Effect of Pre-Immersion of Slag in Water and Fly Ash as
For a 1-h immersion of 2.5% slag in water, highest compressive strength was determined. The maximum value at 2.5% slag immersion for a period of 1 h was fixed, …
Sustainability | Free Full-Text | Impact of Climate Change on the
Fly ash and slag have been widely used to produce low-CO2 concrete. However, previous studies have not paid enough attention to the lower carbonation resistance of fly-ash-and-slag-blended concrete and the aggravations of carbonation due to climate change. This study proposes a technique for the design of fly-ash-and-slag …
Chapter 1
Coarse ash particles, referred to as bottom ash or slag, fall to the bottom of the combustion chamber, while the lighter fine ash particles, termed fly ash, remain suspended in the flue gas. Prior to exhausting the flue gas, fly ash is removed by particulate emission control devices, such as electrostatic precipitators or filter fabric ...
Effects of water content, water type and temperature on the …
The yield stress of CPB that is mixed with FA (FA-CPB) mainly contribute to the particle-to-particle network through colloidal interaction, and hence the workability of cemented paste backfill prepared with fly ash (FA-CPB) is more sensitive to water content [22]. MC is a slag-blended cement that mainly consists of ground-granulated blast ...
Materials | Free Full-Text | Mechanical Properties and
The objective of this study was to reduce the stockpile of steel slag, which is a solid waste generated in the steelmaking process, and promote the resource utilization of steel slag powder (SSP) in construction projects. Experimental research was conducted on SSP and fly ash (FA) as supplementary cementitious materials. Composite cement …
Sulphuric Acid Resistance of Slag Geopolymer Concrete Modified with Fly
This work is an experimental study on sulphuric acid resistance of geopolymer concrete. The main variables considered throughout the research program were fly ash content from 0.0 to 40% and silica fume content as replacement of quenched slag in addition to sodium hydroxide molarity and added water content. These variables …
Effect of water to cement ratio, fly ash, and slag on the
When the slag content is increased to 1.8, the EMI SE reduces to the lowest value out of the three mixes. Other two mixes with W/C ratios of 0.4 and 0.5 both show that the EMI SE is lowest when the slag content is increased to 1.8. The SE of mix with a W/C ratio of 0.4 and slag content of 1.2 and 1.5 show near-identical behaviour.
Fly ash for sustainable construction: A review of fly ash concrete …
Fly ash concrete can perform better against chloride, sulfate and acid attacks and can improve corrosion resistance. ... The use of 30 % class F FA in concrete with Ferronickel slag (FNS) as a sand replacement caused a reduction in CS. ... SCC showed increased water permeability as FA content increased (Turk et al., 2013, Khatib, 2008).
Research on the Pavement Performance of Slag/Fly Ash-Based …
The substitution of slag-based geopolymer materials for cement-stabilized macadam in road bases is in line with the demand for green and sustainable development in the transportation industry. Thus, slag/fly-ash-based geopolymer materials were prepared to stabilize macadam of road bases in this study. The mechanical properties, freeze-thaw …
Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag
The infrared spectra of the fly ash and slag powders and hardened geo-polymeric samples manufactured with a 60/40% fly ash/slag blend and cured at room temperature after 14 and 28 days are shown in Figure 2b. In unreacted fly ash and slag powders, the maximum value of the broad peak was about 1042 cm −1 and 926 cm −1, …
Predicting the Compressive Strength of the Cement-Fly Ash–Slag …
When the content of fly ash exceeds 10%, this effect is weakened, and when the expansion agent and fly ash are mixed into concrete at the same time, the original fly ash must be used . Jang et al. studied the influence of the water–binder ratio and fly ash content on concrete durability, and the research results showed that the …
Ash
Compressive strength of lightweight masonry block with 0–4 mm volcanic slag aggregate and cement with 20% fly ash replacement ... shrinkage character to metakaolin geopolymers though the magnitude of the shrinkage is typically less due to the lower water content used to process fly ash geopolymers [5, 7, 11, 13]. The other difference in the ...
Compressive Strength and Elastic Modulus of Concretes with Fly Ash and Slag
This paper presents the evolution of compressive strength and the modulus of elasticity of concretes with binary and ternary blends of ordinary Portland cement, fly ash and ground granulated blast-furnace slag (GGBS or slag). The study involved 54 concrete mixes with water–binder ratio (w/b) varying from 0.50 to 0.65 and the total binder …
Comparative Analysis of Heat Release, Bound Water Content and
Different slag and fly ash proportions are studied at two different solution-to-binder (S/B) ratios. Alkali solutions are made with 5 M NaOH and water glass to have a final silica modulus of 1.28.
