172 results about "Pozzolan" patented technology

The purpose of this invention is to provide a method for preparing cemented backfill materials based on response surface methodology using composite activating coal gasification slag. This method belongs to the field of mining engineering technology. Based on sorting and removing impurities from the coal gasification slag and drying it, the invention obtains ultrafine powder of the coal gasification slag for preparing the backfill material through ball milling. Then, coal gangue is crushed and screened using a crusher to obtain coarse, medium, and fine aggregates for the backfill material. Finally, cement, ultrafine coal gasification slag powder, coal gangue aggregate, activator, and water are mixed evenly to prepare the cemented backfill material. This invention not only solves the problem of low activity of coal gasification slag volcanic ash but also effectively controls the shortage of cemented backfill materials and high backfilling costs during cemented backfill mining, ensuring sustainable development. Furthermore, it effectively utilizes the widely accumulated coal gasification slag, reducing pollution and large-scale land occupation of the surrounding environment.

The invention belongs to the technical field of mine goaf filling materials, and particularly discloses flow-state solidified loess for coal mine filling and a preparation method and application of the flow-state solidified loess. According to the method, rich loess resources in the loess plateau area are used for preparing the flow-state solidified loess for coal mine filling, the coal mine recovery rate can be increased, the filling material cost is reduced, the problem that stones in the loess plateau area are insufficient is solved, the toughness and dry shrinkage resistance of the solidified flow-state solidified loess can be improved, and the problem that the loess is soft and swelled when meeting water is effectively solved. The curing agent for the fluid-state cured loess is developed according to the characteristics of loess of loess plateau and the characteristics of early strength, fluidity, pumpability, crack resistance and the like required by filling of the fluid-state cured loess, the alkali excitation mechanism, the pozzolanic effect, the secondary hydration reaction and other mechanisms are utilized, and proper functional components such as early strength, water retention and crack resistance are compounded, so that the curing agent for the fluid-state cured loess is prepared. The curing agent can effectively solve the common problems of air shrinkage, easy cracking, low strength and the like when a commercially available curing agent is used for preparing flow-state cured loess.

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 relates to the technical field of grouting materials, in particular to a dynamic water environment anti-dispersion micro-expansion grouting material and a preparation method thereof. A component A of the grouting material mainly comprises the following raw materials in parts by weight: 120-160 parts of a gel material with volcanic ash characteristics, 3-5 parts of a retarder, 10-15 parts of magnesium oxide, 0.5-2 parts of citric acid, 5-8 parts of aluminum sulfate, 1-2 parts of sodium fluoride, 0.5-1 part of gelatin and 70-100 parts of water; the component B mainly comprises the following raw materials in parts by weight: 4-8 parts of polyacrylamide, 5-10 parts of polyacrylic acid derivative salt, 1-2 parts of alcohol polysaccharide, 40-100 parts of water glass and 30-50 parts of water; magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance; the problems that a traditional cement grouting material is poor in anti-scouring capacity and anti-dispersing capacity, low in retention rate, poor in stone durability and the like can be solved.

Hydraulic binder composition comprising: a mixture of (i) between 20 and 95 dry wt % of at least one steel making slag, (ii) between 4 and 79 dry wt % of at least a slag different from (i) and / or at least one pozzolanic material and / or at least one inert filler, and (iii) between 1 and 25 dry wt % of at least one co-binder; between 0.01 and 10 dry wt %, relative to the mixture total dry weight, of at least one steel making slag accelerator, between 0.1 and 5 dry wt %, relative to the mixture total dry weight, of at least one alkali activator for reacting (i), (ii), and / or (iii) with water, the alkali activator different from the slag accelerator and chosen among alkali mineral salts and mixtures thereof; and between 0.1 and 2 dry wt %, relative to the mixture total dry weight, of at least one fluidification agent.

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 invention discloses a fly ash-based admixture and a preparation method thereof, and belongs to the technical field of building materials. The fly ash is used as a main body and cooperates with the slag, the steel slag and the volcanic rock powder, so that the utilization rate of industrial solid wastes is remarkably increased, the cement consumption is reduced, the hydration heat of the concrete is reduced, temperature cracks of mass concrete can be effectively inhibited, and meanwhile, the introduction of the volcanic rock powder further supplements active silicon-aluminum components, enhances the volcanic ash effect and improves the later strength; by introducing gypsum, the setting time can be adjusted, a sulfate excitation environment is provided, an early hydration reaction of a fly ash system is promoted, the problem that a traditional admixture is low in early strength is solved, concrete pores are filled through the micro-aggregate effect of the fly ash-based admixture, the structure is denser, and anti-permeability and mechanical properties are improved.

