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Study on breaking concrete cement by high pressure water jet

Time: December 18, 2019 11:28 source: unknown author: admin

With the promulgation of various national environmental protection policies and the tightening of environmental protection policies, various environmental protection problems in China and regions have entered the remediation stage. However, the core of national environmental management policies is to take preventive measures and strengthen management to reduce environmental pollution and damage. Therefore, in the aspect of environment and economy, many preferential policies of capital investment and tax are put forward. For example, enterprises can include the funds needed for pollution prevention and control into the fixed assets investment plan and the national ecological protection projects. The state provides financial support and preferential policies on income tax exemption.
The purpose of implementing environmental policy is to urge industrial enterprises to adopt advanced technology and clean production process in technological transformation, and eliminate backward technology and equipment that waste energy and resources and seriously pollute the environment.
   High pressure jet cleaning broken cement As a high-tech clean technology of green environmental protection, technology is a new technology of cleaning, cutting and derusting developed in recent 30 years. It is more and more widely used in coal, petroleum, chemical industry, machinery, construction, transportation, scientific research and other departments. It is a technology promoted and promoted by the state under the background of "environmental protection".
At present, high-pressure water jet technology has been successfully applied in cleaning, derusting, construction, cutting and other industries, but the understanding of cutting and breaking rock and building concrete is not deep enough. The reason is that the complexity of water jet itself and the changing structure of crushing agent.
Zhengzhou Guangyuan cleaning equipment focuses on the research of surface cutting and crushing treatment of cement concrete engineering. According to the requirements of the project, different equipment and construction technology are used, and the selected technical parameters and configuration are also different. There are five main types of concrete cement crushing.

1、 Broken bridge deck
The main purpose of bridge deck cement crushing is to solve the problem of interlayer bonding. The floating slurry of cement concrete bridge deck is the main factor to induce the failure of waterproof layer, the failure of interlayer combination and the damage of bridge deck pavement. Therefore, if the floating slurry of the bridge deck is not completely chiseled out, the floating slurry under the action of traffic load vibration will produce interlayer peeling failure due to insufficient shear capacity, and will crack under the erosion of water, resulting in the damage of the upper asphalt concrete layer. When the bridge deck is broken, not only the laitance should be removed, but also the concave convex and pitted surface should be formed. That is to say, the difference between the wave crest and wave trough of the surface after chiseling should be larger, and only in this way can the bonding between layers be firm.
2 Semi rigid pavement base broken
The cement crushing depth and operation requirements of semi-rigid pavement base course of expressway are different from those of bridge deck before asphalt concrete pavement is laid. The purpose of these two surface treatments is to make the asphalt concrete pavement and base surface bond firmly, and to prevent water seepage, skid resistance and effectively improve the ability of anti vibration deformation.
3 Cement pavement and airport runway fragmentation
The requirement of cement crushing on cement pavement and airport runway is to prevent vehicles from skidding and aircraft landing. The former is to chisel the polished old cement concrete pavement into rough surface, and the latter is to remove tire marks on the airport runway. The purpose of the two is to improve the ride and landing characteristics of the aircraft and to improve the safety of the landing and take-off;
4 Broken steel box deck
The steel box deck needs to be broken and derusted before the waterproof layer is laid. The purpose of crushing and derusting is to improve the stability and shear resistance between layers, and prevent water infiltration from corroding the strength of steel structure.
5 Surface treatment before pavement seal coat
Before preventive maintenance of asphalt pavement, that is, in front of fog seal coat, emulsified asphalt seal coat, modified asphalt seal coat and macadam seal coat, the surface of original asphalt pavement must be thoroughly cleaned to increase the surface roughness and improve the bonding degree between seal coat cover and original base course.
The purpose of breaking is to form a whole between the new and old cement concrete, whether it is the joint of bridge components, piers, pouring hinge joints and Maole joints before deck pavement, or the construction or reinforcement of cement concrete projects such as cement concrete dam, nuclear power plant, airport, port wharf, pavement, tunnel, hydropower station pier, etc. Therefore, the surface after chiseling should not only remove laitance, but also form concave convex and pitted surface instead of a flat rough surface. Only in this way can the new and old concrete be bonded as a whole.
    In addition, it is not affected by the traditional structure of the ball crusher, but it is not only affected by the new structure of the ball crusher, but also by the use of the new structure The bond between concrete is poor.
Zhengzhou Guangyuan cleaning equipment through the research on the crushing test results of concrete cement with different pressure, flow rate equipment and different nozzles, it is found that the law of high-pressure water jet breaking concrete is different, the nozzle speed core length of different structure shape and the distribution of jet central pressure and central power are different, but the change law of jet is consistent. In the initial stage of high-pressure water jet, the velocity of water jet is constant, and the central pressure is also constant. Because the central velocity changes with the distance, the central pressure also changes with the distance. Therefore, it is of different types The reference parameters of concrete cement crushing and crushing structure are provided
 
Therefore, using high-pressure water to crush cement has the advantages of high speed, high efficiency and good crushing effect. It does not produce vibration to the aggregate of concrete, and can adapt to various projects, so as to ensure the construction quality of the project.