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

2019 ◽  
Vol 104 ◽  
pp. 103364 ◽  
Author(s):  
Kamran Amini ◽  
Payam Vosoughi ◽  
Halil Ceylan ◽  
Peter Taylor
Keyword(s):  
Mechanical Properties ◽  
Slag Cement ◽  
Salt Scaling ◽  
Void System ◽  
Air Void ◽  
Scaling Resistance

Effect of w/c ratio on air-void system of foamed concrete and their influence on mechanical properties

2011 ◽  
Vol 63 (8) ◽  
pp. 583-595 ◽  
Author(s):  
Tiong-Huan Wee ◽  
Saradhi Babu Daneti ◽  
Thangayah Tamilselvan
Keyword(s):  
Mechanical Properties ◽  
Void System ◽  
Foamed Concrete ◽  
Air Void

Air void system and frost-salt scaling of concrete containing slag-blended cement

2009 ◽  
Vol 23 (6) ◽  
pp. 2451-2456 ◽  
Author(s):  
Zbigniew Giergiczny ◽  
Michal A. Glinicki ◽  
Marcin Sokołowski ◽  
Marek Zielinski
Keyword(s):  
Blended Cement ◽  
Salt Scaling ◽  
Void System ◽  
Air Void

scholarly journals Additional Porosity as a Side Effect of Polycarboxylate Addition and Its Influence on Concrete’s Scaling Resistance

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 316
Author(s):  
Aneta Nowak-Michta
Keyword(s):  
Pore Structure ◽  
Side Effect ◽  
Freeze Thaw ◽  
Concrete Mixtures ◽  
Spacing Factor ◽  
Void System ◽  
Variable Content ◽  
Air Void ◽  
The Impact ◽  
Scaling Resistance

A side effect of using modified polycarboxylates to liquefy a concrete mix is additional pores in the concrete. They change the air void system in hardened concretes, and can be used to evaluate the freeze–thaw resistance of concretes. The purpose of this study is to determine the impact of the abovementioned quantitative and qualitative parameters on the freeze–thaw resistance of concretes. The research program was performed on eight sets of air-entraining and non-air-entraining concretes with a variable content of superplasticizer based on modified polycarboxylates. The basic composition of and air-entraining admixture content in the air-entraining concrete mixtures were held constant. Pore structure tests were performed according to EN 480-11. Scaling resistance was determined according to PKN-CEN/TS 12390-9. The results showed that as the content of modified polycarboxylates increased, the pore structure was adversely affected, and, consequently, the air void parameters deteriorated. At the same time, the freeze–thaw resistance of the non-air-entraining concretes decreased. The pores sizes also changed. As the fluidity increased, the specific surface area decreased, and, consequently, the spacing factor increased. The air-entraining concretes, despite the deterioration in the pore structure due to the modified polycarboxylates, were found to be very good quality concretes after 56 freeze–thaw cycles in the presence of 3% NaCl.

scholarly journals Freeze–Thaw Resistance and Air-Void Analysis of Concrete with Recycled Glass–Pozzolan Using X-ray Micro-Tomography

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 154
Author(s):  
Marija Krstic ◽  
Julio F. Davalos ◽  
Emanuele Rossi ◽  
Stefan C. Figueiredo ◽  
Oguzhan Copuroglu
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
The United States ◽  
Adsorption Method ◽  
X Ray ◽  
Freeze Thaw ◽  
Void System ◽  
Spatial Parameters ◽  
Micro Tomography ◽  
Air Void

Recent studies have shown promising potential for using Glass Pozzolan (GP) as an alternative supplementary cementitious material (SCM) due to the scarcity of fly ash and slag in the United States. However, comprehensive studies on the freeze–thaw (FT) resistance and air void system of mixtures containing GP are lacking. Therefore, this study aimed to evaluate GP’s effect on FT resistance and characterize mixtures with different GP contents, both macro- and microscopically. In this study, six concrete mixes were considered: Three mixes with 20%, 30% and 40% GP as cement replacements and two other comparable mixes with 30% fly ash and 40% slag, as well as a mix with 100% Ordinary Portland cement (OPC) as a reference. Concrete samples were prepared, cured and tested according to the ASTM standards for accelerated FT resistance for 1000 cycles and corresponding dynamic modulus of elasticity (Ed). All the samples showed minimal deterioration and scaling and high F/T resistance with a durability factor of over 90%. The relationships among FT resistance parameters, air-pressured method measurements of fresh concretes and air void analysis parameters of hardened concretes were examined in this study. X-ray micro-tomography (micro-CT scan) was used to evaluate micro-cracks development after 1000 freeze–thaw cycles and to determine spatial parameters of air voids in the concretes. Pore structure properties obtained from mercury intrusion porosimetry (MIP) and N2 adsorption method showed refined pore structure for higher cement replacement with GP, indicating more gel formation (C-S-H) which was verified by thermogravimetric analysis (TGA).

scholarly journals Environmental Assessment of Frost-resistant Concrete with Superabsorbent Polymers

2020 ◽  
Vol 63 (2) ◽  
pp. 43-62
Author(s):  
Gui Li ◽  
Marianne Tange Hasholt ◽  
Ole Mejlhede Jensen
Keyword(s):  
Environmental Impact ◽  
Concrete Strength ◽  
Significant Loss ◽  
Strength Increase ◽  
Life Cycle Assessment Methodology ◽  
Void System ◽  
Strength And Durability ◽  
Air Entraining Agents ◽  
Air Void ◽  
The Impact

AbstractAir-entraining agents (AEA) are normally used to improve the frost resistance of concrete. However, it is not possible to accurately control the air void system in concrete with AEA. Thus, a significant loss of concrete strength is caused by over-dosing voids, and this increases the environmental impact from concrete structures. Superabsorbent polymer (SAP) can also be used to produce frost-resistant concrete. Compared to AEA, it can be used to precisely engineer the air void structure of concrete, promote cement hydration, and mitigate self-desiccation cracks. In this study, life cycle assessment methodology is applied to evaluate the overall environmental impact of frost-resistant concrete based on AEA and SAP, respectively. The results illustrate that frost-resistant concrete with SAP has a lower environmental impact than frost-resistant concrete with AEA if the strength and durability of concrete are considered in the defined functional unit. In addition, frost-resistant concrete with SAP reduces the environmental burdens of the vertical elements such as columns, but it increases the environmental load of the horizontal elements such as slabs, where the strength increase cannot be utilized. Moreover, the inventory data for AEA and SAP can affect the impact assessment results.

scholarly journals EFFECT OF MIXING TIME ON THE SALT SCALING RESISTANCE OF CONCRETE WITH MICROSPHERES

2017 ◽  
Vol 71 (1) ◽  
pp. 373-378
Author(s):  
Yuto TANAKADATE ◽  
Shunsuke HANEHARA ◽  
Tetsuya OYAMADA ◽  
Kazuma IGARASHI
Keyword(s):  
Mixing Time ◽  
Salt Scaling ◽  
Scaling Resistance
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