10 results about "Cementitious composite" patented technology

This invention discloses a method for fixing a seepage-proof transition section on an irregular rock slope in a mine landfill. A seepage-proof cementitious composite sprayed material is wet-sprayed onto the irregular rock slope (1-2), forming a seepage-proof cementitious composite sprayed material layer (2) on the surface of the seepage-proof transition section. A seepage-proof geomembrane (3) is laid from the regular rock slope (1-1), and then rubber pads (7) and thin steel plates (6) are laid on the geomembrane (3) from the inside out. Hollow grouting anchors (4) are self-drilled through the holes in the thin steel plates (6) and rubber pads (7), and the edges are trimmed with a seepage-proof sealing agent (8). This invention is applied to the reinforcement of seepage-proof transition sections on irregular rock slopes in mine landfills, overcoming the problem of easy damage during the fixing process of seepage-proof transition sections on irregular rock slopes, eliminating potential hazards, and improving the safety and reliability of the seepage-proof system. It not only has good economic benefits but also significant safety and environmental benefits.

Methods of additive manufacturing by spraying and automated spraying devices are provided. The device comprises a feed system and an automated spray head with at least one nozzle in communication with a first supply and a second supply to spray at least one stream comprising fibers and a sprayable cementitious material. A first nozzle may deliver the first sprayed stream comprising fibers, a second nozzle may deliver a second sprayed stream of first sprayable cementitious material, and a third nozzle may deliver a third sprayed stream of second sprayable cementitious material comprising carbon dioxide. The device forms a cementitious component on a target having a first region comprising a reinforced cementitious composite material. There is also a second distinct region comprising a carbonized cementitious material formed from the third sprayed stream comprising the second sprayable cementitious material comprising carbon dioxide.

This application provides a multi-level scale sisal cellulose fiber reinforced cement-based composite material and its preparation method. The composite material comprises cement, standard sand, and multi-level scale sisal cellulose fibers, wherein the amount of multi-level scale sisal cellulose fibers incorporated is 0.01%–0.3% of the cement mass, and the diameter of the multi-level scale sisal cellulose fibers is in the nanometer scale and the length is in the micrometer scale. This application optimizes existing cement-based material curing methods and significantly improves the mechanical strength and durability of cement-based materials.

The present invention refers to a Daytime Radiative Cooling Cementitious composite includingan OPC binder in the form of grains, with an amount of Fe2O3 lower than 0.05% by weight with respect to the total weight of the OPC binder, wherein the grain size is below 25 μm,water, wherein the weight ratio between water and the OPC binder is between 0.2 to 0.6,an addition in a proportion between 0.1% and 50% by weight with respect to the weight of the OPC binderand wherein the resulting DRCCC has a pore size below 6 μm as defined by mercury intrusion porosimetry, that can optionally comprise micropatterns, and to its use in the construction industry, such as building construction, in civil works such as reservoirs, bridges, dams and sewers, in solar cell technology or in urban architectural design.

The present application belongs to the technical field of engineering cement-based composite materials, and particularly relates to a self-healing cement-based composite material and a preparation method thereof. Raw material composition of the self-healing cement-based composite material comprises Portland cement, fly ash, slag powder, water reducing agent, fiber, SAP and capsule type additive. The capsule type additive comprises an inner core and a silica coating shell layer, and the inner core comprises a silane modified ethylene-acrylic ester-GMA terpolymer and a sodium carbonate activator. The self-healing cement-based composite material of the present application can effectively limit cracking through fiber reinforcement ductility, and further realizes good synergistic self-healing performance through SAP and the capsule type additive. The self-healing cement-based composite material has the advantages of low cost, stable performance and easy industrialization.

