Temperature reduction during concrete hydration in massive
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Temperature reduction during concrete hydration in massive .

Temperature reduction during concrete hydration in

2017-6-27  Ice can also be used to reduce the temperature at casting the concrete and reduce the amount of water that is needed in the mix. The main post-cooling method is cooling pipes, with cold water circulating in the pipes to cool the structure.

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Temperature reduction during concrete hydration in massive ...

Corpus ID: 202943691. Temperature reduction during concrete hydration in massive structures @inproceedings{Lagundzija2017TemperatureRD, title={Temperature reduction during concrete hydration in massive structures}, author={Sandra Lagundzija and M. Thiam}, year={2017} }

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Temperature reduction during concrete hydration in massive ...

However, cement which is one of the main components in concrete, produces a high amount of heat during the hydration process. The generated heat leads to temperature rise inside the structure. This temperature rise becomes an issue for massive concrete structures, such as hydropower plants and dams, since natural cooling is no longer sufficient.

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(PDF) Reducing temperature difference in mass concrete by ...

The reaction between water and cement in massive concrete structures like dams, pavements and piers produces heat and increases the temperature of the concrete [1, 2]. During the cement hydration ...

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A Study on the Reduction in Hydration Heat and Thermal ...

2020-7-6  However, the massive concrete specimens were not de-molded and were instead cured in the air at a room temperature of 20C and 60% RH for 28 days. During the curing period, the temperature and the strain due to the thermal expansion of concrete were measured by using thermocouples and gauges, as shown in Figure2. 3.

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Hydration and temperature development of concrete made ...

1999-1-1  In the hydration model, the heat production rate is calculated as a function of the degree of hydration and the temperature. The accuracy of temperature simulations using this new hydration model is evaluated by tests on hardening massive concrete cylinders made with blast-furnace slag cement.

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Temperature variation in concrete samples due to cement ...

2016-6-25  Large structures of massive concrete are an engineering problem due to cracking created by thermal stresses. Nowadays, many constructions use large amount of concrete, like dams, tall buildings and infrastructure solutions. In big concrete structures, the temperature gradient is mainly caused by cement hydration heat.

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Temperature variation in concrete samples due to cement ...

The reduction temperature of aggregate is necessary in production of high efficiency massive concrete structures. ... stress development during early-age hydration in concrete. The mesostructure ...

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Corrosion resistance and hydration heat of concrete ...

Massive concrete structures are vulnerable to thermal crack by hydration heat. In view of this, adiabatic temperature rising tests were carried out for different water-binder ratios (water to cement+GGBFS) of 43.2 per cent to 47.3 per cent, while replacing 15 per cent to 50 per cent of cement

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Cement Hydration - an overview ScienceDirect Topics

M.I. Sánchez de Rojas Gómez, M. Frías Rojas, in Eco-Efficient Concrete, 2013 4.4.1 Heat of hydration. Portland cement hydration reactions are so highly exothermal that they heat the cement paste. Heat develops rapidly during setting and initial hardening and gradually declines and finally stabilises as hydration

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Reduction of interior temperature of massive concrete ...

2021-2-3  The interior temperature of the massive concrete should be controlled to avoid cracks caused by the trapped hydration heat. In this paper, an enhanced heat transfer pipe array with spiral fins (PSF) is proposed to reduce the interior temperature of concrete blocks.

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A Study on the Reduction in Hydration Heat and Thermal ...

The reaction between water and cement in massive concrete structures like dams, pavements and piers produces heat and increases the temperature of the concrete [1,2].During the cement hydration, the internal part of the structure will reach a higher temperature than the surface, and excessive differences in the temperature may form cracks in the structure.

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Hydration and temperature development of concrete made ...

1999-1-1  In Europe, massive concrete elements often are made with blast-furnace slag cements. To better deal with the problem of early-age thermal cracking in these cases, a new hydration model for blast-furnace slag cements is developed, which is based on isothermal and adiabatic hydration tests.

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(PDF) Hardening retarders for massive concrete

Synopsis: The heat of hydration in massive concrete structures can raise the temperature to a level where thermal cracks can pose a problem. Hardening retarders are admixtures that lower the rate ...

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Influence of Casting Temperature on the Heat of Hydration ...

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 ...

