The Use of Additives to Enhance Properties of Pre- Formed Foamed Concrete

Hilal, Ameer A.; Thom, Nick; Dawson, Andrew

doi:10.7763/ijet.2015.v7.806

Cited by 71 publications

(22 citation statements)

References 24 publications

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“…To make foamed concrete mixes suitable for structural purposes (denser than 1300 kg/m 3 and having more than 17 MPa compressive strength, (Neville 2011)), a preliminary experimental program (Hilal et al 2015c), in terms of compressive strength tests, was carried out on the least dense mix (FC3, 1300 kg/m 3 ). Compared to a conventional mix FC3 (6 MPa 28-day compressive strength), adding 10% silica fume (FCs3), 20% fine sand replacement with fly ash (FCf3) and 1.5% superplasticizer by weight of binder (FCp3) individually improved the 28-day compressive strength by about 10% (to 6.5 MPa), 60% (to 9.5 MPa) and 115% (to 13 MPa), respectively.…”

Section: Proportions and Productionmentioning

confidence: 99%

“…Then two further mixes at 1600 kg/m 3 with LWA (FCy6 and FCya6) were added, replacing 25% of the sand, to investigate the effect of LWA on the failure mechanism, see Table 1. As described in previous publications (Hilal et al 2015b(Hilal et al , 2015c, mix proportioning began with the selection of the target density (1300-1900 kg/m 3 ), the cement content and the water to cement ratio and the mix was proportioned by the method of absolute volumes. For each mix the water/binder ratio required to produce a stable mix (fresh density to target density ratio close to unity) was determined by trials while the required foam volume was determined from the mix design.…”

Section: Proportions and Productionmentioning

confidence: 99%

“…However, Giaccio et al (2007) stated that this is not necessarily the case when a highly effective mineral such as silica fume (usually no more than 10% of cement weight) is used. Compared to conventional foamed concrete mixes, inclusion of admixtures in combination (fly ash, silica fume and superplasticizer) has been found to improve both the cement-paste microstructure and air-void structure of foamed concrete (Hilal et al 2015b) leading to improved strength (Hilal et al 2015c). Regan and Arasteh (1990) stated that a foamed cement matrix and lightweight aggregate (LWA) combination, producing a lightweight aggregate foamed concrete, appears to offer a real weight saving, significant thermal insulation and sufficient strength for structural application with the possibility of casting in-situ with conventional equipment.…”

Section: Introductionmentioning

confidence: 99%

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Failure Mechanism of Foamed Concrete Made with/without Additives and Lightweight Aggregate

Hilal

Thom

Dawson

2016

ACT

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It has been reported that owing to a densification of the internal structure of concrete, adding mineral admixtures leads to a more brittle behaviour. Therefore, with the intention of modifying (increasing the strength of) foamed concrete to make it suitable for structural purposes by means of admixtures and lightweight aggregate addition, the effect of these additions on the failure mechanism under compressive and tensile loading using different techniques is evaluated and discussed in this paper. Eight different mixes, made using a pre-formed foam, were investigated with varying density (different foam volumes), nominally 1300, 1600 and 1900 kg/m 3 , without/with admixtures (silica fume, fly ash and superplasticizer) and lightweight aggregate. The Digital Image Correlation (DIC) technique was adopted to measure the deformations and strains on the surface of a specimen under uniaxial compressive load. Meanwhile, a Video Gauge technique was used to measure the horizontal deformation of discs during a splitting tensile test. From elasticity, fracture and fractal points of view, it was found that, for the same density, brittleness increases with many of the additives while it reduces with inclusion of lightweight aggregate. However, for all mixes, the lower the density (higher added foam volume), the higher the ductility.

