The Research Theory And Practice Of The Temperature Control And Prevention Measures Against Crack In Water Engineering Concrete

There are many reasons that cause the crack in large volume of concrete, but temperature is the main one of them, and how the crack is caused by the temperature is very complex, so the research of the prevention against crack in large volume concrete is usually begun with the temperature control ,then analyze and research into the temperature field and temperature stress in large volume concrete.The analyses of temperature stress of large volume concrete are almost mature, but in the aspect of temperature control and prevention measures against crack, further research, supplement and creation are needed, for example, mix with new type of mixture and good additional material, improve the percentage of concrete compounding, and improve the skill of concrete construction, etc. As long as we design and construct carefully, we can reach the goal of small crack and even no crack in concrete.The big dam is complex in its structure, and there're many holes in it, and it is large in size and structure and easily affected by temperature, so the task of concrete temperature control and prevention against crack in big dam is very hard. Combined with the concrete construction and the temperature control, this article mainly do the research in the following aspects: The character of concrete heat and force; The calculation method about the stable temperature of a dam and the design of the standard of the temperature control; The calculation method of concrete temperature; Concrete temperature control and prevention measures against crack, mainly from the aspects of material selection and application, structure form, ways of construction, administration measures, etc.