scholarly journals Experimental Investigation on Waste Utilization of Steel fiber and SCBA in Concrete with Partially Replacement of Cement

2021 ◽  
Vol 9 (12) ◽  
pp. 1048-1051
Author(s):  
Somesh Verma
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
High Strength ◽  
Current Method ◽  
Waste Utilization ◽  
Conventional Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Abstract: This work presents the determination of the mechanical properties (compression, split tensile and flexural) of the specimens (cubes, cylinders and beams). The test specimens are M60 high strength concrete which includes ground granulated blast furnace slag (0%,10%, 20%, 30% and 40%) and fly ash (0% 10%, 20%, 30% and 40%) to obtain the desired resistances and properties. Finally, we used granulated blast furnace in different percentages as cement and concrete were replaced. We prepared concrete cubes, beams and cylinders and stored them for a 28-day cure. The tests are performed after 7, 21 and 28 days. To achieve the desired strength that cannot be achieved with conventional concrete and the current method, a large number of test mixtures with different percentages of fly ash and different percentages of ground granulated blast furnace slag are needed to select the combination of materials. Keywords: Fly Ash (FA), Ground Granulated Blast Furnace Slag (GGBS), Compressive strength, Tensile strength, Flexural strength, Ordinary Portland Cement (OPC)

scholarly journals Domınance of materıal composıtıon on mechanıcal propertıes of normal and hıgh strength grade bınary blended geopolymer concrete

2020 ◽  
Vol 2 (3) ◽  
pp. 128-133
Author(s):  
Addepalli Mallinadh Kashyap ◽  
Tanimki Chandra Sekhar Rao ◽  
N.V.Ramana Rao
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
High Strength ◽  
Geopolymer Concrete ◽  
Green House Gases ◽  
Green House ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

The utilisation of pozzolanic materials as the replacement to conventional cement material have the potentiality to mitigate the pollution caused by the émission of carbon based green house gases which are a main source for global warming problem. For every production of 1 ton of cement it was approximated that the emission of carbon based green house gases are about 1 ton. Keeping this in view, a new material called Geopolymer which was first coined by Davidovits has gained a lot of interest by the researchers. In this study, different molarity variations of NaOH in the order of 4M, 6M, 8M, 10M, 12M and 14M and also the blending of  mineral admixtures like Fly Ash and Ground Granulated Blast Furnace Slag with percentages (50%+50%) and the mechanical properties of normal M30 and high strength grade M70 binary blended Geopolymer concrete were studied after 28 days of ambient curing and were reported. The test results revealed that the effect of molar concentration of NaOH at 12 M is effective and the optimum replacement of mineral composition of source materials is (50%+50%) fly ash and ground granulated blast furnace slag.  

scholarly journals Development of Alkaline Activated High Strength Concrete using Fly Ash - Ground Granulated Blast Furnace Slag - Metakaolin as Binders and Manufacturing Sand as Fine Aggregate

2020 ◽  
Vol 9 (4) ◽  
pp. 903-911 ◽  
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
High Strength Concrete ◽  
Blast Furnace Slag ◽  
High Strength ◽  
Fine Aggregate ◽  
Cement Concrete ◽  
Strength Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Structures built with normal concrete are fading out from the construction industry due to the development of high strength concrete. The massive structures such as sky scrapers, bridges, tunnels, nuclear plants, underground structures need high strength concrete to withstand the high intensity vertical, horizontal and moving loads etc. The development of high strength alkaline activated concrete will reduce the usage of cement in construction community. Lesser the utilisation of cement will lessen the high emission of carbon dioxide gas into the atmosphere. In this study, high strength concrete using alumina and silica rich materials are made with a mix ratio of 1:1.31:2.22. The water to cement ratio for high strength cement concrete and the alkaline solution to binder ratio for alkaline activated concrete are kept as 0.35. Low calcium fly ash, Ground Granulated Blast Furnace Slag (GGBS) and Metakaolin are used as binders and Manufacturing Sand is used as fine aggregate to made high strength alkaline activated concrete. The high strength alkaline activated concrete tests results are better than the high strength cement concrete.

scholarly journals Properties of Concrete Made with Low-Emission Cements CEM II/C-M and CEM VI

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2257 ◽  
Author(s):  
Anna Król ◽  
Zbigniew Giergiczny ◽  
Justyna Kuterasińska-Warwas
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
High Strength ◽  
Necessary Condition ◽  
Granulated Blast Furnace Slag ◽  
Low Emission ◽  
Main Components ◽  
Furnace Slag

