Evaluation of strength at early ages of self-compacting concrete with high volume fly ash

Sukumar, Binu; Nagamani, K.; Raghavan, Ravi

doi:10.1016/j.conbuildmat.2007.04.005

Cited by 146 publications

(52 citation statements)

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“…A high cement content contributes to produce a greater early-age compressive strength 38 . In addition, high-workability concrete generally provides a greater early-age compressive strength than normal-workability concrete due to enhanced strength development and better compactability 39 . The results of permeable voids (see Section 4.2.5.)…”

Section: Compressive Strengthmentioning

confidence: 99%

Properties of high-workability concrete with recycled concrete aggregate

et al. 2011

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This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0-100% natural coarse aggregate (NCA) by weight. The slump and slump flow of fresh concretes were determined to ensure high workability. In addition, the compressive, flexural and splitting tensile strengths, modulus of elasticity, and permeable voids of hardened concretes were determined. The test results revealed that RCA significantly decreased the workability of concrete. RCA also affected the compressive strength, modulus of elasticity, and permeable voids of concrete. At the age of 28 days, the concrete with 100% RCA provided 12.2% lower compressive strength and 17.7% lesser modulus of elasticity than the control concrete. Also, 100% RCA increased the permeable voids of 28-day old concrete by 8.2%. However, no significant negative impact of RCA was observed on the flexural and splitting tensile strengths of concrete.

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Section: Compressive Strengthmentioning

confidence: 99%

Properties of high-workability concrete with recycled concrete aggregate

et al. 2011

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“…Kendiliğinden yerleşen beton (KYB) da bu farklı beton türlerinin en önemlilerinden birisidir. KYB'nin yüksek akışkanlığı sayesinde kendi ağırlığı ile ayrışma ve terleme olmaksızın yerleşebilmesi, hiçbir şekilde vibrasyona ihtiyaç duymamasından dolayı işçilik tasarrufu, zaman kazandırma özelliği ve yapı kalitesini artırması, KYB'yi vazgeçilmez bir beton haline getirmiştir [1][2][3]. KYB'nin tüm bu özelliklerini sağlamak amacıyla KYB'ye katılan ve KYB üretimi için vazgeçilmez bir unsur olan kimyasal katkılar ise segregasyonu (ayrışma) azaltmak, KYB'nin kendi ağırlığı ile sıkışmasını sağlamak, su miktarını azaltmaya yardımcı olarak, terlemenin azalması neticesinde boşlukları azaltmak ve işlenebilirliği artırmak için daima gereklidir.…”

Section: Introductionunclassified

Bazi̇k Pomzanin Kendi̇li̇ği̇nden Yerleşen Betonlarin İşlenebi̇li̇rli̇k Özelli̇kleri̇ Üzeri̇ne Etki̇si̇

