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Modern concrete construction involves the use of a variety of special concretes. While the design of such concretes accounts for the achievement of characteristics such as high strength, toughness, flowability, shrinkage compensation and so on, one aspect that is not sufficiently addressed is the heat evolution in such concretes. This can be of par...
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... full description of the working of the adiabatic system, along with the conversion of the temperature profiles into the heat evolution curves, is presented by Prasath and Santhanam (2013). The output is described by a temperature profile, and a typical heat evolution curve generated for the system is shown in Figure 2. ...
Citations
... Numerous studies have attempted to predict adiabatic temperature evolution using isothermal, semi-adiabatic, and numerical tests [2,3,[17][18][19]. In turn, calorimetric tests on concrete cured under adiabatic conditions has been limited to prototypes designed in research centers [20,21]. In a paper by [21], the own concrete adiabatic calorimeter was developed. ...
This paper presents experimental and numerical studies investigating the impact of three curing conditions on temperature evolution in concrete cubes. The tests were performed on samples of the same volume (3.375 dm ³ ) under different curing conditions: room temperature, insulation boxes, and adiabatic calorimeter. Various cements (Portland cement, Portland composite cement, and blast furnace slag cement) and aggregates (gravel and basalt) were examined. The temperature evolution for all mixtures was analyzed, revealing a correlation between temperature increase and concrete type. Under insulation and adiabatic curing, Portland cement with gravel aggregate exhibited the highest temperature rise, while blast furnace slag cement with basalt aggregate showed the lowest increase. The incorporation of slag, ash, or other mineral additives reduced temperature rise. Additionally, basalt aggregate’s higher heat capacity and thermal energy accumulation led to a decreased temperature increase compared to gravel. Using recorded thermal data, a numerical procedure predicting temperature development in nonadiabatic conditions through direct adiabatic tests is proposed. Comparisons between experimental and numerical temperature evolutions confirmed the model’s accuracy.
... Likewise, it was implemented the calorimeter designed to perform heat of hydration measurements on cement paste samples. The novelty of this work is to display that the calorimeter was developed using concurrent design (optimization algorithms) unlike existing calorimeters implemented [13][14][15][16]. It is expected that this work will be one of the first to develop optimized calorimeters for cement mixtures [17]. ...
This study aims to design an adiabatic calorimeter for cementitious mixtures using NSGA-II and the Pareto optimal solution set. In this multi-objective optimization, the controller effort and heating time are selected as objective functions. Likewise, the volume and the material to be heated were chosen as decision variables. The optimal solution was selected using Nash bargaining methods. After implementing the optimal solution, the Wilcoxon test was applied to statistically validate the developed work. The measurements performed were compared with other research and it was observed an improvement in the measurement of heat of hydration in cementitious mixtures. Also, it was noted a decrease in the error in the temperature measurement.
... The authors have produced some useful experimental data on the heat evolution of concrete mixes containing different mineral admixtures (Ramu et al., 2016). These data may be further analysed for deeper study. ...
