108 results about "Pozzolan" patented technology

Pumpable slurry compositions including at least one aluminosilicate additive and optional pozzolanic cement additives and methods including the pumpable slurry compositions improve development of compressive strengths in the pumpable cement slurry compositions. The methods utilize one or more pumpable cement slurry compositions including at least one cement component, water, at least one first aluminosilicate additive, at least one optional second aluminosilicate additive, and one or more optional pozzolanic additives, where the at least one first aluminosilicate additive has an amorphous phase of greater than about 50% and a weight ratio of silica oxide to aluminum oxide of about 1.0 to about 2.5, and the at least one optional second aluminosilicate additive has a weight ratio of silica oxide to aluminum oxide of about 1.7 to about 3.3.

The invention belongs to the technical field of negative carbon building materials, and particularly relates to a multi-element solid waste negative carbon cement-based material and a preparation method thereof. The material is prepared from the following components in parts by weight: 10 to 320 parts of carbonized carbide slag, 0 to 240 parts of uncarbonized carbide slag, 25 to 640 parts of calcined coal gangue, 25 to 800 parts of Portland cement, 6 to 320 parts of silica fume and other pozzolanic mineral admixtures and 30 to 800 parts of mixing water. The preparation method comprises the following steps: carbonizing the carbide slag until the content of calcium carbonate is more than or equal to 90%, and calcining and activating the coal gangue at 700-800 DEG C; all the powder raw materials are subjected to dry mixing, water is added for segmented stirring, and standard curing is performed after pouring forming. The carbonized carbide slag is used for replacing limestone to achieve carbon sequestration, the calcined coal gangue is used for replacing calcined clay, natural resources are prevented from being exploited, the cement clinker replacement rate of 70% is achieved through the synergistic effect of multi-element solid waste in a low clinker system, the material has excellent mechanical and durability, and carbon emission and resource consumption are remarkably reduced.

The present disclosure relates to shaped cementitious compositions that comprise a substrate for aquatic flora and / or fauna attachment; methods for providing a substrate for aquatic flora and / or fauna attachment comprising depositing a shaped cementitious composition into a body of water; and methods for making a shaped cementitious composition. The shaped cementitious composition is formed from a pourable cementitious mixture comprising: (a) a pozzolan comprising a natural pozzolan and / or a manmade pozzolan; (b) MgO and / or Mg(OH)2; (c) an aqueous solution comprising one or more accelerants; and (d) at least one aggregate. In some cases, the MgO and / or Mg(OH)2 of (b) is included in the aqueous solution of (c). And, in various cases, the manmade pozzolan comprises a slag.

The invention discloses a low-carbon composite cementitious material, a mortar preparation method and application, and the low-carbon composite cementitious material comprises the following raw materials by weight: 50%-85% of cement, 15%-50% of Yellow River mud sand micro powder, 0%-0.75% of a sodium hydroxide activator, and 0%-7.5% of a calcium hydroxide activator. The method has the beneficial effects that the specific surface area of the Yellow River mud sand is influenced through mechanical grinding, more nucleation sites are generated on the surface of the Yellow River mud sand, the subsequent hydration reaction of the Yellow River mud sand and cement is promoted, and the Yellow River mud sand is easy to form micro-group aggregation through grinding, so that internal pores are filled, the porosity is reduced, and the strength is improved; and through the composite excitation effect of the two alkali activators, the generation of C-S-H and C-A-S-H gels is promoted, the pore size distribution is refined, the microstructure is improved, and the potential volcanic ash or activity of sediments is excited to the maximum extent.

The invention relates to the technical field of building materials, and discloses a preparation method of a functional additive of antibacterial and mildew-proof dry-mixed putty mortar, which comprises the following steps: dispersing an inorganic porous carrier in water, and adding a plant polyphenol solution for adsorption loading; then adding soluble silicate, adjusting the pH value of the system to be acidic or weakly acidic, and carrying out in-situ gelation reaction to form a silica gel blocking layer on the surface of the carrier; and adding a metal salt solution to carry out heating coordination reaction, and carrying out solid-liquid separation, washing, drying and crushing to obtain a finished product. Intelligent slow release and oxygen isolation protection of active components are achieved by constructing a pH response type silica gel layer and a metal-polyphenol coordination network, the additive effectively solves the problems of serious delayed coagulation and oxidation discoloration caused by plant polyphenol in an alkaline putty system, an active silicon source generated by dissolution of the silica gel layer can be subjected to a pozzolanic reaction, and the pH response type silica gel layer and the metal-polyphenol coordination network can be used for preparing the alkaline putty. The bonding strength of the putty layer is obviously improved.

