Application of Temperature Control and Crack Prevention Measures of Mass Concrete in Road and Bridge Engineering

2021 ◽  
Keyword(s):  
Temperature Control ◽  
Bridge Engineering ◽  
Mass Concrete ◽  
Prevention Measures

Exploration for Maintenance Measures and Temperature Control of Mass Concrete Pile Caps

2013 ◽  
Vol 671-674 ◽  
pp. 2032-2037
Author(s):  
Chen Ming Yu ◽  
Jun Tong Qu ◽  
Zhi Hong Ran ◽  
Hao Ying ◽  
Fan Tao Meng
Keyword(s):  
Temperature Variation ◽  
Temperature Control ◽  
Concrete Structures ◽  
Heat Of Hydration ◽  
Bridge Engineering ◽  
Mass Concrete ◽  
Construction Time ◽  
Crack Control ◽  
Thermal Cracks ◽  
Pile Caps

Distress in mass concrete is a problem in highway and bridge engineering. These mass concrete structures craze not by external loads, the temperature variation caused by heat of hydration and the temperature stress caused by concrete shrinkage are the main causes () for the leaks [1]. Therefore, the thermal stress and the temperature control have significant meaning in the mass concrete structures. Thermal cracks will break the structure globality and also decrease the durability of the structures during the construction time. In addition, the temperature variation will have a remarkable affection on the stresses variation of the structures during the service time [2]. This paper will discuss the temperature monitoring and the crack control projects of the mass concrete based on the cushion cap of an extradosed cable-stayed bridge which is being constructed.

scholarly journals Temperature Control Measures and Temperature Stress of Mass Concrete during Construction Period in High-Altitude Regions

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Zhenhong Wang ◽  
Li Tao ◽  
Yi Liu ◽  
Jiang Yunhui
Keyword(s):  
High Altitude ◽  
Temperature Stress ◽  
Temperature Control ◽  
Lower Layer ◽  
Temperature Drop ◽  
Control Measures ◽  
Mass Concrete ◽  
Prevention Measures ◽  
Concrete Gravity Dam ◽  
Climate Conditions

The focus on the development of China’s vast hydropower resources has shifted to Tibet and other plateau regions. These areas are high-altitude regions whose basic climatic characteristics are as follows: dry climate, significant differences in daily temperature, and strong solar radiation. If a dam is built under such special climate conditions, specific and strict temperature control and crack prevention measures should be taken. Therefore, this study explores the temperature control standards, as well as temperature control and crack prevention measures, for concrete in high-altitude regions using three-dimensional finite element methods and based on the concrete gravity dam in Tibet in combination with the characteristics of material properties that are disadvantageous to temperature control and crack prevention. The temperature drop process can be optimized in time, and the temperature drop rate can be controlled to prevent excessive scale and temperature drop rates. Moreover, the temperature gradient can be spatially optimized, and thus, the differences in foundation temperatures, upper- and lower-layer temperatures, and internal and external temperatures can also be reduced. The research shows that the recommended temperature control and crack prevention measures can effectively reduce temperature stress. This study has a significant value as a reference for similar projects in high-altitude regions.

Research on Crack Prevention of Premixed Concrete of Pump Station Built in Summer

2014 ◽  
Vol 716-717 ◽  
pp. 379-382
Author(s):  
Ya Jing Bie ◽  
Jian Yong Huang ◽  
Yong He ◽  
Ming Di Zhu ◽  
Nan Nan Zhang ◽  
...  
Keyword(s):  
Temperature Control ◽  
Cement Hydration ◽  
Mass Concrete ◽  
Water Cooling ◽  
Prevention Measures ◽  
Unsteady Temperature ◽  
Pump Station ◽  
Unsteady Temperature Field ◽  
Result Analysis ◽  
Important Significance

In the summer of southern cities of China, the duration of high temperature becomes longer which requires stricter temperature control and crack prevention measures for mass concrete in construction. By using finite element method for unsteady temperature field and stress field a simulation is made for a pump station built in summer. The cement hydration velocity of this engineering is so high that makes the temperature control very difficulty. Through result analysis of different cases, some optimized measures which include surface preservation and water cooling are proposed. It has an important significance for concrete structure in the same area.

