ground granulated blastfurnace slag (GGBS)

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Workability and maturity properties of ground granulated blastfurnace slag concretes

Workability and maturity properties of ground granulated blastfurnace slag concretes

At later ages the units of age were changed from hours to days, so comparison of the coefficients with those from early ages is not possible. At medium curing temperatures the standard error increases with cementitious content, having average values of approximately 3> 4.5 and 5.5 MPa, in the low, medium and high cementitious content mixes respectively. This reflects an underlying relationship between the standard deviation and magnitude of compressive strength. The values of slope and correlation coefficient in the OPC mixes were approximately half those in the GGBS mixes indicating the flattening of the compressive strength age relationships in the OPC mixes, and the sustained hydration in the GGBS mixes. At the lower curing temperatures the standard deviation decreases to levels observed in the early age data analysis. The slope and correlation coefficient are consistently higher in these analyses than at the medium curing temperatures. This difference is most apparent in the OPC mixes, where the value of the slope is more than doubled. This appears to contradict the findings others that the break in the strength-maturity relationship at high maturity values is unconnected to the cementitious blend or curing temperature ( 36 ).

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Stabilisation of Soft Soil using Ground Granulated Blastfurnace Slag and Lime

Stabilisation of Soft Soil using Ground Granulated Blastfurnace Slag and Lime

The soil collected from the site is pulverised and then sieved to conduct various tests. The binder, GGBS is added in varying percentages; 15, 20, 25. Atterberg limits, Standard Proctor Tests and unconfined compressive strength tests were conducted to arrive at the optimum GGBS content. Optimum lime content is fixed by 5% conducting Eades and Grim test. Different combinations of GGBS and Lime are mixed with soil and UCS is conducted and optimum binder mixture is fixed. The CBR test of soil mixed with optimum binder combinations were also carried out to consider the use of this method in cost effective pavement construction.

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Stabilisation of Soft Soil using Ground Granulated Blastfurnace Slag and Lime

Stabilisation of Soft Soil using Ground Granulated Blastfurnace Slag and Lime

The soil collected from the site is pulverised and then sieved to conduct various tests. The binder, GGBS is added in varying percentages; 15, 20, 25. Atterberg limits, Standard Proctor Tests and unconfined compressive strength tests were conducted to arrive at the optimum GGBS content. Optimum lime content is fixed by 5% conducting Eades and Grim test. Different combinations of GGBS and Lime are mixed with soil and UCS is conducted and optimum binder mixture is fixed. The CBR test of soil mixed with optimum binder combinations were also carried out to consider the use of this method in cost effective pavement construction.

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STRENGTH AND DURABILITY (CHLORIDE INGRESS) TRENDS OFGROUND GRANULATED BLASTFURNACE SLAG GGBS IN CONCRETE

STRENGTH AND DURABILITY (CHLORIDE INGRESS) TRENDS OFGROUND GRANULATED BLASTFURNACE SLAG GGBS IN CONCRETE

Ground granulated blastfurnace slag (GGBS) is produced during the manufacture of iron in a blastfurnace.When the rapidly cooling molten iron slag, which is an unwanted by-product from ore-smelting, is immersed in water, it produces a latent hydraulic material commonly known as the GGBS.This product is then grounded to cement fineness (Chen et al., 2012).Much less energy is required for grinding blast-furnace slag than for the production of Portland cement(Higgins, 2007).GGBS has many positive attributes associated with its use such as improved economic, durability and sustainability properties.

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Assessment of the Properties of Cement & Mortar using GGBS

Assessment of the Properties of Cement & Mortar using GGBS

During of the production of iron in a blastfurnace, iron ore and coke are heated to about 1500°C to 1600 o C. Silicate and aluminate impurities from ore and coke are combined with flux (either limestone or dolomite) which lowers the viscosity of slag. Resulting in the formation of two products namely- molten iron and molten slag. The molten slag is lighter and floats on the top of the molten iron. Molten iron is then tapped off, the remaining molten slag, which consists of mainly silicious and aluminious residue. The resulting molten slag involves cooling through high-pressure water jets. Slow cooling of slag results in the formation of unreactive crystalline material consisting of an assemblage of Ca-Al-Mg silicates. To obtain a good slag reactivity or hydraulicity, the molten slag needs to be rapidly cooled or quenched below 800 °C in order to prevent the crystallization of merwinite and melilite resulting in the formation of granular particles of diameter not more than 5 mm. The resulting granular material comprises some 95% non- crystalline calcium-alumino-silicates. Then the granulated slag, after drying, is ground to a very fine powder in the rotating ball mill, which contains some 3.6 million high chromium steel balls. The obtained grounded material is known as Ground Granulated Blastfurnace Slag (GGBS).

