Anti-washout Concrete: An overview

Lu, Hao; Sun, Xiao

doi:10.1016/j.conbuildmat.2022.128151

Cited by 24 publications

(8 citation statements)

References 80 publications

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“…After 3 min of precipitation, most of the sediments sank to the bottom. The pH factor test has been proposed for determining the washout resistance of UWC in Japan [1]. However, the flocculating states significantly differ between AWAs alone and mortar without AWAs [38].…”

Section: Ph Factor Test and Stream Testmentioning

confidence: 99%

“…Underwater concrete construction presents significant challenges due to the washout of cementitious materials and loss of workability. Anti-washout admixtures (AWAs) are commonly used to enhance the cohesion and washout resistance of underwater concrete [1]. AWAs can be categorized as nonionic (e.g., HPMC, PAM) or anionic (e.g., PAC, CMS), depending on their ionic nature.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of the Performance of Underwater Concrete between Anionic and Nonionic Anti-Washout Admixtures

Song,

Zheng,

et al. 2024

Buildings

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An investigation was carried out to study the influence of two types of anti-washout admixtures (AWAs) on the performance of underwater concrete, specifically, workability and washout resistance. The tested AWAs were hydroxypropyl methylcellulose (HPMC) and polyacrylamide (PAM) as nonionic AWAs and carboxymethyl starch (CMS) and polyanionic cellulose (PAC) as anionic AWAs. Rheological properties (slump and slump flow), washout resistance, and compressive strength were measured to evaluate the properties of the fresh and hardened concrete. The results indicate that anionic AWAs are more effective at improving workability and strength than nonionic AWAs in anti-washout underwater concrete. When the nonionic AWA dosage exceeded 0.3% (W/C = 0.45), the fluidity and air content were negatively impacted. Additionally, nonionic AWAs more readily alter the morphological structure of cement paste, affecting cement particle hydration and underwater concrete properties. Regarding the mechanical properties, compared with those of concrete without AWAs and with nonionic AWAs, the 28-day compressive strength of concrete with anionic AWAs reached 37 MPa, an increase of 151% and 131%, respectively. Compared with nonionic AWAs, concrete with anionic AWAs is more stable.

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Section: Ph Factor Test and Stream Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Performance of Underwater Concrete between Anionic and Nonionic Anti-Washout Admixtures

Song,

Zheng,

et al. 2024

Buildings

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“…Chemical and physical properties of the binder materials are summarized in Table 1. Seven doses of AWA were 0.5%, 0.7%, 0.9%, 1.1%, 1.3%, 1.5% and 2% [20][21][22], natural welan gum in powdered form was used for the NDRPC, Figure 1 illustrates powdered materials were used to production NDRPC. A constant w/b of 0.25 was used for all NDRPC mixtures.…”

Section: Materials and MIX Proportionmentioning

confidence: 99%

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Al-Saffar,

Al-Shathr,

Abed

2023

MMEP

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A novel testing methodology was developed in this study to efficiently evaluate the non-dispersibility of Reactive Powder Concrete (RPC) that does not disperse (Non-Dispersive RPC or NDRPC) -a concrete variant derived from the amalgamation of RPC and non-dispersive concrete. To study the fresh behavior of NDRPC, a series of fourteen mixes were prepared, each incorporating an Anti-Wash Admixture (AWA) concentration ranging between 0.5% and 2%. Fresh state properties were identified through a series of Slump Flow, V Funnel, L-box, and Setting Time tests, while washout resistance was determined through modified Stream Test, Turbidity, and pH tests. The findings constitute the first efficient evaluation of the non-dispersibility of fresh Self-Compacted Mortar (SCM) or concrete mixtures when placed underwater, as ascertained by V Funnel and L-box tests under similar conditions. Experimental results indicated a synergistic effect between AWA and High Range Water Reducer Admixture (HRWRA) concentrations on the properties, which could be counterbalanced by increasing the incorporation of silica fume to 30%. Notably, a significant reduction in washout loss was observed when silica fume replacement was increased to 30%.

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“…ile Khaloo vd. basınç dayanımı çalışmalarında benzer şekilde, çelik liflerin eklenmesi ile beraber yüksek mukavemetli SCC' nin basınç dayanımında ortalama %10'luk bir azalma olduğunu bildirmişlerdir [22].…”

Section: şEkil 1 Betonun Basınç Dayanımındaki Değişimunclassified

Çelik Lifli Kendiliğinden Yerleşen Betonun Mekanik Özellikleri ve Dayanıklılığı

BİÇİCİ,

TOLA

2023

Kocaeli Üniversitesi Fen Bilimleri Dergisi

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Bu çalışma çelik fiber takviyeli kendiliğinden yerleşen betonun (SFRSCC) özelliklerini nasıl etkilediğini araştırmaktadır. Bu amaçla mekanik özelliklerini karakterize etmek ve dayanıklılık göstergelerini değerlendirmek için SFRSCC ve kendiliğinden yerleşen beton (SCC) numuneleri ile yapılan deneysel çalışmalar incelenip değerlendirilmiştir. Mekanik özellikler, basınç, yarmada çekme, elastisite modülü ve eğilme dayanımları için test analiz edilmektedir. Çelik fiber takviyeli kendiliğinden yerleşen betonun (SFRSCC) dayanıklılığına ilişkin araştırmalar hala çok azdır. Bu yüzden çelik fiberlerin korozyonunun çatlamaya ve ardından parçalanmaya yol açıp açmayacağı henüz net bir şekilde ortaya koyulmamıştır. Sonuçlar, çelik liflerin SCC'ye eklenmesinin, çatlama sonrası eğilme direncini ve enerji absorbsiyonunu arttırma açısından çok etkili olduğunu ve SCC'nin kendi kendine yerleşen gereksinimleri ve dayanıklılık göstergelerini önemli ölçüde etkilemediğini göstermiştir. Ayrıca araştırmalardan elde edilen bulgulara göre liflerin karışım özelliklerinin ve hacim oranının bu ana özellikleri önemli ölçüde etkileyebileceğini göstermiştir. Bu çalışma, birçok araştırmacı tarafından rapor edilen çok çeşitli uluslararası kaynaklardan toplanan veri tabanları ve deneysel olarak elde edilen veriler kullanılarak kapsamlı karşılaştırmalar sunmaktadır. Sunulan uygulama örnekleri ile ilgili bir derleme makale çalışması yapmıştır.

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Anti-washout Concrete: An overview

Cited by 24 publications

References 80 publications

Comparative Study of the Performance of Underwater Concrete between Anionic and Nonionic Anti-Washout Admixtures

Comparative Study of the Performance of Underwater Concrete between Anionic and Nonionic Anti-Washout Admixtures

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Çelik Lifli Kendiliğinden Yerleşen Betonun Mekanik Özellikleri ve Dayanıklılığı

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