scholarly journals Flexural and Shear Behaviors of Reinforced Alkali-Activated Slag Concrete Beams

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Kwang-Myong Lee ◽  
Sung Choi ◽  
Jinkyo F. Choo ◽  
Young-Cheol Choi ◽  
Sung-Won Yoo
Keyword(s):  
Material Properties ◽  
Concrete Beams ◽  
Cement Industry ◽  
Reinforced Concrete Beams ◽  
Element Analysis ◽  
Alkali Activated Slag ◽  
Concrete Members ◽  
Activated Slag ◽  
Shear Behaviors ◽  
Alkali Activated

The material properties of cement-zero concrete using alkali-activators have been studied extensively as the latest response to reduce the CO2 exhaust of the cement industry. However, it is also critical to evaluate the behavior of reinforced concrete beams made of alkali-activated slag (AAS) concrete in terms of flexure and shear to promote the applicability of AAS concrete as structural material. Accordingly, nine types of beam specimens with various ratios of tensile steel and stirrup were fabricated and subject to bending and shear tests. The results show that the flexural and shear behaviors of the reinforced AAS concrete members are practically similar to those made of normal concrete and indicate the applicability of the conventional design code given that the lower density of slag is considered. In addition, a framework using the elastic modulus and stress-strain relation from earlier research is adopted to carry out nonlinear finite element analysis reflecting the material properties of AAS concrete. The numerical results exhibit good agreement with the experimental results and demonstrate the validity of the analytical model.

Flexural behavior of alkali-activated slag-based concrete beams

2021 ◽  
Vol 229 ◽  
pp. 111644
Author(s):  
Yunxing Du ◽  
Jia Wang ◽  
Caijun Shi ◽  
Hyeon-Jong Hwang ◽  
Ning Li
Keyword(s):  
Concrete Beams ◽  
Flexural Behavior ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Influence of Untreated Metal Waste from 3D Printing on Electrical Properties of Alkali-Activated Slag Mortars

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8178
Author(s):  
Lukáš Fiala ◽  
Michaela Petříková ◽  
Martin Keppert ◽  
Martin Böhm ◽  
Jaroslav Pokorný ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
3D Printing ◽  
Metal Powder ◽  
Material Properties ◽  
Nickel Content ◽  
Alkali Activated Slag ◽  
Self Heating ◽  
Activated Slag ◽  
Alkali Activated

The negative environmental impact of cement production emphasizes the need to use alternative binders for construction materials. Alkali-activated slag is a more environmentally friendly candidate which can be utilized in the design of mortars with favorable material properties. However, the electrical properties of such materials are generally poor and need to be optimized by various metallic or carbon-based admixtures to gain new sophisticated material functions, such as self-sensing, self-heating, or energy harvesting. This paper investigates the influence of waste metal powder originating from the 3D printing process on the material properties of alkali-activated slag mortars. The untreated metal powder was characterized by means of XRD and SEM/EDS analyses revealing high nickel content, which was promising in terms of gaining self-heating function due to the high electrical conductivity and stability of nickel in a highly alkaline environment. The designed mortars with the waste metal admixture in the amount up to 250 wt.% to the slag and aggregates were then characterized in terms of basic physical, thermal, and electrical properties. Compared to the reference mortar, the designed mortars were of increased porosity of 17–32%. The thermal conductivity of ~1–1.1 W/m·K was at a favorable level for self-heating. However, the electrical conductivity of ~10−6 S/m was insufficient to allow the generation of the Joule heat. Even though a high amount of 3D printing waste could be used due to the good workability of mixtures, its additional treatment will be necessary to achieve reasonable, effective electrical conductivity of mortars resulting in self-heating function.

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