Numerical Simulation of the Hot Weather on Concrete at Early Age

2016 ◽  
Vol 7 (6) ◽  
pp. 185
Author(s):  
Mouna Barhmi ◽  
M'hammed Merbouh ◽  
Hamid Khachab ◽  
Nabil Bella ◽  
Mohammed El Mir ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Early Age ◽  
Hot Weather

scholarly journals Effects of Shrinkage Reducing Agent and Expansive Additive on Plastic Shrinkage of Mortar at Different Temperatures

2018 ◽  
Vol 206 ◽  
pp. 02002
Author(s):  
Sarapon Treesuwan ◽  
Komsan Maleesee ◽  
Shigeyuki Date
Keyword(s):  
High Temperature ◽  
Setting Time ◽  
Reducing Agent ◽  
Early Age ◽  
Initial Setting Time ◽  
Plastic Shrinkage ◽  
Different Temperatures ◽  
Expansive Additive ◽  
Hot Weather ◽  
Shrinkage Reducing Agent

In the construction, it is inevitable to perform plaster work in hot weather which causes the dehydration and rapid shrinkage on the paste during the early age. This research shows the studies of reducing the plastic shrinkage of mortar during the early age with such additives as the Shrinkage Reducing Agent (SRA), the Expansive Additive (EX), and the Fly Ash (FA) in controlled temperatures at 30°C and 40°C, with relative humidity between 60% and 70% according to the ASTM C1579-06 standard, with the strain gauge installed at 0.5 cm.from the surface. The shrinkage rate was measured starting from the Initial Setting Time and every 10 minutes afterwards for 24 hours. The results show that high temperature effects the cracking and how to use different formulas of additive under different circumstances is considerably important. To use only one additive is not sufficient in high temperature. To use the SRA in addition to the EX enhances better expansion than to use only the EX. Moreover, it is recommended to pay close attention in adding large amount of the FA into mortar with the EX and SRA added which extremely enhances the expansion and potential cracking.

scholarly journals Numerical simulation of early-age shrinkage effects on RC member deflections and cracking development

2016 ◽  
Vol 10 (37) ◽  
pp. 15-21 ◽  
Author(s):  
P. Bernardi ◽  
R. Cerioni ◽  
E. Michelini ◽  
A. Sirico
Keyword(s):  
Numerical Simulation ◽  
Early Age

Characteristics of Jointed Plain Concrete Pavement (JPCP) Built-in Temperature in Different Climate Conditions

2013 ◽  
Vol 723 ◽  
pp. 960-967
Author(s):  
Chang Bin Hu ◽  
Zeng Hua Sun ◽  
Li Juan Wang
Keyword(s):  
Numerical Simulation ◽  
Solar Radiation ◽  
Air Temperature ◽  
Temperature Difference ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Early Age ◽  
Climate Conditions ◽  
Solar Radiation Intensity ◽  
Basic Temperature

To understand the characteristics of early-age built-in temperature in JPCP, the actual data of construction climate conditions of typical regions in China were investigated. Based on the application of early-age JPCP temperature numerical simulation program, built-in temperature characteristics of early-age pavement in typical regions was analyzed. The results show that the pavement constructed in different climate conditions produce difference characteristics of early-age built-in temperature due to geographical distinction. Positive built-in temperature difference of JPCP is larger in the regions which have difference in temperature between day and night or higher solar radiation intensity, while the negative built-in temperature difference isn’t influenced obviously by different regions and paving conditions. The maximum positive (negative) built-in temperature difference generally appears in pavement constructed in hot summer. The air temperature is the major factor affecting built-in basic temperature. The higher air temperature, results in the higher built-in basic temperature (temperature in slab bottom) is.

Moisture Transport and Shrinkage in Concrete at early Age

2012 ◽  
Vol 174-177 ◽  
pp. 232-235 ◽  
Author(s):  
Ling Yun Meng
Keyword(s):  
Numerical Simulation ◽  
Stokes Equation ◽  
Lattice Gas ◽  
Environmental Scanning Electron Microscopy ◽  
Navier Stokes ◽  
Early Age ◽  
Weak Zone ◽  
Navier Stokes Equation ◽  
Moisture Flow ◽  
Lattice Gas Automata

Abstract: The moisture flow and drying of porous media, such as concrete, is tackled through the Navier-Stokes equation, where the Navier-Stokes equation is considered as the link between the theory of fluid flow, Acoustic Emission (AE) experiments on cracking (sound propagation based on the wave equation) and Lattice Gas Automata, (LGA) being a numerical simulation of the Navier-Stokes equation. Early age cracking in the ITZ is induced by using the moisture flow as the only “load” that causes cracking due to drying shrinkage volume changes in Environmental Scanning Electron Microscopy (ESEM) tests. An attempt is made to link and compare experimental results conducted by means of AE and ESEM to the results of 2-D LGA numerical simulation. Lattice Gas Automata (FHP model) is used as a basis to generate a new model for drying of porous medium. Special emphasis in a model creation is given to the Interface Transition Zone (ITZ), between aggregate and cement paste, because of the early crack initiation in this highly porous and strength-weak zone.

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