76 results about "Blended cement" patented technology

The invention discloses a preparation method of nano-modified recycled aggregate high-fluidity concrete, and belongs to the technical field of building materials. The method comprises the following steps: firstly, carrying out vibration screening, high-pressure water cleaning and low-temperature drying pretreatment on recycled coarse aggregate obtained by crushing waste concrete; then preparing a composite modified liquid containing nano silicon dioxide and nano calcium oxide, and ensuring that the nano material is uniform and stable by adopting an ultrasonic dispersion technology; soaking the pretreated aggregate in the modification liquid, promoting the nanometer material to deeply permeate in combination with pulse ultrasonic assistance and low-speed stirring, and performing gradient drying to obtain modified aggregate; finally, mixing the cement, the modified aggregate, the fine aggregate, the water, the water reducing agent, the nano reinforcing agent and the modified fiber according to an optimal proportion, stirring and forming step by step, and curing by a composite curing process. According to the invention, nano-composite modification and process collaborative optimization are utilized, so that the water absorption rate of the recycled aggregate is remarkably reduced, and the interface bonding force is enhanced.

The present disclosure relates to blended cement mixtures comprising a cement composition comprising a combination of Portland cement and reactive calcined gravel wash fines. The present disclosure further relates to methods of producing such cement mixtures comprising calcining gravel wash fines, and mixing the calcined gravel wash fines with Portland cement.

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.

Various aspects present advantageous composition with substituting SCMs in blended cements with vaterite at levels between 5% and 15%. In the cement-fly ash blends, the replacement of 10% of fly ash with vaterite resulted in a 40% increase in strength after 1 day, and the increased compressive strength persisted over a 56-day period when compared to the control cement-fly ash blend. Aspect systems may comprise a first reactor, operating at a first temperature, and configured to calcine limestone and produce Portland cement and a gaseous composition comprising carbon dioxide, a second reactor, operating at a second temperature which is lower than the first temperature, and configured to produce vaterite using a portion of the carbon dioxide, and a blending reactor configured to produce a cementitious blend comprising the Portland cement, the vaterite, and SCM.

Various aspects present advantageous composition with substituting SCMs in blended cements with vaterite at levels between 5% and 15%. In the cement-fly ash blends, the replacement of 10% of fly ash with vaterite resulted in a 40% increase in strength after 1 day, and the increased compressive strength persisted over a 56-day period when compared to the control cement-fly ash blend. Aspect systems may comprise a first reactor, operating at a first temperature, and configured to calcine limestone and produce Portland cement and a gaseous composition comprising carbon dioxide, a second reactor, operating at a second temperature which is lower than the first temperature, and configured to produce vaterite using a portion of the carbon dioxide, and a blending reactor configured to produce a cementitious blend comprising the Portland cement, the vaterite, and SCM.

To attempt reduction of a material cost and a CO2 discharge amount.SOLUTION: A CO2 mixed cement composition production method has a washing water acquisition step to acquire washing water for a residual cement composition left in a cement composition supply system, a recycled water acquisition step to acquire recycled water with aggregates of a particle diameter of 75 μm or more removed from the washing water, and a CO2 mixed cement composition production step to produce a CO2 mixed cement composition using solution that mixes CO2 into the recycled water as kneading water.SELECTED DRAWING: Figure 2

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.

The present disclosure relates to blended cement compositions comprising a combination of Portland cement and calcined bentonite. The present disclosure further relates to methods of producing such cement compositions comprising calcining bentonite, and mixing the calcined bentonite with Portland cement, where the calcined bentonite has a similar particle size distribution to the Portland cement.

The invention discloses a preparation method of environment-friendly mineral powder blended cement, and relates to the technical field of building materials. Abundant carbonation active sites are generated on the surface of mineral powder through the synergistic effect of CO2 partial pressure reaction grinding and gradient thermal activation, the crystal structure of the mineral powder is changed, a sufficient reaction basis is provided for a subsequent hydration reaction, and the mineral powder blended cement is prepared. The temperature-sensitive phase change microcapsules in the composite activator release Ca < 2 + > when cement is hydrated and heated to 45 DEG C, the Ca < 2 + >, the nano geopolymer precursor and the basic magnesium sulfate whiskers act together to induce to generate hydration products of carbonated datolite and magnesium silicate gel, and the products are interwoven to form a compact network structure, so that the temperature-sensitive phase change microcapsules in the composite activator can be used for preparing the composite activator. The internal binding force of the set cement is enhanced, and the pore structure is optimized, so that the cement has excellent mechanical property and durability.

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.]

Apparatus, systems, and methods for preparing foam cement compositions in a laboratory are disclosed. The apparatus includes a blender body, a base connector, an inlet port, a test port, an outlet port, a blender blade apparatus, and a blender cap. Systems to prepare foam cement compositions in a laboratory, include the apparatus, a first tubing assembly threaded to the inlet port configured to receive a pressurized gas and provide the pressurized gas to the apparatus, a second tubing assembly threaded to the test port, and a motorized base. Methods for preparing a foam cement composition using the apparatus for preparing foam cement compositions in a laboratory include adding a cement composition to the apparatus, fitting a blender cap on the apparatus, mixing the cement composition, and providing a pressurized gas and surfactant to the cement composition to produce a foam cement composition.

To aim to effectively utilize components with phosphorus adsorption functions to efficiently, that is, with good yield, control the size of the resulting adsorption composite particles, ensure that there are no adsorption materials that do not contribute to internal adsorption, achieve cost-effectiveness, and obtain phosphorus adsorption composite particles with sufficient strength.SOLUTION: A coating layer made of a binder is applied to the surface of granular carriers, and an adsorbent is arranged on this coating layer to form adsorbent composite particles. As the granular carrier, natural sand or artificial sand can be used. As the binder, cement selected from Portland cement, blended cement, or special cement can be used. As the adsorbent, a material capable of adsorbing phosphorus components can be used.SELECTED DRAWING: None

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.

