36 results about "Blended cement" patented technology

A mixer and a method for the mixing of a cementitious slurry, configured to calculate the volume of the cementitious slurry in the mixer in order to produce an improved mixing process and / or an improved cementitious product. The mixer comprises a sensor to measure a parameter of the slurry in the mixer that is used to calculate the volume of slurry in the mixer.

The present invention provides a composite oxide that, when used to manufacture concrete, makes it possible to manufacture concrete with reduced autogenous shrinkage. The composite oxide includes CaO, MgO, and Al2O3 and is characterized in that: a basicity B3 is 1.4 or higher and 3.0 or lower, the basicity B3 being a value obtained by dividing a sum of a mass percentage of the CaO, a mass percentage of the MgO, and a mass percentage of the Al2O3 included in the composite oxide by a mass percentage of SiO2 included in the composite oxide; a total amount of iron included in the composite oxide is 0.4 mass% or more and 8.0 mass% or less; and a specific surface area of the composite oxide is 3000 cm2 / g or larger.

A hybrid cementing apparatus includes a mixing tub; a genset; variable frequency drives electrically coupled to the genset; a transfer switch electrically coupled to the variable frequency drives; electric motors electrically coupled to the variable frequency drives; and pumps mechanically coupled to the electric motors. At least one of the pumps is configured to pump cement out of the mixing tub.

A device for producing a concrete includes a cement premixer for mixing a cement suspension, the cement premixer having an ultrasonic probe for preparing a cement suspension, a crystallization tank arrangement with the first crystallization tank, for increasing the early strengths of the concrete, and a concrete mixer for producing a concrete mixture from the premixed cement suspension, in particular with the addition of aggregates.

The invention discloses quaternary mixed cement containing silica fume and a preparation method of the quaternary mixed cement, and relates to the technical field of building materials. 10%-18% of fly ash; 3%-8% of silica fume; through the synergistic effect of quaternary raw materials including the Portland cement clinker, the fly ash, the silica fume and the slag powder and in combination with precise raw material pretreatment, ingredient mixing, cement grinding and curing forming processes, the problems that traditional Portland cement is limited in later strength increase, insufficient in thermal stability and the like are effectively solved; the 3d compressive strength of the finished cement is larger than or equal to 26.0 MPa, the 28d compressive strength of the finished cement is larger than or equal to 50.0 MPa, the strength is stable, the performance is excellent, meanwhile, the silica fume is evenly dispersed, the pozzolanic effect of the silica fume is fully exerted, the thermal stability of a generated hydration product is superior to that of traditional cement, and the cement is suitable for high-strength and high-temperature-resistant engineering.

To provide a mixed cement composition that exhibits excellent compressive strength while using blast furnace slag, which has a low basicity. [Solution] The mixed cement composition contains Portland cement, blast furnace slag, and carbonate ester. The basicity calculated from formula (1) below based on the chemical composition of the blast furnace slag is 1.79 or less, and the gypsum content is 4.0% by mass or less in terms of SO3, based on the total amount of Portland cement, blast furnace slag, and gypsum. Basicity = (CaO + MgO + Al2O3) / SiO2 ... Equation (1) [In formula (1), CaO represents the content (mass%) of calcium oxide in the blast furnace slag, MgO represents the content (mass%) of magnesium oxide in the blast furnace slag, Al2O3 represents the content (mass%) of aluminum oxide in the blast furnace slag, and SiO2 represents the content (mass%) of silicon dioxide in the blast furnace slag.]

A 3D printing system for printing of cementitious material, comprising: a mixer configured to mix the cementitious material; a plurality of bins configured to hold and supply material to the mixer; a pump configured to provide the cementitious material to the deposition nozzle; a deposition nozzle configured to extrude cementitious material; a heating element in communication with the deposition nozzle, the heating element configured to transfer heat to the cementitious material within an interior portion of the mixing and deposition nozzle; and at least one sensor configured to generate temperature readings for the cementitious material; and a controller coupled with the at least one sensor, the pump and the bins, and configured to receive the temperature readings, and control the pump, the amount of material being supplied by the bins, and the heating element so as to ensure that the hardening process of the cementitious material is optimum.

