scholarly journals A CASE STUDY ON MEASUREMENT OF TEMPERATURE RISE IN CONCRETE AND ASSESSMENT OF PROBABILITY OF CRACKING DUE TO HEAT OF HYDRATION

2018 ◽  
Vol 07 (13) ◽  
pp. 11-19
Author(s):  
K.C.Tayade . ◽  
Sandip Sonule . ◽  
Kunwar Sushil Kumar . ◽  
Mahesh kumar .
Keyword(s):  
Temperature Rise ◽  
Heat Of Hydration

scholarly journals Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1847 ◽  
Author(s):  
Hoon Moon ◽  
Sivakumar Ramanathan ◽  
Prannoy Suraneni ◽  
Chang-Seon Shon ◽  
Chang-Joon Lee ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Temperature Rise ◽  
Adiabatic Calorimetry ◽  
Blast Furnace Slag ◽  
Isothermal Calorimetry ◽  
Heat Of Hydration ◽  
Supplementary Cementitious Materials ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Furnace Slag

Blast furnace slag (SL) is an amorphous calcium aluminosilicate material that exhibits both pozzolanic and latent hydraulic activities. It has been successfully used to reduce the heat of hydration in mass concrete. However, SL currently available in the market generally experiences pre-treatment to increase its reactivity to be closer to that of portland cement. Therefore, using such pre-treated SL may not be applicable for reducing the heat of hydration in mass concrete. In this work, the adiabatic and semi-adiabatic temperature rise of concretes with 20% and 40% SL (mass replacement of cement) containing calcium sulfate were investigated. Isothermal calorimetry and thermal analysis (TGA) were used to study the hydration kinetics of cement paste at 23 and 50 °C. Results were compared with those with control cement and 20% replacements of silica fume, fly ash, and metakaolin. Results obtained from adiabatic calorimetry and isothermal calorimetry testing showed that the concrete with SL had somewhat higher maximum temperature rise and heat release compared to other materials, regardless of SL replacement levels. However, there was a delay in time to reach maximum temperature with increasing SL replacement level. At 50 °C, a significant acceleration was observed for SL, which is more likely related to the pozzolanic reaction than the hydraulic reaction. Semi-adiabatic calorimetry did not show a greater temperature rise for the SL compared to other materials; the differences in results between semi-adiabatic and adiabatic calorimetry are important and should be noted. Based on these results, it is concluded that the use of blast furnace slag should be carefully considered if used for mass concrete applications.

scholarly journals Strength Development and Thermogravimetric Investigation of High-Volume Fly Ash Binders

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3344 ◽  
Author(s):  
Zhiyuan Zhou ◽  
Massoud Sofi ◽  
Elisa Lumantarna ◽  
Rackel San Nicolas ◽  
Gideon Hadi Kusuma ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Temperature Rise ◽  
Bound Water ◽  
High Volume ◽  
Heat Of Hydration ◽  
New Method ◽  
Hydration Properties ◽  
Adiabatic Temperature Rise ◽  
High Volume Fly Ash

To address sustainability issues by facilitating the use of high-volume fly ash (HVFA) concrete in industry, this paper investigates the early age hydration properties of HVFA binders in concrete and the correlation between hydration properties and compressive strengths of the cement pastes. A new method of calculating the chemically bound water of HVFA binders was used and validated. Fly ash (FA) types used in this study were sourced from Indonesia and Australia for comparison. The water to binder (w/b) ratio was 0.4 and FA replacement levels were 40%, 50% and 60% by weight. Isothermal calorimetry tests were conducted to study the heat of hydration which was further converted to the adiabatic temperature rise. Thermo-gravimetric analysis (TGA) was employed to explore the chemically bound water (WB) of the binders. The results showed that Australian FA pastes had higher heat of hydration, adiabatic temperature rise, WB and compressive strength compared to Indonesian FA pastes. The new method of calculating chemically bound water can be successfully applied to HVFA binders. Linear correlation could be found between the WB and compressive strength.

