dielectric properties of portland cement concrete at low
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Dielectric Properties of Portland Cement Concrete at Low ...

This paper presents a nondestructive evaluation method to characterize portland cement concrete (PCC) based on its dielectric properties. The work reported is part of an ongoing study to develop a nondestructive evaluation method for PCC structures using electromagnetic waves.

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DIELECTRIC PROPERTIES OF PORTLAND CEMENT

DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE AT LOW RADIO FREQUENCIES. A nondestructive evaluation technique is presented to characterize portland cement concrete (PCC) based on its dielectric properties. The work presented is part of an ongoing study to develop a nondestructive evaluation method for PCC structures using electromagnetic waves.

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DIELECTRIC PROPERTIES OF PORTLAND CEMENT

DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE AT Low RADIO FREQUENCIES By I. L. AI-Qadi; Member, ASCE, O. A. Hazim, 2 W. Su,3 and S. M. Riad4 ABSTRACT: This paper presents a nondestructive evaluation method to characteri.ze portland cement concrete (PCC) based on its dielectric properties.

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Dielectric properties of portland cement concrete at low ...

T1 - Dielectric properties of portland cement concrete at low radio frequencies. AU - Al-Qadi, I. L. AU - Hazim, O. A. AU - Su, W. AU - Riad, S. M. PY - 1995/8. Y1 - 1995/8. N2 - This paper presents a nondestructive evaluation method to characterize portland cement concrete (PCC) based on

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Measuring dielectric properties of concrete over low RF ...

Parallel plate capacitor was designed and manufactured to measure the dielectric properties of portland cement concrete (PCC) at low radio frequency (RF), 0.1 MHz to 40.1 MHz. The setup consists of a parallel plate capacitor fixture, a network analyzer, and connecting cable and adapters. The impedance of the capacitor was measured using an HP ...

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Permittivity of Portland cement concrete at low RF ...

1994-4-1  The selected mixes included three water-to-cement (w/c) ratios, two aggregate types, and two levels of entrained air content; Type 1 portland cement was used. Preliminary measurements showed that the dielectric constant of the concrete specimens varied over frequency from nearly 150 at 1 MHz to around 6 at 40 MHz after 28 days of moist curing.

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EFFECT OF ADMIXTURES, CHLORIDES, AND MOISTURE

2020-9-28  DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE IN THE LOW MICROWAVE FREQUENCY RANGE By Kiran Pokkuluri Thesis submitted to the Faculty of the Virginia Polytechnic Institute and State University In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE In Civil Engineering APPROVED Dr. Imad L. Al- Qadi, Chairman

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Electrical properties of fluidified Portland cement mixes ...

2000-6-1  Dielectric properties of portland cement concrete at low radio frequencies J Mater Civ Eng , 7 ( 3 ) ( 1995 ) , pp. 192 - 198 CrossRef View Record in Scopus Google Scholar

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Concrete dielectric properties investigation using ...

2012-7-3  The paper deals with dielectric properties of concrete and the effect of frequency, curing time and water to cement (w/c) ratio, concrete compression strength, steel fibre concrete and moisture content on the dielectric properties. The concrete dielectric properties such as transmission coefficients, reflection coefficients, dielectric constants and loss factors; were investigated using ...

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Measurement of Complex Permittivity of Large Concrete ...

2015-3-4  A measurement is performed on a concrete sample with the following initial volume content: 11 % of Portland cement, 82 % of sand and small gravel (0 to 4 mm diameter) and 7 % of water. At t=0, the water content and the relative permittivity are maximal. The decrease of ε' as the hydration and curing process progresses is shown in the Fig. 9.

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EFFECT OF ADMIXTURES, CHLORIDES, AND MOISTURE

2020-9-28  DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE IN THE LOW MICROWAVE FREQUENCY RANGE By Kiran Pokkuluri Thesis submitted to the Faculty of the Virginia Polytechnic Institute and State University In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE In Civil Engineering APPROVED Dr. Imad L. Al- Qadi, Chairman

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Dielectric properties of portland cement paste as a ...

1998-8-17  The dielectric properties of portland cement paste and mortar have been measured in the frequency range 100 Hz–7 MHz as a function of time since mixing. Over much of the spectrum, the ac conductance of the samples appears directly related to

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Dielectric deamplification of multiphase cementitious ...

Dielectric properties (dielectric constant and loss factor) of hydrated cementitious composites (e.g., Portland ce- ment paste and concrete) are the basis for the use of microwave and radar ...

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Dielectric Permittivity of Various Cement-Based Materials ...

2014-6-19  The dielectric permittivity of cementitious materials during 24 hours hydration period at a frequency of 2.45 GHz using a network analyzer with open-ended probe technique was measured. Influences of water-to-cementitious ratios, cement types,

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THE MEASUREMENT OF THE DIELECTRIC CONSTANT OF

2018-9-14  There are certain concrete properties that influence the performance of concrete blocks. These properties include concrete compressive strength, density, absorption, water cement ratio, cement content and type, and aggregates. All of these factors would have an influence on the dielectric properties of concrete blocks. For example, the dielectric

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Dielectric Characterization of Chinese Standard Concrete ...