The utility model relates to the technical field of building construction, and particularly discloses a cement mortar stirring device which comprises a support frame, a motor is fixedly connected to the support frame; an output shaft of the motor is fixedly connected with a stepped shaft; cement mortar raw materials to be mixed are put into the stirring container, then the driving unit drives the stirring shaft to descend to drive the stirring plate and the symmetrical cover plate to descend, the symmetrical cover plate seals and covers the stirring container, the stirring plate descends and enters the stirring container, and then the driving unit drives the stirring shaft and the stirring plate to rotate at a high speed to mix cement mortar. And then after mixing is completed, the driving unit drives the stirring plate to ascend to be separated from the stirring container, and the motor drives the stepped shaft, the transmission plate and the stirring container to slowly rotate and incline, so that the mixed cement mortar is obliquely poured out, the height of the poured-out cement mortar can be reduced, and the cement mortar pouring efficiency is improved. And therefore, the dumping efficiency is higher, and the dumping is more convenient.

The invention discloses a foundation treatment method for improving the horizontal bearing capacity of a pile foundation, and belongs to the technical field of foundation treatment.The foundation treatment method comprises the steps that cement grout or cement and water are added into graded broken stone or graded sandstone and stirred and mixed to be uniform, and backfill is formed; the backfill materials are backfilled in a layered mode in the foundation treatment area, each layer is compacted in a rolling mode, it is ensured that the compaction coefficient reaches a preset value, and a backfill layer is formed through maintenance; the precast pile is constructed in advance before backfilling; the cast-in-place pile can be constructed in advance before backfilling or constructed after a backfilling layer is completed. The cement grout or the cement and the water are mixed in the graded broken stone or the graded sandstone to form the backfill material, and the cement is filled in the gaps of the graded broken stone or the graded sandstone, so that the interior of the whole backfill layer is tighter, and the cement can form a whole with certain mutual cohesive force with the graded broken stone or the graded sandstone after being solidified; the compactness and lateral load resistance of soil around the pile foundation are improved, so that the horizontal bearing capacity of the pile foundation is improved.

Non-hydraulically reactive blended particulate compositions for use in making low carbon blended cement or low carbon concrete include a pozzolanic component having a first D90 and a mineral filler component having a second D90 greater than the first D90 dry blended without intergrinding, wherein the composition is free of hydraulic cement. The pozzolanic component can have a D90 less about 45 μm and the mineral filler can have a D90 greater than about 45 μm. The pozzolanic material can be fly ash, bottom ash, metallurgical slag, silica fume, metakaolin, volcanic ash, natural pozzolan, calcined shale, calcined clay, and / or ground glass. The mineral filler component can be aggregate fines, quarry fines, limestone powder, granite fines, stone dust, rock dust, marble dust, mine tailings, pulverized bottom ash, pulverized metallurgical slag, ground recycled concrete, pulverized shale from shale oil extraction, or pulverized sand from tar sand extraction.

This invention discloses an accurate method for predicting the hydration kinetics of solid waste-based cement, relating to the field of building materials technology. The method includes the following steps: S1, preparing solid waste-based cement slurry samples, conducting hydration reactions under sealed conditions, and using low-field nuclear magnetic resonance (NMR) technology to detect and quantify the hydration degree data of the cement slurry samples at different time points in real time; S2, fitting a hybrid cement hydration kinetics model based on the hydration degree data obtained in step S1 to determine the parameters of the hybrid model; S3, using the parameterized hybrid cement hydration kinetics model determined in step S2 as a priori mean function, integrating it into a Gaussian process regression model, and using the hydration degree data obtained in step S1 as a training set to train the Gaussian process regression model, obtaining a fused cement hydration kinetics prediction model, used to output the predicted hydration degree of the target solid waste-based cement system within and outside the training data range.

Non-hydraulically reactive blended particulate compositions for use in making low carbon blended cement or low carbon concrete include a pozzolanic component having a first D90 and a mineral filler component having a second D90 greater than the first D90 dry blended without intergrinding, wherein the composition is free of hydraulic cement. The pozzolanic component can have a D90 less about 45 μm and the mineral filler can have a D90 greater than about 45 μm. The pozzolanic material can be fly ash, bottom ash, steel slag, silica fume, metakaolin, volcanic ash, natural pozzolan, calcined shale, calcined clay, and / or ground glass. The mineral filler component can be aggregate fines, quarry fines, limestone powder, granite fines, stone dust, rock dust, marble dust, mine tailings, pulverized bottom ash, pulverized metallurgical slag, ground recycled concrete, pulverized shale from shale oil extraction, or pulverized sand from tar sand extraction.

