Characteristics of self-consolidating concrete using two types of lightweight coarse aggregates

Kim, Yong Jic; Choi, Yun Wang; Lachemi, Mohamed

doi:10.1016/j.conbuildmat.2009.08.004

Cited by 116 publications

(64 citation statements)

References 8 publications

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“…The use of VMA is associated with reduction in paste volume which is believed to be detrimental to the LWSCC mixture stability, passing ability, filling ability and segregation resistance. Further, many successful LWSCC mixtures were developed without the use of VMA (Lachemi et al 2009;Kim et al 2010;Karahan et al 2012). The silica fume is used to enhance the fresh properties as it helps to improve the cohesiveness and homogeneity of the LWSCCs; holding the lightweight coarse aggregates in place, and preventing them from floating.…”

Section: Research Programmentioning

confidence: 99%

“…Hwang and Hung (2005) evaluated the performance of LWSCC mixtures containing bottom ash, for varying water to cement ratio (w/c) and cement paste content. Kim et al (2010) studied the semi-lightweight SCC characteristics using two types of coarse aggregates with different densities. Nine mixes were evaluated in terms of flowability, segregation resistance and filling capacity of fresh concrete.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Research Programmentioning

confidence: 99%

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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“…Tüm bu avantajlara rağmen, beton kullanımı yüksek öz ağırlığı ve diğer inşaat malzemelerine kıyasla kalifiye işçilik fazlalığından dolayı bazı yapılarda sınırlı olmaktadır. Bu nedenle, son yıllarda inşaat sektörünün ortaya çıkan talepleri karşılamak için, kendiliğinden yerleşen beton ve hafif beton gibi yeni beton türlerine olan ilgisi giderek artmaktadır [1][2][3][4].…”

Section: Introductionunclassified

“…Kim ve ark. düşük özgül ağırlığa sahip hafif agreganın KYB'nin işlenebililiğini olumlu etkilediğini göstermiştir [3,4]. Fakat Khaleel [9], hafif iri agreganın maksimum boyutunun artmasıyla KYB'nin akışkanlığı ve geçebilme kabiliyetinin azaldığını bulmuştur.…”

Section: Introductionunclassified

Asi̇di̇k Pomza İle Üreti̇len Kendi̇li̇ği̇nden Yerleşen Betonlarin Taze Özelli̇kleri̇

Yücel¹,

Öz²,

Kömür³

et al. 2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu çalışmada asidik pomza ile üretilen kendiliğinden yerleşen betonun (KYB) taze haldeki özellikleri incelenmiştir. Bu amaçla altı farklı beton karışımı, su/bağlayıcı oranı (çimento + uçucu kül) 0,32 ve slump yayılma çapı 720 ± 20 mm olacak şekilde tasarlanmıştır. İlk karışım tamamen doğal agregadan üretilirken, diğer karışımlarda iri agrega %20, %40, %60, %80 ve %100 oranlarında kullanılan asidik pomza ile değiştirilerek kendiliğinden yerleşen asidik pomzalı betonlar (KYBA) elde edilmiştir. Asidik pomzanın taze beton özelliklerine olan etkisini belirlemek amacıyla karışımlar üzerinde slump yayılma çapı, T 500 süresi, V hunisinde boşalma süresi ve L kutusunda yükseklik oranı deneyleri yapılmıştır. Yapılan deney sonuçlarına göre; KYB'de kullanılan asidik pomza miktarı arttıkça işlenebilirliğin arttığı tespit edilmiştir.Anahtar Kelimeler: Kendiliğinden yerleşen beton, asidik pomza, taze özellikler FRESH PROPERTIES OF SELF-COMPACTING CONCRETES PRODUCED WITH ACIDIC PUMICE ABSTRACTFresh properties of self-compacting concrete (SCC) produced with acidic pumice were investigated in this study. For this purpose, six different concrete mixtures were designed with water / binder ratio (cement + fly ash) of 0.32 and slump flow diameter of 720±20 mm. While first mixture was produced with totally natural aggregate, other mixtures were prepared by acidic pumice replaced with the coarse aggregate in the proportions of 20%, 40%, 60%, 80% and 100% in the mixtures which were self-compacting concrete incorporating acidic pumice (SCCA). Slump flow diameter, T 500 flow time, V-funnel flow time and L-box height ratio tests were conducted to determine effects of acidic pumice on fresh properties. According to the test results, it was identified that the workability of SCC increased with increasing the amount of acidic pumice.

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“…On the other hand, pumice LWASCC mixtures exhibited the highest specific strengths, due to the excellent interaction between these aggregates and the cement paste, as evidenced through microscopy of the interfacial transition zone. Kim et al (2010) investigated the characteristics of (mostly) semi-lightweight (2000 kg/m 3 -2300 kg/m 3 ) SCC using two types of artificial LWA with different densities. It was reported that as the density of the LWA decreases the flowability improves but the segregation resistance tends to decrease.…”

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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Characteristics of self-consolidating concrete using two types of lightweight coarse aggregates

Cited by 116 publications

References 8 publications

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

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

Asi̇di̇k Pomza İle Üreti̇len Kendi̇li̇ği̇nden Yerleşen Betonlarin Taze Özelli̇kleri̇

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

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