The application discloses a concrete production method, comprising the following steps: step 1, determining the quantity of materials needed to be added to ordinary concrete according to the required compressive strength of the roller compacted concrete; step 2, sequentially adding the required materials into the ordinary concrete and performing roller compacting mixing in the concrete; step 3, adding an admixture into the concrete obtained in step 2 through a low-temperature high-pressure spraying mixing mode; and step 4, adding asphalt into the concrete obtained in step 3 and uniformly mixing to obtain the roller compacted concrete. Further, the materials comprise stone powder, fly ash and pozzolanic admixture. The application increases the hardness and compressive strength of the ordinary concrete through material adding and process treatment, so that the roller compacted concrete can be produced on site when the demand is small, and factory ordering is not needed, thereby saving the construction cost.

Pumpable slurry compositions comprising at least one aluminosilicate additive and optional pozzolanic cement additives and methods for improving development of compressive strengths in the pumpable cement slurry compositions are disclosed herein. The methods utilize one or more pumpable cement slurry compositions comprising at least one cement component, water, at least one first aluminosilicate additive, at least one optional second aluminosilicate additive, and one or more optional pozzolanic additives, wherein the at least one first aluminosilicate additive has an amorphous phase of greater than about 50% and a weight ratio of silica oxide to aluminum oxide of about 1.0 to about 2.5, and the at least one optional second aluminosilicate additive has a weight ratio of silica oxide to aluminum oxide of about 1.7 to about 3.3.

This invention discloses a high-elasticity modulus concrete and its preparation method. The high-elasticity modulus concrete comprises, by weight, cementitious materials: volcanic rock: river sand: water: water-reducing agent in a ratio of 575:990:755:115:(20-22). The cementitious materials, by weight, comprise: cement: fly ash: silica fume in a ratio of (375-435):85:55. This invention utilizes volcanic rock as coarse aggregate to construct a rigid skeleton, and incorporates cementitious materials to leverage their synergistic physical filling and volcanic ash effect, optimizing the matrix density and interfacial transition zone structure. Combined with ultrasonic-assisted mixing, it achieves uniform dispersion and efficient hydration of fine materials. This concrete exhibits high compressive strength and high elastic modulus, demonstrates low shrinkage and creep characteristics, good volume stability, and excellent durability. It is suitable for high-rise and super high-rise buildings and large-span structural engineering, significantly improving structural stiffness, saving building materials, and increasing usable space utilization.

The application provides an adsorption-induced transmission type hydraulic lime suspension and a preparation method thereof, and belongs to the technical field of building materials. The application uses the knowledge of suspension particle dynamics, selects spherical micro-nano pozzolanic materials as the hydraulic component to promote the kinetic stability of the hydraulic lime suspension and the permeability of the hydraulic lime suspension in the earthen site. However, the specific surface area of the regular spherical particles is relatively small, the adsorption in the earthen site is small, and the regular spherical particles are prone to return migration to the surface of the earthen site to form whitening as the solvent evaporates. The application uses the alkali activation and hydrothermal synthesis method to load the silicon / aluminum gel and zeolite with super-large specific surface area on the surface of the pozzolanic material, plays an adsorption-induced transmission role, realizes the deep penetration of the hydraulic lime suspension in the earthen site, and avoids the return migration phenomenon.

Method for manufacturing composite cement, wherein a supplementary cementitious material is obtained from a marine sediment deposit fed by erosion of volcanic rock to form sedimented pozzolan by dredging the sediment deposit, dewatering the dredged sedimented pozzolan to a water content of below 20 wt.-% with respect to the total weight of sedimented pozzolan and water, washing the sedimented pozzolan with fresh water to a chloride content below 0.2 wt.-% with respect to the total solids, and drying to provide the supplementary cementitious material, and mixing the supplementary cementitious material with a hydraulic cement to provide the composite cement, as well as use of the obtained supplementary cementitious material for making composite cements and supplementary cementitious material and composite cement obtainable by the method or use.

