Hemp Concrete Hempcrete for Sustainable Building

Eco-friendly building finishing material with enhanced flame retardancy. The composition comprises cement, hemp stem extract, lime powder, a flame retardant, and a high-performance water-reducing agent. The hemp stem extract is combined with a liquid hemp seed extract and liquid hemp stem extract in a specific ratio, along with particles containing silica balloons. The hemp stem extract enhances the material's performance while the high-performance water-reducing agent improves workability. The hemp stem extract contains natural flame retardants, including phosphorus, which are incorporated into the cement matrix. The composition demonstrates enhanced flame retardancy while maintaining superior workability.

Source

A low-shrinkage, high-durability self-compacting concrete that combines natural plant-derived materials with conventional cement and aggregate to enhance its performance characteristics. The concrete utilizes a unique blend of plant-based materials, including urea, calcium source, and plant-derived aggregates, which are incorporated into a cement-based matrix. This composition provides improved durability, self-shrinkage, and water permeability while minimizing environmental impact through the use of plant-based materials. The resulting concrete exhibits enhanced resistance to cracking, spalling, and weathering, while maintaining its self-shrinkage properties.

Source

Earth-moist concrete composition comprising cement, sand, gravel, water, and elongated vegetable aggregate cut in the longitudinal direction, with the elongated vegetable aggregate exhibiting superior adhesion properties compared to cross-cut aggregates. The composition is processed into hardened concrete products, such as pavement slabs, concrete tires, and paving stones, which achieve improved durability and environmental benefits through the natural properties of the vegetable aggregate.

Source

Mineralizing hemp fibers to create sustainable building materials through a novel calcium carbonate-based surface modification process. The method involves sequential treatment of hemp fibers with calcium chloride and alkali metal carbonate solutions, followed by heat treatment to transform the calcium carbonate into calcium oxide and biochar. The resulting mineralized hemp fibers exhibit enhanced mechanical properties and can be used in cementitious and non-cementitious applications, including construction materials and green building products.

Source

A high-performance concrete with enhanced water absorption and retention properties, achieved through the use of a novel polycarboxylic acid water-reducing agent. The agent, comprising acrylic acid, methallyl polyoxyethylene ether, and methacrylic acid sulfone, exhibits superior dispersibility and retention characteristics when formulated with a specific ratio of these components. This agent enables the creation of a cement paste with enhanced water absorption and retention capabilities, particularly in high-humidity environments. The agent's unique molecular structure enables optimal interaction with cement particles, resulting in improved water absorption and retention performance compared to conventional water-reducing agents. The agent can be incorporated into concrete mixtures to address water absorption and retention challenges, while also providing enhanced durability and workability.

Source

Plant-based concrete and masonry blocks incorporating Kenaf core and fibers offer enhanced thermal and acoustic insulation properties compared to conventional materials. The blocks feature a core made from Kenaf fibers, which are processed to achieve specific particle sizes and distributions. The core material is coated with sodium silicate (water glass) to improve sealing and durability. The resulting blocks achieve improved thermal resistance (up to 0.11 W/m-K) and acoustic reduction (0.35 sound absorption coefficient) without compromising mechanical properties, making them suitable for construction applications.

Source

Construction material made from industrial hemp stalks, comprising a composite of hemp fibers and lime binder, which replaces traditional cement-based building materials. The composite is produced through a process that separates hemp fibers from the woody part of the stalk, crushes them into fine fractions, and then combines them with lime binder. The resulting material exhibits superior insulation properties and is suitable for applications requiring natural, sustainable building solutions.

Source

Hemp-based masonry units that incorporate hemp hurd with a lime-based binder, offering a reduced-carbon footprint alternative to traditional masonry materials. The hemp hurd is combined with hydraulic lime to create a biocomposite material that can be used to produce masonry units through a settable formulation process. The resulting material can be used for load-bearing or decorative applications, with the settable formulation comprising hemp hurd and water. This innovative approach enables the production of hemp-based masonry units while achieving significant carbon reductions compared to traditional masonry materials.

Source

Sprayable hemp-based composition for fire-resistant, high-strength, and insulating building materials. The composition comprises hemp fibers, mineral components, and water, with specific mineral compositions including calcium, magnesium, potassium, and phosphorus. The composition exhibits enhanced fire resistance, thermal insulation, and structural integrity when applied through a spray process, enabling construction and plumbing applications without traditional mold-based production methods.

Source

A novel, environmentally sustainable concrete masonry unit made from a combination of crop residues, geopolymers, and industrial waste. The unit achieves superior performance through the use of a 1:1:1.5 to 1:1.5:3 ratio of cooked crop residues, geopolymers, and pulverized fuel ash, respectively. The mixture is treated with sodium hydroxide to enhance homogeneity and activate the natural binding agents. The resulting composite material exhibits enhanced compressive strength, improved thermal insulation, and increased load-bearing capacity compared to conventional concrete masonry units.

