Effect of high temperature on properties of steel slag aggregate concrete

2013 ◽  
Vol 59 ◽  
pp. 1-7 ◽  
Author(s):  
Ivanka Netinger ◽  
Damir Varevac ◽  
Dubravka Bjegović ◽  
Dragan Morić
Keyword(s):  
High Temperature ◽  
Steel Slag ◽  
Aggregate Concrete

Study of Modification of High Temperature Melting Compound Steel Slag-Fly Ash

2011 ◽  
Vol 291-294 ◽  
pp. 1851-1855
Author(s):  
Yue Long ◽  
Yan Shi ◽  
Yun Bo Lei ◽  
Hong Wei Xing ◽  
Jie Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Steel Slag ◽  
Tricalcium Silicate ◽  
Dicalcium Silicate ◽  
Experimental Result ◽  
Aggregation State ◽  
Melting Compound ◽  
Cementitious Activity ◽  
Temperature Melting

Reconstruction of high temperature melting compound steel slag-fly ash can be effectively digest f-CaO in steel slag. The experimental result shows that the f-CaO contents in modified slag is greatly affected by fly ash addition(respectively 5%, 7%, 14%) when the temperature is 1580°C and constant temperature is 30min, the digestion rates are respectively 56.99%,63.69%,68.55%. Modified mineral content of the steel slag changes greatly, mainly reflects at enormous increase in magnetite, dicalcium silicate, tricalcium silicate, wustite and vitreous. By micro-structure analysis of several kinds of modified slag mineral, tricalcium silicate mainly shape for branch of tree, dicalcium silicate is in the form of a circular, wustite and vitreous mainly distribute in aggregation state. The above minerals can increase cementitious activity for modified slag becoming cement.

Residual properties of steel slag coarse aggregate concrete after exposure to elevated temperatures

2022 ◽  
Vol 316 ◽  
pp. 125751
Author(s):  
J.C.M. Ho ◽  
Y. Liang ◽  
Y.H. Wang ◽  
M.H. Lai ◽  
Z.C. Huang ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Aggregate Concrete ◽  
Residual Properties

scholarly journals Utilization of two stage concreting method in the case of steel slag aggregate concrete

2018 ◽  
Vol 431 ◽  
pp. 082008
Author(s):  
Nguyen Khanh Son ◽  
Nguyen Trung Tin ◽  
Nguyen Ngoc Tri Huynh
Keyword(s):  
Steel Slag ◽  
Two Stage ◽  
Aggregate Concrete

scholarly journals Effects of Steel-Slag Components on Interfacial-Reaction Characteristics of Permeable Steel-Slag–Bitumen Mixture

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3885
Author(s):  
Wenhuan Liu ◽  
Hui Li ◽  
Huimei Zhu ◽  
Pinjing Xu
Keyword(s):  
High Temperature ◽  
Calcium Oxide ◽  
Chemical Reaction ◽  
Interfacial Adhesion ◽  
Chemical Interaction ◽  
Steel Slag ◽  
Tricalcium Silicate ◽  
Enhancement Effect ◽  
Mixture Ratio ◽  
Ft Ir

In this paper, a permeable steel-slag–bitumen mixture (PSSBM) was first prepared according to the designed mixture ratio. Then, the interaction characteristics between steel slag and bitumen were studied. The chemical interaction between bitumen and steel slag was explored with a Fourier-transform infrared spectrometer (FT-IR). The influence of steel-slag chemistry, mineral composition, and bitumen reaction on phase angle, complex shear modulus (CSM), and rutting factor was explored with dynamic shear rheological (DSR) tests. The PSSBM had better properties, including high permeability, water stability, Marshall stability, high-temperature (HT) stability, and low volume-expansion rate. Bitumen-coated steel slag can prevent heavy-metal ions from leaching. In the infrared spectra of the mixture of a chemical component of steel slag (calcium oxide) and bitumen, a new absorption peak at 3645 cm−1 was ascribed to the SiO–H stretching vibration, indicating that new organic silicon compounds were produced in the chemical reaction between calcium oxide and bitumen. SiO–H had an obvious enhancement effect on the interfacial adhesion and high-temperature rheological property of the mixture. In the mineral components of steel slag, dicalcium and tricalcium silicate reacted with bitumen and generated new substances. Chemical reactions between tricalcium silicate and bitumen were significant and had obvious enhancement effects on interfacial adhesion and high-temperature rheological properties of the mixture. The results of FT-IR and DSR were basically consistent, which revealed the chemical-reaction mechanism between steel-slag microcomponents and bitumen at the interface. SEM results showed that pits and grooves on the surface of the steel-slag aggregate, and the textural characteristics provide a framework-like function, thus strengthening the strength and adhesion of the steel-slag–bitumen aggregate interface.

scholarly journals Characterization of Supplementary Cementitious Materials and Fibers to Be Implemented in High Temperature Concretes for Thermal Energy Storage (TES) Application

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5190
Author(s):  
Laura Boquera ◽  
David Pons ◽  
Ana Inés Fernández ◽  
Luisa F. Cabeza
Keyword(s):  
Tensile Strength ◽  
Blast Furnace ◽  
High Temperature ◽  
Blast Furnace Slag ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Iron Silicate ◽  
Supplementary Cementitious Materials ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Six supplementary cementitious materials (SCMs) were identified to be incorporated in concrete exposed to high-temperature cycling conditions within the thermal energy storage literature. The selected SCMs are bauxite, chamotte, ground granulated blast furnace slag, iron silicate, silica fume, and steel slag. A microstructural characterization was carried out through an optical microscope, X-ray diffraction analysis, and FT-IR. Also, a pozzolanic test was performed to study the reaction of SCMs silico-aluminous components. The formation of calcium silica hydrate was observed in all SCMs pozzolanic test. Steel slag, iron silicate, and ground granulated blast furnace slag required further milling to enhance cement reaction. Moreover, the tensile strength of three fibers (polypropylene, steel, and glass fibers) was tested after exposure to an alkalinity environment at ambient temperature during one and three months. Results show an alkaline environment entails a tensile strength decrease in polypropylene and steel fibers, leading to corrosion in the later ones.

Microscopic Analysis and Experimental Research on Thermal Mechanical Behavior of Natural Aggregate Concrete

2010 ◽  
Vol 129-131 ◽  
pp. 1039-1042
Author(s):  
H.Q. Yan ◽  
Q.Y. Wang
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Microscopic Analysis ◽  
Test Methods ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Strength Analysis ◽  
Aggregate Concrete ◽  
Natural Aggregate

Reinforced concrete construction is very common recently and extensively used both in industrial and commercial buildings. With the gradual rise in occurrences of fire accidents in recent years, a more thorough and quantitative understanding of the damage phenomenon in concrete structures is required. However, the mechanical behavior of concrete could actually be more complex under high temperature conditions than at room temperature. Restoration and reinforcement of the structures exposed to fire may have to be based on residual strength analysis and therefore require a correlation between temperature and mechanical properties. Thus, in order to meet the modern challenges of rapid engineering advances and societal development, further research on the concrete material and its structural behavior at high temperatures becomes extremely important. The present paper deals with investigations on the effect of high temperature exposure on the compressive strength of natural aggregate concrete. Experiments were conducted to study the compressive strength variations with increasing temperatures, up to 700 °C, and the subsequent cooling modes such as natural and spray cooling. Results show that the compressive strength gradually decreases with increasing temperatures. And micro-structural observations of the concrete specimens by means of scanning electron microscopy (SEM) were obtained. These test methods and results can be used for analyzing and investigating the behavior of recycled aggregate concrete with increasing temperatures.

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