The invention relates to the technical field of building engineering materials, in particular to an inorganic grouting material with adjustable curing time and a use method thereof. The inorganic grouting material provided by the invention comprises a main material and an adjusting material, the main material comprises the following components in parts by mass: 50-70 parts of sulphoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano volcanic ash, 0.5-1 part of a water reducing agent and 0.1-1.5 parts of a retarder; the adjusting material comprises a composite coagulant and hydroxypropyl methyl cellulose. Through innovation of a material formula and innovation of a construction process, the problem that the grouting effect is poor due to the fact that a traditional grouting material cannot change the solidification time according to variable underground grouting scenes and requirements is solved; accurate grouting can be achieved under the conditions of different grouting depths, different crushing degrees, different diffusion radiuses, different mixing water temperatures, different coal and rock mass temperatures, different water inflow and the like.

Disclosed herein is a biomineral supplemental blend for the replacement of hydraulic cement to create sustainable controlled low strength material (CLSM) with composition comprising a biomineralized algae, a silica source, pozzolan, biochar and / or bio-fly ash; and an aggregate; where the aggregate comprises a secondary binder, sand and / or rock, hydraulic cement, and filler material(s). Also disclosed herein is a method of manufacturing a transportable dry biomineral supplemental blend CLSM dry paste composition comprising blending together a microorganism package, a biomineralized algae, biochar and / or bio-fly ash, and pozzolan; mixing the biomineral supplemental blend, with hydraulic cement, cementitious materials, and liquid media to form a sustainable CLSM paste; and mixing the sustainable CLSM paste with an aggregate to form a sustainable CLSM mix design.

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 relates to the field of building materials, and particularly discloses green low-carbon concrete and a preparation method thereof, and the green low-carbon concrete comprises the following raw materials: cement, modified recycled aggregate, a composite admixture, a water reducing agent, a strength-promoting shrinkage-reducing agent, reinforced fibers and water; wherein the composite admixture is a mixture of fly ash and steel slag powder and / or volcanic ash; the modified recycled aggregate is prepared by sequentially crushing, cleaning, modifying and grading building waste; the preparation method comprises the following steps: dry-mixing the cement and the composite admixture, and then mixing with the modified recycled aggregate and the reinforced fiber to prepare a dry mixture; mixing the strength-promoting shrinkage-reducing agent, the water reducing agent and water to obtain a mixture, mixing the mixture with the dry mixture, and stirring to obtain the green low-carbon concrete. The method has the characteristics that the cement consumption is reduced, the industrial solid waste utilization rate is increased, and meanwhile, the concrete strength and the impermeability are improved.

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.

Disclosed herein is a biomineral supplemental blend for the replacement of hydraulic cement to create sustainable cement and concrete with composition comprising a biomincralizcd algae, a silica source, pozzolan, biochar and / or bio- fly ash; and an aggregate; where the aggregate comprises a primary binder, a secondary binder, sand and / or rock, hydraulic cement, filler material(s), and admixtures. Also disclosed herein is a method of manufacturing a transportable dry biomineral supplemental blend composition comprising blending together a microorganism package, a biomineralized algae, biochar and / or bio-fly ash, and pozzolan; mixing the biomincral supplemental blend with hydraulic cement, cementitious materials, and liquid media to form a sustainable cement; and mixing the sustainable cement with an aggregate to form a sustainable concrete.

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.

This invention provides a highly protective cement safe resistant to drilling impact, comprising an outer shell, an inner liner within the outer shell, a filling cavity formed between the outer shell and the inner liner, a concrete protective layer within the filling cavity, and a sealing cap on the top of the outer shell. The concrete protective layer, used in the safe, comprises the following components: 4200-4800 parts of hydraulic cementitious material, 1600-2200 parts of pozzolanic mineral admixture, 450-650 parts of active mineral admixture, 450-650 parts of fine inert filler, 4200-5200 parts of graded high-hardness fine aggregate, 850-900 parts of water, 70-85 parts of high-efficiency water-reducing agent, 12-20 parts of defoamer, and 1100-1300 parts of end-hooked steel fiber. The components of this invention work synergistically to effectively improve the bonding performance between concrete and the steel plate matrix, inhibit shrinkage and cracking during curing, and enhance product lifespan and structural stability.