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Study on Behavior of M-Sand Concrete using GGBS as Filler

Study on Behavior of M-Sand Concrete using GGBS as Filler

Creating quality concrete in the present environment does not depend exclusively on achieving a high strength property. Improving the strength of the concrete to sustain a longer life span and producing a greener concrete are becoming one of the main criteria in obtaining eminence concrete. By using industrial by-products such as Ground Granulated Blast-furnace Slag (GGBS) as mineral admixture added to the Ordinary Portland Cement (OPC) in the concrete, the effect of pores in concrete which makes the concrete pathetic for making the concrete without pores by adding the GGBS as a filler material to withstand the concrete for higher strength. GGBS is a consequence formed when molten iron blast furnace slag is rapidly cooled by immersing it in water. When finely ground and mixed with OPC, it will produce obligatory properties. The production of slag is more environmentally gracious compared to the production of OPC, thus producing a more environmentally pleasant concrete than the OPC concrete. Studies done shows that adding GGBS to the cement increases the strength properties.

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Effect of Na2SiO3/Naoh on the Compressive Strength of Inorganic Polymer Concrete Mixed with Ground Granulated Blast Furnace Slag (GGBS) At Ambient Condition

Effect of Na2SiO3/Naoh on the Compressive Strength of Inorganic Polymer Concrete Mixed with Ground Granulated Blast Furnace Slag (GGBS) At Ambient Condition

Concrete tensile strength of concrete is a crucial mechanical property uses in many ways for concrete structures such as those related to beginning and propagation of cracks, shear, and concrete reinforcing steel anchorage. To determine the effect of GGBS on the geopolymer concrete, cylindrical specimens are cast. It is found that, split tensile strength gradually increased with respect to curing days increases. Fig 6 represents the tensile strength test sample and test setup. There is no much difference in tensile strength between 3, 7 and 28 days of ambient curing. The average tensile strength is 3.22 MPa for these days and there is an increment of 19.52 % for 56 days. There is further increment of 25.2 % on 90 days and 10% on 120 days. There is a correlation between the tensile strength and compressive strength. There are many empirical formulas also given by the codes like ACI Building Code 318-89 (revised 1992), and BS 8007:1987.

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Experimental Study On Self Compacting Concrete Using Ggbs

Experimental Study On Self Compacting Concrete Using Ggbs

Ground granulated blast furnace slag (GGBS), due to its pozzolanic nature, could be a great asset for the modern construction needs, because slag concretes can be of high performance, if appropriately designed. The use of GGBS as a cementitious material as well as fine filler is being increasingly advocated for the production of High performance concrete (HPC), Roller compacted concrete (RCC) and Self compacting concrete (SCC), etc. However, for obtaining the required high performance in any of these concrete composites, slag should be properly proportioned so that the resulting concrete would satisfy both the strength and performance criteria requirements of the structure. The paper is an effort towards presenting a new mix design methodology for the design of self compacting GGBS concretes based on the efficiency concept. The methodology has already been successfully verified through a proper experimental investigation and the self compacting slag concretes were evaluated for their self compactability and strength characteristics. The results indicate that the proposed method can be capable of producing high quality SCC.

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Experimental investigation of strength characteristics on Micro Level Properties of Self Compaction Concrete using  Lime Stone Powder & GGBS

Experimental investigation of strength characteristics on Micro Level Properties of Self Compaction Concrete using Lime Stone Powder & GGBS

Concrete is a composite material consisting of aggregates, binding material, water and admixtures. It is the most widely used construction material on earth. One of the major environmental concerns is the disposal of the waste materials and utilization of industrial by products. Lime stone quarries will produce millions of tons waste dust powder every year. Having considerable high degree of fineness in comparision to cement this material may be utilized as a partial replacement to cement. For this purpose an experiment is conducted to investigate the possibility of using lime stone powder in the production of SCC with combined use GGBS. This paper is a study on loss of workability, strength and property correlation between paste and concrete for various admixture and superplasticiser dosages. The mineral admixtures considered are Lime stone powder and GGBS(Ground granulated blast furnace slag) with superplasticiser Masterglenium SKY 8233.Test results shows that the SCC mix with combination of 30% GGBS and 15% limestone powder gives maximum compressive strength and fresh properties are also in the limits prescribed by the EFNARC.