The application relates to the technical field of building mechanical equipment, in particular to a composite mortar stirring and conveying device and method capable of multi-directional rotation stirring, which comprises a base, a material groove is connected to the top of the base, a spiral conveying shaft is rotatably connected in the material groove, a motor I is installed at the back of the material groove, the output shaft of the motor I is connected with the spiral conveying shaft, a mounting frame is installed at the back of the top of the base, and a stirring and mixing mechanism is arranged on the mounting frame. The cement and sand in the material cylinder can be stirred and mixed through the forward and reverse alternating rotation of the stirring plate, the purpose of preparing the dry mixed mixture of the cement and sand through preliminary stirring is achieved, the cement and sand can be uniformly stirred and mixed in advance, the quality of the composite mortar is improved, the cement and sand are alternately premixed between the two material cylinders, the work continuity of the preparation of the dry mixed mixture of the cement and sand can be ensured, the work continuity of the preparation and conveying of the composite mortar can be ensured, and the work efficiency is improved.

The present invention relates to a method for manufacturing a silicate-based powder-type penetrating coating waterproofing material and a silicate-based powder-type penetrating coating waterproofing material produced thereby. By mixing cement, ready-mix mortar, and a penetrating waterproofing liquid at the site, a silicate-based powder-type penetrating coating waterproofing material is prepared and installed that satisfies the KS F 4918 standard while having excellent workability and economic efficiency. The present invention is characterized by manufacturing a silicate-based powder-type penetrating coating waterproofing material that exhibits waterproofing performance in accordance with KS F 4918 by forming a composite waterproofing layer that prevents aggregation of cement and ready-mix mortar during the mixing process and watertightly seals the pores of the concrete substrate during construction, by mixing a penetrating waterproofing liquid containing an acrylic binder and having characteristics of a particle size of 70 to 400 nm and a molecular weight of 20,000 to 200,000 with cement and ready-mix mortar in a predetermined ratio.

A concrete emulsion comprising a cement, aggregate, water, and carbon dioxide is provided. The carbon dioxide may be liquid or supercritical and is dispersed in the concrete emulsion composition. A method of producing a concrete emulsion composition is also provided. The method includes mixing a cement, aggregate, and water to form a hydrated concrete composition, and emulsifying the hydrated concrete composition with liquid or supercritical CO2. An article comprising the concrete emulsion composition is provided. Further, a method of treating a wellbore comprising producing a concrete emulsion composition and pumping the concrete emulsion composition into a wellbore, and a method of manufacturing an article comprising producing a concrete emulsion composition and 3D printing the concrete emulsion composition are also provided.

The application provides a preparation process of concrete with tunnel hole slag as raw material. The preparation process of concrete with tunnel hole slag as raw material comprises the following steps: crushing the tunnel hole slag and performing primary screening; finely crushing and preparing machine-made sand through a single production process; dry mixing main materials such as cement; mixing basalt fibers and polypropylene fibers; and preparing a mixed solution and stirring and mixing. The application can improve the impermeability and frost resistance of the prepared concrete by mixing and doping basalt fibers and polypropylene fibers which have acid and alkali resistance.

The invention provides a manufacturing method, a management system and a method of a carbon neutralization intelligent green and environment-friendly module capable of recycling cyclic resources, according to the invention, sand, broken stones and stone powder are recycled as materials capable of being recycled after a building is disassembled to 70%, and the recycling rate of the carbon neutralization intelligent green and environment-friendly module is improved. New steel wires (steel grit), new gravels and environment-friendly byproducts are mixed with basic ash in the recyclable materials (recycling resources), and the manufacturing effect of carbon neutralization blocks is achieved through the manufacturing technology of mixing cement, modules, shaft belt modules, gravity type blocks and large-scale environment-friendly blocks. Through additional configuration, power can be saved and managed, not only carbon can be saved, but also carbon emission permissions can be sold.

