carbonation of fly ash concrete investigated with - search results
Carbonation and its effects in reinforced concrete ...
@article{osti_20014072, title = {Carbonation and its effects in reinforced concrete}, author = {Broomfield, J P}, abstractNote = {Carbonation is the result of interaction of carbon dioxide (CO{sub 2}) gas in the atmosphere with the alkaline hydroxides in the concrete. CO{sub 2} diffuses through the concrete and rate of movement of the carbonation front roughly follows Fick's law of …
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Carbonation resistance of GGBS concrete | Magazine of ...
This study presents an analysis of a 30 000 strong data matrix derived from 227 studies originating from 35 countries since 1968. Similar to the fly ash effect, the carbonation of concrete increases with the incorporation of ground granulated blast-furnace slag (GGBS), but the rate increases as GGBS content is increased.
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Model for Simulating Carbonation of Fly Ash Concrete
Model for Simulating Carbonation of Fly Ash Concrete. The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases and water in concrete by the mass balance equations and the Fick's law of diffusion.
ادامه مطلبPerformance-based design and carbonation of concrete with ...
Abstract. This paper reports on an investigation of the durability of high-volume fly ash concrete exposed to carbonation (XC class in EN 206-1 Standard). The reduction of cement content is assumed to mitigate CO 2 emissions due to the production of Portland cement clinker. The durability of concrete is assessed through a performance-based ...
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Carbonation resistance of fly ash and blast furnace slag ...
The carbonation resistance of fly ash (FA) & blast furnace slag (BFS)-based geopolymer (GP) concrete were investigated in detail by theoretical analysis and the accelerated carbonation test. Carbonation rates of the ambient cured GP concrete and GP mortar were modeled by power functions.
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(PDF) PERFORMANCE OF FLY ASH CONCRETE AGAINST SULFATE …
181. Anwar an d Makhlouf, Performance of Fly Ash Concrete Against Sulfate Attack …. material content (BMC) is 410, 330, and 280 kg/m 3 and values of. water/binder material ratios ( W/B) are 0.4 ...
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Carbonation of fly ash concrete | Magazine of Concrete ...
The carbonation of fly ash concrete is reported, with particular emphasis on the role of curing. Concretes with nominal strength grades C25, C35 and C45 and a range of fly ash levels (0–50%) were exposed to various treatments during the first 28 days; i.e. different moist curing periods anda range of ambient temperatures and relative humidities after curing.
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Experimental Investigation of Neutralisation of Concrete ...
To study the durability of concrete with fly ash as fine aggregate under alternate freeze-thaw and carbonation, freeze-thaw and carbonation cyclic tests are conducted to explore variation characteristics such as relative dynamic modulus of elasticity and neutralisation depth. The influence coefficient ( λ C ) of carbonation on concrete freeze-thaw damage and the influence coefficient …
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Carbonation performance of concrete with fly ash as fine ...
To solve this problem, some researchers have investigated the use of fly ash as part substitution for fine aggregate in concrete. Concrete with fly ash as fine aggregate (CFA) indicates that in the process of concrete production, a certain amount of sand is substituted with fly ash, whereas the content of cement remains unchanged.
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Preparation, microstructure and property of carbonated ...
After CO 2 curing for 8 h, up to 10.53 wt% CO 2 was sequestered by the aggregates (S60F30) owing to the carbonation of the mixes of steel slag, Portland cement and fly ash, and in turn produced up to 20.10 wt% calcium carbonate in total (including natural carbonation prior to the accelerated carbonation), yielding dense microstructures, high ...
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Carbonation of Concrete Incorporating High Volumes of Fly Ash
Date: 3/22/2006. Abstract: This investigation deals with determining the carbonation resistance of high-volume fly ash concrete. Five air-entrained concrete mixtures were studied consisting of three high-volume fly ash concrete mixtures (HVFA) incorporating 58% of fly ash by mass of the total cementitious materials made with a water ...
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Fly-Ash Concrete | Scientific.Net
Abstract: The effects of carbonation age, fly ash content in the binder and the water to binder ratios on the carbonation depth of fly ash concrete is investigated and the micromechanical properties of the hardened paste and the inter facial transition zone is analyzed with the micro-hardness method.
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Carbonation resistance of fly ash concrete | Request PDF
The carbonation resistance of concrete coated with crystalline coating material (CCM) was experimentally investigated. Specimens with different water to binder ratios (0.4, 0.5, 0.6) and fly ash ...
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Evaluation of alkalinity changes and carbonation of ...
According to their study, fly ash with high Ca content is more susceptible to carbonation and superior pH reduction compared to low Ca-based fly ash-based geopolymer concrete. All the studies summarised above were conducted in an accelerated carbonation environment with the CO 2 concentration higher than 5%.
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Accelerated Carbonation Assessment of High-Volume Fly Ash ...
In this study, the effect of high-volume fly ash concrete exposed to low ambient relative humidity (RH) conditions (57%) and accelerated carbonation (4% CO2) is investigated. Twenty-three concrete mixtures were produced varying in cementitious contents (310, 340, 370, and 400 kg/m3), water-to-cementitious materials ratio (0.45 and 0.50), and ...
