Investigation of Approaches for Improving Interfacial Transition Zone-Related Freezing-and-Thawing Resistance in Concrete Pavements

2015 ◽  
Vol 112 (5) ◽  
Author(s):  
Jiake Zhang ◽  
Peter C. Taylor ◽  
Caijun Shi
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Concrete Pavements ◽  
Freezing And Thawing

scholarly journals Exploration of Mechanisms of Joint Deterioration in Concrete Pavements regarding Interfacial Transition Zone

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xin Wang ◽  
Jiake Zhang ◽  
Xuhao Wang ◽  
Peter Taylor ◽  
Kejin Wang ◽  
...  
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Cold Weather ◽  
Salt Crystallization ◽  
Experimental Investigations ◽  
Concrete Pavements ◽  
Ion Transfer ◽  
Weak Point ◽  
Freeze Thaw ◽  
Work Samples

As a common issue for cold weather regions, premature deterioration of concrete at joints has been reported in many states. In this paper, the mechanisms of joint deterioration were investigated, and then, experimental investigations were conducted to further verify some of the mechanisms. It was found that freeze-thaw (F-T) damage and salt crystallization are not enough to cause the observed deterioration, but the deterioration near the interfacial transition zone (ITZ) may be the cause of some of the observed phenomena. In the experimental work, samples were tested at 40°F in salt solutions to observe the deterioration in the ITZ using the scanning electron microscope (SEM). Concrete tested in MgCl2 solution indicated distress in ITZ under SEM. It was found that ITZ may act as a shortcut for ion transfer to surrounding concrete near the joints and may also be the weak point for cracking due to expansion of the paste.

scholarly journals Nanomechanical characteristics of interfacial transition zone in nano-engineered concrete

Engineering ◽  
2021 ◽  
Author(s):  
Xinyue Wang ◽  
Sufen Dong ◽  
Zhenming Li ◽  
Baoguo Han ◽  
Jinping Ou
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone

Pore and Solid Characterizations of Interfacial Transition Zone of Mortar Using Microcomputed Tomography Images

2021 ◽  
Vol 33 (12) ◽  
pp. 04021348
Author(s):  
Sang-Yeop Chung ◽  
Ji-Su Kim ◽  
Paul H. Kamm ◽  
Dietmar Stephan ◽  
Tong-Seok Han ◽  
...  
Keyword(s):  
Transition Zone ◽  
Microcomputed Tomography ◽  
Interfacial Transition Zone

scholarly journals Fayalite Slag as Binder and Aggregate in Alkali-Activated Materials—Interfacial Transition Zone Study

Proceedings ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 1 ◽  
Author(s):  
Adediran ◽  
Yliniemi ◽  
Illikainen
Keyword(s):  
Transition Zone ◽  
Sodium Hydroxide Solution ◽  
Coal Fly Ash ◽  
Construction Materials ◽  
Fine Powder ◽  
Silicate Solution ◽  
Interfacial Transition Zone ◽  
Alkali Activation ◽  
Fayalite Slag ◽  
Alkali Activated

Alkali-activated materials (AAMs) are an environmentally friendly option for Portland cement mortars and concretes. Many industrial residues such as blast furnace slag and coal fly ash have been extensively studied and applied as AAM precursors but much less focus has been on the use of fayalite slags. Water-cooled fayalite slag comes in granular form, which is then milled into fine powder (d50 ~10 microns) prior to its alkali activation. In addition, the un-milled granular fayalite slag can be used as an aggregate to replace sand in mortar. The alkaline solution utilized for the study was a mix of 10 M sodium hydroxide solution and commercial potassium silicate solution. A liquid to solid ratio of 0.15 was held constant for all the mixes. The particle size distributions of the binder and the aggregates were optimized, and the microstructure and chemical composition of the interfacial transition zone (ITZ) was studied using scanning electron microscope coupled with energy dispersive X-ray spectroscopy. ITZ is a region that exists between the aggregate and the binder and this can influence the mechanical and transport properties of the construction materials. The results showed that the mechanical properties of mortar having fayalite slag as aggregate and binder was significantly higher than one with standard sand as aggregate. No distinct ITZ was found in the samples with fayalite slag as aggregate. The outer rim of the fayalite slag aggregate participated in the hardening reaction and this significantly contributed to the bonding and microstructural properties of the mortar samples. In contrast, an ITZ was observed in mortar samples with standard sand aggregates, which contributed to its lower strength.

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