Temperature Monitoring And Crack Controling On Anchor Massive Concrete Of HuangPu Bridge In Guang Zhou

With massive concrete structures of bridge emergence, Currently bridge construction with cracking phenomenon happened commomly, because of concrete crack controling measures are inadequate, Impact on the performance of concrete Seriously, So study temperature cracks control techniques for bridge with massive concrete construction, Prevent cracks. Ensure the large volume of concrete quality, Improve the durability of concrete, Determine the bridge safty .It is of great theoretical and practical significance.Massive concrete cracks temperature are very complex, Involving the structure, building materials, construction, geotechnical, environmental and other factors. And component sizes, cement, cement consumption, construction conditions and other factors change, it is difficult to use the traditional method of temperature control to prohibit cracks effectively.Therefore, This paper analyzes temperature crack controling of concrete existing situation at home and abroad, Based on temperature control Guangzhou Huangpu bridge project, System study Guangzhou Huangpu Bridge Anchorage massive concrete temperature control and crack control technology, Optimize the match design of anchor. Start simulation analysis considering more factors of massive concrete temperature field, Raise the effective crack control measures,real-timely monitor internal temperature of concrete changes, Prove activity of fly ash and slag concrete hydration temperature process, Timely modify the measure, Control the temperature crack happening, the main topics have included the following :(1) Utilize the large amount of activity of fly ash and slag "complementary strengths effect" with dense frame accumulation theory to optimize concrete design, By adding slag, Under Guaranteeing the quality of concrete Anchorage ,Maximum reduce the amount of cement, Enable slag amounted to a 120kg/m~3 in floor, enable slag amounted to a 140kg/m3 in roof, With the temperature forecast and the conservation of heat and humidity ,Achieve effective control measures.(2) Use finite element software for Anchor Concrete temperature field analysis, forecast temperature of massive concrete in the space-time distribution and apply the results to the actual mass concrete temperature monitoring and control of cracks, Assess and analysis concrete ratio reasonable and guidance concrete construction technology.(3) Adopt the concrete laying sensitive internal temperature sensor, with computer monitor concrete internal temperature changes and acquire the massive concrete internal temperature variation.(4) Comparative analysis the final hydration temperature forecasts and the measured values, consider hydration of slag temperature, introduct slag reduced coefficient K2=0.31, Made maximum temperature of hydration formula in massive concrete containing slag and fly ash admixture.Considering the factual project situation, The project base on the project forecast and simulate the temperature field before construction, Optimize concrete match. During the construction , The dynamic temperature monitoring and the effective temperature controling prevent temperature cracks in the floor and the roof, Shorten the construction period/reduce the cost of the project. Temperature control measures is proper. Finally, The forecasts and measured temperature compara and analysis, rise new hydration temperature formula, Accumulate valuable experience in engineering applications for the future of the massive concrete cracks control.