Thermal Cracking Control of Mass Concrete by Vertical Pipe Cooling Method

Abstract

In case of the slender mass concrete like attached wall, retaining wall and bridge tower, the low heat cement and the control joint are mainly used for thermal cracking control. However, even if these cracking control methods are considered, it is impossible to control thermal cracks perfectly, because the external restraint is largely in these mass concrete. Because these cracks occurring in slender mass concrete members almost penetrate concrete member, the special cracking control is demanded in these mass concretes. The vertical pipe cooling method improving existing pipe cooling method was developed for the active thermal cracking control of slender mass concrete, and applied at the field attached wall. In results, the maximum temperature dropped more than 10℃ by vertical pipe cooling method, and the cracks decreased about more than 50%. 키워드 : 온도균열, 세장한 매스콘크리트, 연직파이프쿨링 공법Keywords : Thermal cracks, Slender mass concrete, Vertical pipe cooling method

Research on CART Model of Mass Concrete Temperature Prediction Based on Big Data Processing Technology

“…Mass concrete will generate a lot of hydration heat during the pouring process. Due to the large size of concrete structure, poor thermal conductivity of concrete, construction constraints, and temperature changes, temperature cracks usually occur during construction [1]- [6]. The mechanism of temperature cracks is mainly: the mass concrete structure generates stress and strain due to the temperature difference and temperature gradient between the inside and outside.…”