Temperature Control and Anti-Cracking Measures for a High-Performance Concrete Aqueduct

2013 ◽  
Vol 405-408 ◽  
pp. 2739-2742 ◽  
Author(s):  
Zhen Hong Wang ◽  
Shu Ping Yu ◽  
Yi Liu
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Apparent Temperature ◽  
Mass Concrete ◽  
Water Pipe ◽  
Thin Walled ◽  
Water Pipe Cooling

To solve the problem of cracks developing on thin-walled concrete structures during construction, the authors expound on the causes of cracks and the crack mechanism. The difference between external and internal temperatures, basic temperature difference and constraints are the main reasons of crack development on thin-walled concrete structures. Measures such as optimizing concrete mixing ratio, improving construction technology, and reducing temperature difference can prevent thin-walled concrete structures from cracking. Moreover, water-pipe cooling technology commonly used in mass concrete can be applied to thin-walled concrete structures to reduce temperature difference. This method is undoubtedly a breakthrough in anti-cracking technology for thin-walled concrete structures, particularly for thin-walled high-performance concrete structures. In addition, a three-dimensional finite element method is adopted to simulate the calculation of temperature control and anti-cracking effects f. Results show the apparent temperature controlling effect of water-pipe cooling for thin-walled concrete structures.

A new method for hydraulic mass concrete temperature control: Design and experiment

2021 ◽  
Vol 302 ◽  
pp. 124167
Author(s):  
Xiaochun Lu ◽  
Bofu Chen ◽  
Bin Tian ◽  
Yangbo Li ◽  
Congcong Lv ◽  
...  
Keyword(s):  
Temperature Control ◽  
Control Design ◽  
New Method ◽  
Mass Concrete ◽  
Concrete Temperature

Cracking and Temperature Control in Mass Concrete Construction

2012 ◽  
Vol 446-449 ◽  
pp. 841-845
Author(s):  
Zhong Qing Xu ◽  
Yong Gang Ding ◽  
Chang Yi Zhai ◽  
Qiang Jun Li
Keyword(s):  
Temperature Control ◽  
Mass Concrete ◽  
Concrete Construction

scholarly journals Study on Temperature Control and Crack Prevention of Mass Concrete for Large Powerhouse Constructed in Cold Area

2019 ◽  
Vol 275 ◽  
pp. 02009
Author(s):  
Qiaorong Sun ◽  
Bingyong Ding ◽  
Zaixin Zheng ◽  
Running Du ◽  
Sheng Qiang
Keyword(s):  
Temperature Control ◽  
Large Scale ◽  
Complex Structure ◽  
Cold Climate ◽  
Hydropower Station ◽  
Mass Concrete ◽  
Unusual Structure ◽  
Finite Element Program ◽  
Cold Area ◽  
Multiple Materials

Due to complex structure, large scale, and cold climate, the temperature field and stress field during construction of BoYi Station is different with ordinary mass concrete. Therefore the corresponding crack prevention method must be explored. In order to simulate the complicated construction course, cold climate, multiple materials and unusual structure, a finite element program is adopted. In 5 numerical simulation cases, different temperature control methods are tried to decrease the tensile stress of mass concrete. Based on the simulation analysis and combined with the engineering experience, the scheme and indexes of temperature control and crack prevention are recommended. The mainly measures are controlling pouring temperature, insulation of concrete surface, pipe cooling, block partition and extra steel bar reinforcement. The values of temperature indexes are sharply lower than that of ordinary hydropower station mass concrete. The suggested measures and indexes in this paper, which are various with season, structure position and material, may provide some reference to similar large hydropower station workshop in cold area.

Research on Mass Concrete Construction Techonogy of Raft Foundation of Hongyun Building

2013 ◽  
Vol 690-693 ◽  
pp. 709-713 ◽  
Author(s):  
Su Hua Yin ◽  
Yuan Huang ◽  
Ying Hui Yuan
Keyword(s):  
Temperature Control ◽  
Mass Concrete ◽  
Construction Technology ◽  
Concrete Construction ◽  
Core Tube ◽  
The Core ◽  
Raft Foundation ◽  
Concrete Base

The foundation of A tower of Hongyun building is made of raft board foundation which is 4200mm in the thickness and 3500mm beside side of the core tube. It is researched that the raft foundation mass concrete construction technology is expatiated from temperature and cracks of the raft foundation and the temperature control and monitoring of the concrete base slab construction and concrete curing.

Study on Crack Prevention Measures of Mass RCC Dams

2013 ◽  
Vol 743 ◽  
pp. 3-8
Author(s):  
Jian Guo Jing ◽  
Min Zhi Liu ◽  
Shao Jun Zeng ◽  
Lin Xu
Keyword(s):  
Temperature Control ◽  
Control Measures ◽  
Simple Construction ◽  
Prevention Measures ◽  
Construction Period ◽  
The Way

Actually, both simple construction and fast construction are advantages of RCC dams. In view of taking strict temperature control measures, those are turned to be disadvantages instead. The way of fast pouring and the measure of controlling the placing temperature are introduced to RCC dams and 6 cases are analyzed separately to explain the effect of their crack prevention. It is concluded that controlling only the last layer placing temperature of concrete lifts can remarkably decrease the stress of working plane concrete during off period. Furthermore, the pouring way of thick lifts and short off period do not deteriorate the temperature and stress but rather has an impressive effect on crack prevention and construction period contraction.

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