This invention provides an auxiliary component for fireproof and flame-retardant indoor soundproof walls based on inorganic cementitious composite materials, relating to the field of fireproof and flame-retardant board technology. It includes: a wear-resistant fire-retardant board and a sound-insulating fireproof board. The wear-resistant fire-retardant board is composed of the following components by weight: 40-60 parts ceramic fiber, 5-10 parts aluminate cement clinker, and 10-15 parts silica powder. The sound-insulating fireproof board is composed of the following components by weight: 25-30 parts ceramic fiber, 15-20 parts potassium feldspar powder, 5-10 parts aluminate cement clinker, 15-20 parts expanded perlite, and 5-10 parts porous diatomaceous earth. The core materials of the wear-resistant fire-retardant board and the sound-insulating fireproof board in this invention are inorganic substrates such as ceramic fiber and potassium feldspar, possessing a Class A long-lasting flame-retardant effect, and also exhibiting excellent characteristics such as wear resistance, high temperature resistance, aging resistance, and sound insulation. This solves the problem that most components do not use high-efficiency inorganic substrates, resulting in overall performance that does not meet ideal standards.

This invention relates to a method, apparatus, equipment, and storage medium for preparing cement-based composite materials. The method includes: retrieving a process parameter package from a database based on initial parameters; generating control signals for an ultrasonic device, a CO2 gas supply device, and a stirring device based on the process parameter package; sending the ultrasonic device control signal to the ultrasonic device, the CO2 gas supply device control signal to the CO2 gas supply device, and the stirring device control signal to the stirring device, so that the ultrasonic device, the CO2 gas supply device, and the stirring device operate on materials within the same reactor. This disclosure achieves carbon fixation during cement slurry mixing, rapidly improves the early strength of the cement-based material system, facilitates subsequent rapid demolding, curing, and practical application, reduces energy consumption, and is green and low-carbon.

This invention discloses a method for evaluating the interfacial reinforcement of ultra-high performance concrete using limestone powder as a substitute for silica fume, belonging to the technical field of cementitious composite material mix design and performance evaluation. The invention first establishes a reference cementitious material matrix system containing silica fume and sets up gradient substitution groups for silica fume using limestone powder. The strength of specimens with different substitution ratios is pre-screened based on the 28-day matrix compressive strength, selecting representative substitution groups. The 100-hour cumulative heat release, 28-day total porosity, peak pull-out load of a single steel fiber, and pull-out work of a single fiber are measured for the representative substitution groups. Hydration response coefficient, pore structure compactness coefficient, peak bearing capacity coefficient, and energy dissipation coefficient are constructed, and a coupled determination method of interfacial reinforcement index (IEI) and strength constraint coefficient (Kc) is established. Based on IEI and Kc, candidate reinforcement groups, optimal substitution groups, and corresponding substitution ratios are output. This invention can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious systems.

This invention provides a design method for reinforcing masonry structures with high-ductility cement-based composite materials based on toughness, comprising the following steps: assessing the seismic toughness level of the existing masonry structure to determine the seismic toughness improvement target; preliminarily determining the design parameters of the high-ductility cement-based composite material surface layer based on the seismic toughness improvement target; assessing the seismic toughness level of the reinforced masonry structure to confirm whether the seismic toughness improvement target is met, and obtaining the design parameters of the high-ductility cement-based composite material surface layer that meet the seismic toughness improvement target based on the confirmation result. The beneficial effects of this invention are: this invention organically combines the quantification of seismic toughness with the reinforcement design scheme, and uses a new high-performance material to establish a reinforcement design method for existing masonry structures to improve the seismic toughness level of existing masonry structures. Therefore, this invention not only considers the improvement of the seismic performance of existing masonry structures, but also the optimization of structural repair time and repair costs.

This invention relates to a shrinkage stress relief device for concrete towers and its construction method. The device includes a filler and circumferential reinforcement. The filler is provided at the circumferential joint of the tower sections. The filler is made of a high-ductility fiber-reinforced cementitious composite material. The filler is connected to the tower sections through internal circumferential reinforcement. The device is obtained by first casting the filler and binding the circumferential reinforcement, and then casting the tower sections after installing the device. Compared with the prior art, this invention can prevent unnecessary shrinkage damage to the concrete tower sections during the production process and prevent the tower sections from cracking due to shrinkage stress.