ادامه مطلبCarbonation of Fly Ash Concrete and Micro-Hardness ...
The effects of carbonation age, fly ash content in the binder and the water to binder ratios on the carbonation depth of fly ash concrete is investigated and the micromechanical properties of the hardened paste and the inter facial transition zone is analyzed with the micro-hardness method. The experimental results show that replacing Portland cement in concrete with fly ash increases the ...
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Effects of stress and high temperature on the carbonation ...
Although the pore structure of concrete can be improved by the secondary hydration reaction between calcium hydroxide and fly ash, fly ash concrete also shows a limited carbonation resistance at ...
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INVESTIGATION ON FLY ASH AS A PARTIAL CEMENT …
investigation on fly ash as a partial cement replacement in concrete ... effect of fly ash on carbonation of concrete 11 4.2. sulphate attack 11 4.3. corrosion of steel 11 4.4. reduced alkali- aggregate reaction 11 4.5. environmental benefits of fly ash use in concrete 12 4.6. physical properties 12 4.7. pozzolanic properties of fly ash 12 4.8.
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Model for Simulating Carbonation of Fly Ash Concrete ...
The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases (C O 2 and water vapor) in concrete by the mass balance equations and the Fick's law of diffusion.The time dependent hydration, and pozzolanic and carbonation reactions were considered for evaluating the amount of calcium hydroxide in concrete.
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Prediction of Carbonation Progress in Concrete Containing ...
After carbonation in concrete with a low w/c ratio, there are still many fly ash grains, which are not involved in the carbonation process. In the case of w/c = 0.52 after carbonation, fewer fly ash particles and portlandite crystals were visible due to the generally higher homogeneity of the microstructure.
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Effects of Fly Ash on Carbonation of Concrete With ...
Date: 8/1/1991. Abstract: An investigation has been carried out on the effects of cement replacement by fly ash on the carbonation rate of concrete. The research was mainly devoted to portland blast furnace slag cement because this cement has a major market share in the Netherlands. It has been concluded that in the case of portland blast ...
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Effects of stress and high temperature on the carbonation ...
In order to study the carbonation resistance of fly ash concrete under multi-factor coupling conditions and provide a suggestion for the design and analysis of actual projects, an experimental investigation was conducted on the effects of the compressive and tensile stress, the high exposure temperature, and the fly ash content, on the carbonation resistance of fly ash concrete.
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Influence of Fineness of Fly Ash on the Carbonation and ...
The paper presents an investigation on the influence of the fineness of fly ash on the carbonation and electrical conductivity of concrete. Fly ash collected from three thermal power stations in India (with a Blaine's fineness of 200, 255, and 305 m 2 / kg, respectively) were used for this study.The study also involved three replacement levels (15, 25, and 35% of cementitious materials) for ...
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Carbonation Depth Model and Prediction of Hybrid Fiber Fly ...
4.1. Effect of Fly Ash Content on Carbonation Depth of Concrete. In order to analyze the influence of fly ash content on the carbonation depth of concrete, the carbonation depth of hybrid fiber reinforced concrete (HFRC) with fly ash content of 0%, 5%, 10%, 20%, and 30% varies with time, as shown in Figure 6. <- Prev.
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Effects of Compressive Strength and Carbonation of HCSA ...
In this article, the effects of compressive strength and carbonation depth of HCSA mixing amount on high volume fly ash concrete have been investigated.
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Carbonation Resistance of High Volume Fly Ash Concrete ...
[24] A. Younsi, et al., Performance-based design and carbonation of concrete with high fly ash content, Cement and Concrete Composites. 33 (2011) 993-1000. DOI: 10.1016/j.cemconcomp.2011.07.005 [25] P.K. Mehta, Role of pozzolanic and cementitious material in sustainable development of the concrete industry, 6th International conference on the ...
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Accelerated Carbonation Assessment of High-Volume Fly Ash ...
Carbonation of Fly Ash Concrete While the mechanisms of degradation are well-known in plain cement systems, recent studies have focused on the effects of fly ash replacement on carbonation depth. In a research conducted by Khunthongkeaw et al. [11], they concluded that fly ash containing higher calcium oxide (CaO) content tends to have lower
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ACCELERATED CARBONATION ASSESSMENT OF HIGH …
This investigation deals with determining the effect of 57% relative humidity and 4% CO 2 concentration on class C and class F fly ash concrete specimens under accelerated carbonation. Fly ash concrete specimens were differentiated based on the cementitious content (310, 340, 370, ...
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Influence of Crack Geometry and Crack Width on Carbonation ...
Two types of cracks in cylindrical High-Volume Fly Ash mortar specimens were investigated: (1) an artificial crack created by pulling out a cast-in metal plate with a thickness of 100, 200 or 300 µm, and (2) a realistic crack created by splitting cylinders and reattaching them with silicon spacers (with a thickness of 100, 200 or 300 µm).
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Degradation of fly ash concrete under the coupled effect ...
Moreover, the cement hydration development may be postponed by the fly ash replacement. Therefore, the fly ash concrete has low density at the early ages. In contrast, the fly ash concrete subjected to 28 days chloride aerosol ingress followed by 28 days carbonation reveals higher density, as indicated in Fig. 8(b).
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