Effect of aggregate type on properties of hardened self-consolidating lightweight concrete (SCLC)

Topçu, İ̇lker Bekir; Uygunoğlu, Tayfun

doi:10.1016/j.conbuildmat.2009.12.007

Cited by 175 publications

(81 citation statements)

References 17 publications

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“…11. It can be seen that the value of a 0 is larger than the recommended value from [3], but it is in line with the value reported by [45], who derived a 0 (0.1242) and b 0 (0.0011) also based on selfcompacting lightweight concrete. However, as already presented in [48], the thermal conductivity of a material is related not only to the porosity or density of the matrix, but also to the thermal conductivity and particle shape of all the materials in the matrix.…”

Section: Thermal Propertiessupporting

confidence: 77%

“…As presented in Table 3, the cement content in the present study is kept at the same low level, around 420 kg/m 3 , for all the three mixes. Further analysis of the structural efficiency is carried out using the lightweight aggregates concrete/mortar produced with different types of LWA, such as expanded clay, pumice, tuff, diatomite and recycled bricks [1,9,44,45], and the results are shown in Fig. 10.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…It can be seen that, with the increase of the density, the thermal conductivity of the two SCLC increases. ACI committee 213R-03 [3] and Topcu and Uygunoglu [45] reported that the relation between the thermal conductivity and density follows an exponential relationship, which reads as: Using the experimental values from Table 8 for SCLC1, SCLC2 and reference self-compacting concrete, the values of a 0 and b 0 can be obtained employing the Solver function from Microsoft Excel@, yielding a 0 and b 0 of 0.11 and 0.0012 respectively, with the coefficient of determination (R 2 ) of 0.99. The results are shown in Fig.…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Spiesz

Brouwers

2013

Cement and Concrete Composites

134

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a b s t r a c tThis article aims at the development of durable cement-based lightweight aggregate composites, with a good balance between the thermal and mechanical properties. The mixtures are developed with the optimized packing applying the modified Andreasen and Andersen model, to obtain the optimal target grading curve of all the solids in the mixture. A lightweight material produced from recycled glass is used as the lightweight aggregates (LWA) in order to obtain the desired low thermal conductivity.The properties of the designed composites, including the flowability and relative viscosity in fresh state, and the porosity, strength and thermal properties in hardened state are investigated. The porosity of the developed composites is studied by both modeling and experiments. Results indicate that there is a certain amount of closed internal LWA pores in the composites, which contributes positively to a better thermal insulation property. The developed composites have a low thermal conductivity while still retaining sufficient strength. Therefore, the designed composite can be used monolithically as both load-bearing element and thermal insulator.

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Section: Thermal Propertiessupporting

confidence: 77%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

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Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Spiesz

Brouwers

2013

Cement and Concrete Composites

134

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“…Although numerous investigations have been made on SCC and LWC, to the authors' best knowledge little research has been conducted on the design procedures and statistical modeling of LWSCC (Hwang et al 2012;Bogas et al 2012;Topçu and Uygunoglu 2010;Andiç-Ç akır and Hızal 2012). Wu et al (2009) investigated workability of LWSCC and its mix design using expanded shale as both fine and coarse aggregates.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Self-consolidating Concrete with Expanded Shale Aggregates: Modelling and Optimization

Lotfy

Hossain

Lachemi

2015

International Journal of Concrete Structures and Materials

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This paper presents statistical models developed to study the influence of key mix design parameters on the properties of lightweight self-consolidating concrete (LWSCC) with expanded shale (ESH) aggregates. Twenty LWSCC mixtures are designed and tested, where responses (properties) are evaluated to analyze influence of mix design parameters and develop the models. Such responses included slump flow diameter, V-funnel flow time, J-ring flow diameter, J-ring height difference, L-box ratio, filling capacity, sieve segregation, unit weight and compressive strength. The developed models are valid for mixes with 0.30-0.40 water-to-binder ratio, high range water reducing admixture of 0.3-1.2 % (by total content of binder) and total binder content of 410-550 kg/m 3 . The models are able to identify the influential mix design parameters and their interactions which can be useful to reduce the test protocol needed for proportioning of LWSCCs. Three industrial class ESH-LWSCC mixtures are developed using statistical models and their performance is validated through test results with good agreement. The developed ESH-LWSCC mixtures are able to satisfy the European EFNARC criteria for self-consolidating concrete.Keywords: expanded shale aggregates, lightweight self-consolidating concrete, multi-objective optimization, water to binder ratio, high range water reducing admixture, total binder content, statistical model.

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“…Papanicolaou and Kaffetzakis (2009) presented the development of PASCC (all-LWASCC) falling in the LC20/22 strength class and D1.4 density class (as per EN 206-1) focusing on the effect of coarse-to-fine aggregates ratio on the material's rheological and mechanical properties. In an extensive work Uygunoğlu et al (2010), studied the effect of different natural LWA types (pumice, volcanic tuff and diatomite) on the mechanical and physical properties of LWASCC. Of all aggregates in question diatomite produced the highest Slump-Flow results.…”

Section: State-of-the-art On Lwasccmentioning

confidence: 99%

Lightweight Aggregate Self-Compacting Concrete: State-of-the-Art & Pumice Application

Papanicolaou

Kaffetzakis

2011

ACT

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The scope of this study is twofold: first to present the current state-of-knowledge on lightweight aggregate selfcompacting concrete (LWASCC) and second to discuss the development of pumice aggregate self-compacting concrete (PASCC) falling in the LC20/22 strength class and D1.4 density class (as per EN 206-1). Former studies have showed that the commonly accepted range of values derived from fresh-state tests on normal weight self-compacting concrete (NWSCC) is also attainable for LWASCC, the majority of which is produced using artificial lightweight aggregates. The second part of the paper presents the findings of an experimental program that aimed to assess the effect of coarseto-fine pumice aggregates ratio on the rheological and mechanical properties of PASCC. Based on the results of this study it is verified that properly designed PASCC mixtures with a dry density in the order of 1400 kg/m 3 may be evaluated while in fresh state using the same test methods applicable for normal weight self-compacting concrete (NWSCC) and yield scores that lie within the commonly accepted ranges. If pumice aggregates are introduced in the mix in a saturated state, PASCC exhibits self-compactness similar to the one typically characterizing most NWSCC mixtures. Surface coating of fine and coarse pumice aggregates -though difficult in practice -improves workability and prolongs its retention.

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Effect of aggregate type on properties of hardened self-consolidating lightweight concrete (SCLC)

Cited by 175 publications

References 17 publications

Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Lightweight Self-consolidating Concrete with Expanded Shale Aggregates: Modelling and Optimization

Lightweight Aggregate Self-Compacting Concrete: State-of-the-Art & Pumice Application

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