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.

This invention discloses a high-fire-resistant concrete, characterized by being composed of the following components in parts by weight: 20-25 parts cement, 30-35 parts crushed stone, 10-25 parts river sand, 10-12 parts volcanic ash, 10-20 parts water, 1-3 parts epoxy-propionic acid modified octa-tetramethylcyclotetrasilazane, 0.3-0.6 parts guanidine carbonate, 1-3 parts calcium borate, 0.5-1 part waste polyarylene diazole fiber, and 0.1-0.3 parts 3-chloro-2-hydroxypropanesulfonic acid modified 2,5-bis(diethylamino)phenyl-1,3,4-diazole. This invention also discloses a method for preparing the aforementioned high-fire-resistant concrete. The high-fire-resistant concrete disclosed in this invention exhibits high fire resistance, good workability, excellent comprehensive performance, impermeability and crack resistance, durability, and high compressive strength.

The invention relates to the technical field of chemical engineering, in particular to an alkali efflorescence-resistant cement-based impervious coating material which comprises a base material and an active substance, and the base material comprises, by weight, 60-70 parts of a cementing material, 30-40 parts of an auxiliary cementing material and 40-60 parts of aggregate. The active substances comprise 1-1.5 parts of a precipitator, 2-3 parts of a complexing agent, 1-1.5 parts of an early strength agent, 4-6 parts of a calcium ion compensating agent, 1.5-2 parts of a dispersing agent and 1-1.5 parts of other auxiliaries. According to the method, alkali-aggregate reaction is reduced by means of not introducing alkali metal ions, the concentration of soluble calcium salt generated in the curing process is reduced through the pozzolanic effect generated when bulk industrial waste with high silicon content meets water, so that the adverse effect caused by saltpetering is reduced, and meanwhile, under the synergistic effect of various active substances, the curing effect is improved. The compactness and the impermeability of the coating are obviously improved.

A binder composition including: (a) between 10% and 49% in dry weight of Portland cement, lime or a mixture thereof; (b) between 10% and 49% in dry weight of at least one pozzolanic material; (c) between 21% and 80% in dry weight of at least one filler; (d) between 0.1% and 10% in dry weight, relative to the total weight of components (a), (b) and (c), of at least one activator; (e) between 0.05% and 1.5% in dry weight, relative to the total weight of components (a), (b) and (c), of at least one rheology enhancing admixture. The filler is a particles mixture of: between 10% and 100% in weight, in respect with the total weight of the filler, of particles having a d50 greater than or equal to 0.05 μm and strictly less than 8 μm, and between 0% and 90% in weight, in respect with the total weight of the filler, of particles having a d50 greater than or equal to 8 μm and less than 200 μm.

The invention relates to a method for measuring the reactivity of pozzolanic materials and correlating this reactivity with strength development in composite cement. The method comprises dissolving pozzolanic materials in an alkaline solution and preparing a 1.0–5.0 M Sodium Hydroxide (NaOH) solution. This solution, containing the dissolved materials, is placed on a flow cell, configured to accommodate particles up to 100 µm. The flow cell is heated between 20 °C and 70 °C, and optical images of the particles are collected using an optical microscope. Particle count and area are measured by image processing with spatial and morphological filters to identify particles in the solution over time. The change in particle count or area is computed, and the normalized count represents dissolution plotted over time, describing the dissolution rate. This particle dissolution behaviour is correlated with compressive strength data obtained from samples tested within 1–28 days.

An additive agent comprising pozzolan and methylcellulose, for the preparation of a concrete mixture of a hygroscopic vegetal-based concrete material comprising lime and the additive agent is described herein. The lime may be hydrated lime and the pozzolan may be a metakaolin. Proportions of each element are between 50% to 80% by weight of lime, between 20% and 50% by weight of pozzolan and between 0.3% and 1.5% by weight of methylcellulose. A concrete mixture and a solid concrete material made from such mixture include hemp hurds as an aggregate. The additive agent may also be used in the preparation of a concrete mixture or of a binder formulation for use in the concrete mixture. A variety of applications including prefabricated construction components are made from this material.

