorganic mortar anti-cracking waterproof agent has excellent anti-cracking and waterproof performance, belongs to inorganic materials, is environmentally friendly, not prone to aging and low in cost, and the construction technique is simplified. The innovativeness of the WHDF-S type inorganic mortar anti-cracking waterproof agent lies in the technical path that three agents are combined into one, the inorganic materials are used boldly to solve the problems of cement hydration degree and the amount of gel products, the interior is more compact, and the problems that materials are aged and decorative surfaces are repaired frequently are solved. The WHDF-S type inorganic mortar anti-cracking waterproof agent has the advantages that construction is convenient, and the economic cost and comprehensive cost are reduced.

The invention discloses an anti-corrosion anti-cracking permeability reducing agent for marine concrete and a preparation method of the anti-corrosion anti-cracking permeability reducing agent, and belongs to the technical field of concrete admixtures. The anti-seepage agent is prepared from the following raw materials in parts by weight: 5 to 10 parts of a water reducing agent, 4 to 10 parts of a micro-nano anti-seepage component, 1.5 to 3.5 parts of an air entraining agent, 3 to 9 parts of anti-crack fiber, 1 to 3 parts of inositol hexaphosphate, 1 to 5 parts of polypropylene glycol, 0.5 to 1 part of hydroxy propyl distarch phosphate, 0.5 to 1.5 parts of chitosan and 20 to 30 parts of water. According to the anti-seepage agent disclosed by the invention, nano silicon dioxide is modified in two steps and then is mixed with the anti-cracking fiber, two isolated strength enhancing substances are organically combined and jointly act with other raw materials, the anti-seepage and anti-cracking properties of a concrete material are remarkably improved, and the obtained admixture does not contain substances harmful to a human body, is chlorine-free, green and environment-friendly, and has a good application prospect. The durability of the concrete in the marine environment can be greatly improved, the service life is prolonged, and the safety is improved.

The invention provides a WHDF-N type viscosity modifier applicable to self-compacting concrete. The WHDF-N type viscosity modifier comprises components in percentage by weight as follows: 15%-25% of a crystallization excitation component, 7%-13% of an activity excitation component, 10%-15% of a tricalcium aluminate inhibition component, 6%-14% of a workability regulation component, 2%-6% of an anti-microbe component and 30%-40% of water. Under actions of promoting cement hydration degree, optimizing a hydration product, inhibiting early rapid hydration of tricalcium aluminate, reducing early hydration heat and the like, the WHDF-N type viscosity modifier has the advantages that gel of a system is increased, pores are reduced, an aggregate interface structure and early hydration heat are improved, and the workability and self-compacting performance of a concrete mixture are improved effectively while the crack resistance, impermeability and durability of the concrete are improved remarkably.

The invention discloses a concrete anti-seepage and anti-freezing admixture suitable for a plateau complex environment and a preparation method thereof. The concrete anti-seepage and anti-freezing admixture comprises the following raw materials in percentage by mass: 10-15% of sodium dodecyl benzene sulfonate, 7-10% of calcium nitrite, 3-6% of calcium formate, 5-8% of methanol, 4-7% of ethylene glycol, 2-5% of sodium gluconate, 1-3% of sodium polyacrylate, 11-14% of polyoxyethylene ether and the balance of deionized water. According to the anti-seepage and anti-freezing admixture disclosed by the invention, the construction of concrete under low-temperature and negative-temperature conditions can be realized, the construction period of the concrete can be prolonged, the early strength of the concrete can be improved, and the durability of the concrete and the service capacity of the concrete under complex plateau environment conditions can be effectively improved.

The invention relates to a proportioning method for novel C25 concrete applied to downhole floor pouring. The method is characterized in that the concrete is cement, gravity-separated iron tailings, yellow sand, cobblestone, water, a high-efficiency water reducer and steel fibers in a mass ratio of (394-400): (410-418): (380-385): (791-800): (220-225): (4-5): (55-60). The method can effectively reduce the usage amount of yellow sand in a reasonable range, so the cost of support production is lowered; and at the same time, the high-performance water reducer and large-proportion steel fibers areintroduced to improve the deformation resistance, compressive strength, abrasion resistance, toughness, impact strength and durability of the concrete.

The invention discloses high-performance sulfur concrete and a preparation method thereof. The high-performance sulfur concrete comprises the following raw materials in percentage by mass: 30%-37% ofcement, 38%-43% of river sand, 11%-17% of water, 0.4%-0.8% of a water reducer, 8%-15% of sulfur powder, 0.1-0.5% of an emulsifying dispersant and 0.8-1.2% of resin emulsion. By the high-performance sulfur concrete provided by the invention, sulfur can be recycled, furthermore, the bending resistance, the seepage resistance and the frost resistance of the concrete can be improved, and the durability of the concrete and the service capability of the concrete under extreme condition are improved effectively.

The invention discloses a cement stabilized macadam mixture and a road base layer construction method used in high-temperature seasons. The mixture comprises cement, a saccharose solution, stabilizedmacadam rough aggregates and fine aggregates. Saccharose is fused in cement stabilized macadam mixed water, the cement hydration reaction can be delayed, the non-delayed-coagulation cement delayed coagulation effect is achieved, and the cement stabilized macadam mixture has sufficient construction delay time. The construction delay time can be flexibly adjusted according to the mixing amount, thesufficient construction time can be achieved for the cement stabilized macadam mixture under the situation that ordinary cement is used in the scorching summer, and accordingly the engineering qualityis ensured.

The invention discloses a coral aggregate aggregate base layer or cushion layer material and a preparation method thereof. The raw materials comprise cement, aggregates and seawater, and the cement isslag aluminate cement or maritime work cement; and the aggregates comprise coral aggregate aggregates and one or more of steel slag fine sand, waste concrete and waste incineration slag. Local materials are used, the cost is low, the seawater corrosion resistance is high, the flexural-tensile strength is high, the anti-cracking performance is high, the anti-permeability performance is high, the early hydration heat is low, the construction period is short, and the material is suitable for serving as a pavement base layer or cushion layer material. A vibration stirring mode is adopted for mixing, the mixture is uniform, and the material can be applied to pavement base layer or cushion layer engineering construction of airfield runways on islands and reefs, highways, ports, wharfs and the like.