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Durability Studies on Geopolymer Concrete using Ground Granulated Blast Furnace Slag (GGBS)

Durability Studies on Geopolymer Concrete using Ground Granulated Blast Furnace Slag (GGBS)

The term ‘geopolymer’ was first introduced by Davidovits in 1978 to describe a family of mineral binders with chemical composition similar to zeolites but with an amorphous microstructure. Unlike ordinary Portland/pozzolanic cements, geopolymers do not form calcium- silicate-hydrates (CSHs) for matrix formation and strength, but utilizes the polycondensation of silica and alumina precursors to attain structural strength. Two main constituents of geopolymers are: source materials and alkaline liquids. The source materials on alumino-silicate should be rich in silicon (Si) and aluminum (Al). They could be by-product materials such as fly ash, silica fume, slag, rice-husk ash, red mud, etc. Geopolymers are also unique in comparison to other aluminosilicate materials (e.g. aluminosilicate gels, glasses, and zeolites). The concentration of solids in geopolymerisation is higher than in aluminosilicate gel or zeolite synthesis. The use of this concrete helps to reduce the stock of wastes and also reduces carbon emission by reducing Portland cement demand.

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An Investigation Study on Strength & Cost Analysis of Self Compacting Concrete by Using Ggbs.

An Investigation Study on Strength & Cost Analysis of Self Compacting Concrete by Using Ggbs.

The latest trend in concrete research is to use mineral admixtures in preparing the concrete mixes. In this work, SCC prepared using the GGBS are evaluated in terms of self-compact ability, compressive strength. From the experimental investigations, the following conclusions have been drawn:

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Effect of blast furnace slag on index properties of black cotton soil

Effect of blast furnace slag on index properties of black cotton soil

Many researchers have worked on improving properties of black cotton soil with the help of GBFS, results of some are as; Ashish Kumar Pathak, et.al. (2014); Investigated the effect of GGBS on the engineering property of the soil and determine the engineering properties of the stabilized. GGBS are added from 0% to 25% by dry weight of soil. The addition of GGBS resulted in a dramatic improvement within the test ranges covered in the program. The maximum dry density increased and the optimum moisture content decreased with increasing GGBS content and at 25% we got the maximum value of dry density. Laximanth Yadu (2013); Investigated that the liquid limit and plasticity index values decrease and the plastic limit values increase with increasing GBFS content up to 50% for all the stabilized samples of both the low-plasticity and high plasticity clays. The unit weights of a particle for the stabilized clayey soil sample increases with an increase of the content of GGBFS. Thus indicates that the stabilized clayey soil sample is heavier than that of its natural conditions. Dayalan, et.al (2016); Studied the effect of stabilization of soil with GGBS and Fly Ash and found that the values of liquid limit and plastic limit decreases with increasing percentage of GGBS. The plasticity index decreases with increase in percentage of GGBS. It is concluded that the optimum value for fly ash is 15% and GGBS is 20% respectively.

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An Experimental Study on Behaviour of Concrete by Partial Replacement of Cement Using GGBS in Addition With Sisal Fibre

An Experimental Study on Behaviour of Concrete by Partial Replacement of Cement Using GGBS in Addition With Sisal Fibre

construction material in the world. The main ingredient in the conventional concrete is Portland cement. The amount of cement production emits approximately equal amount of carbon dioxide into the atmosphere. Cement production is consuming significant amount of natural resources. That has brought pressures to reduce cement consumption by the use of supplementary materials. Availability of mineral admixtures marked opening of a new era for designing concrete mix of higher and higher strength. GROUND GRANULATED BLAST FURNACE SLAG (GGBS) is a new mineral admixture, whose potential is not fully utilized. Moreover only limited studies have been carried out in India on the use of slag for the development of high strength in a concrete with addition of sisal fibres. The study focuses on the compressive strength performance of the concrete containing as a partial replacement of OPC different percentage of slag and addition of sisal fibre. The cement in concrete is replaced accordingly with the percentage of 10 %, 20%, and 30%, by weight of slag and 2% by weight of sisal fibre. Concrete cubes are tested at the age of 3, 14, and 28 days of curing. Finally, the strength performance of slag blended sisal fibre concrete is compared with the performance of conventional concrete. The ultimate compression strength and split tensile strength were obtained at 20% replacement of GGBS with 2% of sisal fibre. The flexural strength of the beam were calculated from the optimum value obtained from compression and split tensile strengths. The various comparison of test results were illustrated graphically.

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Analysis and improvement of geo -polymer concrete

Analysis and improvement of geo -polymer concrete

To reduce CO2 emissions, efforts are needed to develop environmentally friendly construction materials. This summary presents the experimental analysis and improvement of geo polymer concrete. In geopolymer concrete a by product materials rich in fly ash, chemical activated bynalkaline solution and conplast sp 430, geo polymer, ground granulated ballast furnance slag (GGBS) to form a paste that binds the loose coarse and fine aggregates are the materials is mixture the cube compressive strength was calculated for 12M solution for different mix ratio.ie) F90 G10,F70 G30 ,F50 G50(where F&G are represntively fly ash , GGBS and the numerical valve indicator the percentage of replacement of cement by FLYASH &GGBS. The maximum compressive strength of 80.50N/mm2 of mix ratio F60 G4. Also the split tensile strength and flexural strength for F60 G 40 Was done.

