Fly Ash Micro-Aggregate Effect
Combined effects of recycled aggregate and fly ash …
With regard to the effect of fly ash, the cases using fly ash as a 30% substitution of cement showed 45– higher slump values than the cases with no fly ash. Therefore, it was concluded that both recycled coarse aggregates and fly ash are helpful in improving the flowability of fresh concrete, as found from the flow curve tests ( …
Impact of Sintered Fly Ash Aggregate on Mechanical, …
AbstractThis research paper presents a detailed investigation into the use of waste fly ash–based lightweight aggregate developed by a sintering process in concrete. ... K., R. Siddique, and S. Goyal. 2019. "Strength, permeation and micro-structural characteristics of concrete incorporating waste marble." ... Zhu, C., J. Niu, J. Li, C ...
Carbonation performance of concrete with fly ash as fine aggregate …
However, fly ash also has micro-aggregate influence as well as morphological effect [10]. First, fly ash glass microbeads has a similar shape as microaggregates. Fly ash particles are glass-bead like and the fly ash's strength is extremely high, which can increase the strength of cement mortar. ... under the …
Fly ash effects: III. The microaggregate effect of fly ash
Further, micro aggregate effect decreases with age due to the pozzolanic reaction of fly ash (Wang, Zhang, and Sun 2004). Furthermore, it is reported that some …
Fly ash effects : III. The microaggregate effect of fly ash
It is pointed out that the microaggregate effect is an important effect of fly ash. It is strengthened with the increase of content of fly ash, but weakened with age. At …
Feasibility of low-carbon electrolytic manganese residue …
The fly ash-doped mortar strength increases and then decreases with the addition of EMR from 0 to 5 % to 5–20 %. It was found that blast furnace slag contributes less to strength than fly ash. Moreover, the sulfate activation and the micro-aggregate effect compensate for the EMR-induced dilution effect.
Leaching kinetics and reactivity evaluation of fly ash based …
The recent development of sustainable green cement technology has brought hope on fly ash for production alkali-activated cementitious materials (AACs), due to the high content of SiO 2 and Al 2 O 3 (the sum of SiO 2, Al 2 O 3, and Fe 2 O 3 is approximately 70 %). The practicability of using fly ash to produce AACs has been …
Effect of Fly Ash, GGBS, and Metakaolin on Mechanical and …
Incorporation of supplementary cementitious materials such as fly ash (CFA) [14,15], ground granulated blast furnace slag (GGBS) [8], metakaolin (MK) [16], rice husk ash [17], and silica fume [18 ...
Hydration and physical characteristics of ultrahigh-volume fly ash …
As for the filling role, the packing extent of the system depends on both the fly ash and the cement used: better packing is achieved with coarse cement and with finer fly ash [9]. In addition, the micro-aggregate effect of the coarse fly ash particles is reflected in three aspects: (1) the high strength of the glass micro-beads in the fly ash ...
Microstructure and performance of fly ash micro-beads in …
Many researchers devoted themselves to the application and the action mechanism of fly ash in cementing material system in the past 70 years, and the hypothesis of "fly ash effects" was put forward, including three effects of fly ash in concrete, i.e., morphological, active and micro-aggregate effects [8], [9], [10], [11].It is …
Micro aggregate and pozzolanic reactivity of fly ash: effect …
The performance of fly ash blended concrete is influenced by the pozzolanic and/or micro-aggregate effect of fly ash particles based on the replacement levels. …
Effect of fly ash and limestone powder on inhibiting alkali aggregate …
After adding the fly ash, the alkalinity of the hydration products in the cement slurry is decreased, and the relative power of alkaline oxides and the reactive aggregate combination will be small. This will reduce the possibility of alkali aggregate reaction. 3.5.3. AAR inhibiting of W1# aggregates by using of fly ash and limestone powder
Effect of Fly Ash on Properties of Mixed Aggregate Plastering Mortar
The results show that with the increase of the fly ash content, the flow degree of the mortar is gradually increased and then decreased; the apparent density, water retention, and compressive strength of the mortar are gradually reduced; the bonding strength of the iron-tail mineral sand and the artificial sand mixed aggregate mortar is ...
Micro-structural behavior of interfacial transition zone of the …
Thus, fly ash can also be considered a composite material, with the ash particles serving as reactive micro-aggregate [14]. Fly ash has been shown to improve the workability of concrete, increase compressive strength (initial stages and long-term), reduce drying shrinkage and creep, and enhance durability [10,15–17].
Enhancement of mechanical properties of fly ash …
In this study, the micro carbon fiber (CF) was used to enhance the mechanical properties of fly ash geopolymer containing fine recycled concrete aggregate (RCA). Natural river sand was replaced with RCA at 0, 50, and by volume.
