scholarly journals FUNDAMENTAL STUDY ON IMPROVEMENT MECHANISM OF RESISTANCE AGAINST CHLORIDE ION DIFFUSION OF MORTAR USING GRANULATED BLAST FURNACE SLAG FINE AGGREGATE

2019 ◽  
Vol 75 (2) ◽  
pp. 106-124
Author(s):  
Hiroshi MINAGAWA ◽  
Ryo FUJITA ◽  
Shintaro MIYAMOTO ◽  
Makoto HISADA
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Fine Aggregate ◽  
Ion Diffusion ◽  
Fundamental Study ◽  
Mechanism Of Resistance ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Diffusion ◽  
Furnace Slag

scholarly journals CHLORIDE ION DIFFUSION BEHAVIOR IN BLAST FURNACE SLAG CEMENT WITH CaO・2Al2O3

2017 ◽  
Vol 71 (1) ◽  
pp. 191-196
Author(s):  
Masataka USHIRO ◽  
Taiichiro MORI ◽  
Akihiro HORI ◽  
Minoru MORIOKA
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Ion Diffusion ◽  
Slag Cement ◽  
Diffusion Behavior ◽  
Chloride Ion Diffusion ◽  
Furnace Slag

scholarly journals Effect of Curing Condition on Resistance to Chloride Ingress in Concrete Using Ground Granulated Blast Furnace Slag

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3233 ◽  
Author(s):  
JangHyun Park ◽  
Cheol Park ◽  
SungHyung Joh ◽  
HanSeung Lee
Keyword(s):  
Compressive Strength ◽  
Diffusion Coefficient ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Ion Diffusion ◽  
Concrete Compressive Strength ◽  
Replacement Ratio ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Diffusion ◽  
Furnace Slag

Changes in the salt attack resistance of concrete using ground granulated blast furnace slag (GGBFS) were examined based on different curing conditions. These conditions were divided into air and underwater curing. Three concrete mixes with GGBFS replacement ratios of 0% (control group), 30% and 60% were fabricated. Then, evaluation of concrete compressive strength, evaluation of chloride ion diffusion coefficient and electrochemical impedance spectroscopy (EIS) were performed. As the GGBFS replacement ratio increased, the concrete compressive strength of the air cured specimens decreased compared to the underwater cured specimens. With respect to the chloride ion diffusion coefficient measurements, the coefficient decreased as the GGBFS replacement ratio increased. However, the diffusion coefficient of the air cured specimen relative to the underwater cured ones increased up to two times. The EIS results showed that as the GGBFS replacement ratio increased, |Z| increased in every frequency range. However, the |Z| of the air cured specimen was lower than the underwater cured one. This showed the same tendency as the evaluation results of the chloride ion diffusion coefficient.

scholarly journals Mechanical Behavior of Double Skinned Composite Hollow Columns using Geopolymer Concrete

2020 ◽  
Vol 8 (5) ◽  
pp. 4691-4696
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Steel Tube ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Ambient Temperatures ◽  
Granulated Blast Furnace Slag ◽  
Heat Curing ◽  
Furnace Slag

This paper comprises of the experimental study of double skinned (DSCFT) Composite hollow columns using Geopolymer concrete. The diameter-thickness (D/t) ratio and the hollowness ratio were consideredas main parameters in designing the specimens. The Geopolymer Concrete used in this project is the most promising technique. It is composed of fly-ash, fine aggregate, coarse aggregate and alkaline solution. By using large volume of ordinary Portland cement (OPC) concrete, the production of cement increases 3% annually. The production of one ton of cement directly liberates about 1 ton of CO2 and indirectly liberates 0.4 ton of CO2 to atmosphere. Among the greenhouse gases, CO2 contributes about 67% of global warming. In this respect fly ash based geopolymer mortar is highly considerable. But most of the previous works on fly ash-based geopolymers concrete reveals that hardening is due to heat curing, which is considered as a limitation for cast in situ applications at low ambient temperatures. In order to overcome this situation, replacing the Ground blast furnace slag with fly ash for various proportions to achieve geopolymer concrete suitable for curing without elevated heat. The Scope of this project is to find optimization level of Ground Granulated blast furnace slag in geopolymer concrete for curing in ambient condition and to analyze the compressive Strength of optimized GGBS based Geopolymer Concrete filled double skinned steel tube by varying the size of the steel tubes.

