Tensile strength of structural expanded clay lightweight concrete subjected to different curing conditions

Bogas, José Alexandre; Nogueira, Rita

doi:10.1007/s12205-014-0061-x

Cited by 35 publications

(12 citation statements)

References 7 publications

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“…For instance, Shebannavar et al (2015) indicated that the hardened concrete specimens incorporating LECA coarse aggregate of size 4.75-20 mm are more workable than their counterparts having normal weight aggregate. Likewise, Bogas and Nogueira (2014) concluded similar observations for concrete with the inclusion of LECA coarse aggregate of size 4-12 mm compared with plain specimens containing normal weight aggregate. As for the density, Maghsoudi et al (2011) found that the self-compacting concrete having 175 kg/m 3 LECA coarse aggregate of size 4.75-9.5 mm achieved a density that fluctuated from 1890 to 1870 kg/m 3 at the age of 28 days.…”

Section: Introductionsupporting

confidence: 61%

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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Section: Introductionsupporting

confidence: 61%

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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“…However, similar to conventional concrete, plain apricot shell concrete (ASC) is a typical brittle material with low tensile strength and low energy absorption capacity [14]. At the same strength, the tensile strength of LWAC is only 0.8-0.85 of that of normal weight concrete [15]. Due to the high brittleness of concrete, an audible noise can be heard because of cracks produced before reaching the ultimate loading during the compressive test [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of fibre type and content on performance of bio-based concrete containing heat-treated apricot shell

Liu

et al. 2020

Mater Struct

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The heat-treated apricot shell can be utilized as coarse aggregates for producing sustainable bio-based lightweight concrete with good compressive strength but poor tensile strength. In order to improve the tensile properties of apricot shell concrete (ASC), the effects of polypropylene (PP) fibre, glass (G) fibre and basalt (B) fibre at various volume fractions (Vf) (0.25%, 0.5% and 0.75%) on the performance of ASC were investigated. The results indicated that the fibre type had no significant effect on the physical properties of ASC such as slump, density, water absorption and permeable porosity. However, the slump of ASC decreases with an increase in fibre content. The B fibre has a better improvement in mechanical properties than the PP fibre and G fibre thanks to the better elastic modulus and tensile strength. When the Vf was 0.5%, the compressive strength, splitting tensile strength, flexural strength and modulus of elasticity of ASC reinforced with B fibre were increased by 16.7%, 29.1%, 29.2%, and 18.1%, respectively, compared to ASC without any fibres. The magnesium sulfate attack results showed that the incorporation of the B fibre decreased the mass loss and compressive strength of ASC exposed to a MgSO4 solution for 6 months because the fibre arrested the microcracks caused by the expansive stress. It is concluded that the mechanical properties of bio-based ASC and its resistance to magnesium sulfate attack can be significantly improved by incorporating 0.5% B fibre.

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“…The determination of f ctm in Eqations (1) and (2) took into account the compressive strengths and dry densities, ρ dry , indicated in Table 4, assuming the relation between the compressive strength in cubic specimens and in cylindrical specimens, f cm,cyl of EN 1992-1 [42]. Furthermore, the axial tensile strength, f ctm , was considered to be about 90% of the splitting tensile strength [44].…”

Section: Tensile Splitting Strengthmentioning

confidence: 99%

Mechanical Characterisation and Shrinkage of Thermoactivated Recycled Cement Concrete

et al. 2021

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This paper investigates the mechanical and shrinkage behaviour of concrete with recycled cement (RC) thermoactivated from waste cement paste and waste concrete. Overall, compared to ordinary Portland cement (OPC), for the same water/binder ratio, the mechanical strength and ultrasonic pulse velocity were not significantly influenced by the incorporation of RC. The elasticity modulus decreased with the addition of RC and the shrinkage tended to increase at high RC content. The incorporation of up to 15% RC allowed the production of workable concrete with identical shrinkage and similar to higher mechanical strength than concrete with only OPC. RC proved to be a very promising more eco-efficient supplementary cementitious material.

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Tensile strength of structural expanded clay lightweight concrete subjected to different curing conditions

Cited by 35 publications

References 7 publications

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

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

Effect of fibre type and content on performance of bio-based concrete containing heat-treated apricot shell

Mechanical Characterisation and Shrinkage of Thermoactivated Recycled Cement Concrete

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