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Section: Proportions and Productionmentioning

confidence: 99%

Section: Proportions and Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Failure Mechanism of Foamed Concrete Made with/without Additives and Lightweight Aggregate

Hilal

Thom

Dawson

2016

ACT

Self Cite

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“…The pore structure of a material plays a dominant role in controlling its thermal conductivity (Hilal et al 2015). Hemp concrete, manufactured by a projection process, as shown by Elfordy et al (2008), has a conductivity that can reach 0.49 W/m K for a volumetric mass of 550 kg/m 3 .…”

Section: Thermal Conductivitymentioning

confidence: 99%

Effect of Scoria on Various Specific Aspects of Lightweight Concrete

Rajaonarison

Gacoin

Randrianja

et al. 2017

Int J Concr Struct Mater

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Experimental research on the technical characteristics of lightweight concretes incorporating scoria was conducted. The objective of this research is to investigate the feasibility and effectiveness of the use of scoria, in lightweight concretes. Coarse scoria of 5/10 and 10/20 mm were used. A portion of the aggregate mixtures had an average particle size B100 lm. Scorias are often used as the constituents of structural concrete and insulating materials. The usability of the concretes tested in this study broadens as the porosity of the mixtures decreased and the cement dosage increased. According to the cement dosage and frequency types, the absorption coefficients of concretes ranged from 0.14 to 0.47. A compressive strength of 19 MPa corresponded to a density of 1800 kg/m 3 ; compressive strengths from 10 to 18 MPa mapped to densities ranging from 1300 to 1700 kg/ m 3 . The thermal conductivity of mixed concretes without scoria reached a maximum value of 0.268 W/m K. The thermal conductivity values of the concretes mixed without sand were below 0.403 W/m K. As sand content increased, the conductivity evolved from 0.565 to 0.657 W/m K. Freeze-thaw stability tests were conducted for 400 cycles or until specimens deteriorated. The experimental results helped in determining the optimum mixing conditions for the inclusion of scoria in cement to produce lightweight concretes.

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“…Also, for better compressive and flexural strength development, total water curing is required up to 56 days than curing in air. The properties of LFC were investigated by replacing the cement and fine sand with silica fume and fly ash [14]. The study was carried out on 1300 to 1900 kg/m 3 concrete density; among the properties studied are consistencies, mechanical and thermal properties.…”

Section: Previous Investigation On Structural Properties Of Lfcmentioning

confidence: 99%

Effect of Curing Method on Properties of Lightweight Foamed Concrete

Kado¹,

Mohammad²,

Lee³

et al. 2018

IJET

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Lightweight construction is aimed to achieve a sustainable feature by reducing transportation frequency and construction materials usage during construction phase. Lightweight precast concrete may serve an alternative for the lightweight construction. There are rarely application can be found for structural members as lightweight panels always to be used for secondary or non-load bearing members. This paper presents an experimental study on properties (compressive strength, splitting tensile strength, water absorption) of lightweight foamed concrete (LFC) at two different curing methods. LFC with densities of 1500, 1700, and 1800 kg/m 3 , cementsand ratio of 2:1 and water-cement ratio of 0.5 were investigated. The results showed LFC can be produced with the properties of density range of 1500 to 1800 kg/m 3 and corresponding compressive strength of 10 to 39 MPa. The higher the density of LFC, the less the water absorption for all the curing method considered, the highest and the lowest water absorption was 11.3% and 2.0% for 1500 kg/m 3 cured in water and 1800 kg/m 3 cured in air respectively. Compressive strength of LFC increases with age and density while water cured LFC has high compressive strength. Splitting tensile strength increases with density of LFC, but air cured LFC has more splitting tensile strength than water cured of the same density. The highest splitting tensile strength recorded was 3.92 MPa for 1800 kg/m 3 cured in air, which was about 16% of its compressive strength at 28 days of curing age. These properties are important and can be applied to LFC precast structural members with air or water curing method which have less references for LFC in structural usage.

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The Use of Additives to Enhance Properties of Pre- Formed Foamed Concrete

Cited by 71 publications

References 24 publications

Failure Mechanism of Foamed Concrete Made with/without Additives and Lightweight Aggregate

Failure Mechanism of Foamed Concrete Made with/without Additives and Lightweight Aggregate

Effect of Scoria on Various Specific Aspects of Lightweight Concrete

Effect of Curing Method on Properties of Lightweight Foamed Concrete

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