Connected two-in-one patch for strainless hernia repair

Low-heat silicate cement and its preparing process and application

A silciate cement with low hydrous heat for high-performance concrete engineering is prepared from portland cement clinker (more than 90%), glypsum (less than 10%) and C2S (at least 40%). Its preparing process features simple coarse grinding and enhanced fine grinding. Its advantages include low hydrous heat and water requirement, and high flowability strength and durability.

一种低热硅酸盐水泥及其制备和应用

... 本发明涉及的是一种可用于重点工程高性能混凝土、大体积混凝土、水工混凝土的高性能水泥一低热硅酸盐水泥及其制备和应用，其配比为高贝利特水泥熟料≥90％，石膏≤10％，熟料C#-[2]S含量不低于40％，水泥的凝结时间通常控制在初凝≥45min，终凝≤10h。生产时减少现有水泥磨粗磨仓内的大球数10～30％，增加细磨仓内的钢段数10～30％。用本发明所述水泥替代通用硅酸盐水泥或中热硅酸盐水泥配制混凝土具有低水化热、低需水量、高流动性、高强度及高耐久性等特点。 ...

Gaobeilite cement clinker and prepn. process thereof

Computation model of entrance channel passing capability and forecast emulation method thereof

The invention relates to a calculation model of the loading capacity of an approach channel and a forecasting simulation method, comprising the flowing steps: first, a mathematical model for the landing habit of a ship is established; second, a mathematical model for the loading capacity of a confined channel is established; and third, a system simulation model is established. The method researches the theoretical model for the loading capacity (saturation) of the confined channel for the first time, the application of the model not only can provide powerful technology support and scientific data for the planning and design of a main channel of a port, but also has a very important and practical significance in ensuring the safety of port operation, improving the comprehensive utilization of the port resource, guaranteeing an excellent navigation environment and a good navigation order on the port waters, promoting the sustainable development of the port. The application of the method has ...

Auto-waterproof bridging particle

The invention provides an auto-waterproof bridging particle which belongs to the field of engineering materials. The particle is formed by mixing 20 to 85 weight parts of sulphoaluminate cement, 5 to 26 weight parts of aluminoferrite cement, 5 to 20 weight parts of alumina material, 3 to 10 weight parts of gypsum, 2 to 10 weight parts of microdilatancy component, 0 to 5.0 weight parts of setting time regulating agent, 0 to 5.0 weight parts of hardening accelerator, 0 to 1.0 weight parts of plasticizing agent and 0 to 3.0 weight parts of binding material. The bridging particle of the invention is characterized by rapid bridging, swelling in water, permeating crystallization, auto-healing for fine crack and permanent waterproof property and can efficiently solve the problem of bridging the concrete structure which is leaked.

Quick leakage-stopping agent

Method for producing ferrovanadium nitride by adopting self-propagating high temperature synthesis process

The invention relates to a method for producing ferrovanadium nitride by adopting a self-propagating high temperature synthesis process, which comprises the following steps of: firstly, crushing ferrovanadium in grinding equipment; drying and then charging the crushed ferrovanadium into a crucible in bulk; placing the crucible into a high-pressure synthesizer and filling 6-12MPa of nitrogen; starting an igniting device and igniting the raw materials to carry out synthetic reaction; automatically sustaining combustion synthesis reaction; and cooling and taking out the combusted and synthesized ferrovanadium nitride in the nitrogen and crushing into blocks, wherein the ferrovanadium and the nitrogen are used as raw materials. The method for synthesizing and producing the ferrovanadium nitride does not need additional energy sources, has no pollution, high synthesis speed, energy saving, environmental protection and high efficiency and is a hi-tech production process which is worthy of popularization ...

Novel high sulfur-resistant cement

Efficient bulking agent of calcium aluminate and its preparing process

An efficient bulking agent of calcium aluminate for concrete (mortar) is prepared from high-Al cement clinker (10-30 %), anhydrite (40-70%), calcined kaolin (10-30%) and high-Al slag (5-20%) through grinding to 300-400 sq.m/kg. It can be proportionally added to concrete or mortar to obtain shrinkage-compensated concrete or the concrete members with high self-stress (2-3 MPa).

Quick leakage-stopping agent

A quick leakage-stopping agent is prepared from high-Al cement clinker (70-80%), lime (0.2-1.0%), lithium carbonate (0.01-0.05%), alunite (5-15%) and gypsum (10-20%) through mixing and grinding untilits specific surface area is greater than 400 sq.m/kg. Its advantages are quick solidification, high strength, no contraction, and high water-stopping nature.

Wireless traffic signal system and method thereof cooperated with vehicle tracks at intersections

The invention relates to the technical field of traffic control, in particular to a wireless traffic signal system and a method thereof cooperated with vehicle tracks at intersections. The invention adopts a special short-range communication mechanism. The system comprises intersection transmitting equipment, vehicle receiving equipment, a singlechip, voice output equipment, GPS (Global Position System) equipment and a vehicle display. The singlechip carries out data fusion processing on real-time traffic information and the longitude and the latitude of vehicles to obtain information of traffic signal lamps on the vehicle tracks and outputs the information to the vehicle display. The method comprises the step that the singlechip carries out data fusion on information of an electronic map, a real-time traffic lamp signal, vehicle track positioning and traveling direction and displays the traffic signal on the electronic map when the vehicles enter the communication range of a special short-range ...

Calcium aluminate bulking agent and producing process thereof

WATER-PROOFING POWDER MADE OF POWDERED COAL ASH AND PRODUCING METHOD THEREOF

Heated powdered coal ash is ground for several min. in grinding machine to which water-proofing agent whose main component is fatty acid is added for direct penetration and surficial treatment to make up water-proofing powder after hot-air drying. Said water-proofing powder features high water resistance and resisting ageing, acid and alkali and may be used individually or in conjuction with cementing material.

Multifunctional rolling spoon needle therapy

Multifunctional rolling spoon needle therapy

The multifunctional rolling spoon needle therapy of the present invention consists of monoway spoon needle, handle, scraper, spoon needle holder, rolling spoon needles and roller. The monway spoon needle and the scraper are fixed onto the handle or spoon needle holder, the spoon needle holder connects the handle and the roller, and the roller connected to the spoon needle holder has several rolling spoon needles fixed on it.

High-performance cement for construction in sea and preparation thereof

The invention discloses a high performance marine cement as well as a manufacturing method thereof, comprises the following compositions: clinker: 10 to 50 wt.%, slag: 20 to 60 wt.%, fly ash: 0 to 40 wt.%, sal micro-powder: 5 to 30 wt.%, and the sum of percentages is 100 percent. The product of the invention has advantages of seawater corrosion resistance, simplified construction process, convenient use, good construction performance and easy quality control, as well as reducing the construction time by over one third, expediting the construction progress, and reducing construction costs.