Effect of different expanded aggregates on durability-related characteristics of lightweight aggregate concrete

Chung, Sang-Yeop; Sikora, Paweł; Kim, Dong-Joo; Madawy, Mohamed E. El; Elrahman, Mohamed Abd

doi:10.1016/j.matchar.2021.110907

Cited by 27 publications

(12 citation statements)

References 62 publications

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“…To quantify the sealing ability of MTA and BD, tortuosity analysis was conducted. Tortuosity is an indicator of the shortest path in which fluid flows in the specimen, which represents the percolation and sealing ability of materials [ 20 , 31 ]. The minimum value of the tortuosity is 1, which indicates that the line formed by connecting any point in the void cluster is almost linear without any curvature.…”

Section: Discussionmentioning

confidence: 99%

Void characteristics and tortuosity of calcium silicate-based cements for regenerative endodontics: a micro-computed tomography analysis

et al. 2021

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Background Internal voids of materials can serve a hub for microorganism and affect the sealing ability. This study aimed to evaluate the sealing performance of calcium silicate-based cements in immature teeth treated with regenerative endodontics. Methods Twenty single root canals from immature permanent premolars were prepared using regenerative endodontic protocols. The root canals were randomly divided into two groups and sealed with mineral trioxide aggregate (MTA) and Biodentine (BD). The teeth were kept in humid environment for 7 days and scanned using micro-computed tomography. The voids within the cements were segmented and visualized using image processing, incorporating the modified Otsu algorithm. The porosity of each sample was also calculated as the ratio between the number of voxels of voids and the volume of the cements. Tortuosity was also calculated using the A-star algorithm. Results Voids larger than 70 μm were predominantly observed in the top and interfacial surface of cements. The others were evenly distributed. MTA and BD showed the same level of porosity and tortuosity at interfacial surfaces. In inner surfaces, MTA showed more less porosity and tortuosity compared to BD (p < 0.05). Conclusions There were no differences in sealing performance between MTA and BD.

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Section: Discussionmentioning

confidence: 99%

Void characteristics and tortuosity of calcium silicate-based cements for regenerative endodontics: a micro-computed tomography analysis

et al. 2021

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“…To this point, FGAs have primarily been used in Europe, but the first vertically integrated plant to produce these aggregates in the United States, AeroAggregates (Eddystone, PA), was founded in 2012. FGAs have been used in several construction applications including embankment fill, 4,5 a thermal insulation layer in pavements, 6 and concrete 7–11 . This work explores the use of ultralightweight FGA, a dry‐foamed closed‐cell product manufactured by AeroAggregates, in precast concrete.…”

Section: Introductionmentioning

confidence: 99%

“…FGAs have been used in several construction applications including embankment fill, 4,5 a thermal insulation layer in pavements, 6 and concrete. [7][8][9][10][11] This work explores the use of ultralightweight FGA, a dry-foamed closed-cell product manufactured by AeroAggregates, in precast concrete. The lightweight density and low thermal conductivity of FGA makes these aggregates ideal for precast concrete applications such as thermally insulated wall panels.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of ultralightweight foamed glass aggregates in precast concrete

Mathews

Wertz

Khan

et al. 2022

Structural Concrete

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This project investigates the use of foamed glass aggregates in lightweight precast concrete. Precast mixes are evaluated for compression and split‐tension strength, and durability is assessed through rapid chloride permeability, thermal conductivity, alkali silica reactivity, and freeze–thaw performance. Mixes containing a 100% or 50% replacement of gravel with foamed glass aggregates are evaluated. The 100% mixes have a 28‐day compression strength = 23.3–27.89 MPa which is acceptable per structural lightweight concrete standards (ASTM C330), but the split‐tension strength falls short of ASTM C330 requirements. The 50% mixes have acceptable strength but exceed the maximum density allowed for lightweight concrete in ASTM C330. The mixes exhibited low–moderate permeability but poor freeze–thaw resistance. All of the proposed mixes with one exception have acceptable expansion due to alkali silica reactivity. The thermal conductivity of the mixes varies from typical lightweight to normal weight concrete ranges with respect to the aggregate replacement ratio.

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“…At the present time, the LWAs can be synthesized using different natural precursors as clay and shale (de'Gennaro et al 2009). Compared to the traditional concrete made with normal weight aggregate, the LWAC has a fairly high porosity (Chung et al 2021) and low density as a result of embedding porous lightweight ingredients (Mehta and Monteiro 2014). Further, the LWAC is used to enhance the energy efficiency of building structures by reducing the required thermal energy up to 15% versus to normal weight concrete (Real et al 2016).…”

Section: Introductionmentioning

confidence: 99%

An investigation on the performance of lightweight mortar-based geopolymer containing high-volume LECA aggregate against high temperatures

Ouda

Rashad

2021

Environ Sci Pollut Res

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The influence of lightweight expanded clay aggregate (LECA) on the physico-mechanical properties and microstructure of geopolymer mortar containing slag binder alkali-activated with sodium silicate solution before and after exposure to thermal loads was investigated. In the current procedure, siliceous sand was partially substituted with LECA fine aggregate at levels of 0%, 25%, 50%, 75%, and 100%, by volume. The effect of LECA on the performance before exposure was evaluated by measuring flowability, water absorption, bulk density, thermal conductivity, and compressive strength. To monitor the behavior after exposure, a batch of specimens having the same composition was subjected to high temperatures in the range of 400-1000 °C for 2 h with a heating rate of 5 °C/min. In a similar fashion, mass loss and residual compressive strength were determined. New phase-based geopolymers were examined using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The findings indicated that the incorporation of LECA up to 100% as an alternative to siliceous sand aggregate in geopolymer mortar has an adverse effect on compressive strength and water absorption, but has a positive effect on workability, thermal conductivity, and relative strength after exposure to elevated temperatures.

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Effect of different expanded aggregates on durability-related characteristics of lightweight aggregate concrete

Abstract: , M. (2021). Effect of different expanded aggregates on durability-related characteristics of lightweight aggregate concrete. Materials Characterization,

Cited by 27 publications

References 62 publications

Void characteristics and tortuosity of calcium silicate-based cements for regenerative endodontics: a micro-computed tomography analysis

Void characteristics and tortuosity of calcium silicate-based cements for regenerative endodontics: a micro-computed tomography analysis

Evaluation of ultralightweight foamed glass aggregates in precast concrete

An investigation on the performance of lightweight mortar-based geopolymer containing high-volume LECA aggregate against high temperatures

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