Modeling the Heat of Hydration of Concrete Incorporating Fly Ash

2016 ◽  
Vol 705 ◽  
pp. 332-337 ◽  
Author(s):  
Zheng Gang Lu ◽  
Xiu Xin Wang
Keyword(s):  
Fly Ash ◽  
Temperature Rise ◽  
Heat Of Hydration ◽  
Hyperbolic Type ◽  
Adiabatic Temperature ◽  
Adiabatic Temperature Rise ◽  
Equivalent Age ◽  
Binder Ratio ◽  
Water Binder Ratio ◽  
Release Coefficient

The hydration evolution of concrete with different water-binder ratios and fly ash replacement percentages are studied by experimental investigation. Based on equivalent age concept, the effect of water-binder ratio as well as fly ash dosage on the ultimate temperature rise and heat release coefficient are analyzed with the hyperbolic-type calculating model of adiabatic temperature rise adopted. It is indicated that the adiabatic temperature rise will be reduced with the increase of water-binder ratio and the incorporation of fly ash. The hydration evolution process will be accelerated with the decrease of water-binder ratio, but slowed down when the amount of fly ash is enhanced.

Influence of Casting Temperature on the Heat of Hydration in Mass Concrete Foundation with Ternary Cements

2014 ◽  
Vol 525 ◽  
pp. 478-481 ◽  
Author(s):  
Mi Hwa Lee ◽  
Young Seok Chae ◽  
Bae Su Khil ◽  
Hyun Do Yun
Keyword(s):  
Temperature Rise ◽  
Heat Of Hydration ◽  
Adiabatic Temperature ◽  
Casting Temperature ◽  
Mass Concrete ◽  
External Temperature ◽  
Maximum Heat ◽  
Adiabatic Temperature Rise ◽  
Concrete Foundation ◽  
Mat Foundation

This study is conducted to evaluate analytically the effect of casting temperature on the heat of hydration in mass concrete foundation with ternary cements and Type IV low heat cement. The mat foundation has the dimension of 15m length, 20m width and 3m depth. Casting temperatures considered for mat foundation consist of 10, 20 and 30C ̊. A commercial software MIDAS/Gen was used to analyze the hydration heat of mass concrete foundation. The maximum adiabatic temperature rise (K), and the coefficient of temperature rise˰˸α˹˰for thermal analysis were drawn from adiabatic temperature rise test. Analytical results show that blended cement PSLB_352 is the most effective to control the heat of hydration in mass concrete foundation and external temperature increases the maximum heat of hydration and crack probability of mat foundation with mass concrete.

scholarly journals Environmental effects of temperature rise and long periods without precipitation on soil processes – case study for southern Slovakia

2018 ◽  
Vol 50 (3) ◽  
pp. 273-287
Author(s):  
Luboš Jurík ◽  
Peter Halaj ◽  
Tatiana Kaletová ◽  
Józef Mosiej ◽  
Jozefína Pokrývková ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Environmental Effects ◽  
Temperature Rise ◽  
Extended Period ◽  
River Basin Management ◽  
Soil Processes ◽  
Soil Water Retention ◽  
Effects Of Temperature

Abstract Environmental effects of temperature rise and long periods without precipitation on soil processes - case study for southern Slovakia. The general purpose of the article is to evaluate the environmental effects of temperature rise and long periods without precipitation on soil processes in southern Slovakia. Observed climate change (increase in average temperature) can cause changes in the fertility of the soil, especially in the direction of faster mineralization of organic matter. As an example, very accurate measurements of air temperature, rainfall and water content in the soil profile to a depth of 1 m are used. The more specific objective of the study was to evaluate the formation of soil water retention resources under high temperature conditions and over 30 days without rainfall. Based on the measured values, they were created graphs for extended period of time without precipitation. The graph shows the average daily soil moisture in each layer, which is measured at the hydrological network of stations in operation by Centre of Excellence for Integrated River Basin Management at SUA in Nitra. The final evaluation for the stations Žirany and Dolné Naštice, soil water content is showing the vulnerability of crops due to changes in water content, especially in layers from 0.3 to 0.5 m.

