11results about How to "Reduced hydration" patented technology

The invention belongs to the technical field of concrete, and particularly relates to a concrete hydration temperature rise inhibitor and a preparation method and application thereof. The concrete hydration temperature rise inhibitor is of a core-shell structure composed of an inner core and a shell layer. Wherein the core comprises a porous material and a hydration temperature rise inhibition material loaded on the porous material, and the hydration temperature rise inhibition material comprises 2-phosphonobutane-1, 2, 4-tricarboxylic acid, modified starch, 1-hydroxyethylidene-1, 1-diphosphonic acid, sodium polyacrylate and cellulose ether. The concrete hydration temperature rise inhibitor has an efficient hydration heat inhibition effect, the proportion of a hydration temperature rise inhibition material in the inhibitor is large, meanwhile, an exothermic temperature peak can be accurately inhibited, and no negative influence is caused to a hydration induction period.

The invention discloses composite delayed coagulation type magnesium phosphate cement and a preparation method thereof, and relates to the technical field of building materials, the composite delayed coagulation type magnesium phosphate cement comprises a dead burned magnesium oxide and mineral admixture mixture, phosphate, a composite retarder and glue-containing water, in the dead burned magnesium oxide and the mineral admixture, the mass ratio of dead burned magnesium oxide to the mineral admixture is 3: 2, and the mass ratio of phosphate to the composite retarder to the glue-containing water is 1: 1. The mass ratio of the dead burned magnesium oxide and mineral admixture mixture to the phosphate is 3: 1, the mass of the composite retarder is 7-24% of the mass of the dead burned magnesium oxide and mineral admixture mixture, and the water-binder ratio in the glue is 0.18-0.20. The preparation method comprises the steps of high-temperature pretreatment of the mineral admixture, metering and dry mixing of all the components and cement mixing. The attapulgite and the kaolin which are treated at high temperature are mixed with dead burned magnesium oxide, so that the heat release rate at the initial stage of a hydration reaction is reduced, the cement setting time is prolonged, meanwhile, micro holes and cracks in a cement matrix can be filled, the compactness of a magnesium phosphate matrix is improved, and finally the strengths at different ages are improved.

The invention discloses self-compacting concrete and a preparation method thereof, and relates to the technical field of concrete, and the concrete comprises cement, fly ash, mineral powder, water, sand, stone and a modified water reducer. The modified water reducing agent is a polymer prepared from a hydroxyl-containing monomer I, a double-bond-containing acyl chloride monomer II, an unsaturated polyether monomer III and a double-bond-containing monomer IV in a mass ratio of (0.5-1.5): 1: (9-12): 1 through esterification reaction and double-bond addition polymerization, and hydroxyl, carboxyl and a polyether side chain are introduced into a molecular chain of the polymer at the same time. According to the water reducer, through the synergistic effect of hydrogen bond stable adsorption, steric hindrance and electrostatic repulsion, the compressive strength of concrete is improved, the slump is reduced, the balance of super-long retarding and high-strength development is achieved, and the comprehensive performance is excellent.

The invention relates to the technical field of hole filling materials around a shield, and discloses a hole filling material around the shield and a preparation method and application of the hole filling material around the shield. The mass ratio of the sodium bentonite to the calcined kaolin to the organosilicon waterproofing agent to the fly ash to the building retarder to the thickening agent in the component A is (25%-28%): (25%-28%): (2%-4%): (2%-3%): (2%-4%): (0.04%-0.08%), and the balance is water; and the component B comprises a sodium silicate aqueous solution. The material disclosed by the invention can be applied to a soft soil area, and the shield periphery pore filling material has good pumpability, so that the shield periphery pores can be quickly filled; and in addition, the reaction is rapid, the certain viscosity is achieved, and the final supporting performance reduction caused by solid-liquid separation of the shield periphery hole filling material in the reaction process can be avoided.

This invention belongs to the field of industrial solid waste resource utilization technology, and relates to a circulating fluidized bed ash-based cementitious material for road base courses and its preparation method. The raw materials for the road base course cementitious material are composed of the following mass parts: 29-43 parts of circulating fluidized bed ash, 16-27 parts of ground blast furnace slag, 3-6 parts of silica fume, 7-15 parts of P.O42.5 silicate cement, 0.1-0.4 parts of activator, and 27-30 parts of water. The circulating fluidized bed ash is prepared by mixing circulating fluidized bed fly ash and slag in a mass ratio of (2-5):(5-10). This invention effectively alleviates the problems of fast setting time and shrinkage cracking of traditional road base course cementitious materials by utilizing the characteristics of micro-expansion and long hydration time of circulating fluidized bed ash. The advantage of this invention is that it promotes the large-scale utilization of circulating fluidized bed ash and contributes to carbon emission reduction in the road sector.

This invention belongs to the field of mining engineering and geotechnical reinforcement technology, and discloses a coal and rock mass fracture grouting material suitable for long-distance transportation and its preparation method. The cement:fly ash:water ratio provided by this invention is 2:8:10. Experimental verification shows that it meets the performance requirements of grouting materials, with a grouting strength >1MPa meeting engineering requirements, and an initial setting time of 27h10min meeting the requirements for long-distance transportation. Furthermore, in terms of engineering cost, it utilizes waste fly ash from power plants to replace 80% of the cement, significantly reducing the cost of grouting materials and solving the environmental pollution problem caused by fly ash stockpiling. This invention can be considered the preferred mix ratio for grouting and roof reinforcement projects in coal mines directly overlying caving zones.

