Catheter Perfusion Non-dispersible Underwater Concrete Research

Simulation method of pouring underwater concrete is used in this paper, which using polyacrylamide as dispersant, through the underwater dispersion resistance under different mixing proportion of concrete resistance to dispersion, fluidity and surface strength ratio, slump, collapse degree of expansion and mortar properties, such as aggregate turnover of experimental research. It analyzed dispersant, fly ash, water resistance, the underwater dispersion affecting the performance of concrete, and compared the optimal mixing proportion is obtained.This article introduces the beginning of the underwater dispersion resistance of the concrete research work, a simple generalization on dispersion of underwater concrete of the main performance and characteristics.Then using the orthogonal experiment method to study the concrete dispersant water-binder ratio, fly ash on the dispersion of underwater concrete of dispersion, fluidity, cube compressive strength what effect.By utilizing the method of "three factors and three levels" find all sorts of different material indicators in the influence of different level of underwater dispersion of concrete strength.There are a lot of casting method in underwater concrete casting. Among them the most widely used in construction is underwater catheter method that has the very important influence to improve the quality of the construction.Catheter method to effectively block the mixing material of concrete during casting and water contact, to ensure the concrete mixing materials can smoothly enter the underwater construction buildings,.And then catheter method of continuous casting process improves the resistance to disperse underwater concrete casting quality.For the underwater concrete, the influence of water-binder ratio is an important factor, particularly in terms of the fluidity and compressive strength of concrete.n this experiment, through comparison, finally determine the water-binder ratio of0.46reach maximum intensity of concrete block.At this time of the underwater non-dispersion concrete workability are good liquidity, can meet the requirements of national standard.Liquidity of the underwater non-dispersion concrete workability are good, can meet the national standard to the increase of water cement ratio, improve the liquidity of the concrete, improve its strength.But when water-binder ratio greater than0.46, the excessive liquidity affects the concrete of concrete mixing material quality of casting concrete block compressive strength rise but not fall.So in concrete under the premise of liquidity and block strength, take the best water-binder ratio is0.46.Fly ash can improve the liquidity of underwater dispersion concrete, the slump meet the specification requirements of the state, can significantly improve the workability of concrete.Fly ash can improve underwater dispersion late concrete strength and durability, to improve the performance of underwater concrete.By replacing part of cement to reduce the engineering cost, brings engineering economic benefit.