Monitoring of Concrete Hydration Using Resin Jacketed Embedded PZT Sensors

In this paper, the author simulates geological conditions of permafrost areas, establi-shes CFG group piles indoor model, observes the pile and frozen soil temperature field, then compares the calculated results of the group piles and frozen soil temperatures under concrete hydration heat effect by using ABAQUS with the measured temperature data, thus determines the applicability of ABAQUS for analysis of CFG group piles temperature in permafrost areas, in order to analyze temperature distribution regularities of group piles and frozen soil under concrete hydration heat effect, thermal perturbation range of CFG group piles in permafrost areas, and effects of different concrete molding temperature on model temperature field.

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Possibilities of Regulation of Temperature in Concrete during Hydration by Means of Selection of Suitable Input Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.507.199 ◽

2014 ◽

Vol 507 ◽

pp. 199-203 ◽

Cited By ~ 1

Author(s):

Rudolf Hela ◽

Jiri Zach ◽

Martin Sedlmajer

Keyword(s):

Blast Furnace ◽

Portland Cement ◽

Blast Furnace Slag ◽

Hydration Heat ◽

Concrete Hydration ◽

Furnace Slag ◽

Selection Of

Paper is focused on development of hydration heat in concrete in time. Possible ways of reduction of temperature during concrete hydration are mentioned. Paper presents study of possibilities of regulation temperature in concrete during hydration by selection of suitable input components. Blast furnace slag and micronized limestone were added to pure Portland cement; several variants of proportions were proposed.

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The Hydration Heat Analysis for Sealing Concrete of Swivel Construction Open Thin Wall Arch

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.253-255.440 ◽

2012 ◽

Vol 253-255 ◽

pp. 440-444

Author(s):

Xiong Hui Feng ◽

Zi Qiang Zhu ◽

Zhi Yong Li ◽

Xin Wu

Keyword(s):

Simulation Model ◽

Heat Effect ◽

Hydration Heat ◽

Thin Wall ◽

Arch Bridge ◽

Boundary Constraint ◽

Constant Coefficients ◽

Complex Boundary ◽

Concrete Hydration ◽

Simulation Parameters

The sealing concrete of arch bridge will be constructed after swivel construction of it finished. The concrete has such characteristics like huge size, smaller heat radiating area and more complex boundary constraint. According to the cracking situation of this type bridges in recent years, the paper established hydration heat simulation model of it using MIDAS2010 program and numerical analyzed for the model. The hydration heat constant coefficients and placing temperature of the concrete hydration heat effect have been analyzed by simulation parameters base on that. And the results showed that it is an important reason causing the cracking of the concrete.

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Fly Ash-Desulfurization Gypsum Mortar and Concrete Part I: Mix Proportions and Hydration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.809 ◽

2011 ◽

Vol 250-253 ◽

pp. 809-816

Author(s):

Yu Chen ◽

Ying Li Gao

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Hydration Process ◽

Cement Stone ◽

Composite Binder ◽

Strength Concrete ◽

Concrete Hydration ◽

Concrete Part ◽

Flue Gas Desulphurization

Fly ash (FA) and flue gas desulphurization gypsum (FGD) were blended in proportion into a new composite binder added with cement, lime and some modifiers. In the paper, the mix proportions of composite binder with low-quality FA and FGD were studied. FA-FGD more than 80% with FA:FGD 3:2 was suggested for mortar, plastering and slurry while FA:FGD 2:1 and FA-FGD 30~40% was recommended for middle-strength concrete. Hydration process of typical mixtures of FA-FGD paste was investigated through SEM and XRD tests. The conclusion could be made that FA showed much improved pozzolana activity especially at early ages due to the existence of FGD as an ideal sulfate activator, which also crystallized later to strengthen the hardened paste. The microstructure of hydrated FA-FGD paste was more excellent than that of neat cement stone or one blended with the same percentage of pure FA.

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Tracing of Concrete Hydration by Means of Impedance Spectroscopy (New Tool for Building Elements Testing)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.248.370 ◽

2012 ◽

Vol 248 ◽

pp. 370-378 ◽

Cited By ~ 27

Author(s):

Ivo Kusak ◽

Miroslav Lunak ◽

Pavel Schauer

Keyword(s):

Impedance Spectroscopy ◽

Setting Time ◽

Non Destructive Testing ◽

Destructive Testing ◽

Testing Method ◽

Specimen Quality ◽

Concrete Hydration ◽

Tan Δ ◽

Non Destructive ◽

Method Group

Concrete setting and hardening designate the concrete grade. The impedance spectroscopy method, as one of the non-destructive testing method group, was used to characterize concrete specimens and track the changes in the concrete spectrum. Variances in the tan δ (f) and Im Z(f) or Re Z(f) of the specimens under investigation have been observed. The specimen quality has been described by means of the loss type prevailing in the material. The results of this study are expected to provide information about the correlation between the n-factor and the concrete setting time.

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Discrete Optimization of Software-Controlled Modes of Heat Treatment of Concrete Products in Heat-Technological Facilities

ENERGETIKA Proceedings of CIS higher education institutions and power engineering associations ◽

10.21122/1029-7448-2019-62-3-280-292 ◽

2019 ◽

Vol 62 (3) ◽

pp. 280-292

Author(s):

A. M. Niyakovskii ◽

V. N. Romaniuk ◽

Yu. V. Yatskevich ◽

A. N. Chichko

Keyword(s):

Heat Treatment ◽

Heat Supply ◽

Time Lag ◽

Hydration Process ◽

Temperature Fields ◽

Maximum Speed ◽

Functional Dependencies ◽

Industrial Facilities ◽

Degree Of Hydration ◽

Concrete Hydration

In the article the technique of an assessment of modes of operation of the heat engineering equipment used for heat treatment of concrete products in the conditions of programcontrolled heat supply according to the pattern of “heating – isothermal influence – cooling” has been developed. The method is based on the numerical solution of a non-stationary heat equation supplemented by equations describing the hydration process of a concrete product; also, it includes a system of initial and boundary conditions for its spatial structure. The method makes it possible to create tabulated functions of temperature and the degree of hydration of the time of heat treatment in any point of a 3D-product. The mathematical tools for calculating the functional dependencies of concrete hydration equipment with software-heated environment are presented. Numerical calculations of the concrete hydration process in the formwork are performed with respect to the symmetrical object. Based on the calculation of the temperature gradient across the minimal cross section of the product, a numerical analysis of the functions modeling heat supply mode depending on the processing time of a concrete product has been fulfilled. It is demonstrated that the maximum speed of the hydration process in a concrete product hardening is achieved at the maximum of time lag of isothermal cure. Additionally, with an increase in the duration of the product heating, the value of the maximum hydration rate decreases. It is concluded that the method of assessing the mode of heat treatment of concrete products being developed makes it possible to determine parameters for the calculation of the minimal useful heat required for the heat treatment of concrete products with spatially distributed parameters. The proposed method is applicable to calculate the temperature fields and the extent of hydration in the products of any geometric shape and volume in a software-controlled heating environment of industrial facilities for the accelerated hydration of concrete, and also affords the possibility of preliminary calibration prior to the assignment of relevant heat supply modes to the products being processed.

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