Air Void Distribution of Asphalts Determined by Computed Tomography

Lublóy, Éva; Ambrus, Dávid; Kapitány, Kristóf; Barsi, Árpád

doi:10.3311/ppci.7608

Cited by 14 publications

(8 citation statements)

References 23 publications

(25 reference statements)

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“…The pores content and their distribution were determined alongside the sample using CT method, by measuring the pores with size larger than 0.01 mm. This method provides high accuracy and could be used as an alternative method for the other standard laboratory tests [29]. Figs.…”

Section: Computed Tomography Resultsmentioning

confidence: 99%

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Effects of Elevated Temperatures on the Properties of High Strength Cement Paste Containing Silica Fume

Abdelmelek

Lublóy

2021

Period. Polytech. Civil Eng.

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High strength concrete (HSC) production is worldwide increased and gradually replacing the normal strength concrete (NSC). The cement matrix of concrete is the essential part that governs the behavior and strength of concrete. Several researchers have focused on the performance of hardened cement paste (HCP) at ambient temperature such as using different types of supplementary cementitious materials (SCM). However, the performance of HCP after exposure to elevated temperatures requires further evaluation. The present study investigates the influence of different replacements of silica fume (SF) to cement and different water/binder ratios (w/b) on the compressive strength of HCP before and after exposure to elevated temperatures. Eighteen mixes have been prepared and tested. Results of compressive strength tests at ambient temperature were ranged from 58 to 102 MPa depending on the difference of w/b. Furthermore, a new method has been adopted for comparing the responses of HCP at elevated temperatures "heat endurance". Results showed that using SF enhances the residual compressive strength of HCP after exposure to elevated temperatures due to the pozzolanic reaction and the filler contribution. Mixes containing 6%, 12%, and 15% of SF have shown the highest relative residual compressive strength values for 0.30, 0.35, and 0.40 w/b, respectively. Consequently, the results were significantly affected by changing the w/b ratio. Finally, different measurement techniques were provided to support the work, including Thermo-Gravimetric (TG), Computed Tomography (CT), and Scanning Electron Microscope (SEM) analysis to characterize the loss of mass, porosity, and micro-structure alteration of HCP.

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Section: Computed Tomography Resultsmentioning

confidence: 99%

“…The examination of permeability, pores, and pore size distribution of HCP is feasible using CT method [29]. Siemens Somatom 16 was used for the CT tests at the Diagnostic and Oncoradiology Institute of Kaposvar University in Hungary.…”

Section: Computed Tomographymentioning

confidence: 99%

Effects of Elevated Temperatures on the Properties of High Strength Cement Paste Containing Silica Fume

Abdelmelek

Lublóy

2021

Period. Polytech. Civil Eng.

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“…With regard to the air void content derived from CT measurements and obtained using the EN 12697-8 standardised method, it can be concluded that there is a need for further research, in which not only a logical correlation but also a mathematical conversion should be established. In the latter case the nominal aggregate size must be taken into account [30,31].…”

Section: Discussionmentioning

confidence: 99%

Testing and interpreting permeability of asphalt mixes

2020

JCE

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Testing and interpreting permeability of asphalt mixesThis paper presents a field study showing the distribution of air voids in asphalt layers, and the potential effect of water on pavement performance. The paper also discusses the applicability of the European test method and equipment for assessing permeability of asphalt layers. A series of laboratory permeability tests were conducted on in-situ core samples and laboratory samples. It was found that mixes with smaller particle sizes, the air void content results in lower permeability compared to mixes with larger particle sizes.

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“…However, cyclic loading to determine the ratio of modulus in wet to dry conditions was used to determine the specimen's moisture sensitivity. Moreover, since the Durability and functionality of hot mix asphalts (HMA) depend on air voids and their characteristics [27], in this research the laboratory specimens were prepared in 7 ± 1 % of the air voids.…”

Section: Laboratory Programmentioning

confidence: 99%

Investigating the Effect of Metal Nanomaterials on the Moisture Sensitivity Process of Asphalt Mixes

Bargegol

Sakanlou

Sohrabi

et al. 2020

Period. Polytech. Civil Eng.

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One of the most common damages in asphalt mixes is the destructive effect of moisture on the binder cohesion and binder–aggregate adhesion which is called moisture damage. There are various methods to improve adhesion and reduce moisture damage in asphalt mixes. The most common of them is using an appropriate additive for binder modification. Accordingly, the current research was conducted to investigate the effect of two nanomaterials (Nano CuO, and Nano SnO2) in 2 different percentages on 2 types of aggregates (granite and limestone) and a type of base binder. In order to investigate the effect of nanomaterials, indirect tensile cyclic loading (the same as resilient modulus test) in dry and wet conditions and surface free energy (SFE) method were used. The moisture sensitivity indicator which shows stripping percentage of aggregate surface in loading cycles using SFE results and indirect tensile cyclic loading, has been considered as the moisture sensitivity indicator in this research. Results of mechanical tests used in this research show that nanomaterials have significantly increased asphalt mixes strength in comparison to control specimens. Results obtained from SFE method show that nanomaterials increase the cohesion free energy; this change causes a reduction in the possibility of failure in binder membrane. Additionally, nanoparticles have increased and reduced basic component and acidic component of SFE, respectively. This leads to improvement of their adhesion with acidic aggregates, which is sensitive to moisture damage.

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Air Void Distribution of Asphalts Determined by Computed Tomography

Abstract: Durability and functionality of hot mix asphalts (HMA)

Cited by 14 publications

References 23 publications

Effects of Elevated Temperatures on the Properties of High Strength Cement Paste Containing Silica Fume

Effects of Elevated Temperatures on the Properties of High Strength Cement Paste Containing Silica Fume

Testing and interpreting permeability of asphalt mixes

Investigating the Effect of Metal Nanomaterials on the Moisture Sensitivity Process of Asphalt Mixes

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