The concrete production line added with the chopped fibers comprises a concrete stirring device and further comprises a powder stirring tank, the powder stirring tank is used for mixing cement powder and the chopped fibers, and the discharging end of the powder stirring tank is connected to the feeding end of the concrete stirring device. According to the concrete production line added with the chopped fibers, the powder stirring tank is creatively arranged, the chopped fibers and cement powder are fully mixed firstly, and the procedure that the chopped fibers are directly input into a concrete stirring device in the traditional process is changed. As the cement powder has certain adhesion and fluidity, the chopped fibers can move along with the cement ash in the powder stirring tank, and the problem that the chopped fibers are difficult to be fully mixed with the stone due to light weight and smooth surface is avoided. Compared with the traditional mode of directly adding the fibers into the concrete stirring device, the dispersion uniformity of the chopped fibers in the concrete is greatly improved, so that the fibers are more uniformly distributed in the concrete.

To provide a novel integrated facility that includes land-based aquaculture equipment and cement-based product manufacturing equipment. [Solution] The integrated facility 1 comprises a land-based aquaculture facility 10 for cultivating fish, shellfish, and algae on land, and a cement-based product manufacturing facility 20 for manufacturing cement-based products. The cement-based product manufacturing facility 20 includes a material mixing means for mixing cement, and a farming water introduction means for introducing used farming water used in the tanks 11 of the land-based aquaculture facility 10 into the material mixing means.

The invention belongs to the technical field of solid waste treatment, and particularly relates to a method for determining the type and content of solid wastes in a composite admixture, blended cement and a preparation method of the blended cement. According to the invention, n solid wastes are used as raw materials, and the composition of elements and oxides of various solid wastes and reference cement is accurately obtained through detection; the method comprises the following steps: taking a cement function mirror image as a core guide, recarving a hydration function and performance system of reference cement, and enabling a core oxide system of the multi-element solid waste composite admixture to be matched with the reference cement on the basis of an oxide system synergistic matching principle; a multi-parameter constraint coupling model of alkalinity coefficient, mineral formation coefficient, active component content and the like is constructed, the optimal mass ratio of each solid waste is solved and determined through simultaneous solving of linear equations, and finally the composite admixture capable of replacing part of cement is formed. According to the method provided by the invention, experiential trial and preparation are not needed, accurate synergistic utilization of the multi-element solid waste is realized, the key performance of the replaced cementing material is matched with that of standard cement, and the performance of the cement is not influenced.

The present invention relates to a cement additive for use in a blended cement composition, the additive comprising a precipitated calcium carbonate formed from mineral sequestration of carbon dioxide.

Environmentally friendly concrete compositions and methods thereof are disclosed. For example, a method for producing an environmentally friendly concrete installation can include mixing cement, one or more locally sourced pozzolans, and one or more locally sourced aggregates to produce a dry concrete mixture. At least one fine aggregate or coarse aggregate of the dry concrete mixture is a locally sourced aggregate of the one-or-more locally sourced aggregates for a reduced carbon footprint. The method can include hydrating the dry concrete mixture with water to make a pourable concrete mixture. The method can include pouring the pourable concrete mixture into a formwork to produce a poured concrete form. The method can include allowing the poured concrete form to cure to produce the concrete installation. The reduced carbon footprint of the concrete installation is relative to that of a similar concrete installation produced without the one-or-more locally sourced pozzolans or aggregates.

This invention discloses a self-healing concrete crack-resistant agent and its preparation method, belonging to the field of concrete repair agents. The raw material components of the self-healing concrete crack-resistant agent include silane-treated mixed cement, cellulose xanthate-treated quartz sand, nano-silica, and anhydrous citric acid. The self-healing concrete crack-resistant agent of this invention not only improves the strength of concrete after coating but also increases the strength recovery rate of concrete after repair. The compressive strength recovery rate of the repaired concrete is 112.8-113.2%, and the flexural strength recovery rate is 114.6-115.3%.

The invention discloses concrete with a slow-release polycarboxylic acid water reducer for reducing cement consumption and a preparation method of the concrete, and relates to the field of concrete engineering and green building materials.The preparation method comprises the steps that the slow-release polycarboxylic acid water reducer containing composite hydrolyzable groups is prepared, firstly, monomers such as polyethylene glycol monomethyl ether, acrylic acid and itaconic acid monobutyl ester are polymerized, and mother liquor is prepared; and then compounding with L-dimethyl aspartate, nano calcium carbonate and other components to form a finished product of the water reducing agent. The concrete is prepared by adopting a staged stirring process, firstly, the aggregate is wetted, then the water reducing agent is added, and finally, the cement and the remaining water are mixed. Through gradient slow release of composite functional groups, anti-mud-slow release synergy and a nanocrystal nucleus strengthening mechanism, accurate matching of slow release and cement hydration is realized, the problems of cement decrement and strength guarantee, slow release effect attenuation in mud-containing aggregate and process compatibility are solved, the use amount of cement is reduced, the workability and mechanical properties of concrete are guaranteed, and the service life of the concrete is prolonged. The green emission reduction requirements are met.