Source

Hemp-based cement compositions for construction applications, particularly in sustainable building materials. The compositions contain hemp-derived binder components and aggregate materials, such as river sand, fly ash, or ground granulated blast furnace slag. The hemp-derived components are derived from hemp plant residues, providing a renewable and sustainable alternative to traditional cementitious binders. The compositions exhibit enhanced mechanical properties, reduced efflorescence, and improved carbon sequestration compared to conventional cement-based materials. The hemp-based binder components can be combined with a suitable alkali activator to produce a binder slurry, which is then mixed with aggregate materials to form the final concrete or mortar product.

Source

A hemp concrete U-shaped prefabricated part with enhanced durability and resistance to natural disasters. The part comprises hemp fibers, plant seeds, and a combination of cement, gypsum, fly ash, and mineral powder, with a specific particle size distribution. The hemp fibers have a controlled diameter range of 10-50 meshes, while the plant seeds maintain a moisture content between 5-8%. The combination of hemp fibers and plant seeds provides improved mechanical properties and resistance to environmental stressors, while the cement, gypsum, fly ash, and mineral powder enhance the structural integrity and durability of the concrete. The hemp concrete is prepared using a controlled curing process, resulting in a long-lasting, high-performance U-shaped prefabricated part suitable for construction applications.

Source

Ultra-high-strength concrete without sand or water, featuring a novel fiber reinforcement system that combines natural fibers with a specialized textile structure. The innovative reinforcement consists of cotton, wool, bamboo, flax, sisal, and old textile fibers, which are strategically integrated with perlite and whey-based fibers to enhance concrete properties. The textile structure, comprising a network of fibers and woven materials, provides exceptional durability and resistance to deformation, while the perlite and whey-based fibers contribute to the concrete's exceptional strength and thermal insulation. This unique combination enables ultra-high-strength concrete with improved workability and enhanced durability compared to conventional fiber-reinforced concrete systems.

Source

A novel concrete production method utilizing hemp and resin for sustainable building materials. The method combines 90% hemp with 10% resin, replacing traditional cement in concrete production. The hemp and resin blend provides improved insulation properties, fire resistance, and natural heat management while reducing waste generation compared to traditional concrete. The resulting material offers enhanced durability and performance characteristics, particularly in fire-resistant applications, while minimizing environmental impact.

Source

A method for producing concrete from waste hemp straw ash that can be used as a supplementary cementitious material (SCM) in concrete mixes. The process involves burning hemp straw to produce ash, which is then used as a cement replacement in the concrete production process. The ash is mixed with cement, water, and aggregate in two stages, resulting in a concrete with improved workability and durability compared to conventional cement-based concrete. The ash can be used in place of cement in concrete mixes, particularly in applications where cement is limited or expensive.

Source

A novel method for producing concrete with enhanced mechanical properties through the use of vegetal aggregate. The process involves immobilizing vegetal fibers in a concrete matrix through a pre-mineralization step, followed by crushing the composite into aggregate. The aggregate is then compacted into concrete without requiring the removal of the mold, resulting in reduced expansion during curing and improved mechanical durability compared to conventional concrete production methods. The vegetal fibers effectively distribute compressive forces across the aggregate structure, enabling the production of high-performance concrete with improved tensile strength and compressive resistance.

Source

Admixture for flowable concrete production that combines waste materials with cement to create a durable, workable concrete. The admixture comprises Portland cement, unprocessed rice hulls, limestone powder, concrete bonding agent, slag, colloidal silica, water-reducing plasticizer, and twisted nylon fibers. The rice hulls are first treated with an adhesive agent, then mixed with calcium carbonate, cement, and water to form a workable concrete. The resulting material can be poured and cured to form a durable concrete structure.

Source

Composite materials containing hemp and nanocellulose achieve enhanced mechanical properties through the incorporation of nanocellulose into hemp-based composites. The nanocellulose is produced through mechanical processing of biomass, followed by surface modification to achieve hydrophobic properties. This hydrophobic nanocellulose enhances the mechanical performance of hemp-based composites while maintaining their natural durability and sustainability. The resulting composites exhibit improved compressive strength compared to conventional hempcrete, making them suitable for a wide range of applications beyond traditional building materials.

Source

Building material comprising a natural binder and a water-retaining agent, prepared from vegetable aggregate. The material comprises a binder comprising 45-70% natural lime and 30-50% metakaolin binder, associated with hemp hemp aggregates present at 15-30% dry mass of binder, with a water/binder ratio of between 0.5 and 1.5.

Source

A bio-composite material made from renewable, bio-sourced ingredients that provides improved mechanical, fire resistance, and thermal efficiency compared to existing biocomposites. The material is made by combining plant fibers, agricultural by-products, and recycled plant fibers with a polysaccharide binder like alginate. The bio-composite has a density between 300-210 kg/m3, mechanical strength, and fire resistance that allows it to be used in building and transportation applications. The bio-composite's high density, low thermal conductivity, and lack of flame propagation make it a hybrid material that balances structural performance, fire safety, and thermal efficiency.

Source