An Investigation on Behaviors of Mass Concrete in Cua-Dai Extradosed Bridge Due to Hydration Heat

2021 ◽  
pp. 446-457
Author(s):  
Nguyen Van My ◽  
Vo Duy Hung
Keyword(s):  
Hydration Heat ◽  
Mass Concrete

The Arch Support Construction and Hydration Heat Analysis of the First Bridge over Yangtze River in Hejiang

2013 ◽  
Vol 291-294 ◽  
pp. 1122-1127
Author(s):  
Yan Feng Luo ◽  
Da Yan Qin ◽  
Yun Zhang
Keyword(s):  
Yangtze River ◽  
Casting Process ◽  
Hydration Heat ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Element Analysis ◽  
Early Hydration ◽  
Mix Proportion ◽  
Arch Support ◽  
Heat Preservation

The arch support of the First Bridge over Yangtze River in Hejiang used the stratified and graded casting process in mass concrete pouring process. By means of optimizing the concrete mix proportion design, using high mixing amount of fly ash concrete, reducing heat release rate of concrete early hydration heat, delaying the time of maximum temperature rise, and combining turn-over forms and water storage and other surface heat preservation measures, the temperature difference between inside and outside concrete was reduced and the cracking of mass concrete was avoided. Finite element analysis of hydration heat was done to verify the feasibility of the construction scheme.

Properties of Autogenous Shrinkage in High-Strength Mass Concrete According to Hydration Heat Velocity

2011 ◽  
Vol 311-313 ◽  
pp. 1993-1999
Author(s):  
Kyung Mo Koo ◽  
Gyu Yong Kim ◽  
Hiroyuki Miyauchi ◽  
Yeon Woo Kang
Keyword(s):  
Autogenous Shrinkage ◽  
High Strength ◽  
Hydration Heat ◽  
Early Age ◽  
Mass Concrete ◽  
Close Relationship

The early-age properties and relationships between hydration heat and autogenous shrinkage in high-strength mass concrete are investigated through analysis of the history curves of hydration heat and autogenous shrinkage. To reduce the hydration heat velocity, micro encapsulated retarder (MR) that could retard cement reaction was applied. In the result of research, the hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the reduction of size specimen and use of the retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.

scholarly journals STUDY ON ARRANGEMENT OF COOLING WATER PIPE TO CONTROL HYDRATION HEAT OF CONCRETE IN BEAM OF CABLE-STAYED BRIDGE

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
Long Liu ◽  
Saisai Yu ◽  
Wentao Xu ◽  
Zhilong Wang
Keyword(s):  
Finite Element ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Hydration Heat ◽  
Inlet Temperature ◽  
Mass Concrete ◽  
Water Pipe ◽  
Finite Element Software ◽  
Joint Section

The box girder joint section of the Yangtze River Highway Bridge is taken as the research background, and the finite element software MIDAS/FEA is used to simulate the hydration heat of concrete to the layout of cooling water pipe in building mass concrete. The finite element calculation results are in well agreement with the measured data. On this basis, the influence of changing the diameter and distance of the cooling water pipe, the inlet temperature and the flow rate on the temperature of hydration heat is studied. The results show diameter of the cooling water pipe and inlet temperature have a significant effect on the temperature of hydration heat. The change of water flow rate has little effect on the temperature of hydration heat. It provides a reference for the layout of the same concrete cooling water pipe arrangement.

Mechanical Properties Test Research on Mass Concrete Mixed with Different Fly Ash Bulk Volume

2012 ◽  
Vol 204-208 ◽  
pp. 3664-3667
Author(s):  
Jing Hong Liu ◽  
Xiao Hua Liu ◽  
Wen Han
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Hydration Heat ◽  
Mass Concrete ◽  
Test Results ◽  
Fly Ash Concrete ◽  
Mechanics Performance ◽  
Bulk Volume ◽  
Strength And Durability ◽  
Tensile Strain Capacity

The concrete would crack when the temperature stress caused by hardening concrete hydration heat and shrinkage action were over the concrete’ tensile strength. The concrete were added with different amount of fly ash in order to increase concrete’ tensile strength and ultimate tensile strain capacity or consider economic perspective. The mechanics performance tests were carried on mass concrete with different fly ash bulk volume. The test results showed that the fresh fly ash concrete’ workability, hydration heat, compressive strength and durability were obvious superior compared with ordinary concrete.

scholarly journals Feasibility of Using Phase Change Materials to Control the Heat of Hydration in Massive Concrete Structures

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Won-Chang Choi ◽  
Bae-Soo Khil ◽  
Young-Seok Chae ◽  
Qi-Bo Liang ◽  
Hyun-Do Yun
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Concrete Structures ◽  
Experimental Tests ◽  
Heat Of Hydration ◽  
Hydration Heat ◽  
Experimental Results ◽  
Mass Concrete

This paper presents experimental results that can be applied to select a possible phase change material (PCM), such as a latent heat material (LHM), to control the hydration heat in mass concrete structures. Five experimental tests (microconduction, simplified adiabatic temperature rise, heat, and compressive strength tests) were conducted to select the most desirable LHM out of seven types of inorganic PCM used in cement mortar and to determine the most suitable mix design. The results of these experimental tests were used to assess the feasibility of using PCM to reduce hydration heat in mass concrete that was examined. The experimental results show that cement mortar containing barium- [Ba(OH)2·8H2O] based PCM has the lowest amount of total hydration heat of the cement pastes. The barium-based PCM provides good latent heat properties that help to prevent volume change and microcracks caused by thermal stress in mass concrete.

Hydration Heat Characteristics of Mass Concrete Using Phase Change Material

2017 ◽  
Vol 17 (6) ◽  
pp. 1-10
Author(s):  
Sangkyu Ji ◽  
◽  
Seokjoon Jang ◽  
Jihyeon Kim ◽  
Wanshin Park ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Hydration Heat ◽  
Mass Concrete ◽  
Change Material

Analysis of hydration heat and autogenous shrinkage of high-strength mass concrete

2011 ◽  
Vol 63 (5) ◽  
pp. 377-389 ◽  
Author(s):  
Gyu-Yong Kim ◽  
Eui-Bae Lee ◽  
Jeong-Soo Nam ◽  
Kyung-Mo Koo
Keyword(s):  
Autogenous Shrinkage ◽  
High Strength ◽  
Hydration Heat ◽  
Mass Concrete

Research on Thermodynamical Performance of Concrete with Excessive Fly Ash Added in the Pile Cap of Well Tower

2011 ◽  
Vol 243-249 ◽  
pp. 6087-6092
Author(s):  
Xiang Zong ◽  
Xiang Wang
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Setting Time ◽  
Hydration Heat ◽  
Favorable Effect ◽  
Mass Concrete ◽  
Mix Proportion ◽  
Pile Cap ◽  
Time Test ◽  
Simulated Test

To meet the demand of high performance of mass concrete in a pile cap of well tower, excessive replacement of fly ash was applied to the mass concrete. Based on the theory of hydration heat of cement, several thermal parameters of mix proportion were analyzed and simulated test analyses and setting time test analyses were conducted in the laboratory. The results and data collected in the project locale both show that applying excessive replacement of fly ash reduces hydration heat of mass concrete in the pile cap of well tower, which extends setting time in mass concrete and avoids the cracks caused by temperature stress. The results achieve favorable effect and provide reference for design and construction of mix proportion in the project of mass concrete.

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