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Methods of Limiting Temperature of Concrete - Structural

2021-8-12  Control the Rise of Temperature in Immature Concrete. Reduce the rise of the temperature in the hydration process due to the higher cement content. Replacement material such as fly ash could be used to control the content of cement as a temperature reducer. Select the gradation of

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CONCRETE TEMPERATURES, A REVIEW OF

2018-11-5  The temperature of concrete during the hardening process is critical to the performance of the concrete. The primary source of temperature rise in concrete is hydration of the cement which produces heat. The other primary source of heat that directly effects the maximum temperature in concrete is the ambient temperature of the fresh concrete.

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Properties of adiabatic temperature rise on concrete ...

2016-7-20  temperature on the hydration temperature, the adiabatic temperature test of concrete was carried out setting the placing temperature and the initial curing temperature to 25ºC and 35ºC, respectively. In addition, the relation between the starting time of hydration

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Portland Cement, Concrete, Volume 18/Number 2 and

2021-3-1  The heat generated by the cement’s hydration raises the temperature of concrete. During normal concrete construc-tion, the heat is dissipated into the soil or the air and resulting tempera-ture changes within the structure are not significant. However, in some situations, particularly in massive structures, such as dams, mat foun-

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(PDF) Evaluation of Temperature Prediction Methods for ...

temperature, as 12 °C (21.6 °F) for every 100 kg (220.4 lb) of cement. The PCA Method is only appropriate for concrete. containing between 300 and 600 kg of cement per cubic. meter (506 and 1012 ...

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Portland Cement, Concrete, Volume 18/Number 2 and

2021-3-1  The heat generated by the cement’s hydration raises the temperature of concrete. During normal concrete construc-tion, the heat is dissipated into the soil or the air and resulting tempera-ture changes within the structure are not significant. However, in some situations, particularly in massive structures, such as dams, mat foun-

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Temperature Management of Mass Concrete Structures ...

2006-11-2  Many mass concrete projects specify a 35° F maximum temperature differential, and some limit the maximum internal temperature (usually 160°F). Contractors and engineers on these projects are increasingly called upon to develop a temperature

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EFFECT OF TEMPERATURE UPON THE STRENGTH

2010-11-10  (reduction of clinker part in cement) and technical requirements (low hydration heat, durability of concrete, sulphate resistance etc.) [6]. The massive use of these cements has encountered some practical problems due to the influence of climatic ups downs. The main factors influencing the properties of cement pastes or concretes

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Concrete Temperature Monitoring in Mass Concrete

2021-5-10  The Temperature Monitoring Process. The initial process for heat monitoring of concrete mixtures is based on predictions made by taking into account the design of the concrete mix, the shape of the project, the ambient temperature, and more. Once the concrete is in place, temperature monitoring sensors and thermocouples are used to report on ...

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Study of Development of Hydrating Temperatures and ...

One of the main characteristics in the concreting of massive waterproof structures and dam bodies is the prediction of crack formation. This prediction is associated with an understanding of the mechanics of development of hydration temperatures that affect in particular the selected binder parts of concrete. A suitable combination of cement with mineral admixtures, as well as the use of so ...

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How to avoid high temperature problems in concrete?

2015-6-4  1) Adding ice cubes and ice flakes to the water tanks in the batch plant. 2) Pour the concrete during the low weather temperature of the day (evening and/or Early morning time). 3) Keep the fine and course aggregates shaded in the batch plant. 4) Apply wet curing for the concrete

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Calcium-Silicate-Hydrate (C-S-H) Concrete Sustainability Hub

Concrete sustainability begins at the most fundamental level: understanding the molecular structure of cement paste—calcium-silicate-hydrate (C-S-H), the main product of the hydration of portland cement and the primarily responsible for strength in cement-based materials. News. MIT News: Visualizing cement hydration on a molecular level (June 2021) ...

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Investigation of Physical Properties of Graphene-Cement ...

2014-1-7  tion, water to cement ratio and curing temperature. Due to the exothermic nature of the reaction combined with poor heat dissipation in massive concrete elements, the hydration process results in a temperature gradient be- tween the inner core and the outer surface of the element [4]. The high temperature gradient is known to result in

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STRUCTURE magazine Mass Concreting

Admixtures used for air entrainment, water reduction, set time, and shrinkage reduction, strength, and durability can be adjusted to slow or reduce the heat of hydration. Monitoring Concrete Temperatures. The monitoring of concrete temperatures in mass

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Effects of curing temperature and superabsorbent polymers ...

2019-10-15  The early-age shrinkage can easily result in crack of concrete in the early age, which seriously affects the durability of concrete. The CaO-based expansion additive is a normally used and effective material for the shrinkage compensation and the reduction of early-age crack risk in concrete. The hydration is a factor that significantly influences the mechanical and durability properties of ...

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