Creep characterisation and microstructural analysis of municipal …
The MSWI fly ash and slag were mixed at a ratio of 2:3, and 3% of the modified water glass was mixed with the alkali equivalent as the calculation standard, where the water glass modulus was 1.
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Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and …
2.2. Specimen Preparation. As shown in Table 3, a control group (C0) and four variable groups (C1, C2, C3, and C4) were established.In all five groups, the amount of fine coal gangue was 285 kg/m 3, the amount of coarse coal gangue was 665 kg/m 3, and the amount of fly ash was 380 kg/m 3.The amount of cement in the control group (C0) was 190 kg/m 3, and, …
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Properties of Fly Ash-Extended Asphalt Concrete Mixes
of fly ash in asphalt concrete mixes has been investigated. Three sizes of fly ash (coarse, medium, and fine) were used. The effect of these fly ash sizes on the resilient modulus, rutting potential, and water resistance of these mixes was investigated. It was found that the medium-size fly ash was the best size for an asphalt extender.
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Examining the endpoint impacts, challenges, and opportunities of …
More than 90% of the total impact of concrete contributes to damage to human health, primarily caused by global warming and fine particulate matter. The use of fly ash at 20% replacement …
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Synergistic effect of calcined clay and fly ash on the performance …
Supplementary cementitious materials (SCMs), such as fly ash (FA), granulated blast furnace slag, silica fume, calcined clay (CC), calcined shale, and metakaolin, have gained attention for their potential to reduce the environmental impact of concrete, improve its properties, and reduce its pH [2], [11].However, recent studies have shown that the quantities of …
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Coal Ash: Hazardous to Human Health
It includes fly ash (fine powdery particles that are carried up the smoke stack and captured by pollution control devices) as well as coarser materials that fall to the bottom of the furnace. ... toxic sludge, destroying three homes and contaminating the Emory and Clinch Rivers. xi. When the EPA tested water samples after the spill, they found ...
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EFFECTS OF FLY ASH ON CONCRETE …
The permeability of concrete reduces on addition of fly ash to cement. 28 days pulverised fly-ash-concrete may be three times as permeable …
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Effects of w/b ratio, fly ash, limestone calcined clay, seawater and
After 28 d or 90 d or even longer, the mechanical strength of fly ash concrete is equivalent to that of ordinary concrete, and may even exceed that of ordinary concrete [26]. At the same time, adding fly ash can reduce CO 2 emissions and consumption of raw materials during concrete production [28], [29]. However, the impact of fly ash on SSC is ...
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Effect of fly ash on the pore structure of cement paste under a …
The fly ash is a low-calcium fly ash (Class F fly ash). Table 1 shows the chemical composition of the Portland cement and fly ash as determined by X-ray fluorescence (XRF) spectrometry method. The mineral composition of Portland cement is calculated with the Bogue equation [9], as C 3 S (67.1%), C 2 S (5.9%), C 3 A (7.8%) and C 4 AF (9.6%).
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Effect of Fly Ash as Cement Replacement on Chloride Diffusion …
The effect of fly ash on chloride transportation, diffusion, coefficient, free chloride content, and binding chloride content were quantified, and the concrete porosity and microstructure were also reported through mercury intrusion perimetry and scanning electron microscopy, respectively. ... This is because fly ash has three main effects on ...
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Effects of the Loss on Ignition of Fly Ash on the Properties of High
This study presents the experimental results of fresh and hardened properties of concrete incorporating high-volume fly ash (HVFA). Two kinds of low-calcium fly ash with loss on ignition (LOI) of 5% and 8% were used as replacement for cement and/or fine aggregate of 0% (control), 20%, 40%, 50%, 60% and 80% by weight of the total cementitious materials. The …
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The effects of hardening accelerator on microstructure and …
Effect of hardening accelerators on fly ash-cement-based materials hydration. 5. ... This paper used the BBD method within RSM to develop multiple nonlinear regression equations through a three-factor three-level experimental design. The effects of different hardening accelerators and their interactions for FCM with respect to setting time ...
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Benefits and Detrimental Effects of Fly Ash in Concrete
Effects of fly ash based on mineralogical effects are as follows: Pozzolanic reaction. Fly ash reacts with Ca(OH) 2 of the cement hydration process to form additional Calcium Silicate Hydrates (CSH) and contributes to strength. This reaction is slower than the cement hydration but gives additional strength at 28 days and continues to gain ...
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Effect of class F fly ash on the durability properties of concrete
The effect of fly ash on shrinkage depends on its fineness and water requirements. Comparably less reduction of drying shrinkage was observed for samples with coarse fly ash. ... [22]; investigated the effects of different replacement level of fly ash on the chloride permeability of concrete by three different test setups. It was found that ...
