Interfacial transition zone of cement composites with steel furnace slag aggregates

2018 ◽  
Vol 86 ◽  
pp. 117-129 ◽  
Author(s):  
Alexander S. Brand ◽  
Jeffery R. Roesler
Keyword(s):  
Transition Zone ◽  
Interfacial Transition Zone ◽  
Cement Composites ◽  
Steel Furnace ◽  
Furnace Slag

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

2021 ◽  
pp. 095440972110206
Author(s):  
Guoqing Jing ◽  
Mohammad Siahkouhi ◽  
Haoyu Wang ◽  
Morteza Esmaeili
Keyword(s):  
Shear Strength ◽  
Transition Zone ◽  
Dynamic Behavior ◽  
Load Test ◽  
Plate Load Test ◽  
Shear Strength Test ◽  
Bending Modulus ◽  
Steel Furnace ◽  
Track Stiffness ◽  
Furnace Slag

Transition zones between railway tracks and bridge decks can cause higher dynamic impacts. A solution is smoothly changing the track stiffness by gradually mixing steel furnace slag into the stone ballast. A nominated bridge transition zone is divided into 5 blocks of 7 meters long, with the mixing percentages of 0%, 25%, 50%, 75% and 100%. The mechanical behaviors of furnace slag-ballast combinations (FS-BCs) were studied using experiments of shear strength test, Los Angles abrasion index and plate load test. Furthermore, the dynamic behavior of bridge transition zone with FS-BCs blocks was investigated using a field validated FEM model. Results show that the 100%, 75%, 50% and 25% furnace slag by weight of ballast can increase the shear strength and ballast layer bending modulus by 13%, 12%, 9% and 7% at speed of 300 km/h compared with those of the stone ballast. The FEM study shows that rail deflections are reduced about 20%, 14%, 21% and 16% at speed of 300 km/h corresponding to 100%, 75%, 50% and 25% FS-BCs and accelerations are significantly reduced as well as increasing FS content of each block in bridge transition zone so that a smooth bridge transition zone can be achieved.

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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