The paper presents the composition and properties of low-emission ternary cements: Portland multicomponent cement CEM II/C-M and multicomponent cement CEM VI. In the ternary cements, Portland clinker was replaced at the levels of 40% and 55% with a mixture of the main components such as limestone (LL), granulated blast furnace slag (S) and siliceous fly ash (V). Portland multicomponent cements CEM II/C-M and CEM VI are low-emission binders with CO2 emissions ranging from 340 (CEM VI) kg to 453 (CEM II/C-M) kg per Mg of cement. The results obtained indicate the possibility of a wider use of ground limestone (LL) in cement composition. This is important in the case of limited market availability of fly ash and granulated blast furnace slag. The tests conducted on concrete have shown that the necessary condition for obtaining a high strength class and durability of concrete from CEM II/C-M and CEM VI ternary cements is low water–cement ratio. Durability characteristics of concrete (carbonation susceptibility, chloride ion permeation, frost resistance) made of CEM II/C-M and CEM VI cements were determined after 90 days of hardening. This period of curing reflects the performance properties of the concrete in a more effective way.

scholarly journals COST ANALYSIS OF GEOPOLYMER CONCRETE OVER CONVENTIONAL CONCRETE

2020 ◽  
Author(s):  
B. Rajini ◽  
A.V. Narasimha Rao ◽  
C.Sashidhar
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Molar Ratio ◽  
Conventional Concrete ◽  
Granulated Blast Furnace Slag ◽  
Ambient Room Temperature ◽  
Key Factor ◽  
Naoh Solution ◽  
Furnace Slag

Now a days concrete is one of the widely used constructuction materials inconstruction industry.Portland cement is the main constituent for making concrete.Geopolymer can be consider as the key factor which does not utilize Portland cement,nor releases greenhouse gases.the geopolymer technology proposed byDavidovits(1978) shows considerable promise for application in concrete industry asan alternative binder to the Portland cement.He proposed that binders could beproposed by a polymeric reaction of alkaline liquids with the silicon and the aluminiumin source materials of geopolymer origin or by-product materials such as FlyAsh,Ground Granulated blast furnace slag ,Rice-Husk Ash etc.He termed these binderas geopolymers. Among the waste or by-product materials,Fly Ash and Slag are themost potential source of geopolymers.The objective of this project is to study the effect of class Fly Ash (FA) and GroundGranulated Blast Furnace Slag (GGBS) on the micro properties of geopolymerconcrete (GPC) at different replacement levels (FA0-GGBS100, FA25-GGBS75, FA50-GGBS50, FA75-GGBS25, FA100-GGBS0)). Sodium silicate (Na2SiO3) and sodiumhydroxide (NaOH) solution will be used as alkaline activators. The molar ratio ofhydroxide solution considered in the investigation is 10M. The result shows that themechanical decrease with increase in FA content in the mix irrespective of differentcuring periods like 7, 28, 56 and 90 days at ambient room temperature

scholarly journals Effect of Mineral Admixtures on the Performance of Low-Quality Recycled Aggregate Concrete

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 596
Author(s):  
Yasuhiro Dosho
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mineral Admixtures ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate and using appropriate mineral admixtures such as fly ash and ground granulated blast-furnace slag. The results show the potential for the use of low-quality aggregate in structural concrete.

Effects of Fly Ash and Granular Blast-Furnace Slag on Development Rate of Strength of Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 371-375
Author(s):  
Ji Wei Cai ◽  
Si Jia Yan ◽  
Gong Lei Wei ◽  
Lu Wang ◽  
Jin Jin Zhou
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Development Rate ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Conventional Concrete ◽  
Enhancing Effect ◽  
Substitution Content ◽  
Furnace Slag

Fly ash (FA) and granular blast-furnace slag (GBFS) are usual mineral admixtures to conventional concrete, and their contents substituted for Portland cement definitely affect development rate of strength of concrete. C30 and C60 concrete samples with FA and/or GBFS were prepared to study the influence of substitution content of the mineral admixtures on 3 d, 7 d and 28 d strength. The results reveal that the development rate of strength in period from 3 d to 7 d gets slow with increasing content of mineral admixtures except for concrete with only GBFS less than 20%. In the case of substituting FA as the only mineral admixture for part of cement, the development rate of strength of C30 concrete in period from 7 d to 28 d keeps roughly constant even that of C60 concrete increases. When substituting mineral admixtures in the presence of GBFS for cement within experimental range, the development rate of strength in period from 7 d to 28 d gets fast with increasing substitution content. The enhancing effect of combining FA and GBFS occurs in period from 7 d to 28 d for both C30 and C60 concretes (FA+GBFS≤40%), even occurs in period from 3 d to 7 d for C60 concrete. Based on 7 d strength and the development rate, 28 d strength of concrete can be predicted accurately.

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