scholarly journals Characteristics of Mortars with Blast Furnace Slag Powder and Mixed Fine Aggregates Containing Ferronickel-Slag Aggregate

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5879
Author(s):  
Sung-Ho Bae ◽  
Jae-In Lee ◽  
Se-Jin Choi
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Steel Slag ◽  
Chloride Ion ◽  
Recycling Rate ◽  
Fine Aggregate ◽  
Fine Aggregates ◽  
Ferronickel Slag ◽  
Furnace Slag

Recently, interest in environmentally friendly development has increased worldwide, especially in the construction industry. In this study, blast furnace slag powder (BFSP) and mixed steel fine aggregates were applied to cement mortars to reduce the environmental damage caused by the extraction of natural aggregate and to increase the recycling rate of steel by-products in the construction industry. We investigated the fluidity, compressive strength, tensile strength, accelerated carbonation depth, and chloride ion penetration resistance of mortars with steel slag aggregate and their dependence on the presence or absence of BFSP. Because the recycling rate of ferronickel slag is low and causes environmental problems, we considered mortar samples with mixed fine aggregates containing blast furnace slag fine aggregate (BSA) and ferronickel slag fine aggregate (FSA). The results showed that the 7-day compressive strength of a sample containing both 25% BSA and 25% FSA was nearly 14.8% higher than that of the control sample. This trend is likely due to the high density and angular shape of steel slag particles. The 56-day compressive strength of the sample with BFSP and 50% FSA was approximately 64.9 MPa, which was higher than that of other samples with BFSP. In addition, the chloride ion penetrability test result indicates that the use of BFSP has a greater effect than the use of steel slag aggregate on the chloride ion penetration resistance of mortar. Thus, the substitute rate of steel slag as aggregate can be substantially enhanced if BFSP and steel slag aggregate are used in an appropriate combination.

scholarly journals Characteristics of Blended Geopolymer Concrete Using Ultrafine Ground Granulated Blast Furnace Slag and Copper Slag

2020 ◽  
Vol 44 (6) ◽  
pp. 433-439
Author(s):  
Vijayasarathy Rathanasalam ◽  
Jayabalan Perumalsami ◽  
Karthikeyan Jayakumar
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Blast Furnace Slag ◽  
Copper Slag ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Strength Performance ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This paper presents the properties of blended geopolymer concrete manufactured using fly ash and ultrafine Ground Granulated Blast Furnace Slag (UFGGBFS), along with the copper slag (CPS) as replacement of fine aggregate (crushed stone sand). Various parameters considered in this study include different sodium hydroxide concentrations (10M, 12M and 14M); 0.35 as alkaline liquid to binder ratio; 2.5 as sodium silicate to sodium hydroxide ratio and cured in ambient curing condition. Further, geopolymer concrete was manufactured using fly ash as the prime source material which is replaced with UFGGBFS (0%, 5%, 10% and 15%). Copper slag has been used as replacement of fine aggregate in this study. Properties of the fresh manufactured geopolymer concrete were studied by slump test. Compressive strength of the manufactured geopolymer concrete was tested and recorded after curing for 3, 7 and 28 days. Microstructure Characterization of Geopolymer concrete specimens was done by Scanning Electron Microscope (SEM) analysis. Experimental results revealed that the addition of UFGGBFS resulted in an increased strength performance of geopolymer concrete. Also, this study demonstrated that the strength of geopolymer concrete increased with an increase in sodium hydroxide concentration. SEM results revealed that the addition of UFGGBFS resulted in a dense structure.

scholarly journals Fundamental Study on Self-Restoration Characteristics of Granulated Blast Furnace Slag Focusing on a Hydration Reaction

2015 ◽  
Vol 64 (7) ◽  
pp. 573-578 ◽  
Author(s):  
Masahiro WADA ◽  
Hiroshi MATSUDA ◽  
Hiroyuki HARA ◽  
Naoyuki IGAWA ◽  
Shoya NAKAMURA
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Hydration Reaction ◽  
Fundamental Study ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

scholarly journals Replacement of Fine Aggregate by Granulated Blast Furnace Slag (GBFS) in Cement Mortar

2016 ◽  
Vol V5 (03) ◽  
Author(s):  
Aswathy M. ◽  
Sreeja P. P. ◽  
Sumana K. K. ◽  
Indu M, Dr. Jino John ◽  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cement Mortar ◽  
Fine Aggregate ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag
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