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Journal of Physics: Conference Series
The mass percentage of fly ash particles in different bulk density ranges was shown in Figure1. The bulk density distributions of three types of fly ash were significantly different, and the distribution of F2 was wider than that of F1 and F3. ore than 98% of fly ash M particles were located in the bulk density ranges of 1-2.89 g/cm
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Study on whitening of fly ash coated by three precipitation coating
This study investigates the high-value comprehensive utilization of fly ash (FA) through a whitening process using three precipitation coating methods, namely BaSO 4, CaCO 3 and Mg(OH) 2.Various key parameters were investigated, including titration method, coating amount, solid-liquid ratio, reaction time and reaction temperature, and the relevant theories …
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Study on the Effect of Fly Ash on Mechanical …
When using seawater and sea sand as mixes, the mechanical properties and durability of concrete are adversely affected because the raw materials themselves contain harmful ions. Fly ash is the tailings formed in the …
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Fly ash effects : III. The microaggregate effect of fly ash
The good microaggregate properties of fly ash particles are reflected in three aspects [1]: (1) The self-strength of the glass microbeads in fly ash particles is very high, over 700 Mpa. (2) Fly ash particles have excellent interfacial property.
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A review of physical, chemical, and biological properties of fly ash
Most fly ash particles are in the silt-sized range of 2-50 microns. The three major mineralogical matrices identified in fly ash are glass, mullite-quartz, and magnetic spinel. The …
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(PDF) On Effects of Fly Ash as a Partial Replacement of Cement on
Fly ash improves the mechanical properties of concrete on the same principle as it improves durability because it chemically reacts after hydration, filling interstitial pores with extra high ...
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Wet storage effects on fly ash properties relevant to its use in air
Related studies indicate that dye removal from water by fly ash carbon (analogous to AEA uptake) is influenced, among other factors, by adsorbate pH and its effects on surface charge (Janoš et al., 2003; Wang et al., 2008).Research on wet-stored fly ash has shown that triboelectric carbon separation requires reversal of the electrode polarity (following drying) …
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Effect of Fly Ash on Engineering Properties of Expansive Soils
This note presents a study of the efficacy of fly ash as an additive in improving the engineering characteristics of expansive soils. An experimental program has evaluated the effect of the fly ash content on the free swell index, swell potential, swelling pressure, plasticity, compaction, strength, and hydraulic conductivity characteristics of expansive soil.
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Effects of fly ash fineness, nano silica, and curing types on
The effects of nano silica (NS), three different fly ash contents, two curing types and exposure to sulfate solution on mechanical and durability properties of two types of fly ash mortars are evaluated in this study.
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Performance and hydration mechanism of fly ash coal-based …
Research has found that incorporating fly ash and metakaolin into cement not only improves the mechanical properties of concrete, but also enhances the impermeability and durability [33], [34].Adjusting the ratios of fly ash, metakaolin, and cement can establish a stable ternary system for high-performance concrete production [35], [36].While research on cement …
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Effects of fly ash application on plant biomass and element
Coal fly ash is one of the by-products of combustion in thermal power plants (Ukwattage et al., 2013; Dzantor et al., 2015).The annual production of coal fly ash is more than 700 million tons and will continue to increase in the near future (Shaheen et al., 2014).Fly ash consists of fine and powdery particles that can be a source of water pollution but it also …
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Benefits and Detrimental Effects of Fly Ash in Concrete
The major beneficial effect of fly ash in concrete is based on its physical properties. Filler effect. Fly ash fills voids in the fresh concrete normally filled with water, reducing the water content of the mix. The reduction of water …
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Fly ash effects: I. The morphological effect of fly ash
Major Health and Environmental Hazards Caused by Fly Ash: Toxic compounds and heavy metals present in the fly ash can serious health issues like lung cancer, and …
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Use and effect of fly ash in concrete: A literature review
which is mainly attributed to the micro-filling effect of fly ash and the addition of plasticizer, ... t here are three types of fineness that pass through . sieves n ° 175, n ° 250 and n ° 32 ...
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Effect of High Temperature on CO2 Gasification Kinetics of Sub …
Gasification is an eco-friendly thermochemical conversion process that can use various raw materials to generate high value-added products. Coal fly ash residue from coal-based thermal power plants must be effectively managed and utilized. Therefore, this study investigates the effects of high temperatures (1100–1300 °C) on the gasification kinetics of two …
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Effects of fly ash properties on carbonation efficiency in CO2
In this study, five fly ashes from China and Australia were selected for carbonation. The experiments were first performed in a batch reactor at 40 and 140 °C, 20 bar initial CO 2 pressure, 200 g/L solid to liquid ratio, 450 rpm stirring rate to compare the carbonation characteristics of the five fly ashes and investigate the effects of fly ash properties on …
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