Öz¹,

Yücel²,

Güneş³

2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu çalışma kendiliğinden yerleşen beton (KYB) üretiminde Osmaniye bazik pomzasının işlenebilirliğe olan etkisini araştırmak amacıyla gerçekleştirilmiştir. Bazik pomza katkılı kendiliğinden yerleşen beton (KYBB) üretimi 0,32 sabit su/bağlayıcı (çimento + uçucu kül) oranında, 690±20 mm sabit bir çökme akışıyla, yüksek oranda su azaltıcı katkı (akışkanlaştırıcı) kullanılarak gerçekleştirilmiştir. İlk olarak bazik pomza hiç katılmaksızın kontrol betonu sabit su/bağlayıcı oranı ile dökülmüş ve daha sonra bazik pomza %20, %30, %40, %50 ve %60 oranlarında her defasında iri agreganın yerine ikame edilerek karışıma eklenmiştir. Bazik pomzanın KYBB'lerin taze ve sertleşmiş haldeki özellikleri üzerine etkilerini tespit etmek amacıyla taze haldeki betonun çökme yayılma tablasında akış çapı ve T 500 süresi, V hunisinde boşalma süresi, L kutusunda yükseklik oranı testleri ve 28 günlük basınç dayanımı testi yapılmıştır. KYBB'de kullanılan bazik pomza miktarı arttıkça işlenebilirliğin giderek azaldığı tespit edilmiştir. Bu nedenle en fazla %60 oranında bazik pomza kullanılarak KYBB üretilebilmiştir. KYB'nin basınç dayanımı ise bazik pomzanın özgül ağırlığının kırma taştan düşük olmasından dolayı %23 oranında bir azalma göstermiştir.Anahtar Kelimeler: Bazik pomza, kendiliğinden yerleşen beton, taze özellik EFFECT OF BASIC PUMICE ON THE WORKABILITY CHARACTERISTICS OF SELF-COMPACTING CONCRETES ABSTRACTThis study has been carried out to investigate the effect of Osmaniye basic pumice on the workability characteristics of self-compacting concrete (SCC). Self-compacting concrete incorporated basic pumice (SCCB) with a constant water / binder ratio (cement + fly ash) of 0.32 was produced at a fixed slump flow diameter of 690±20 mm by adjusting the amount of High-Range-Water-Reducing-Admixture (HRWRA). First, control concrete without basic pumice was produced at a constant water/binder ratio and then basic pumice replacing the coarse aggregate in the proportions of 20%, 30%, 40%, 50% and 60% was added to the mixture. To identify effects of basic pumice on properties in the fresh and hardened state of SCCB, slump flow diameter, T 500 flow time, V-funnel flow time, L-box height ratio and 28-day compressive strength tests were conducted. Increasing amount of the basic pumice in the SCC resulted in a gradual decrease of workability. Therefore, SCCB has been manufactured by adding basic pumice up to 60%. Due to the specific weight of basic pumice lower than that of crushed stone, compressive strength of SCC showed a decrease of 23%.

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“…The influence of Fly Ash (FA) content in SCC on the early age properties, workability, compressive strength, ultrasonic pulse velocity, absorption & shrinkage was studied by Sukumar et al [23], Khatib [15], Liu [19] , Khanand Sharma [18], Mithun and Narsimhan [21] & Poon and Ho [22]. It was found that FA was technically feasible to be utilized in SCC & besides environmental benefits, there were technical and financial benefits as well such as high workability, high compressive strength upto 20% replacement of cement by FA & increased sorptivity with FA content between 60-80% .…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Durability Performance of Self Compacting Concrete Containing Fly Ash And Metakaolin

Khan¹

2017

jscmt

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This paper is concerned with Self compacting concrete (SCC) which is a highly flow-able, non-segregating concrete that can spread into place, fill the formwork and encapsulate the reinforcement without any need for vibration. The elimination of the need for compaction leads to better quality concrete and substantial improvement of working conditions. It compacts itself due to its self-weight and is de-aerated almost completely while flowing into the formwork. Thus, the two main properties specific to fresh SCC are its filling-ability and passing ability. In this paper, different mixes of SCC were prepared and these fresh properties were investigated through V-funnel and L-box test, respectively. Also the compressive strength of hardened SCC cubes was measured after specified days of curing (7, 14, 28, 60 & 90 days). Furthermore, the durability properties, like Surface absorption and Permeability, were determined by Initial Surface Absorption Test (ISAT) and Capillary Suction Test, respectively.

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Evaluation of strength at early ages of self-compacting concrete with high volume fly ash

Cited by 146 publications

References 0 publications

Properties of high-workability concrete with recycled concrete aggregate

Properties of high-workability concrete with recycled concrete aggregate

Bazi̇k Pomzanin Kendi̇li̇ği̇nden Yerleşen Betonlarin İşlenebi̇li̇rli̇k Özelli̇kleri̇ Üzeri̇ne Etki̇si̇

Mechanical and Durability Performance of Self Compacting Concrete Containing Fly Ash And Metakaolin

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