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The Analysis and Application of Temperature Crack in Mass Concrete Structure

Author: LiKeJiang
Tutor: DingHongYan；YaoXiaoDong
School: Tianjin University
Course: Architecture and Civil Engineering
Keywords: Heat of hydration Temperature cracks Temperature difference Mass concrete
CLC: TU755
Type: Master's thesis
Year: 2010
Downloads: 292
Quote: 0
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Abstract


Cement setting will generate a lot of heat of hydration Because concrete is adiabatic material , the heat of hydration can not be released in a timely manner , resulting in mass concrete internal temperature rising, the formation of the temperature difference between the inside and outside of the concrete when the temperature difference is too large or lift too fast , coagulation temperature cracks will appear . The temperature cracks will reduce the carrying capacity of the pile cap foundation , reduce the durability of concrete , causing the building security risks , have done great harm , therefore , must be on the temperature control of mass concrete . In this paper, the cap construction of the three projects carried out in-depth research of the temperature control of mass concrete , specific work includes the following aspects: ( 1 ) This paper describes the dangers of mass concrete temperature cracks and the formation mechanism , demonstrates the necessity and feasibility of preventing mass concrete temperature cracks . ( 2) discusses the heat equation and the method of calculation of the temperature field inside the concrete cap , the analysis of a variety of factors affect the internal temperature of concrete , provides a way to effectively control the maximum temperature inside the concrete , reducing concrete temperature difference between inside and outside , to prevent rapid temperature changes of concrete . ( 3 ) mass concrete reference to other engineering the thermostat measures , combined with the specific circumstances of the three projects , the design of a set of specific temperature control measures . Select a lower heat of hydration of cement , aggregate and good thermal conductivity , to take on the various links in the pouring of concrete measures to control the temperature rise of the concrete , drawn up help to reduce the maximum temperature of the concrete , to reduce the temperature difference between inside and outside of concrete construction organization strict implementation of the construction and a good insulation conservation measures , and achieved the desired results . The study showed that : reasonable concrete mix, the quality of raw materials is fundamental to the success of mass concrete temperature control , with the ratio of raw materials optimization , you can reduce the internal temperature of concrete : a reasonable construction organization , the correct construction program with effective temperature control the program is a guarantee for the success of mass concrete temperature control . In addition, the temperature field of mass concrete numerical calculation is very sensitive to the boundary conditions , mass concrete temperature gradient and the temperature difference between issues need further study later .

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Concrete and reinforced concrete works
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