The invention relates to the technical field of well cementation materials, and particularly discloses a preparation method and application of a high-temperature set cement strength decline inhibitor. The inhibitor is prepared by adopting a two-step chemical modification method, a silane modifier is taken as a standard, an active aluminum-containing material, an activator, an alkaline modifier and a solvent are matched, and a composite functional material with a core-shell structure is constructed through the steps of silicate hydrolysis, surface grafting of the active aluminum-containing material, secondary modification in an alkaline environment and the like. The material can effectively inhibit strength decline of set cement in a high-temperature environment of 180 DEG C or above, the strength is higher than 40 MPa after curing for 28 days at 240 DEG C, the influence on the thickening time of cement paste is less than 65 minutes when the addition amount of the material is 10%, meanwhile, the rheological property of the cement paste is basically not interfered, and the material is suitable for high-temperature well cementation operation of deep wells, ultra-deep wells, thermal production wells and the like. The aluminum-containing volcanic ash material has high-temperature stability and construction friendliness, and solves the technical problems that the thickening time is shortened and the pumping risk is increased in the traditional aluminum-containing volcanic ash material.

A method of producing a hydraulic cement composition, comprising - providing a raw material that comprises > 18 wt.-% kaolinite, ≥ 15 wt.-% calcite and a combined content of muscovite and illite of < 20 wt.-%, - calcining the raw material to obtain a pozzolanic material, - mixing the pozzolanic material with Portland cement clinker so that the cement composition comprises > 50 wt.-% of the pozzolanic material and < 45 wt.-% of the Portland cement clinker.

This disclosure methods of sealing water-bearing formations using a sealant composition, including volcanic ash, cement, an epoxy resin, and a crosslinker.

The invention discloses steel slag sand fine grain tailing composite filling mortar and a preparation and use method thereof, and belongs to the technical field of tailing cemented filling materials. Raw materials of the mortar comprise fine grain tailings, steel slag sand, a magnetic volcanic ash binding material, a gel breaker and an ultrafine particle capturing agent, the magnetic volcanic ash binding material comprises magnetic powder particles, the residual magnetic induction intensity of the magnetic powder particles is 0.15-2.5 mT, and the mass of the magnetic powder particles accounts for 5-10% of the total mass of the magnetic volcanic ash binding material. By adopting the magnetic volcanic ash cementing material, other particles can be driven to approach to steel slag sand together to form an aggregate by utilizing the magnetic aggregation and magnetic effects of the magnetic volcanic ash cementing material and fine weakly magnetic particles in the tailings, so that the situation that the strength distribution of a consolidation body is not uniform due to different gravity settling velocities of fine sand and the fine tailings is avoided; therefore, the strength of the filling body can be remarkably improved, and meanwhile the using amount and filling cost of the cementing material are reduced.

Pumpable slurry compositions comprising at least one aluminosilicate additive and optional pozzolanic cement additives and methods for improving development of compressive strengths in the pumpable cement slurry compositions are disclosed herein. The methods utilize one or more pumpable cement slurry compositions comprising at least one cement component, water, at least one first aluminosilicate additive, at least one optional second aluminosilicate additive, and one or more optional pozzolanic additives, wherein the at least one first aluminosilicate additive has an amorphous phase of greater than about 50% and a weight ratio of silica oxide to aluminum oxide of about 1.0 to about 2.5, and the at least one optional second aluminosilicate additive has a weight ratio of silica oxide to aluminum oxide of about 1.7 to about 3.3.

This disclosure methods of sealing water-bearing formations using a sealant composition, including volcanic ash, cement, an epoxy resin, and a crosslinker.

