Capillary absorption of structural lightweight aggregate concrete

Bogas, José Alexandre; Gomes, M. Glória; Real, Sofia

doi:10.1617/s11527-014-0364-x

Cited by 53 publications

(27 citation statements)

References 14 publications

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“…In other words, for the water content conditions of the tested concretes, the LWA would not have significantly contributed to the absorption mechanism. Similar findings were obtained by Bogas et al [12].…”

Section: Capillary Absorptionsupporting

confidence: 92%

“…The SF appears to have refined and densified the porous structure of the paste in both the SLWAC and the NWC. Other authors also reported better performances for concrete with SF [8,12,22]. However, for high w/b ratios the trend was different and SF was not effective.…”

Section: Capillary Absorptionmentioning

confidence: 95%

“…The participation of the more porous aggregates in the capillary transport tended to be more relevant in concretes with higher w/ b ratio, largely because of the high porosity and interconnectivity of the porous structure of the paste, which increases the aggregate's accessibility [12,54]. Therefore, the capillary absorption depends essentially on the quality of the paste and on the aggregate-paste interfacial zone, which explains why the behavior found for SLWAC and NWC was similar (Fig.…”

Section: Capillary Absorptionmentioning

confidence: 96%

“…For the durability of concrete, the aggregate-paste composite system should be analyzed as a whole and not as the sum of the separate contribution of the two phases [12,13]. Despite the greater permeability of LWA, other factors, such as the protection provided by the paste, especially pastes of high compacity [13][14][15], and the better quality of the aggregate-paste interfacial transition zone (ITZ) usually presented by SLWAC [3,4,8,16], contribute to the good performance of lightweight concrete.…”

Section: Introductionmentioning

confidence: 99%

“…The capillary absorption test is very widely used to evaluate the durability of concrete because it is straightforward to perform and the results are easy to interpret [34]. The capillary absorption of SLWAC of different compositions and with different types of aggregate was analyzed by Bogas et al [12]. Contrary to expectations, the authors found that the high porosity of LWA appears to be of secondary importance in this property.…”

Section: Introductionmentioning

confidence: 99%

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Chloride migration in structural lightweight aggregate concrete produced with different binders

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Section: Capillary Absorptionsupporting

confidence: 92%

Section: Capillary Absorptionmentioning

confidence: 95%

Section: Capillary Absorptionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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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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Effects of surface modification of silane coupling agent on the properties of concrete with freeze-thaw damage

Fang²,

Zhao

2017

KSCE J Civ Eng

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Capillary absorption of structural lightweight aggregate concrete

Cited by 53 publications

References 14 publications

Chloride migration in structural lightweight aggregate concrete produced with different binders

Chloride migration in structural lightweight aggregate concrete produced with different binders

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

Effects of surface modification of silane coupling agent on the properties of concrete with freeze-thaw damage

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