Analysis of Destructive Processes in Unloaded Early-age Concrete with the Acoustic Emission Method

Bacharz, Magdalena; Goszczyńska, Barbara; Trąmpczyński, Wiesław

doi:10.1016/j.proeng.2015.06.144

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…Proper requirements for coatings are strictly described in the Eurocode 2 standard. Well designed and constructed concrete coating allows the building to be used for many years without failure and thorough repairs in accordance with the assumed construction class [1,2,4,5]. The type of cement has significant impact on the quality of the coating [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Air-Entraining Agent in the Concrete Coating on the Reinforcement Corrosion Process in Case of Simultaneous Action of Chlorides and Frost

Raczkiewicz

2018

Advances in Materials Science

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The paper presents the test results to evaluate the effect of air-entraining agent addition on the intensity of reinforcement corrosion in concrete with blast-furnace slag cement in the case of simultaneous action of chloride corrosion and frost. Two groups of reinforced concrete specimens were prepared for the study. The first group of specimens included air-entraining agent addition and the other group was prepared without air-entraining agent. The blast-furnace slag cement (CEM III/A) was used for the specimens. Two parallel reinforcing rods were placed in each specimen. The specimens were subjected to 120 cycles of freezing and thawing in 3% NaCl solution to induce corrosion on the reinforcement. To determine the occurrence of the reinforcement corrosion and estimate the corrosion activity the non-destructive electrochemical galvanostatic pulse method was used. On each specimen the corrosion current density of the reinforcement was measured as well as the reinforcement stationary potential and the concrete coating resistivity, i.e. values indicating the ongoing reinforcement corrosion. Measurements were made on all specimens in two steps: before freezing and thawing cycles in 3% NaCl solution and after the cycles. The analysis of the obtained results allowed to determine differences in corrosion processes intensity on the reinforced bars in the concrete specimens depending on whether or not the air-entraining agent was added. Based on the analysis it was found that in the case of simultaneous action of chloride corrosion and frost it is advisable to use both blast-furnace slag cement and air-entraining agent. The use of only blast-furnace slag cement (although it is a chloride resistant cement), without the addition of airentraining agent is insufficient.Keywords: reinforcement corrosion in concrete, influence of chlorides and frost, galvanostatic pulse method, blast-furnace slag cement, air-entraining agent

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Section: Introductionmentioning

confidence: 99%

Influence of the Air-Entraining Agent in the Concrete Coating on the Reinforcement Corrosion Process in Case of Simultaneous Action of Chlorides and Frost

Raczkiewicz

2018

Advances in Materials Science

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“…The stages in the development of the signal database are described in [17]. The initial reference signal database, based on the collection of 12 AE signal parameters, comprises four signal classes, which, as described in [18,21], correspond to the damage processes that occur in concrete during the curing period:…”

Section: Iadp Acoustic Emission Methodsmentioning

confidence: 99%

“…In [21] it was demonstrated that the modified IADP method, can be used for identification and location of damage processes also in early age non-loaded concrete.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission method as a tool for the assessment of influence of the temperature variation on destructive processes created in early age concrete

2019

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During the early age concrete treatment (curing and hardening) the damage process appears i.e., microcracks in the cement paste, propagation of internal microcracks, and formation of microcracks on the surface of concrete that affect concrete. It can be the serious source that initiate cracks that will propagate in the further loading stage, thereby affecting the overall strength and durability of structures. Hence, it is quite important to have a tool to identify the damage processes created up during the early age concrete treatment. The Identification of Active Damage Processes (IADP) acoustic emission method, modified to suit the tests on non-loaded concrete, was applied to determine and locate the damage processes that appears during the hardening conditions taking into account the temperature fluctuations on which construction structures are exposed (constant temperature of 22ºC or cyclic temperature variations in the range -5ºC/+42ºC) in non-loaded concrete produced with basalt aggregate and blast furnace cement. It is shown that the modified IADP method, can be used to assess the influence of the temperature variation on damage process in early age non-loaded concrete. As an example, concrete produced with basalt aggregate and blast furnace cement was used.

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“… 1 The tests and analysis of W5 and W8 samples results were described in [ 45 ], 2 the test results of the B2 and B3 samples were described in [ 44 ]. …”

Section: Figurementioning

confidence: 99%

“…The non-invasive acoustic emission method (modified IADP method—Identification of Active Destructive Processes method) presented in [ 42 , 43 , 44 ] has been shown to be suitable for investigating defect formation process at the early stage of hardening of young concrete.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission for Determining Early Age Concrete Damage as an Important Indicator of Concrete Quality/Condition before Loading

2020

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Phenomena occurring during the curing of concrete can decrease its mechanical properties, specifically strength, and serviceability, even before it is placed. This is due to excessive stresses caused by temperature gradients, moisture changes, and chemical processes arising during the concreting and in hardened concrete. At stress concentration sites, microcracks form in the interfacial transition zones (ITZ) in the early phase and propagate deeper into the cement paste or to the surface of the element. Microcracks can contribute to the development of larger cracks, reduce the durability of structures, limit their serviceability, and, in rare cases, lead to their failure. It is thus important to search for a tool that allows objective assessment of damage initiation and development in concrete. Objectivity of the assessment lies in it being independent of the constituents and additives used in the concrete or of external influences. The acoustic emission-based method presented in this paper allows damage detection and identification in the early age concrete (before loading) for different concrete compositions, curing conditions, temperature variations, and in reinforced concrete. As such, this method is an objective and effective tool for damage processes detection.

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Analysis of Destructive Processes in Unloaded Early-age Concrete with the Acoustic Emission Method

Cited by 15 publications

References 3 publications

Influence of the Air-Entraining Agent in the Concrete Coating on the Reinforcement Corrosion Process in Case of Simultaneous Action of Chlorides and Frost

Influence of the Air-Entraining Agent in the Concrete Coating on the Reinforcement Corrosion Process in Case of Simultaneous Action of Chlorides and Frost

Acoustic emission method as a tool for the assessment of influence of the temperature variation on destructive processes created in early age concrete

Acoustic Emission for Determining Early Age Concrete Damage as an Important Indicator of Concrete Quality/Condition before Loading

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