On investigations of the observed thermal anomaly in earthquake precursors: A case study from the 1993 Latur earthquake prone area in western India

2020 ◽  
Author(s):  
Vijay P Dimri ◽  
Simanchal Padhy ◽  
N C Mondal ◽  
G K Reddy ◽  
G G. Ramacharyulu ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Seismic Hazard Assessment ◽  
Thermal Anomaly ◽  
Atmospheric Temperature ◽  
Research Area ◽  
Western India ◽  
Monsoon Period ◽  
Helium Gas ◽  
Prone Area

Abstract We report and discuss monitoring of short-term variations of widely used multi-geophysical parameters in Latur-Killari area in western India, the region that faced a major devastating earthquake in 1993. An abnormal rise in atmospheric temperature of more than 20 ° C at 11200 m height was observed in the air-flight just 100 km away from Latur during a monsoon period. To investigate the causes of such temperature rise, we studied seismicity of the area in relation to the 1993 Latur event, and continuously monitored ground-water level and soil Helium gas for one week immediately following this observation under a precursory ‘quick please’ operation in the study area. There are no precursory seismic signals associated with this temperature rise; hence the operation was suspended after one week time. Although this thermal anomaly is not followed by any major earthquake over the area, it has larger implications in atmosphere research area. While a detailed investigation of such anomaly is beyond the scope this paper, we report here the possibility that the satellite thermal sensor cannot penetrate thick clouds to accurately retrieve the temperature. We are cautious of arriving at a firm conclusion, but the findings of this study certainly call for continuous monitoring of temperature over the earthquake prone areas to gain insight into the physics of short-lived variation in temperature over spatially limited extent, especially over the earthquake prone areas for improved seismic hazard assessment.

scholarly journals Simulation as a decision tool in construction process management in turbulent environment

2018 ◽  
Vol 222 ◽  
pp. 01007
Author(s):  
Kinga Katafoni ◽  
Jerzy Paslawski
Keyword(s):  
Process Management ◽  
Traditional Approach ◽  
Heat Of Hydration ◽  
Construction Process ◽  
Decision Tool ◽  
Critical Problem ◽  
Concrete Element ◽  
Entire Structure ◽  
Pessimistic Scenario

This paper is dedicated to simulation idea of construction process for decision-making aid. An aim is to improve technological decisions for concreting operation at low temperature. A risk of destruction of concrete structure is a critical problem in this situation. A sudden drop in temperature may result in disqualification of the concrete element or the entire structure. The proposed solution is based on a simulation of the process of maturing of the concrete element based on experiments in the laboratory (e.g. heat of hydration and dynamics of growth of compressive strength depending on the temperature). The case study proved that the traditional approach to the management of concreting technology (based on one 48-hour forecast) is extremely risky when operating in a turbulent and changing environment. The proposed flexible approach is based on systematically updated simulation and is more effective thanks to the possibility of activating active flexible procedures to prevent freezing of concrete in case of pessimistic scenario.

Thermal Characteristics of Mat Foundation with Different Lift Thickness of Mass Concrete Including Strontium-Based Latent Heat Binder

2014 ◽  
Vol 525 ◽  
pp. 461-464
Author(s):  
Kyung Lim Ahn ◽  
Qi Bo Liang ◽  
Bae Su Khil ◽  
Hyun Do Yun
Keyword(s):  
Latent Heat ◽  
Temperature Rise ◽  
Volume Fraction ◽  
Heat Of Hydration ◽  
Adiabatic Temperature ◽  
Hydration Heat ◽  
Mass Concrete ◽  
Adiabatic Temperature Rise ◽  
Concrete Foundation ◽  
Mat Foundation

This study provides analytical results for heat of hydration in the mat foundation with mass concretes to investigate the effect of lift thickness in the mat foundation on the hydration heat and crack characteristics of mat foundation with mass concrete. Mass concretes were mixed with ternary cement with 1% strontium-based latent heat binder at volume fraction and Type IV low heat cement. The mat foundation has the dimension of 15m length, 20m width and 3m depth. Lift thickness of mass concrete for mat foundation was varied from 1.0m to 3.0m. A commercial software MIDAS/Gen was used to analyze the hydration heat of mass concrete foundation. The maximum adiabatic temperature rise (K), and the coefficient of temperature rise (α) for thermal analysis were drawn from adiabatic temperature rise test. Based on the results of the finite element analysis for mat foundation with different lift thickness, the highest internal temperature and thermal stress increased with increasing with lift thickness of foundation. However, for foundation constructed with premixed strontium based latent heat binder (PSLB) concrete, this phenomenon was less remarkable compared to mass concrete foundation made with low heat cement.

A back to back method for the temperature rise test of prefabricated substations: A case study

2015 ◽  
Author(s):  
Giovanni Cangemi ◽  
Giovanni Cipriani ◽  
Vincenzo Di Dio ◽  
Rosario Miceli ◽  
Salvatore Nuccio ◽  
...  
Keyword(s):  
Temperature Rise
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