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.

The invention relates to the technical field of building materials, and discloses a burning-free steam-curing-free all-solid waste type iron tailing artificial fine aggregate and a preparation method thereof.The preparation method comprises the following steps that iron tailings are dried and screened, and iron tailing powder with the particle size smaller than 0.3 mm is obtained; mixing the pozzolanic material, the exciting agent, the expanding agent and the reinforcing agent, and uniformly stirring to obtain an all-solid waste cementing material; the iron tailing powder and part of the all-solid waste cementing material are mixed, ground and stirred evenly, and a mixture is obtained; carrying out rolling and watering treatment on the mixture to obtain iron tailing microspheres with the diameter of 1-4mm; adding the residual all-solid waste cementing material into the iron tailing microspheres for rolling treatment, so that the surfaces of the iron tailing microspheres are wrapped with the all-solid waste cementing material, and composite particles with core-shell structures are obtained; the composite particles of the core-shell structure are subjected to curing treatment, and the iron tailing artificial fine aggregate is obtained. Energy consumption, carbon emission and production cost can be reduced, high-value utilization of multi-element solid waste is realized, and shortage of natural gravel aggregate is relieved.

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.

To provide a polymer cement mortar composition that exhibits excellent spraying performance with a low rebound amount and low dust generation during spraying, and also excellent troweling finish performance.SOLUTION: A polymer cement mortar composition is provided, comprising cement, a pozzolanic material, a polymer for cement, and fine aggregate, where the particle size of the fine aggregate is such that the mass ratio of aggregate particles with a particle size of less than 0.6 mm is 2 to 45 mass%, the mass ratio of aggregate particles with a particle size of 0.6 mm or more and less than 1.2 mm is 35 to 90 mass%, and the mass ratio of aggregate particles with a particle size of 1.2 mm or more and less than 2.5 mm is 2 to 55 mass%, all with respect to the total mass of the fine aggregate.SELECTED DRAWING: None

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 discloses a method for preparing a high-performance grouting material by exciting coal gangue through water glass, which comprises the following steps of: putting the coal gangue into a rod mill for crushing and screening to obtain undersize coal gangue and oversize coal gangue; washing the oversize coal gangue with water to obtain a precipitate, and drying the precipitate; mixing the precipitate with the undersize coal gangue; preheating the mixed coal gangue, and calcining to obtain a calcined product; weighing a calcined product and water glass according to a ratio, and grinding into fine powder through a tube together to serve as an admixture; weighing the admixture, the cement, the water reducing agent and the water in proportion, and uniformly stirring and mixing to obtain a cementing material; the preparation method comprises the following steps: weighing the cementing material and the gravel in proportion, and uniformly stirring and mixing. The coal gangue is subjected to ball-milling separation and screening for a certain period of time, so that the coal gangue is separated due to different hardness, the fragile coal gangue is calcined to induce and excite the volcanic ash activity, the fragile coal gangue is used as an admixture to prepare a cement mortar material with a certain amount of water glass, and the high-performance grouting material is obtained.

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.

This invention discloses a fly ash-based admixture and its preparation method, belonging to the field of building materials technology. This invention uses fly ash as the main component, in conjunction with slag, steel slag, and volcanic rock powder, significantly improving the utilization rate of industrial solid waste and reducing cement usage, lowering the heat of hydration in concrete, and effectively suppressing temperature cracks in large-volume concrete. Simultaneously, the introduction of volcanic rock powder further supplements the active silica-alumina components, enhancing the pozzolanic effect and improving later-stage strength. The introduction of gypsum can regulate setting time and provide a sulfate-activating environment, promoting the early hydration reaction of the fly ash system and solving the problem of low early-stage strength in traditional admixtures. The "micro-aggregate effect" of the fly ash-based admixture of this invention fills the pores of concrete, making the structure denser and improving impermeability and mechanical properties.

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.