During circumstances, mainly in huge constructions, such as dams,

During
the procedure of setting and hardening in concrete, the temperature profile displays
a gradual nonlinear distribution due to the evolution of heat of hydration in
cement. When Portland cement is mixed with water, warmth is liberated. This warmth is called the heat of hydration, the result of the exothermic element reaction between cement and water. The heat produced by the cement’s hydration increases the temperature of concrete. For the
period of concrete building, the warmth is dissipated into the soil or the air and causing temperature variations inside
the construction are not important. But, in certain circumstances, mainly in huge
constructions, such as dams, mat
foundations, or some section more than 
meter or yard thick, the warmth cannot be readily released. The mass concrete can then reach great inside
temperatures, particularly throughout hot weather
construction 1? Pre-stressed
concrete is unique of the most reliable, durable,
and extensively used construction materials in construction and bridge projects around the world. It has made
significant influences to the construction manufacturing, the precast manufacturing industry, and the cement industry such as a whole. It has led to anenormous array of structural applications, including buildings, bridges,
nuclear power vessels, TV towers, and offshore drilling platforms2. The
prestressed concrete of a box girder is large in volume, measured in unit per
volume of concrete, and obviously has mass volume characteristics. After a great quantity of hydration heat is produced, the heat doesn’t emit in a short time because
the temperature difference between the inside and outside of the construction is excessively large which causes large temperature stress to make the concrete flaw 3, 4. The cracks caused by thermal stress have characteristics of wide cracks. The existence
of cracks will have an adverse effect on the bearing capacity and durability of
structures. In recent years, the study of become important, and
experience has been accumulated 5-7. Few researches has focused on single box
single room, single box two room, single box three room, which are high
significance to an ultra-wide section box girder. A special bridge in Qing
Yijiang is a prestressed concrete continuous box girder bridge of curved
four-line high speedpassenger lane. Based on
the analysis of Qing Yijiang bridge single box three rooms continuous beam zero block. During the manufacture of the project, the
hydration field heat information was collected. In this paper, comparison of collected filed data and numerical
simulation using ANSYS software is presented

x

Hi!
I'm Roxanne!

Would you like to get a custom essay? How about receiving a customized one?

Check it out