The application discloses a concrete track slab mixing material and a preparation method, relates to the technical field of high-speed railway component construction, and through the nucleation effect of a nanocrystalline core early strength agent, the cement hydration process is greatly accelerated, the compressive strength of sleeper concrete is significantly improved after 12h of steam curing, the 1d activity index far exceeds the standard requirement, the rapid demolding requirement of the sleeper is met, and defects such as corner drop and cracks are effectively reduced; the pozzolanic effect of superfine mineral powder and silica fume is continuously exerted, the micro aggregate filling effect of a high polymer viscosity reducer is used, the later strength of the concrete continuously grows, meanwhile, the dense filling effect of the high polymer viscosity reducer makes the internal structure of the concrete more compact, the chloride ion penetration resistance and the frost resistance are significantly improved, and the service life of the sleeper is prolonged.

In the present disclosure, a cement board is disclosed. The cement board comprises a core having a first surface and a second surface opposite the first surface and a binder including a pozzolan material and a water-resistant additive, wherein the water-resistant additive is present in an amount of less than 5 wt. % based on the weight of the pozzolan material.

Cement compositions including ordinary Portland cement, a secondary cementitious material (SCM) including one or more of pozzolan, metakaolin, limestone, or gypsum in an amount of up to approximately 70% of a replacement level of ordinary Portland cement, and between approximately 0.05% by weight of cement (bwoc) and 2% bwoc of aggregates of mesoporous carbon nanoparticles (3DG) carbons. The cement compositions regulate nucleation and time-lapsed growth of calcium silica hydrates during initial hydration. The 3DG carbons include aggregates of mesoporous carbon nanoparticles, which include one or more interconnected bundles of electrically conductive graphene layers. The 3DG carbons include oxygen containing functional groups disposed on one or more of the surfaces of the 3DG carbons or within the 3DG carbons.

The invention comprises a method of making lime, dolomitic lime, hydraulic cement such as portland cement clinker and co-products such as pozzolan, acids, alumina, silica and the like. The method comprises providing a natural calcium-iron-aluminosilicate mineral from one or more of hyaloclastite, lava, scoria, volcanic glass, volcanic ash, or any other mineral of a basaltic or intermediate chemical composition and reacting the hyaloclastite with a first hydrochloric acid to create a first salt, precipitating the calcium ions to react with OH− to form calcium hydroxide and heating the calcium hydroxide to create calcium oxide, alite and belite.

A method of producing a pozzolanic material for use in a low-carbon cement, comprising: providing a raw material comprising - a hydrous aluminum phyllosilicate that comprises at least 5 wt.% montmorillonite and - at least 1 wt.% of at least one high-temperature polymorph of silica, wherein the raw material is substantially free from kaolinite, calcining the raw material at a temperature of 500-900°C in order to obtain the pozzolanic material.

Methods and systems for calcining dewatered tailings and / or mine waste are disclosed herein. In some embodiments, the method comprises (i) processing dewatered tailings comprising clay minerals, (ii) calcining the processed tailings to produced calcined tailings, and (iii) altering a composition and / or one or more characteristics of the calcined tailings to produce a cementitious product. Altering the composition can include blending the calcined tailings with one or more additives, such as lime, dolomitic lime, lime kiln dust, argillaceous limestone, limestone, pulverized quicklime, ground calcium carbonate, quicklime, gypsum, natural pozzolans, artificial pozzolans, water, flow aids, or the like.

A method of producing concrete, including mixing natural pozzolan and an activator including sodium silicate and brine sludge to form an alkali activated binder; and mixing a coarse aggregate and a fine aggregate with the activated alkali binder to form the concrete, where a density of the brine sludge is about 100 kg / m3, a ratio of the sodium silicate to the brine sludge is about 2.5 to 1 by mass, and an oxide composition of the brine sludge comprises 15-20 wt % CaO, 2-6 wt % MgO, 0.5-2 wt % SrO, 0.5-2 wt % Fe2O3, 0.5-1.5 wt % SiO2, 0-0.5 wt % SO3, 12-18 wt % Na2O, 7-10 wt % BaO, 2-5 wt % Al2O3, 0.25-1 wt % K2O, and 5-10 wt % Cl, and a loss on ignition of 35-45 wt %. An alkali activated binder, including: natural pozzolan; and an alkali activator including sodium silicate and brine sludge. A concrete, including: the alkali activated binder; coarse aggregate; and fine aggregate.