The aim of this study was to determine the effects of partial fly ash substitution in to a series of alkali-activated concrete based on a high-MgO blast furnace slag BFS. Mixes were activated with various amounts of sodium silicate at alkali modulus (mass ratio SiO2/Na2O) values of 1.0, 0.5, and 0.25. The results showed that, an increase in the fly ash content extended the initial setting time ...
effect of granulated slag as sand replacement in concrete. effect of granulated slag as sand replacement in concrete . use of blast furnace slag sand in concrete as a partial replacement for sand. effect of slag on pumpability concrete manufacturer The use of slag cement slag …
Jan 28, 2020· Factors that Impact Pumpability A wide array of factors can impact concrete pumpability, Bui notes, such as the dimension, shape, gradation, and volume of aggregates. Supplementary materials like fly ash, silica fume, slag, and limestone also influence the rheology of the mix and therefore its pumpability.
Mar 01, 2017· The effect of substitution the slag with silica fume on compressive strength and permeability of alkali activated slag concrete has been examined and analyzed in this study. The use of alkali activated slag concrete is one of the strategies for production of environmentally friendly concrete which is produced through activation of adhesion ...
Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing ...
the following effects on concrete: • Improved workability, pumpability, slump retention, and finish ability are due in part to the smooth, dense surfaces of GGBFS particles. The slag absorbs little or no water during mixing, resulting in a reduced water demand for the mix.
2001 by slag cement manufacturers and the Slag Cement Association, the American Concrete Institute officially reviewed and changed the terminology from GGBFS to slag cement (ACI Committee 233, 2004). The term slag cement will be used throughout this paper when referring to finely-ground granulated blast-furnace slag.
Feb 08, 2015· Effect of Slag Cement on Flexural Strength 0% 20% 40% 60% 80% 120% 140% 728 Flexural Strength, % of 28 day OPC Age, days OPC 50% OPC/50% Slag Cement OPC @28 days = 830 psi (5.7 MPa) Aggregate More Calcium Silicate Hydrate WCPA Annual Concrete Pavement Workshop Bruce Blair Presentation February 12, 2015 26 of 41
A c hange in the slag content in concrete has a minor effect on . its water absorption and strength properties. The addition of the slag at the level of GGBS/C=0.5 resulted in abou t . L.
Slag cement replaces as much as 50 percent in normal concrete (and up to 80 percent in special applications such as mass concrete). Fly ash is usually limited to 20 or 30 percent. Slag cement is the co-product of a controlled process, iron production, which results in a very uniform composition from source to source.
Variation in the size of Aggregates changes the water demand, cement content, micro-cracking (strength) in concrete. It also effects pumpability, and durability of concrete. Grading of aggregates depends on the proportions of coarse and fine aggregate. If grading of aggregate is varied, it also changes cement paste content (cost economy), workability of the mix,
Geopolymer binder is considered as an emerging alternative to Portland cement (OPC) for making concrete. It is principally produced by activating industrial by-products such as fly ash, blast furnace slag, and other aluminosilicate materials with alkaline reagents of molar ratio (M 2O:SiO 2) less than 0.78 (Davidovits et al. 2005).
The volumetric instability of alkali-activated slag (AAS) binders has raised concerns and impeded the acceptance of this Portland cement-free material. The objective of this article is to characterize the influence of drying rate on drying shrinkage behavior of AAS mortars to better understand the mechanisms responsible for its large shrinkage deformation.
Apr 04, 2014· Factors Affecting Workability of Concrete A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Workability is a property of freshly mixed concrete, and a concrete is a mixture of cement, aggregate, water & admixture. Due to this all the properties of concrete, whether in fresh […]
Slag cement has inappreciable effect on the capillary absorption and salt scaling. Abstract This study investigates the effects of replacing a portion of Portland cement with slag cement (0%, 25%, 50% and 65% by mass) on the properties of plain ultra-high performance concrete (UHPC) mixes.
Properties And Effects Of Copper Slag In Concrete 48 Table 2.7 Physical Properties of Coarse Aggregates, Fine Aggregates and Copper Slag Table 2.8 Chemical Analysis of Copper Slag 3 Table 2.9 Mix Proportions (Kg / m3) and Mix Ratio and tested at 7,28 and 56 days of curing in water Table 2.10 Sizes and Types of Moulds Used for ...
Effect of nickel slag as a sand replacement in strength and workability of concrete To cite this article: R S Edwin et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 615 012014 View the article online for updates and enhancements. This content was downloaded from IP address 22.214.171.124 on 15/03/2020 at 17:24
2.4. Tests of Pumpability, Shootability, and Mechanical Properties. Pumpability of fresh concrete meant that the concrete mixtures could flow in pipes without blockage [57–59]; Shootability was regarded as the ability of fresh concrete to be sprayed with suitable cohesion and adhesion [59–61].The slump value could reflect these two abilities of fresh concrete.
Effect of Ground Granulated Blast Furnace Slag as Partial Cement Replacement on Strength and Durability of Concrete: A Review Rajesh Kr. Pandey1, Abhishek Kumar2, Mohd. Afaque Khan3 1Post Graduate Student, Structural Engineering, Babu Banarasi Das University, Uttar Pradesh, India
(2014). Effect of curing temperature on setting time, strength development and microstructure of alkali activated slag cement. Materials Research Innovations: Vol. 18, CMSE-2013, pp. S2-829-S2-832.