Journal Home Online First Current Issue Archive For Authors Journal Information 中文版

Strategic Study of CAE >> 2002, Volume 4, Issue 7

Infinite Complanation for Semi-infinite Problem when Mass Concrete Hit by Cold Wave

Department of Civil Engineering, Three Gorges University, Yichang, Hubei 443002, China

Funding project:中国博士后科学基金项目,教育部"985"项目,湖北省自然科学基金项目 Received: 2002-01-16 Revised: 2002-03-14 Available online: 2002-07-20

Next Previous

Abstract

Almost all the cracks in mass concrete are surface cracks. Full-section cracks and deep-level cracks are mainly developed from early surface cracks. This paper describes the characteristics of the surface cracks of mass concrete firstly. Then a semi-infinite plane model for surface temperature calculation is compared with infinite model. The temperature of surface zone in mass concrete under different boundaries is controlled by semi-infinite model, and is transferred to and calculated by an equivalent infinite model under certain conditions. If the temperature declining duration of air is no more than the critical time when the disturbed front perforates half-thickness of the infinite plate, it may be expressed as multi-line process approximately, and most importantly the temperature in surface zone of concrete can be calculated with the formula educed by infinite model. With 400 mm × 400 mm × 220 mm concrete specimens, the temperatures in surface zone are experimentally researched under outside environment, which has attested the method presented. It is also found that the new method to describe declining process of air temperature is more accurate than the method prevailing, and there does exist an opportunity to develop a physical model for the temperature process of mass concrete within a short period of time.

Figures

图1

图2

图3

图4

图5

图6

图7

图8

图9

References

[ 1 ] 朱伯芳.大体积混凝土的温度应力与温度控制[M ].北京:中国电力出版社, 1998.733~734, 68~69

[ 2 ] KapliaD , FalkowskyJ, PlawskyJL .Thermaleffectsduringcuringofconcretepavements[J].ACIMaterialJournal, 1997, 94 (MarchApril) :118~128

[ 3 ] ChanvillardG , AloiaLD .Concretestrengthestimationatearly ages:modificationofthemethodofequivalentage[J].ACIMaterialJournal, 1997, 94 (NovDec) :520~530

[ 4 ] EricA , BrunoM .Modelingthethermalstressesatearlyages[J].ACIMaterialJournal, 1997, 94 (MarchApril) :577~587

[ 5 ] ChengjuGuo, Early agebehaviorofPortlandcement[J].ACIMaterialJournal.1997, 91 (JanFeb) :118~128

[ 6 ] HuangDahai, LiuGuangting.Surfacecrackingofearly ageconcretebysolarradiation[A ].ACMSM17, ProceedingsofAustraliaConferenceonMaterialandStructureMechanism[C ].GriffithUniversity, Australia, 2002, June:12~14

[ 7 ] 朱伯芳.大体积混凝土的温度应力与温度控制[M ].北京:中国电力出版社, 1998.251~252, 114~117

[ 8 ] 奥齐西克MN .热传导[M ].俞昌铭译.北京:高等教育出版社, 1983.299~305 link1

[ 9 ] 张子明, GargaVK .寒潮袭击时大体积混凝土的温度应力[J].河海大学学报, 1994, (11) :94~97 link1

[10] 刘光廷, 黄达海.混凝土湿热传导与湿热扩散特性的试验研究[J].三峡大学学报, 2002, (1) :15~23 link1

Related Research