30results about How to "Overcome shrinkage" patented technology

The invention discloses an organic fiber toughened inorganic composite artificial stone panel and a preparation method thereof. The panel comprises a surface layer, an intermediate organic fiber toughened layer, and a base toughened layer, wherein the surface layer comprises the following raw material components in parts by weight: 40-70 parts of quartz sand, 10-30 parts of a quartz powder, 20-45parts of an inorganic active powder, 0.5-4 parts of a pigment, 0.3-1 part of a water reducing agent, and 3-10 parts of water; the intermediate organic fiber toughened layer comprises the following rawmaterial components in parts by weight: 40-60 parts of the inorganic active powder, 45-65 parts of sand, 0.8-1.5 parts of the water reducing agent, 6-14 parts of water, and 4-8 parts of organic fibers; and the base toughened layer comprises the following raw material components in parts by weight: 30-50 parts of the inorganic active powder, 30-55 parts of the quartz sand, 15-20 parts of the quartz powder, 0.5-1.2 parts of the water reducing agent, 4-8 parts of water, 0.8-2.5 parts of a toughening agent. The panel has good volume stability, low shrinkage, no warping and deformation during use,extremely low water absorption, good durability, no problems such as aging, good adhesion between layers, and good ductility and no instant brittle fracture, can be used as a bearing structure, has good surface dirt resistance, and is suitable for popularization and use.

The invention relates to a semi-rigid base reinforcement grouting slurry and a grouting method thereof. The raw materials according to mass percentage are: cement 95-99.7, water reducing agent 0.06-1.0, retarder 0.1-0.3, accelerator 0.03-0.07, plastic Expansion agent 0.02~0.04, mineral filler 0~4.79, obtained by stirring. The grouting method is: firstly locate the hole position 0.25 meters around the grouting crack, the hole distance is 0.75-1.0 meters, and drill down from the hole to the top of the roadbed; first add water in the mixer and then add the slurry, the quality of the water and the grouting slurry Ratio ≤ 0.35, stirring speed ≥ 500r / min, stirring time ≤ 5min; lower grouting pipe, grouting pressure 0.5-1.0MPa, the time from slurry stirring to grouting is ≤ 30min; sealant or asphalt is used after grouting. Plug the grouting hole. The invention has the characteristics of low cost of grouting, good fluidity, fast setting and high strength, simple construction of grouting method and the like.

The invention provides a resin-permeable ceramic composite which is formed by curing a ceramic body and mixed resin permeating in the porous network structure of the ceramic body, wherein the ceramic body has a porous network structure and comprises yttria-stabilized tetragonal phase zirconia; and the mixed resin comprises a mixture of methacrylate compounds and a thermal curing agent. The resin-permeable ceramic composite provided by the invention is composed of a porous ceramic network structure and resin permeating in the ceramic network structure; by adopting the ceramic as a matrix, the volume change of the composite in the curing process can be effectively avoided, and the defects that traditional particle reinforcing resin-based composite is easily cured and shrunk and consequently residual stress is introduced are overcome; and through the permeation way, the mixed resin can form a resin network structure penetrating through the ceramic network structure, and a ceramic-based composite with excellent mechanical properties is obtained.

The invention discloses a heart chamber simulator driving mechanism, which comprises a motor, a speed reducer, a crank shaft connecting rod mechanism, a linear guide rail and a piston air cylinder, wherein an output end of the motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is connected with one end of the linear guide rail through the crank shaft connecting rod mechanism, the other end of the linear guide rail is connected with the piston air cylinder through a shaft coupler, an air hole is formed in the side wall of the piston air cylinder, and the air hole is connected with a heart chamber simulator through a pipeline. The driving mechanism belongs to a driving mechanism capable of providing a pulsation type power source for the heart chamber simulator according to the set frequency and discharge capacity. The driving mechanism has the advantages that the pulsation feature of the beating of the heart chamber simulator can be realized, meanwhile, the beating frequency and the discharge capacity can be respectively regulated, and the human body heart beating process is more really simulated.

The invention discloses a heart chamber simulator driven by a hydraulic or air-pressure artificial muscle. The heart chamber simulator can really reflect cardiac systolic and diastolic beating process pressure and chamber deformation. The simulator comprises an outer sheath layer, a myocardium layer, cardiac valves and a closed hollow cavity formed between the outer sheath layer and the myocardium layer. The wall surface of the outer sheath layer is provided with a through hole used for input or output of liquid (gas) in the hollow cavity. Contraction and relaxation of a heart model can be achieved by changing the pressure in the hollow cavity. The heart chamber simulator can overcome the defect that a contraction and relaxation pressure error is caused by a pump which is used in an external circulation pipeline and solve the problem that a difference between the heart chamber deformation caused by external mechanical loading and the actual myocardial contraction and relaxation process deformation is large, and really reflects the heart chamber beating process deformation and correct circulating pressure relationships.