The invention discloses a construction method based on preparation of an ultrafast setting-fast setting-slow setting double-liquid grouting material. The construction method comprises the following steps: 1) respectively performing grouting plugging in three modes of ultrafast setting, fast setting and slow setting according to actual working condition requirements; (2) when the rapid plugging working condition needs to be met, phosphoric acid-water glass pre-gelatinization is conducted at the first position of the Y-shaped pipe, then pre-gelatinized slurry and cement are mixed to the third position of the Y-shaped pipe, and the gelatinization time is shorter than 15 s; (3) when a curtain grouting reinforcement working condition is needed, water glass slurry and cement are mixed to three positions of the Y-shaped pipe, a proper amount of conventional inorganic salt additives are added, and the gelling time is 25-50 s; and 4) when weak surrounding rock and a permeable rock-soil layer need to be subjected to grouting reinforcement, phosphoric acid is dissolved in water and converged in a second Y-shaped pipe, then the phosphoric acid and cement are prepared into cement grout, then the cement grout and water glass grout are mixed into a third Y-shaped pipe, and the gelling time is longer than 60s. The method has the advantages that the usage amount of additives is reduced, and the full-coverage grouting effect from ultrafast setting to slow setting is achieved.

The present application relates to the field of wastewater processing, and specifically discloses a method for preparing a silicate high-alkali wastewater activator for a mixing station, comprising the following steps: S1: first add p-aminobenzenesulfonic acid and water to a reactor, stir evenly, add soda ash, adjust the pH to 9-10, control the temperature at 25-30°C, then heat to 60-65°C, add p-carboxylphenol, then drop formaldehyde and hydrogen peroxide, stir evenly, warm to 85-90°C, keep warm for 1-2h, and cool to room temperature, i.e., prepare an aminosulfonic acid dispersant; S2: mix sodium gluconate, molasses, tricalcium aluminate, tetrasodium ethylenediaminetetraacetic acid, a capture agent, and an aminosulfonic acid dispersant evenly, i.e., obtain a silicate high-alkali wastewater activator for a mixing station. The present application has the effect of improving the dispersibility between a retarder and a chelating agent and cement particles, thereby improving the utilization efficiency of wastewater from a mixing station.

The present application relates to the field of concrete, and more specifically, it relates to a super slow setting concrete and a preparation method thereof. A super slow setting concrete comprises the following raw materials in parts by weight: 90-105 parts of water, 180-200 parts of Portland cement, 150-200 parts of admixtures, 1000-1200 parts of coarse aggregate, 700-800 parts of fine aggregate, 0-8 parts of admixtures, 15-25 parts of wheat straw liquid treatment, 8-15 parts of wheat straw solid treatment, and 1-6 parts of calcium carbonate whiskers; the preparation method of the wheat straw liquid treatment and the wheat straw solid treatment comprises the following steps: step 01: crushing wheat straw; step 02: soaking wheat straw in sodium hydroxide solution; step 03: solid-liquid separation of the material in step 02, the solid part is the wheat straw solid treatment, and the liquid part is the wheat straw liquid treatment. The present application has the advantages of improving early strength and good slow setting effect.

The invention discloses an organic alkali-activated geopolymer condensate as well as a preparation method and application thereof, and the method comprises the following steps: adding water glass, a surfactant and a defoaming agent into water, heating and uniformly stirring to obtain a micelle solution, and cooling to room temperature for later use; wherein the water glass accounts for 10-40.33% of the weight of the water, the surfactant accounts for 1-7.14% of the weight of the water, and the defoaming agent accounts for 0.17-1% of the weight of the water; adding organic alkali into the micelle solution, and uniformly mixing to obtain a mixed solution; wherein the organic base accounts for 1.83-11.67% of the weight of the water; weighing fly ash according to a water-to-fly ash water-to-water ratio of 0.3-0.35, pouring the fly ash into a stirring pot of a cement mortar stirrer, pouring the mixed solution into the stirring pot, and stirring and mixing to prepare the organic alkali-activated geopolymer condensate. The phenomenon of scumming is avoided, meanwhile, the compressive strength performance of the organic alkali-activated geopolymer condensate is remarkably improved, and the organic alkali-activated geopolymer condensate has very important practical significance for widening the application field of the geopolymer.

The application discloses an organic alkali-activated geopolymer solidified product, a preparation method and application thereof, and relates to the field of geopolymer solidified products.The method comprises the following steps: adding water glass, a surfactant and a defoaming agent into water, uniformly stirring and heating to obtain a micelle solution, and cooling to room temperature for standby use; wherein the water glass accounts for 10-40.33% of the weight percentage of water, the surfactant accounts for 1-7.14% of the weight percentage of water, and the defoaming agent accounts for 0.17-1% of the weight percentage of water; adding an organic alkali into the micelle solution, uniformly mixing to obtain a mixed solution; wherein the organic alkali accounts for 1.83-11.67% of the weight percentage of water; according to the water-glass ratio of 0.3-0.35, fly ash is weighed and poured into a stirring pot of a cement mortar stirrer, the mixed solution is poured into the stirring pot and stirred and mixed to prepare the organic alkali-activated geopolymer solidified product. Not only the "frosting" phenomenon is avoided, but also the compressive strength performance of the organic alkali-activated geopolymer solidified product is significantly improved, which has very great practical significance for widening the application field of geopolymer.