scholarly journals Utilization of Recycled Liquid Crystal Display (LCD) Panel Waste in Concrete

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2941 ◽  
Author(s):  
Jacek Góra ◽  
Małgorzata Franus ◽  
Danuta Barnat-Hunek ◽  
Wojciech Franus
Keyword(s):  
Liquid Crystal ◽  
Transition Zone ◽  
Liquid Crystal Display ◽  
Interfacial Transition Zone ◽  
Fine Aggregate ◽  
Micro Structure ◽  
Freeze Thaw ◽  
Severe Environments ◽  
Water Tightness

The paper presents the possibility of using the liquid crystal display (LCD) waste as a partial substitute of fine aggregate. Concretes with two types of cement, CEM I 42.5 R and CEM II/B-S 42.5 N, with and without LCD addition, were investigated. The properties that influence the structures exposed to severe environments were examined. The results and analyses pertaining to their micro-structure, including interfacial transition zone (ITZ), were presented as well. All concretes exhibited good freeze–thaw (F–T) resistance after 150 F–T cycles. The water-tightness was established as 0.8 MPa. All concretes both with and without LCD achieved the same class C50/60.

Influence of Permeated Crystalline Materials on Durability of Hydraulic Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 1522-1527
Author(s):  
Ke Liang Wang ◽  
Ting Zheng Hu ◽  
Ling Liu
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Transition Zone ◽  
Test Methods ◽  
Sulfate Attack ◽  
Interfacial Transition Zone ◽  
Crystalline Materials ◽  
Freeze Thaw ◽  
Hydraulic Concrete

Influence of permeated crystalline materials on durability of hydraulic concrete was studied by impermeability test methods after sulfate attack and freeze-thaw cycling. Microstructure of concrete was analyzed and characterized with SEM and MIP. The results showed that impermeability pressure of concrete with permeated crystalline materials was more than that of standard concrete after sulfate attack and freeze-thaw cycling. Permeated crystalline materials improved on performance of concrete for sulfate attack and freeze-thaw, because that microstructure of interfacial transition zone of concrete with permeated crystalline materials was compact and its pore size distribution was more than that of standard concrete. There were more content of less harmful pore with diameter 20nm~100nm and less content of harmful pore with diameter100nm~200nm and more than 200nm in concrete with permeated crystalline materials than in standard concrete.

Microstructural damage characterization of concrete under freeze-thaw action

2017 ◽  
Vol 27 (10) ◽  
pp. 1551-1568 ◽  
Author(s):  
Q Luo ◽  
DX Liu ◽  
Pizhong Qiao ◽  
QG Feng ◽  
LZ Sun
Keyword(s):  
Computed Tomography ◽  
Transition Zone ◽  
Three Dimensional ◽  
Interfacial Transition Zone ◽  
X Ray ◽  
Freeze Thaw ◽  
Microstructural Damage ◽  
Damage Characterization ◽  
X Ray Computed ◽  
Concrete Materials

This paper conducts a quantitative analysis of microstructural damage evolution of concrete materials under freeze-thaw action using three-dimensional X-ray computed tomography. The study employs two resolution-scales to evaluate concrete samples under various cycles of freeze-thaw action. The three-dimensional microstructural damage characterization, pore network (porosity, pore size, and pore distribution) as well as the defects in the aggregates are specifically investigated. The microstructures of concrete under different freeze-thaw action show that the interfacial transition zone is most likely to be damaged first under frost attack. Furthermore, the freeze-thaw action deteriorates not only the interfacial transition zone but also cement matrix and aggregates. The impact of freeze-thaw cycles is notable on the internal micro-pores and micro-cracks of the concrete. More pores and cracks can be nucleated during the freeze-thaw action, and further accumulate and grow in the paste and aggregates, eventually leading to final failure of concrete materials. As demonstrated in this study, three-dimensional X-ray computed tomography is capable of acquiring microstructures of concrete and revealing existence of internal pores and cracks in different phases of concrete, and more effective to characterize accumulated damage of concrete due to freeze-thaw action.

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.

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