Sulfate resistance of self compacting concrete incorporating copper slag as fine aggregates with mineral admixtures

2021 ◽  
Vol 287 ◽  
pp. 122985
Author(s):  
Rahul Sharma ◽  
Rizwan A. Khan

From recent global research developments, lot of natural and artificial materials are coming from industries those are normally discarded or used as landfills are investigated for potential construction applications. There are different industry waste materials like steel slag, copper slag, electric furnace slag etc., which are used in various types of concretes such as conventional, geo-polymer self-compacting concretes. Now a day’s utilization of Self- Compacting Concrete (SCC) is increasing speedily because of its attractive characteristics like effective fresh, mechanical and durability properties and its large applications in construction. In addition to this, SCC materials are associated with sustainability issues. Necessity of SCC expected to continuously increases with increasing developments around the world. Therefore required an ideal solution and sustain technology; such as utilization of alternative materials. The present study explains application of industrial waste materials to replace fine and coarse aggregates in self-compacting concrete production. Also, effective limitations in using some of the waste materials as sustainable alternatives for coarse and fine aggregates have been mentioned. From this review, it is evident that factors like carbon emissions, energy for production and cost production of SCC can be notably decreased by incorporating of waste materials in place of fine and coarse aggregates in Self-Compacting Concrete.


The principle target of the study is to evaluate the probability of using nano silica as cement replacement materials and copper slag as fragmented fine aggregate in Self- compacting concrete. The degree of the present study joins the examination of convenience, mechanical and quality properties of Self-compacting concrete combining distinctive replacement levels of above materials. Nano silica is another mineral admixture with particle size in the Nano metric range and high express surface region. Its potential points of interest in cement based materials are not totally recognized in light of limited asks about in the field of Nano fabricated cementations composites. Concrete with suitably dissipated Nano silica of perfect sum realizes incredible quality and solidness properties. Use of mineral admixtures reduces the measure of cement for concrete generation which, accordingly, diminishes the outpouring of CO2 into the air. The degree of Nano silica replacement is 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% by weight of cement. A relentless water-spread ratio of 0.31 is gotten for all the concrete mixes. The usefulness of SCC mixes are kept up in the hang extent of 25 – 50 mm by fluctuating the substance of super plasticizer. The perfect measure of Nano silica, is managed by coordinating usefulness, mechanical and strength tests. Nano silica improves the early nature of concrete on account of its high Pozzolanic reactivity. Extension of Nano silica improves the quality at 1 – 3 days of calming. This is credited to the high unequivocal surface zone of Nano silica


Author(s):  
Rizwan Ahmad Khan ◽  

This paper investigates the fresh and durability properties of the high-performance concrete by replacing cement with 15% Silica fume and simultaneously replacing fine aggregates with 25%, 50%, 75% and 100% copper slag at w/b ratio of 0.23. Five mixes were analysed and compared with the standard concrete mix. Fresh properties show an increase in the slump with the increase in the quantity of copper slag to the mix. Sorptivity, chloride penetration, UPV and carbonation results were very encouraging at 50% copper slag replacement levels. Microstructure analysis of these mixes shows the emergence of C-S-H gel for nearly all mixes indicating densification of the interfacial transition zone of the concrete.


Author(s):  
S. Dey ◽  
V. V. Praveen Kumar ◽  
K. R. Goud ◽  
S. K. J. Basha

Silicon ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1779-1785 ◽  
Author(s):  
P. O. Awoyera ◽  
I. I. Akinwumi ◽  
V. Karthika ◽  
R. Gobinath ◽  
R. Gunasekaran ◽  
...  

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