Linking air-void system and mechanical properties to salt-scaling resistance of concrete containing slag cement

Amini, Kamran; Vosoughi, Payam; Ceylan, Hali̇l; Taylor, Peter

doi:10.1016/j.cemconcomp.2019.103364

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…The limit value in the NAC of acceptable quality is w/c = 0.35, while in the AEC with an air content of 5.5 ± 0.5% it is w/c = 0.5. The obtained results confirm the literature data [ 1 , 5 , 7 , 8 , 46 ] with regard to the w/c limit values enabling the obtaining of concretes resistant to scaling; in addition, they confirm the same MP with which the new generation of concrete mixes is liquefied; although they change the air void structure [ 36 ], they do not affect the resistance to scaling. Thus, the problem of the decrease in resistance to scaling in the SCC concretes [ 28 ], as a result of additional air entrainment when liquefied with modified polycarboxylates, does not apply to pavement concretes, in which concrete mixes with consistency classes S2–S4 are standardly used [ 35 ].…”

Section: Discussionsupporting

confidence: 87%

Salt Scaling Resistance of Variable w/c Ratio Air-Entrained Concretes Modified with Polycarboxylates as a Proper Consequence of Air Void System

Nowak-Michta

2022

Materials

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The values of the air void parameters in hardened concrete (spacing factor L ≤ 0.200 mm and micro air content A300 ≥ 1.5%), determined on the basis of the Powers model, in concretes produced today do not always guarantee the frost resistance of the concrete, especially when in surface impact with the participation of de-icing agents. The literature indicates that the modified polycarboxylates used to liquefy concrete mixes are one of the factors involved in changing the air void system; therefore, the aim of the article was to determine the dependence of the air void parameters and the resistance to scaling of concretes liquefied to a constant consistency by the use of modified polycarboxylates in the spectrum of variability of the ratio w/c = 0.53 ÷ 0.30. In the research program, twelve concrete mixes were made with a constant proportion of aggregate and paste: six air-entrained—with a constant air content of 5.5 ± 0.5%—and six non-air-entrained. The air void parameters were determined in accordance with EN 480-11, while the resistance to scaling was determined in accordance with CEN/TS 12390-9 and assessed according to the criteria of SS 137244. The analysis of the test results showed that liquefaction with modified polycarboxylates did not affect the w/c limit values, enabling obtaining concretes resistant to scaling. They are, respectively, 0.35 in the non-air-entrained concretes and 0.50 in the air-entrained concretes with an air content of 5.5 ± 0.5. Moreover, the commonly used criterion for ensuring the frost resistance of air-entrained concretes, L ≤ 0.200 mm and A300 ≥ 1.5%, requires supplementing with the minimum value of the w/c ≤ 0.50.

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Section: Discussionsupporting

confidence: 87%

Salt Scaling Resistance of Variable w/c Ratio Air-Entrained Concretes Modified with Polycarboxylates as a Proper Consequence of Air Void System

Nowak-Michta

2022

Materials

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“…For example, salt scaling of the mixtures made with 40% slag cement is twice that of mixtures made with 20% slag cement replacement. Similar results have been obtained by other researchers [12,50].…”

Section: Effect Of Finishingsupporting

confidence: 92%

“…These results, therefore, confirm that testing the mechanical properties and salt scaling of mixtures containing slag as a cement replacement at 28 days or less can be misleading. Similar relationship between abrasion resistance and salt scaling is reported elsewhere [50].…”

Section: Relationship Between Different Propertiessupporting

confidence: 88%

Effect of finishing practices on surface structure and salt-scaling resistance of concrete

Amini

Ceylan

Taylor

2019

Cement and Concrete Composites

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The impact of three different finishing times on the surface layer properties of concrete containing different contents of slag cement replacement was evaluated, as well as the relationship between finishing, abrasion resistance of surface layer, and salt-scaling resistance. In addition, a novel method for monitoring the bleeding period of fresh concrete was investigated.Based on the results obtained in this study, choice of finishing time can influence salt scaling resistance by affecting abrasion resistance of concrete mixtures. It was found that lower resistance of slag cement concrete to salt scaling is not necessarily due to a weaker surface layer.While slag replacement reduced the mixtures' scaling resistance, up to 40% of slag replacement improved mechanical properties, including surface abrasion resistance.

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“…Martys and Ferraris [25] showed that sorptivity is indispensable element for predicting the service life of concrete. However, researchers have reported in the past and recent that the addition of certain admixtures to the concrete increased the sorptivity [26], [27]. The results obtained in the present study showed that the sorptivity measured at 28 days steadily increased with the increase in addition of dolomite powder.…”

Section: Figure 5 Sorptivity Values Obtained At 90 Days For Concrete supporting

confidence: 50%

Sorptivity and Durability Assessment of Dolomite Impregnated Ternary Concrete

Khan¹,

Challa²,

Varma³

et al. 2019

IJRTE

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Traditional testing methods such as absorption test and permeability test are normally not providing accurate results of nature of concrete and there is a need for another type of test to predict the durability of concrete. In this work, industrial by-product like dolomite, marble dust and fly ash are utilized as fraction of cement replacing with 2%, 4%, 6%, 8%, and 10% dolomite, 10% fly ash and 10% marble dust by the weight of cement. The study is conducted on mix designed concrete of M30 grade and compared with conventional concrete. The specimens are casted and tested to examine various properties of concrete like compressive strength, split tensile strength, durability and sorptivity. Durability test is done by hydrochloric acid (HCl) and sulphuric acid (H2SO4 ) on dolomite powder, promising results were obtained in the sorptivity test which shows the dense nature of concrete by the usage of dolomite powder.

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Linking air-void system and mechanical properties to salt-scaling resistance of concrete containing slag cement

Cited by 13 publications

References 25 publications

Salt Scaling Resistance of Variable w/c Ratio Air-Entrained Concretes Modified with Polycarboxylates as a Proper Consequence of Air Void System

Salt Scaling Resistance of Variable w/c Ratio Air-Entrained Concretes Modified with Polycarboxylates as a Proper Consequence of Air Void System

Effect of finishing practices on surface structure and salt-scaling resistance of concrete

Sorptivity and Durability Assessment of Dolomite Impregnated Ternary Concrete

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