Temperature Effect of Concrete Hydration Heat under Atmospheric Wind Based on Fluid-Solid Coupling

2021 ◽  
Author(s):  
Moyan Zhang ◽  
Hong Xiao ◽  
Meng Wang ◽  
Mahantesh M. Nadakatti ◽  
Peng Chen
Keyword(s):  
Temperature Effect ◽  
Hydration Heat ◽  
Concrete Hydration

Analysis of Model Test Data for CFG Group Piles in Permafrost Areas

2014 ◽  
Vol 501-504 ◽  
pp. 16-19
Author(s):  
Zhao Jian Luan ◽  
Qiang Xin ◽  
Yan Min Jia
Keyword(s):  
Temperature Field ◽  
Heat Effect ◽  
Frozen Soil ◽  
Hydration Heat ◽  
Measured Temperature ◽  
Geological Conditions ◽  
Soil Temperatures ◽  
Concrete Hydration ◽  
Group Piles ◽  
Model Temperature

In this paper, the author simulates geological conditions of permafrost areas, establi-shes CFG group piles indoor model, observes the pile and frozen soil temperature field, then compares the calculated results of the group piles and frozen soil temperatures under concrete hydration heat effect by using ABAQUS with the measured temperature data, thus determines the applicability of ABAQUS for analysis of CFG group piles temperature in permafrost areas, in order to analyze temperature distribution regularities of group piles and frozen soil under concrete hydration heat effect, thermal perturbation range of CFG group piles in permafrost areas, and effects of different concrete molding temperature on model temperature field.

Possibilities of Regulation of Temperature in Concrete during Hydration by Means of Selection of Suitable Input Materials

2014 ◽  
Vol 507 ◽  
pp. 199-203 ◽  
Author(s):  
Rudolf Hela ◽  
Jiri Zach ◽  
Martin Sedlmajer
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Hydration Heat ◽  
Concrete Hydration ◽  
Furnace Slag ◽  
Selection Of

Paper is focused on development of hydration heat in concrete in time. Possible ways of reduction of temperature during concrete hydration are mentioned. Paper presents study of possibilities of regulation temperature in concrete during hydration by selection of suitable input components. Blast furnace slag and micronized limestone were added to pure Portland cement; several variants of proportions were proposed.

The Hydration Heat Analysis for Sealing Concrete of Swivel Construction Open Thin Wall Arch

2012 ◽  
Vol 253-255 ◽  
pp. 440-444
Author(s):  
Xiong Hui Feng ◽  
Zi Qiang Zhu ◽  
Zhi Yong Li ◽  
Xin Wu
Keyword(s):  
Simulation Model ◽  
Heat Effect ◽  
Hydration Heat ◽  
Thin Wall ◽  
Arch Bridge ◽  
Boundary Constraint ◽  
Constant Coefficients ◽  
Complex Boundary ◽  
Concrete Hydration ◽  
Simulation Parameters

The sealing concrete of arch bridge will be constructed after swivel construction of it finished. The concrete has such characteristics like huge size, smaller heat radiating area and more complex boundary constraint. According to the cracking situation of this type bridges in recent years, the paper established hydration heat simulation model of it using MIDAS2010 program and numerical analyzed for the model. The hydration heat constant coefficients and placing temperature of the concrete hydration heat effect have been analyzed by simulation parameters base on that. And the results showed that it is an important reason causing the cracking of the concrete.

Experimental Study on Temperature Fields of Dumbbell-Shape Section of CFST Arch Rib and its Effects

2010 ◽  
Vol 163-167 ◽  
pp. 2564-2570
Author(s):  
Bin Yang ◽  
Jin Hua Huang ◽  
Chun Jiao Lin ◽  
Xing Kun Wen ◽  
Mao Jun Liu
Keyword(s):  
Temperature Field ◽  
Temperature Effect ◽  
Time History ◽  
Steel Tube ◽  
Hydration Heat ◽  
Temperature Fields ◽  
Molding Process ◽  
Single Wave ◽  
Arch Bridge ◽  
The Impact

Based on the investigation of a constructing dumbbell-shaped concrete-filled steel arch bridge in Nanning, Guangxi, continuous on-site experimental researches on temperature field and its effects were carried out under the influence of hydration heat of concrete in the molding process of concrete-filled dumb-bell steel tubular arch bridge. On the basis of measured data, analysis on time-history law of temperature field and its effect under the impact of hydration heat of concrete of composite structure of concrete-filled steel tubes is made. The results reveal that temperature variation of hydration heat of the concrete within the steel tube is showed as follows: “Temperature up-continuous high temperature-temperature down-balance”. The structural temperature field, generated under the effect of hydration hea in the process of molding arch rib, is nonlinear temperature field. Concrete hydration temperature effect of crown section basically changes with temperature field simultaneously, while the residual strain of arch foot section is relatively large; hydration temperature effect of L/4 Section emerges peak fluctuations in concrete pouring process and finally levels off. Hydration temperature field of concrete has a great effect on crown section, which makes the steel tube continuously withstand the tension and compression alternatively, while the influence on the arch foot steel tube is not obvious. Surface strains of L/8, L/4, 3L/8 sections of steel tube transit from single-wave peak to dual-wave peak and finally turn into a single wave peak.

Numerical Simulation of Temperature Effect of Concrete Hydration

2008 ◽  
Vol 400-402 ◽  
pp. 483-488 ◽  
Author(s):  
Lu Wang ◽  
Ying Min Li ◽  
Li Ping Liu ◽  
Shang Ling Xue ◽  
Xun Dai ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Effect ◽  
Temperature Stress ◽  
Superposition Principle ◽  
Material Behavior ◽  
Test Results ◽  
Heat Generation Rate ◽  
Scaled Model ◽  
Concrete Hydration ◽  
Simulation Results

Based on the improved equation of concrete heat-generation rate and an improved calculation method of temperature stress, the temperature effect of concrete hydration heat is simulated successfully in ANSYS. Comparison between the numerical simulation results and test results of a scaled model of blast furnace foundation indicates that the calculated temperature field based on the improved equation and method is much closer to that of test than which obtained by the old equation and method. By using the stress superposition principle, the temperature-stress field can be calculated with considering the change of material behavior with temperature and time.