According to the present invention, there is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end (111), the channel (103) for receiving a cementitious slurry from the mixing chamber (101). In the apparatus (100), the channel (103) extends from the first end (111) and terminates at at least one second end (112). The channel (103) comprises a first foam inlet (106) for introducing foam into the channel (103). The channel (103) further comprises a second foam inlet for introducing foam into the channel (103). The first foam inlet (106) and the second foam inlet are offset along the length of the channel (103). A method using the apparatus (100) is also described.

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.

Methods and systems for efficiently manufacturing particulate blending materials for use in making particle size optimized cements, SCMs, blended cements and cement-SCM blends. An initial hydraulic cement or SCM having an initial particle size distribution (PSD), an initial d10, and an initial d90 is processed using one or more air classifiers, and optionally one or more mills, to yield a plurality of hydraulic cement or SCM fractions having desired particle size distributions (PSDs). The hydraulic cement fractions can be blended with SCMs to form binary and ternary cement-SCM blends. The SCM fractions can also be used to make binary and ternary blends. A surplus fine cement fraction can be used to raise the fineness and / or reactivity of a less fine and / or less reactive hydraulic cement. A surplus fine SCM can be used as a silica fume substitute.

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.

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.

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 utility model relates to the technical field of elevator counter weights, in particular to a novel mixed cement elevator counter weight which comprises a shell with an opening in the upper end and a cover plate matched with the opening. The filter assembly is arranged in the shell and used for filtering heavy blocks in the filler, and the filter assembly is provided with at least one inlet end for filling the filler and at least one outlet end for discharging the filler. The filtering assembly is arranged in the shell, heavy blocks such as scrap iron in the filler can be treated in a centralized mode through the filtering assembly, the situation that the gravity center of an elevator balancing weight is not at an expected position due to the fact that the scrap iron is scattered in the shell in a disordered mode is avoided, and the stirred and mixed filler is poured into the inlet end of the filtering assembly; due to the fact that the size of the outlet end is smaller than that of the scrap iron, and other flowing materials in the filler are smaller than that of the scrap iron, only the scrap iron stays in the filtering assembly, and it is guaranteed that the gravity center position of the elevator balancing weight meets the expectation after pouring.

Various aspects present advantageous composition with substituting SCMs in blended cements with vaterite at levels between 5% and 15%. In the cement-fly ash blends, the replacement of 10% of fly ash with vaterite resulted in a 40% increase in strength after 1 day, and the increased compressive strength persisted over a 56-day period when compared to the control cement-fly ash blend. Aspect systems may comprise a first reactor, operating at a first temperature, and configured to calcine limestone and produce Portland cement and a gaseous composition comprising carbon dioxide, a second reactor, operating at a second temperature which is lower than the first temperature, and configured to produce vaterite using a portion of the carbon dioxide, and a blending reactor configured to produce a cementitious blend comprising the Portland cement, the vaterite, and SCM.

The invention discloses a granular fire extinguishing material as well as a preparation method and application thereof, and belongs to the technical field of fire extinguishing materials. The granular fire extinguishing material comprises glass beads with the diameter of 1-5 mm, glass bead fine powder with the diameter smaller than 1 mm, cement, water and a waterproof agent. The preparation method comprises the following steps: firstly, uniformly stirring the glass beads, the cement and the water; then adding the waterproof agent and uniformly stirring again; secondly, uniformly mixing by using a roller granulator, and putting the glass bead fine powder in batches; finally, the mixture is rolled into particles of 2-6 mm, the processing technology is simple, and the production cost is low. Wherein the glass beads are light materials, and the strength of the fire extinguishing material can be improved after the glass beads are mixed with the cement; and a certain amount of glass bead fine powder is doped, so that the weight of the fire extinguishing material is lighter. And after being used, the composite material can be repeatedly recycled without influencing the environment, so that the composite material is more environment-friendly.

The utility model belongs to the technical field of spraying devices, and discloses a cement spraying machine for earthwork engineering, which comprises a main body, a support frame is arranged on the bottom surface of the main body, an adjusting component for limiting the cement spraying area is arranged on the side surface of the support frame, and a spraying component for spraying cement is arranged on the top surface of the support frame. A movable cavity is formed in the main body, a stirring assembly used for uniformly mixing cement slurry is arranged in the movable cavity, rollers are arranged on the bottom surface of the supporting frame, the rollers are rotationally connected with the supporting frame, and through cooperation of an adjusting assembly and a spraying assembly, the device can adjust the slurry spraying area; the device can be adjusted according to the size of a road surface, the spraying thickness of slurry is more uniform, the stirring assembly can uniformly mix the slurry, the stirring assembly can be rotationally adjusted in the main body, cleaning of the stirring assembly is facilitated, and the practicability of the device is improved through the design.

A method (30) of continuous analysis of samples from a continuous bulk raw material stream comprises continuously diverting a fraction from the continuous bulk raw material stream of a production process to a sample processing and analysis apparatus (400; 700), and continuously processing, in the sample processing and analysis apparatus (400; 700), the diverted fraction (171) into a continuous sample raw material string or flow having predefined and constant properties. The continuous sample raw material string or flow is passed past an illumination zone or spot, which is illuminated by a light source (520) emitting infrared light. Light reflected by the continuous sample raw material string or flow at the illumination zone or spot is received in a sensor, and the properties of the reflected and / or transmitted light received at the sensor are analysed and evaluated.