Behavior of high performance concrete pastes with different mineral admixtures in simulated seawater environment

Han, Chuanzhou; Shen, Weiguo; Ji, Xiaoli; Wang, Zhongwen; Ding, Qingjun; Xu, Guangyou; Lv, Zhenjie; Tang, Xinglei

doi:10.1016/j.conbuildmat.2018.07.196

Cited by 39 publications

(11 citation statements)

References 23 publications

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“…Hydration products "self-heal" defects in the structure of concrete, which determines the increased frost resistance of concrete. The results are consistent with the studies [4,7,[9][10][11].…”

Section: The Kinetics Of Water Absorption Of Concretesupporting

confidence: 93%

“…hydrophobic concrete that has a dense structure. Forming corrosion products in the hydrophobic interporous space are modified, i.e., most part of the poorly soluble salts doesn't crystallize and passes into an amorphous state which in accordance with the studies [7,9,10]. This leads to a decrease in stresses in the pores of the concrete and naturally to a decrease in the destructive effect on the structural elements of the concrete.…”

Section: The Kinetics Of Water Absorption Of Concretesupporting

confidence: 78%

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Efficient modified concrete for irrigation and drainage facilities construction

Tkach

Sadchikova

2018

MATEC Web Conf.

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The paper describes scientific and technical prerequisites for the development of composition of and production method for hydrophobic complex modifier based on the industrial wastes, including technical lignosulfonates (TLS) as a plasticizing ingredient; oil and fat tar as hydrophobic ingredient; and saponified wood pitch (SWP) as air entraining ingredient. The purpose of the presented studies was the development of an efficient modified concrete composition for construction of irrigation and drainage facilities construction by using a complex hydrophobic modifier. Experimental studies were carried out on concrete samples made of reference and test compositions in the laboratory of the “Building Materials” Department of the National Research Moscow State University of Civil Engineering. Comprehensive studies showed that the use of hydrophobic modifier allows obtaining concrete with water bleeding ratio reduced by 35–40%; reducing the concrete capillary suction and water absorption by 3 times; and increasing water penetration pressure (W8 and more), in comparison with concrete without additives. The developed complex hydrophobic modifier increases the strength by 12-18% and reduces shrinkage strain of concrete by 7.5% in comparison with the control composition without the modifier.

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Section: The Kinetics Of Water Absorption Of Concretesupporting

confidence: 93%

Section: The Kinetics Of Water Absorption Of Concretesupporting

confidence: 78%

Efficient modified concrete for irrigation and drainage facilities construction

Tkach

Sadchikova

2018

MATEC Web Conf.

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“…Slag ini memiliki oksida yang sama dengan semen Portland (kapur, silika dan alumina) tapi dengan proporsi yang berbeda. Reaksi pozzolanic dari GGBFS dapat mengurangi sebagian besar Ca(OH) 2 yang terbentuk akibat reaksi kimia hidrasi pasta semen (Han et al, 2018). GGBFS akan bereaksi dengan Ca(OH) 2 membentuk gel C-S-H sekunder, sehingga secara signifikan meningkatkan ketahanan pasta terhadap serangan kimia (Oner and Akyuz, 2007).…”

Section: Pendahuluanunclassified

Performa Beton Dengan Ground Granulated Blast Furnace Slag Terhadap Sulfate Attack

2020

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Serangan sulfat (sulfate attack) termasuk hal yang umum terjadi pada struktur beton, mengingat ion sulfat banyak dijumpai pada tanah, air tanah dan air laut. Peningkatan ketahanan beton melawan sulfat akan berdampak besar pada durabilitas dan umur layan struktur beton. Penambahan supplementary cementitious materials seperti GGBFS (ground granulated blast furnace slag) ke campuran beton telah terbukti memberikan pengaruh positif terhadap durabilitas dan properti mekanis beton. Namun, GGBFS tergolong material yang baru dikembangkan di Indonesia dan potensinya dalam meningkatkan durabilitas beton belum dimanfaatkan secara luas. Berdasarkan hal tersebut, perlu dilakukan investigasi terkait aplikasi GGBFS dan pengaruhnya terhadap durabilitas beton, terutama dalam melawan serangan sulfat. Dalam studi ini, durabilitas beton dengan persentase penggantian GGBFS 30%, 50% dan 70% terhadap total volume binder dievaluasi menggunakan perlakuan siklus basah-kering dalam larutan magnesium sulfat. Tingkat degradasi beton diukur dengan melakukan observasi terhadap perubahan kuat tekan dan massa spesimen akibat serangan sulfat. Hasil penelitian menunjukkan bahwa penggantian GGBFS hingga 50% dari total volume binder dapat meningkatkan ketahanan beton terhadap serangan sulfat, ditunjukkan dengan kehilangan massa dan reduksi kekuatan yang lebih rendah dibandingkan spesimen kontrol dengan 100% semen Portland.

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“…When fly ash is used as a partial cement replacement, not as an addition, the early strength of fly ash concrete is reduced due to the slow pozzolanic reaction of the ash [ 12 , 13 ]. Nevertheless, the replacement of cement with up to 30–35% fly ash improves certain properties of concrete in both fresh and hardened states (higher workability, lower hydration heat, and higher strength and durability in the long-term) [ 3 , 14 , 15 , 16 , 17 , 18 ], so this percentage is generally considered optimal and is often used. In fact, cement containing up to 35% fly ash (CEM II/B-V) is made in Europe and some European standards, such as Spanish standard EHE-08, allow the addition of this percentage of fly ash to reinforced concrete when cement without additions is used.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrated Lime on the Chloride-Induced Reinforcement Corrosion in Eco-Efficient Concretes Made with High-Volume Fly Ash

et al. 2020

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The main objective of this study was to analyze the influence that the addition of finely ground hydrated lime has on chloride-induced reinforcement corrosion in eco-efficient concrete made with 50% cement replacement by fly ash. Six tests were carried out: mercury intrusion porosimetry, chloride migration, accelerated chloride penetration, electrical resistivity, and corrosion rate. The results show that the addition of 10–20% of lime to fly ash concrete did not affect its resistance to chloride penetration. However, the cementitious matrix density is increased by the pozzolanic reaction between the fly ash and added lime. As a result, the porosity and the electrical resistivity improved (of the order of 10% and 40%, respectively), giving rise to a lower corrosion rate (iCORR) of the rebars and, therefore, an increase in durability. In fact, after subjecting specimens to wetting–drying cycles in a 0.5 M sodium chloride solution for 630 days, corrosion is considered negligible in fly ash concrete with 10% or 20% lime (iCORR less than 0.2 µA/cm2), while in fly ash concrete without lime, corrosion was low (iCORR of the order of 0.3 µA/cm2) and in the reference concrete made with Portland cement, only the corrosion was high (iCORR between 2 and 3 µA/cm2).

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Behavior of high performance concrete pastes with different mineral admixtures in simulated seawater environment

Cited by 39 publications

References 23 publications

Efficient modified concrete for irrigation and drainage facilities construction

Efficient modified concrete for irrigation and drainage facilities construction

Performa Beton Dengan Ground Granulated Blast Furnace Slag Terhadap Sulfate Attack

Influence of Hydrated Lime on the Chloride-Induced Reinforcement Corrosion in Eco-Efficient Concretes Made with High-Volume Fly Ash

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