To provide a mixed cement composition that contributes to CO2 reduction and exhibits excellent initial compressive strength. [Solution] The mixed cement composition comprises Portland cement, blast furnace slag, and carbonate ester. The carbonate ester may contain cyclic carbonates.

This invention discloses a slow-release polycarboxylate superplasticizer for concrete with reduced cement content and its preparation method, relating to the fields of concrete engineering and green building materials. It involves preparing a slow-release polycarboxylate superplasticizer containing composite hydrolyzable groups. First, monomers such as polyethylene glycol monomethyl ether, acrylic acid, and itaconic acid monobutyl ester are polymerized to obtain a mother liquor. Then, L-aspartic acid dimethyl ester, nano-calcium carbonate, and other components are compounded to form the finished superplasticizer. The concrete preparation employs a staged mixing process: first, the aggregate is wetted, then the superplasticizer is added, and finally, cement and remaining water are mixed. This invention achieves precise matching between slow release and cement hydration through a gradient slow release mechanism of composite functional groups, anti-mud-slow release synergy, and nanocrystalline nucleus strengthening mechanism. This solves the problems of cement reduction and strength preservation, attenuation of the slow release effect in mud-containing aggregates, and process compatibility. While reducing cement usage, it ensures the workability and mechanical properties of concrete, meeting the requirements for green emission reduction.

A method of manufacturing a blended cement, including a step of co-grinding Portland clinker and cementitious waste material in the presence of a grinding aid selected from alkanolamines, glycols, glycerol, carbohydrates, chlorides, or mixtures thereof. Blended cements obtainable in such method. The use of an admixture selected from alkanolamines, glycols, and / or glycerol to increase the performance after hardening of a blended cement including Portland clinker and a supplementary cementitious material retrieved from cementitious waste material.

A hybrid cementing apparatus includes a mixing tub; a genset; variable frequency drives electrically coupled to the genset; a transfer switch electrically coupled to the variable frequency drives; electric motors electrically coupled to the variable frequency drives; and pumps mechanically coupled to the electric motors. At least one of the pumps is configured to pump cement out of the mixing tub.

The application discloses an integrated sludge treatment device, and relates to the technical field of sludge treatment, which comprises a mixing box for mixing sludge and cement to form a sludge mixture, a stirring barrel for mixing cement and water to form a cement mixture, an extrusion head, and a waste barrel. The extrusion head is internally provided with a first material channel for extruding the sludge mixture and a second material channel for extruding the cement mixture. The extrusion head is used for extruding a solidified body in the waste barrel. The solidified body comprises an inner core of the sludge mixture and a shell of the cement mixture wrapped outside the inner core. The integrated sludge treatment device is used for treating sludge containing radioactive substances to obtain the sludge mixture. The extrusion head forms the shell of the cement mixture outside the sludge mixture through a segmented extrusion mode, improves the forming efficiency of the solidified body, and makes the solidified system of the shell of the cement mixture more stable, so that the sludge can be further isolated, and the risk of nuclide leaching and migration is reduced.

Provided is a composite oxide with which it is possible to produce a concrete having reduced self-shrinkage during the production of the concrete. The composite oxide contains CaO, MgO, and Al2O3, and has an alkalinity B3 of 1.4 to 3.0 inclusive, the alkalinity B3 being a value obtained by dividing the sum of the mass% of CaO, the mass% of MgO, and the mass% of Al2O3 contained in the composite oxide by the mass% of SiO2 contained in the composite oxide, the total amount of iron contained in the composite oxide being 0.4 to 8.0 mass% inclusive, and the sum of the mass% of CaO, the mass% of MgO, and the mass% of Al2O3 contained in the composite oxide being 0.4 to 8.0 mass% inclusive. The composite oxide has a specific surface area of 3000 cm2 / g or more.