Modeling the hydration of concrete incorporating fly ash or slag
In this paper, a kinetic model is proposed to describe the hydration process of concrete containing fly ash or slag. By considering the production of calcium …
Fly ash properties, characterization, and applications: A review
Moreover, the density of the fly ash can be determined from iron and carbon content. Thus, when the C content increase in FA, its density decrease, and the more …
Properties of concrete mixtures containing slag cement and fly …
The research sponsor specified Class C fly ash and Grade 120 slag cement. A commercial air-entraining agent (AEA) was used to attain the targeted total air content …
Experimental Investigation and Mechanism of Fly Ash/Slag …
In response to the high carbon emissions and energy consumption of traditional cement curing agents, in this paper, we propose a fly ash/slag-based geopolymer as an alternative to cement for stabilizing soft soils. In this study, the effects of the activator modulus, activator, and slag content on the geopolymer-stabilized clay …
Study of the hydration of Portland cement blended with blast …
Bound water content of cement paste containing 0, 30, 50 and 85% BFS in function of age ... Table 3 Volume fraction/% of cement, slag and pore water in the original samples (0 days) according to the slag-to-binder ratio ... De Schutter G, De Belie N. Reactivity of fly ash in cement paste studied by means of thermogravimetry and …
Compressive strength development and shrinkage of alkali-activated fly
The fly ash/slag blends with 0, 25, 50, 75 and 100 wt% slag were dry-mixed for 5 min using a cement paste mixer and then mixed with the alkaline activating solution at a liquid to solid mass ratio (l/s) of 0.42.
Repair of ordinary Portland cement concrete using alkali activated slag
The ordinary Portland cement (P.O 42.5) with a specific surface area of 345 m 2 /kg and a density of 3.15 g/cm 3 was used, which was provided by Shijiazhuang Quzhai cement co. LTD. Slag and fly ash were produced in Lingshou, Shijiazhuang. The slag with a specific surface area 455 m 2 /kg and a density of 2.82 g/cm 3 was classified as S105 …
What Is Fly Ash and How Is It Used in Concrete?
Using fly ash in concrete reduces cracking, permeability, and bleeding, creating a dense, high-durability concrete that is resistant to sulphates and alkali-aggregate reactions. This concrete mix also requires less water and has a tendency to resist shrinking. However, using fly ash in concrete does come with potential problems.
Influence of added water and fly ash content on the …
Increasing added water resulted in increasing absorption and decreasing crack counts in concrete. Increasing fly ash contents resulted in increasing absorption …
Performance and microstructure of sustainable
Incorporating slag and fly ash into sludge ash greatly enhanced the strength and durability of sludge ash cementitious materials, improving its resistance to water absorption and chloride migration. The mixes with 20 % sludge ash and 10 % slag also achieved 10 % higher strength than mixes containing 30 % sludge ash, with the 28 …
Optimal Design of the Cement, Fly Ash, and Slag Mixture in …
Based on the experimental results on slump and the GEP method, we performed a regression on the concrete's slump as a function of the water–to–binder …
Multi-Objective Optimization of Sustainable Concrete …
Substantial research has been conducted to evaluate using various supplementary cementitious materials (SCMs) such as fly ash (FA), slag, metakaolin, rice husk ash (RHA), silica fume (SF), and natural …
CONCRETE Optimizing the Use of Fly Ash in Concrete
calcium content of the fly ash as shown in Table 3. The calcium content of the fly ash is perhaps the best indicator of how the fly ash will behave in concrete (Thomas 1999), although other compounds such as the alkalis (Na 2 O and K 2 O), carbon (usually measured as LOI), and sulfate (SO 3) can also affect the performance of the fly ash.
Mechanical Properties and Microscopic Study of Steel Slag–Fly Ash
Therefore, for the test, the required mass ratio of fly ash to steel slag in the geopolymer is 2:1, the dosage of water glass solution is 20% of the geopolymer mass, and the water glass solution has a modulus of 1.2 and a Baume degree of 30 Be'/(g·cm −3). The blending amount of geopolymer refers to the ratio of the total mass of the sample ...
Properties of concrete mixtures containing slag cement and fly …
They found a delay in hydration as the slag and/or fly ash content increased. ... using constant water to cement (w/c) ratios of 0.45, 0.50 and 0.55 and cement …
Engineering performance of high-content MgO-Alkali-activated slag
This research investigated the effects of recycled fine aggregate (RFA) and fly ash (FA) content on the strength development and engineering properties of alkali-activated slag–MgO (AASM) mortar. Various mortar specimens in which natural sand was replaced by RFA in five ratios (0:100, 25:75, 50:50, 75:25, and 100:0) and 0%, 15%, …