Prediction of Adiabatic Temperature Rise in Conventional and High-Performance Concretes Using a 3-D Microstructural Model

Bentz, Dale P.; Waller, Vincent; Larrard, F De

doi:10.1016/s0008-8846(97)00264-0

Cited by 108 publications

(61 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rate of hydration is faster for finer cement, higher initial temperature of mix and higher water/cement ratios (Bentz, 1998;De Schutter and Taerwe, 1995). These factors were not investigated in this project.…”

Section: Parameters Influencing Heat Evolution In Foamed Concretementioning

confidence: 99%

See 1 more Smart Citation

Heat evolution due to cement hydration in foamed concrete

Tarasov

Kearsley

Kolomatskiy

et al. 2010

Magazine of Concrete Research

View full text Add to dashboard Cite

Foamed concrete is nowadays considered an attractive building material as a result of flexible production technology and excellent target properties, along with economic benefits. Heat generated in foamed concrete during cement hydration is found to differ significantly from normal-weight concrete. Foamed concrete that is placed in a regular-shaped well-insulated mould experiences significant core temperature rises and, although several documents discussing the thermal effect in foamed concrete have been published, there is still a lack of information revealing the interrelations of foamed concrete parameters and their effect on temperature rise. Laboratory tests were carried out with foamed concrete of variable densities and volumes under semi-adiabatic curing conditions. The observed trends were used as the initial input for a mathematical model of temperature prediction in foamed concrete. The heat evolution process under real production conditions can be controlled by optimising the mix composition. If the thermal energy in foamed concrete is properly employed it can result in considerable improvement of the final product characteristics while production costs decrease.

show abstract

Section: Parameters Influencing Heat Evolution In Foamed Concretementioning

confidence: 99%

“…The values will change as water binds into hydrates having lower heat capacity values. The values are also prone to change as temperature increases with time owing to cement heat evolution (Bentz, 1998). These changes are complicated and warrant further investigations.…”

Section: Effect Of Density and Cube Size On Temperature Developmentmentioning

confidence: 99%

Heat evolution due to cement hydration in foamed concrete

Tarasov

Kearsley

Kolomatskiy

et al. 2010

Magazine of Concrete Research

View full text Add to dashboard Cite

show abstract

“…The type of cement, unit cement content, and initial temperature at casting are the main factors that affect the adiabatic temperature rise (Maekawa, 1999. ) An example of an adiabatic temperature rise graph can be seen in (Bentz, 1998).…”

Section: Measurement Of Temperaturementioning

confidence: 99%

“…Age conversion Factor versus temperature at various activation energies (Carino, 1991, p. 122 (Carino, 1991, p. 122 6.4. Adiabatic temperature curve for a concrete with w/c of 0.35 (Bentz, 1998) Joints are placed in portland cement concrete pavements (PCCP) as a method to control random cracking. These joints serve to provide a weakened plane, thereby enabling cracking to occur in a controlled manner at a specific location.…”

mentioning

confidence: 99%

Saw-Cutting Guidelines for Concrete Pavements: Examining the Requirements for Time and Depth of Saw-Cutting

Raoufi¹,

Their²,

Weiss³

et al. 2009

View full text Add to dashboard Cite

Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractJoints are placed in portland cement concrete pavements (PCCP) to control random cracking. These joints provide a weakened plane that enables a crack to form in a controlled manner, relieving residual stresses that develop when thermal, hygral, or hydration movements are resisted by subgrade and adjoining pavement. While the concept of creating a weakened plane through saw-cutting is straightforward, determining the time and depth of the saw-cut has proven to be complicated. The goal of this project was to reduce the risk for joint raveling and random cracking. Specifically, this project has focused on: developing a procedure for determining the appropriate saw-cutting time window for typical pavements constructed in the state of Indiana, determining the depth of the saw-cut that minimizes the risk of micro-cracking and random crack development, and developing tools and training materials for paving contractors and state inspectors that aid in implementing the findings of this study in concrete pavements.Toward this end the project was divided into three phases. The first phase of the project consisted of shadowing five pavement projects in Indiana. From these field investigations practical information was gained which was useful in developing the laboratory testing program. The second phase of this work involved in the development of the laboratory testing program. This phase in large part was involved in the development and commissioning of a new tensile wedge testing approach to determine the early age properties of concrete. Finally, finite element simulations were performed to simulate the early-age behavior of pavements constructed under a variety of saw-cutting sequences, environmental conditions. A strength reduction factor was computed based on the depth of the saw-cut. It was shown that the time of the saw-cut introduction needs to occur before the residual stress divided by the product of the strength reduction factor and tensile strength was equal to unity. It was also shown that shallower saw-cut depths were more prone to construction and material property variability. Recommendations are made to assist contractors in determining when saw-cuts are placed that can greatly improve field operations. Joints can be induced in early age concrete using several methods which include the use of hand-tools, preformed strips, and saw-cutting. While these three approaches are all valid, practical considerations for slip-form paving operations result in the nearly exclusive use of saw-cutting as the method of choice for inducing joints. Generally it is thought that three main methods of saw-cutting joints exist including conventional wetcut (water-injection) saws, conventional dry-cut saws, and the more recently developed early-entry dry-cut saws.While the concept of creating a weakened plane by saw-cutting may appear straightforward, determining the time and depth of the saw-cut has p...

show abstract

“…The ability to predict the expected temperature history would thus be useful to structural engineers and designers interested in producing a durable concrete structure. In the past, several researchers (Cook and Aitcin 1993, Wang and Dilger 1994, and Bentz et al 1998 have attempted to predict the temperature rise occurring in hardening concrete, but the focus of these models has been on following the relationships between hydration heat rate and concrete maturity function under adiabatic conditions. The models did not take into account the effect of the water-cement ratio (w/c) on hydration heat release.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Temperature and Moisture Distributions in Hardening Concrete By Using a Hydration Model

Park¹

2012

Architectural research

View full text Add to dashboard Cite

This paper presents an integrated procedure to predict the temperature and moisture distributions in hardening concrete considering the effects of temperature and aging. The degree of hydration is employed as a fundamental parameter to evaluate hydrothermal-mechanical properties of hardening concrete. The temperature history and temperature distribution in hardening concrete is evaluated by combining cement hydration model with three-dimensional finite element thermal analysis. On the other hand, the influences of both self-desiccation and moisture diffusion on variation of relative humidity are considered. The self-desiccation is evaluated by using a semi-empirical expression with desorption isotherm and degree of hydration. The moisture diffusivity is expressed as a function of degree of hydration and current relative humidity. The proposed procedure is verified with experimental results and can be used to evaluate the early-age crack of hardening concrete.

show abstract

Prediction of Adiabatic Temperature Rise in Conventional and High-Performance Concretes Using a 3-D Microstructural Model

Cited by 108 publications

References 9 publications

Heat evolution due to cement hydration in foamed concrete

Heat evolution due to cement hydration in foamed concrete

Saw-Cutting Guidelines for Concrete Pavements: Examining the Requirements for Time and Depth of Saw-Cutting

Prediction of Temperature and Moisture Distributions in Hardening Concrete By Using a Hydration Model

Contact Info

Product

Resources

About