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Fig. 1, Fig. 2 show the influence of steel slag on properties of concrete at the W/B of 0.50 and 0.35, respectively. It is evident that the compressive strength of concrete is lower at higher steel slag replacement. This is consistent with the results of Sun [12] and Wang et al. [13].The early strength of concrete is more sensitive to steel slag …
Fly ash improves concrete's workability, pumpability, cohesiveness, finish, ultimate strength, and durability as well as solves many problems experienced with concrete today–and all for less cost. Fly ash, sometimes called flue ash, has been a popular supplementary cementitious material (SCM) since the mid-1900s.
Alkali-activated slag (AAS) concrete has been found to have some superior properties as compared to OPC concrete, namely, low heat of hydration, high early strength, and excellent durability in aggressive environments ( Roy and Idorn, 1982; Pu et al., 1988; Bakharev et al., 1999 ).
Arino AM and Mobasher B 1999 Effect of ground copper slag on strength and toughness of cementitious mixes ACI Materials Journal 96 68-73. Google Scholar [25.] Al-Jabri KS, Taha RA, Al-Hashmi A and Al-Harthy AS 2006 Effect of copper slag and cement by-pass dust addition on mechanical properties of concrete Construction and Building, …
The production cost of this cement is less than the Ordinary Portland Cement (OPC). Disadvantages of Blast-Furnace Slag Cement Early Strength is low; therefore, it cannot be used in Reinforced Cement Concrete (RCC) works. As the initial setting time is high, this cement is not used for emergency or repair works. Related product: Blast Furnace slag
From the experiments, it was found that zirconia silica fume is very effective in enhancing pumpability, and the increase of HRWRA dosage leads to the decrease of the viscosity of the lubricating...
This paper studies the use of wastepaper sludge ash (WPSA) for structural concrete in binary and ternary mixes with high-strength cement and two industrial by-products, ground granulated blast …
August 16, 2021. Pumpable concrete is a type of concrete that can be transported to a great height via pipes and is utilised when a large amount of concrete needs to be laid. Several factors affect the pumpability of concrete, including cementitious materials, aggregate properties, admixtures, and batching and mixing of concrete …
Slag Concrete. Also, in slag concrete, there is presence of unhydrated slag particles in the matrix—a function of slow pozzolanic reaction and filler effect. ... Shi et al. (2005) studied the effect of freeze-thaw on AAS cement pastes compared with OPC, focusing on the electrolytes of the pore solution, which may have been the cause of the ...
The chemically activated steel slag powder could improve compressive strengths, resistance to chloride permeation and water permeation, as well as …
concrete design since the early 1900s (Slag Cement Association, 2002). Slag cement is a byproduct of the iron-making process and is composed primarily of silica and calcium. In fine particle form, slag cement displays cementitious qualities similar to those of ordinary portland cement (OPC). Slag cement can therefore be substituted for OPC in a
Figure 5 shows the effect of w/c ratio and 50 % GGBS replacement on the normalized average pore size of concrete measured at 28 days of curing. In comparison, 50 % GGBS replacement at w/c ratio of 0.6 was more effective in reducing the average pore size than reducing w/c ratio from 0.6 to 0.4.
The effect, if any, on concrete strength is de- pendent on the type of mineral ad- m i x t u r e used, conditions under which the concrete is cured and the amount of admixture used . Re t a r ding and water- r educing ad- m i x t u res are sometimes used to in- …
Several factors affect the pumpability of concrete, including cementitious materials, aggregate properties, admixtures, and batching and mixing of concrete ingredients. Various cementitious ingredients, such as fly ash and silica fumes, improve the performance of pumped concrete.
The effect of slag coal ash and ed glass on the mechanical properties of two-stage concrete has rarely been reported. Thus, the development of an eco-efficient alkali-activated grout for two-stage concrete is a new research topic that has no robust results to draw solid conclusions and it should blaze the track towards a cleaner …
Employ pumping aid or water-reducing admixture. For instance, expanded shale aggregate concrete mix can be improved by increasing air content from 4% to 8% and replacing some sand with fly ash. Replace a small quantity of coarse aggregate with sand. Use a slump of 100 mm to 150 mm. If required, increase cement in the mixture to maintain this ...
The workability and durability of a type of sustainable concrete made with steel slag powder were investigated. The hydrated products of cement paste with ground granulated blast furnace slag (GGBFS) alone or with a combined admixture of GGBFS-steel slag powder were investigated by X-ray diffraction (XRD). Furthermore, the mechanism …
concrete. This research investigates the use of nickel slag as the replacement of sand in concrete. Various concrete samples were produced with the increasing nickel slag content from 0% to 50% every 10%. A water- cement-ratio of 0.35 was chosen in this study. Concrete mixes were assessed for their compressive strength …
Slag in Concrete Definition: granulated blast-furnace slag that has been finely ground and that is hydraulic cement.- ACI Concrete Terminology The use of slag in concrete has several benefits, including reduced energy, reduced greenhouse gas emissions, and reduced use of raw materials.
In this paper, we reported investigation of the influence of transportation and pumping on the properties (workability, mechanical properties, and durability) of concrete with large amounts of CUS for application in the construction of port and harbor structures. Materials and methods Materials and mix proportions
Lack and quality decrease of supplementary cementing materials (SCMs) such as fly ash and granulated blast-furnace slag is increasingly prominent in China. Thus, the use of …
This lower selfdesiccation intensity of the slag-CPB can be reasonably explained on the basis of following two factors: (i) as explained previously, slag exhibits a slower hydration reaction...
Pumping lightweight aggregate concrete is challenging due to the high water absorption of the aggregate in it which results in issues such as segregation, slump loss, inconsistent mix, etc. Therefore, engineers and contractors should consider appropriate strategies to overcome problems associated with pumping lightweight aggregate concrete.
relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the ... Pumpability of fresh concrete meant that the concrete mixtures could flow in pipes without blockage [57–59 ...
In this study, different concrete mixtures were prepared by replacing ordinary portland cement with ground granulated blast furnace slag. A polycarboxylate-ether-based superplasticizer and a cellulose-based viscosity modifying agent were used as …
Slag cement is beneficial in the workability of fresh UHPC mixes. • Slag cement reduces the early-age strength but improves the later-age strength. • Slag …
This study aims to estimate the pumpability and shootability of wet-mix shotcrete (WMS) made with crushed aggregates and various admixtures such as silica fume, fly ash, ground granulated blast furnace slag (GGBFS), metakaolin, and steel fiber based on rheological properties. The IBB rheometer was employed as an apparatus to measure the …
Abstract. 3D concrete technology has gained huge momentum in the past two decades. The enhanced geometric freedom associated with 3D concrete could be beneficial for a variety of ...