Study on Constructional Reinforcement for the Foundation of Blast Furnace due to Temperature Effect

2011 ◽  
Vol 94-96 ◽  
pp. 1545-1548
Author(s):  
Ying Min Li ◽  
Lu Wang ◽  
Li Ping Liu
Keyword(s):  
Blast Furnace ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Tensile Stress ◽  
Temperature Effect ◽  
Circular Area ◽  
Concrete Hydration ◽  
Concrete Hardening ◽  
Small Spacing

Based on the test and numerical analysis, the paper studied the constructional reinforcement of blast furnace foundation under the influence of concrete hydration and top temperature. The results indicate that constructional reinforcement should be thinner and have a small spacing. Stress concentration always appears around the corner and constraints of blast furnace foundation, where should be strengthened with constructional reinforcements. In order to prevent cracks caused by internal tensile stress during concrete hardening, it is necessary to place temperature reinforcement inside the foundation. Temperature effect should be considered at the circular area on top of blast furnace foundation and should be strengthened with constructional reinforcements.

Embedded piezoelectric transducers based early-age hydration monitoring of cement concrete added with accelerator/retarder admixtures

2020 ◽  
pp. 1045389X2096991 ◽  
Author(s):  
Demi Ai ◽  
Chengxing Lin ◽  
Hongping Zhu
Keyword(s):  
Heat Effect ◽  
Hydration Heat ◽  
Strength Development ◽  
Early Age ◽  
Strength Gain ◽  
Element Analysis ◽  
Electromechanical Impedance ◽  
Hardening Process ◽  
Concrete Hydration ◽  
Early Age Hydration

Accelerator/retarder admixtures are often added into concrete to improve its early-age strength, which needs to be effectively monitored during its hardening process. The electromechanical impedance (EMI) technique has validated its effectiveness for concrete hydration monitoring, this study attempted to extend the EMI technique to monitor 28-day age of strength gain in concrete that added with accelerator/retarder admixtures. Two types of new piezoelectric (PZT) transducers namely cement/aluminum embedded PZT (CEP/AEP) were proposed for EMI monitoring. The feasibility of the CEP and AEP was first verified via finite element analysis, where hydration heat effect on the two types of transducers was comparatively evaluated by numerical modeling. In the experiment, CEP/AEP transducers were applied to monitor the strength gain in concrete cubes, where characteristics of EMI signature and its statistical indices including root mean square deviation (RMSD) and mean absolute percentage deviation (MAPD) were analyzed and correlated to strength development in concrete. Monitoring results demonstrated that concrete hydration triggered by retarder/accelerator were successfully captured by EMI signature. RMSD and MAPD indices further indicated that AEP had preferable performance than CEP transducer for monitoring early-age strength gain of concrete, as it could immune from hydration heat effect.

The Effect of Hydration Rate on Concrete Simulation with Cooling Pipe

2011 ◽  
Vol 71-78 ◽  
pp. 4907-4911
Author(s):  
You Ping Zhu ◽  
Tong Chun Li ◽  
Jing Chen
Keyword(s):  
Temperature Effect ◽  
Three Dimensional ◽  
Complex Problem ◽  
Effect Of Temperature ◽  
Mass Concrete ◽  
Computational Results ◽  
Hydration Rate ◽  
Cooling Pipe ◽  
Concrete Hydration ◽  
Temperature Interaction

Hydration rata and temperature interaction is a complex problem. This paper focuses on variation of concrete hydration and its effect on temperature and stress filed simulation of concrete with cooling pipe. Through three-dimensional specified project with two methods that include consider effect of temperature on hydration rate and no consider effect of temperature on hydration rate, the computational results have been compared and the differences have been analyzed. So we advised that the temperature effect on hydration rate should been considered in temperature stress filed simulation of concrete with cooling pipe. It provide basis to the construction of mass concrete.

Study on the Numerical Simulation of Massive Concrete Sidewall Hydration Heat under Negative Temperature Transient Boundary

2010 ◽  
Vol 163-167 ◽  
pp. 2560-2563 ◽  
Author(s):  
Dong Wei Li ◽  
Ju Hong Fan ◽  
Hai Ming Chen ◽  
Jun Hao Chen ◽  
Ren He Wang
Keyword(s):  
Numerical Simulation ◽  
Reference Value ◽  
Frozen Soil ◽  
Hydration Heat ◽  
Construction Process ◽  
Distribution Law ◽  
Massive Concrete ◽  
Frozen Wall ◽  
Concrete Hydration ◽  
The Impact

To get massive concrete sidewall hydration heat and the frozen wall’s temperature distribution law, the temperature monitor and analysis were applied in the construction process of deep frozen shaft. Combined with frozen sidewall temperature field numerical calculation finite element method, analyzed the concrete hydration heat on the impact of the artificially frozen wall in the frozen wall’s construction process. Concrete hydration heat release made rapid temperature rise of concrete, the temperature was gradually cooling down effected by the frozen wall’s low temperature and the concrete permanent supporting borders. During large release of concrete hydration heat, the frozen soil curtain was partial heating and melting, the Interface moved quickly and reached the maximum. The results showed that: the change laws of the numerical simulation and the measure point temperature were uniform, and their values were more consistent. This had a certain reference value in improving freezing construction methods and the design of deep frozen wall.

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