Effect of basic pumice on morphologic properties of interfacial transition zone in load-bearing lightweight/semi-lightweight concretes

Ayhan, Mustafa; Gönül, Hatice; Gönül, İsmail Ağa; Karakuş, Askeri

doi:10.1016/j.conbuildmat.2010.11.083

Cited by 15 publications

(7 citation statements)

References 18 publications

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“…4, perlite and aliven at a rate of 325 kg/m 3 of concrete, cement 500 kg/m 3 of concrete, water/cementitious-material ratio (a/mc) of 0.35, and addition of 10% nanosilica in replacement by weight of the cement content. From previous researches [7] and the literature review [11,[21][22][23][24], a ratio of 0.35 a/mc was selected, allowing good workability, so as not to require the use of a superplasticizer in the mixture, which could lead to modifications in the microstructure of the ITZ and cementitious matrix of interest in this study. e proportion of cement of 500 kg/m 3 is the product of the bibliographical revision; for which in some studies, compressive strength in LWC greater than 17.5 MPa [7,21,[25][26][27] was achieved.…”

Section: Preparation Of Test Samples For Compressive Strength Andmentioning

confidence: 99%

“…From previous researches [7] and the literature review [11,[21][22][23][24], a ratio of 0.35 a/mc was selected, allowing good workability, so as not to require the use of a superplasticizer in the mixture, which could lead to modifications in the microstructure of the ITZ and cementitious matrix of interest in this study. e proportion of cement of 500 kg/m 3 is the product of the bibliographical revision; for which in some studies, compressive strength in LWC greater than 17.5 MPa [7,21,[25][26][27] was achieved. e use of 10% of nanosilica was due to the previous results [16], where it was observed that the optimal replacement of cement by suspended silica nanoparticles was in this percentage, since the compressive strength increased considerably, with respect to a control sample; in addition, the pore network in the cementitious matrix decreased and its tortuosity increased as well, which decreased the penetration of aggressive agents [16].…”

Section: Preparation Of Test Samples For Compressive Strength Andmentioning

confidence: 99%

“…e LWA have an array of vesicles or air void within their mass. e size, spacing, and interconnection of the vesicles make these aggregates capable of producing concrete with lower density close to 1850 kg/m 3 , with advantages such as increased thermal insulation, extended moist curing, and increased durability [7]. e effect of lightweight aggregates on both the microstructure and durability of mortars and concretes has been studied by several researchers [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack

Vargas

Marín

Tobón

2018

Advances in Civil Engineering

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e influence of two lightweight aggregates (LWA) on concrete and the effects of cement substitution for nanosilica (NS) on the interfacial transition zone (ITZ) and cementitious matrix of concrete in resistance to attacks by magnesium sulfate (MgSO 4 ) are researched in this work. e aggregates evaluated were perlite, which is a lightweight aggregate of open porous structure, and expanded clay (aliven) with closed porous structure. e variables included in the study were replacement percentage of coarse aggregates by lightweight coarse aggregates (0 and 100% by volume) and replacement percentage of cement by nanosilica (0 and 10% by weight). In the dosage of the mixtures, water/cementitious-material ratio constant of 0.35 was used. e LWA were characterized by XRD, XRF, and SEM techniques. Compressive strength, water absorption, and volume change in magnesium sulfate solution (according to ASTM C1012 for a period of 15 weeks) of lightweight concretes were evaluated. It was found that the nanosilica had effect on refinement in the pore system; however, the main incidence on the compressive strength and durability of lightweight concrete (LWC) was defined by the characteristics of lightweight aggregate used in its preparation.

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Section: Preparation Of Test Samples For Compressive Strength Andmentioning

confidence: 99%

Section: Preparation Of Test Samples For Compressive Strength Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack

Vargas

Marín

Tobón

2018

Advances in Civil Engineering

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“…In SEM images, ITZ porosity is related to its surface hydration products and porosity decreases with increasingly dense C-S-H gels [ 43 ]. A large number of rod-shaped Aft, C-S-H gels and unfilled pores are present near the ITZ of dry old mortar.…”

Section: Resultsmentioning

confidence: 99%

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Yang

Guo

et al. 2022

Materials

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Poor mechanical properties and durability of recycled aggregate concrete (RAC) hinder its application in the construction field. In this study, pre-wetted recycled coarse aggregate was used as the internal curing material for prepared RAC with low water-to-binder ratio (W/B), aiming to improve the mechanical properties and durability. The results show that the workability decreases with increasing contents of pre-wetted recycled coarse aggregate. The variation in compressive strength of RAC with different contents of pre-wetted recycled coarse aggregate is obvious within 28 d. After 28 d, the effect of internal curing of pre-wetted recycled coarse aggregate starts to occur, causing a sustained increase in compressive strength. The sealed concrete with 50% and 75% pre-wetted recycled coarse aggregate contents presents the highest compressive strength and better internal curing effect. The pre-wetted recycled coarse aggregate decreases the relative humidity inside the concrete and effectively inhibits the development of shrinkage in the early stages. The RAC with pre-wetted recycled coarse aggregate presents little effect on the drying shrinkage. Additionally, the electric flux of RAC cured for 28 d increases from 561C to 1001C, which presents good resistance to chloride permeation. Microscopic tests indicate that the incorporation of pre-wetted recycled coarse aggregate is beneficial to the improvements of internal structure of RAC.

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“…Production of artificial lightweight aggregates such as Leca requires the combustion of fuels to provide high temperatures in the range of 1100 to 1200°C by the rotary kiln process to melt raw materials such as clay (Bhatty & Reid, 1989;Harmon, 2007). Therefore, these types of lightweight aggregate are not economic and also ecologic materials (Ayhan, Gönül, Gönül, & Karakuş, 2011).…”

Section: Introductionmentioning

confidence: 99%

Oil palm shell as an agricultural solid waste in artificial lightweight aggregate concrete

Shafigh

Salleh

Ghafari³

et al. 2016

European Journal of Environmental and Civil Engineering

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The aim of this study was to produce a sustainable construction material by incorporating an agricultural solid waste, namely oil palm shell (OPS), in an artificial lightweight aggregate concrete. For this purpose, in a structural lightweight aggregate concrete made of expanded clay, the lightweight aggregate was substituted with OPS in 0, 25 and 50% by volume. Properties such as compressive strength under different curing conditions, as well as density, splitting tensile and flexural strengths, modulus of elasticity and drying shrinkage of expanded clay-OPS concretes were measured and discussed. The test results showed that partial substitution of expanded clay by OPS increased the density, compressive strength, specific strength (compressive strength to weight ratio), as well as splitting tensile and flexural strengths of lightweight concrete. However, it was observed that the modulus of elasticity decreased by about 4 and 13% in the 25 and 50% substitution levels, respectively. The expanded clay-OPS concretes showed greater drying shrinkage strain compared to expanded clay lightweight concrete. In addition, it was found that the sensitivity of compressive strength of concretes containing OPS to the lack of curing is due to high drying shrinkage and consequently micro-cracks formation in the interfacial transaction zone of the concretes.

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Effect of basic pumice on morphologic properties of interfacial transition zone in load-bearing lightweight/semi-lightweight concretes

Cited by 15 publications

References 18 publications

Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack

Performance and Microstructural Analysis of Lightweight Concrete Blended with Nanosilica under Sulfate Attack

Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition

Oil palm shell as an agricultural solid waste in artificial lightweight aggregate concrete

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