Dielectric characterization of concrete is essential for the wireless structural health monitoring (SHM) of concrete structures. Guo Biao (GB) concrete refers to the concrete mixed and cast in accordance with the Chinese standard. Currently, China is the largest producer and consumer of concrete in the world. However, minimal attention has been paid to the dielectric properties of GB concrete.

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Effect of Chlorides on Conductivity and Dielectric ...

2016-5-24  Dielectric constant and conductivity, the so-called EM properties (electromagnetic), are widely adopted for NDT (Nondestructive Technique) in order to detect damage or evaluate performance of concrete without damage to existing RC (reinforced concrete). Among deteriorating agents, chloride ion is considered as one of the most critical threats due to rapid penetration and direct effect on steel ...

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(PDF) Dielectric Properties of Cement Mortar as a Function ...

Abstract. We have studied the dielectric properties of cement mortars, with water/cement ratios between 0.5 and 0.78, in the frequency range 10-3≤f≤107 Hz. The dielectric ...

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Low Heat Cement - Cement Australia

2018-9-6  Portland cement: Amorphous silica. • Other cements complying with AS3972 - Portland and blended cements. Caution: Low Heat Cement must not be mixed with high alumina cement as this may result in uncontrollable expansion and setting times. Concrete Properties Concrete Compressive Strength Development Strength development in Portland cement ...

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U of T Engineering professor on a mission to lower ...

2021-10-18  Through the NSERC/Cement Association of Canada Industrial Research Chair in Concrete Durability and Sustainability, Hooton initiated a field trial that has been running for 11 years. His team cast more than 1,000 beams of concrete – some made with traditional Portland cement and others made with Portland-limestone cement.

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Dielectric properties of portland cement paste as a ...

1998-8-17  The dielectric properties of portland cement paste and mortar have been measured in the frequency range 100 Hz–7 MHz as a function of time since mixing. Over much of the spectrum, the ac conductance of the samples appears directly related to

Get Price

THE MEASUREMENT OF THE DIELECTRIC CONSTANT OF

2018-9-14  There are certain concrete properties that influence the performance of concrete blocks. These properties include concrete compressive strength, density, absorption, water cement ratio, cement content and type, and aggregates. All of these factors would have an influence on the dielectric properties of concrete blocks. For example, the dielectric

Get Price

Dielectric Permittivity of Various Cement-Based Materials ...

2014-6-19  The dielectric permittivity of cementitious materials during 24 hours hydration period at a frequency of 2.45 GHz using a network analyzer with open-ended probe technique was measured. Influences of water-to-cementitious ratios, cement types,

Get Price

Dielectric Characterization of Chinese Standard Concrete ...

Dielectric characterization of concrete is essential for the wireless structural health monitoring (SHM) of concrete structures. Guo Biao (GB) concrete refers to the concrete mixed and cast in accordance with the Chinese standard. Currently, China is the largest producer and consumer of concrete in the world. However, minimal attention has been paid to the dielectric properties of GB concrete.

Get Price

Development of a Portland Cement Concrete of High ...

2017-8-16  The actual dielectric strength of Portland cement concrete, usirg nonnal fine aggregate, is a matter of speculation to many engineers in the field. The opinions vary as widely as the experiences and contacts with the material. There are no standards, either

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Low Heat Cement - Cement Australia

2018-9-6  Portland cement: Amorphous silica. • Other cements complying with AS3972 - Portland and blended cements. Caution: Low Heat Cement must not be mixed with high alumina cement as this may result in uncontrollable expansion and setting times. Concrete Properties Concrete Compressive Strength Development Strength development in Portland cement ...

Get Price

Dielectric Characterization of Chinese Standard Concrete ...

2017-2-17  using the dielectric constant of 28-day cement concrete. 2. Materials and Methods 2.1. Design and Fabrication of GB Concrete In order to study the relationship between the compressive strength and respective dielectric constant of GB concrete, common ordinary GB concrete with a number of different water to cement (w/c) ratios, was investigated.

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Microstructure and mechanical properties of microwave ...

2014-12-3  Concrete is conventionally composed of dielectric materials capable of effectively absorbing microwave energy, including Portland cement, aggregates, water, and admixtures. In particular, water has a high relative dielectric constant r and loss tangent (tan ), and when the electric field E

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Low CO2 Concrete

As stated earlier, approximately one ton of CO 2 is released for every ton of Portland cement produced. Figure 2 illustrates the benefits of substituting 50 percent slag cement in various concrete mixtures. Between 165 and 374 pounds of CO 2 are saved per cubic yard of concrete by using a 50 percent slag cement substitution, a 42 to 46 percent ...

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THE EFFECT OF CALCIUM NITRATE ON THE PROPERTIES

2020-6-9  The eect of calcium nitrate on the properties of portland cement pastes and concrete hardening at low temperatures Ceramics – Silikáty 64 (3) 263-270 (2020) 265 The cement paste hardening kinetics was followed by the exothermic (EXO) profile, according to the Alcoa methodology [29]. The water/cement ratio for all the pastes was –0.3.

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