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Effect of GGBS on Fiber Reinforced Concrete

Effect of GGBS on Fiber Reinforced Concrete

As our aim is to develop concrete which does not only concern on the strength of concrete, it also having many other aspects to be satisfied like less porous, capillary absorption, durability. So for this we need to go for the addition of pozzolanic materials along with super plasticizer with having low water cement ratio. The use of GGBS is many, which is having good pozzolanic activity and is a good material for the production high performance concrete. Also now a days one of the great application in various structural field is fiber reinforced

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Experimental Investigation on Partial Replacement of Cement by GGBS

Experimental Investigation on Partial Replacement of Cement by GGBS

The concrete mixture with 30% GGBS achieved highest compressive, split tensile, flexure strength at end of curing day with all variations in comparison to plain concrete mixture. Hence the optimum value is achieved for 30% GGBS. The 30% replacement of cement with GGBS gives optimum result but after that the strength got slowly decreases. Compression strength of cement by the replaced GGBS concrete specimens was higher than the plain cement concrete specimens. The strength differential between the GGBS concrete specimens and plain cement concrete specimens became more distinct after 28 days. Bleeding in GGBS concrete is significantly reduced and other properties like surface finish are improved. Results of this investigation suggest that GGBS could be very conveniently used in structural concrete.

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Study on Strength and Durability Aspects of Geopolymer Concrete

Study on Strength and Durability Aspects of Geopolymer Concrete

construction industries and one of the most environmentally harmful materials. Due to environmental concerns of cement industry, there arises a strong need to make use of alternate technology which is sustainable. Geopolymer is an alternative material which can act as a binder by replacing cement. In this experimental work have analysis the strength and durability properties of fly ash and ground granulated blast furnace slag (GGBS) based geopolymer concrete and also the cost comparison with the normal concrete. The concentration of sodium hydroxide is 13 molarity(M) solutions kept a constant to prepare the mix and alkaline liquid to binder ratio as 0.40, but changing ratio of sodium hydroxide (NaOH)to Sodium silicate (Na 2 Sio 3 ) 1.50, 2.00 and 2.50. The cube compressive

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Experimental Study of GGBS with Metakaolin

Experimental Study of GGBS with Metakaolin

The mix design procedure and calculations are shown in Appendix -A. The proportions of constituent materials i.e., cementitious material (cement, fly ash and GGBS), aggregates (Coarse and Fine) and water for two grades of mixes were done and presented in tables.

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Experimental Study on Jute Yarn Reinforced Concrete with Ground Granulated Blast Furnace Slag and Silica Sand

Experimental Study on Jute Yarn Reinforced Concrete with Ground Granulated Blast Furnace Slag and Silica Sand

2.1GROUND GRANULATED BLAST FURNACE SLAG GGBS which has high pozzolonic property and it is the by- product which is obtained during the manufacturing process of pig iron. It can increase the abilities to prevent water and chloride penetration. GGBS in the cementations material it gains the strength over a long period. Results in lower heat of hydration and lower temperature rises and makes avoiding cold joints easier, but may also affect construction schedules where quick setting is required. Use of GGBS significantly reduces the risk of damages caused by alkali- silica reaction (ARS), provide higher resistance to chloride ingress, reducing the risk of reinforcement corrosion and provides higher resistance to attacks by sulphate and other chemicals.

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IMPACT OF GROUND GRANULATED BLAST FURNACE SLAG ON FRESH PROPERTIES OF SELF-COMPACTING CONCRETE

IMPACT OF GROUND GRANULATED BLAST FURNACE SLAG ON FRESH PROPERTIES OF SELF-COMPACTING CONCRETE

Abstract: As we know that in a dense reinforcement structure as well as to obtain high workable concrete without affecting any properties are difficult. Self-compacting concrete (SCC) is a type of concrete is a solution to our problem which can flow and compact by its own weight without any help of vibration effort. Due to which it can be utilized in various structures where high flow ability is required and dense reinforcement is present. In this paper we have presented impact of a waste material Ground granulated blast furnace slag (GGBS) on fresh properties of concrete by imparting it in a various proportions of 9% and 14% which is used as mineral admixtures with some amount of super plasticizers and viscosity modifying agents to create a special concrete mix design. We have carried out tests on filling & passing ability of concrete as well high resistance to segregation which include slump flow test, J ring test, V – funnel test, U – box Test, L – box test. From the study we have conclude that up to 9% of the replacement by GGBS we have got greater result after which properties are reducing on replacement of 14%. We also found that all criteria are satisfied under EFNARC guidelines for both 9% and 14% replacement by GGBS.

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