Research Of The Concrete Corrosion Mechanism And Treatment In Ningxia Area

According to actual condition of concrete corrosion in Ningxia area, concrete corrosion mechanism is studied, the mix proportions of the anticorrosion concrete are proposed, and anticorrosion parameter experiments of concrete are done. Through the experiment, the corrosion resistance of concrete is associated with its hydration of cement, the components and quantities of hydration products, its micro-structure and its lying environment, The cement exposed to water hydrates immediately in the cementitious materials of concrete, and produces Ca(OH)₂ and C₃AH with the prolonging of hydration time, which is the important cause to reduction of corrosion resistance of concrete. In order to solve the concrete corrosion destructive problem of Ningxia area, concrete is mixed with high-quality fly ash and high-range water reducer, and its mix proportions are designed rationally. The corrosion resistance of "bi-adding" concrete is greatly improved. Since the project needs are met, also local industry waste is used reasonably, and the project construction cost was economized.Performance of "bi-adding" concrete with I level of fly ash and high-range water reducer is studied. Through the laboratory experiment method, making use of fly ash and water reducer "bi-adding" technology, the laboratory concrete mix proportion design is carried on, six kinds of mix proportion concrete containing the datum concrete and five kinds of fly ash mix quantity "bi-adding" concrete is designed, and each kind "bi-adding" concrete direct economic efficiency which brought regarding the datum concrete is analyzed simply, the designed each kind of mix proportion concrete operating performance and not-same-age compressive strength is tested. According to the concentration of solution in the actual corrosion environment, the sulfate corrosion solution is blent, the concrete corrosion tests are carried on. According to the superficial corrosion status and the compressive strength changing situation of the concrete samples under different corrosion condition, anti-sulfate corrosion ability of each kind of mix proportion concrete is inspected. According to the operating performance, the not-same-age compressive strength and the corrosion resistance ability to the different...