Nano- and micro-scale characterisation of interfacial …
Furthermore, the ITZ of concrete mixes 70BFS-FA (Fig. 17 d) and BFS80 (Fig. 17 f) exhibited a huge gap between aggregate and paste with higher amount of unhydrated slag and fly ash particles, larger pores and micro cracks created a weaker ITZ which is also reflected in the results of nano indentation tests as well as compressive …
Investigation into low density fly ash aggregate in micro …
This paper presents the effect of low density aggregate (LDA) made from fly ash on compressive strength, flexure strength, flexure bond strength, drying shrinkage and shrinkage due to raised ...
Effect of Fly Ash on Leaching Characteristics of Cement …
The micro-aggregate effect occurs when the fly ash is added to the cement-stabilized macadam material. The aggregate without the fly ash is not compact. The spherical particles of the fly ash can fill the micropores formed by the sand, and the aggregate compactness is significantly improved [31,32,33]. The cement hydration …
Use and effect of fly ash in concrete: A literature …
Fiallo, "Effect of the fusion and aging process in the synthesis of zeotypes from fly ash," Revista Facultad de Ingeniería, Universidad de Antioquia, no. 74, pp. 213-225, 2015. [5]
Characterization of interfacial transition zone of fly ash …
This phenomenon is due to the pozzolanic reaction and micro-aggregate effect of fly ash changing the microstructure of the ITZ of the sample [17]. The pozzolanic reaction refers to the reaction of calcium hydroxide (CH) that occurred from cement …
Enhancing Concrete with Ultrafine Fly Ash: Mechanical …
Fly ash, a byproduct collected from the flue gas of coal combustion, serves as an effective additive in concrete. It offers environmental benefits by converting waste into a valuable resource, thus promoting energy conservation, emission reduction, and waste utilization. ... thereby boosting its reactivity and micro-aggregate effects. This ...
Effect of Fly Ash on Leaching Characteristics of …
The fly ash, containing active silica, can react with calcium hydroxide to produce hydrated calcium silicate with smaller pores, which reduces the overall porosity of the sample [29,31,32,33]. The micro …
Study on the Effect of Recycled Fine Aggregate …
The rapid expansion of construction, fueled by industry and economic and population growth, has exacerbated the challenge of managing construction waste, especially concrete waste. One promising …
Micro aggregate and pozzolanic reactivity of fly ash: effect …
DOI: 10.1080/14488353.2022.2145030 Corpus ID: 253827245; Micro aggregate and pozzolanic reactivity of fly ash: effect on fracture properties @article{Thiyagarajan2022MicroAA, title={Micro aggregate and pozzolanic reactivity of fly ash: effect on fracture properties}, author={Hemalatha Thiyagarajan and Mahesh …
Micro-structural behavior of interfacial transition zone of …
Zwick Roell 'ZHVµ' Micro Vickers hardness tester was used to determine the microhardness of the samples. ... Effects of lightweight fly ash aggregate properties on the behavior of lightweight concretes. J. Hazard. Mater., 179 (2010), pp. 954-965, 10.1016/j.jhazmat.2010.03.098.
Recycling of aggregate micro fines as a partial replacement for fly ash
In China, about 10–20% of aggregate micro fines (AMF) is inevitably produced in the process of manufactured sand[22], [23], [24]. Currently, most AMF is usually disputed as waste, which causes a heavy burden on the environment.Utilizing AMF as supplementary cementitious materials for 3DPC would be beneficial because it can …
Evaluation on the performance of magnesium phosphate …
The micro-aggregate effect indicates that the particles of fly ash and silica fume are small, which can fill the cracks and pores of the cement matrix and improve the density of the material [32], [33], thereby increasing the frictional resistance between the matrix and the fiber. Because the particle sizes of fly ash and silica fume are ...
Understanding the effect of high-volume fly ash on micro …
Using coal gangue and fly ash as cemented paste backfill materials is a viable solution to address the aforementioned environmental problems [11], [12].Backfill mining can offer support to the overlying strata, limit surface subsidence, and promote solid waste utilization, thereby enhancing the recovery rate [13].Cemented paste backfill with …
New insights into the effects of silicate modulus, alkali …
The resourceful disposal and recycling of concrete waste have already established a mature technological system. Among them, crushing concrete waste into recycled concrete aggregates to replace natural sand and stone aggregate, or crushing it into recycled concrete powder to serve as supplementary cementitious material, …
Fly ash effects : III. The microaggregate effect of fly ash
This is the microaggregate effect—a very important effect—of fly ash. The good microaggregate properties of fly ash particles are reflected in three aspects [1]: (1) …
Effects of fly ash/diatomite admixture with variable particle …
At the d 50 value of 15.2 μm, the mechanical properties of concrete were greatly improved. In addition, finer particle of the fly ash/diatomite admixture leads to …
The effect of fly ash and silica fume on mechanical …
The concrete aggregate is fully replaced by coral sand and coral reef rubble. • Porous coral aggregate causes low strength and poor durability properties of concrete.. The mechanical properties and durability of CAC incorporation of FA and SF are studied.. The Vickers' micro-hardness test of ITZ in CAC is conducted.. The possibility of …
The effect of fly ash and silica fume on mechanical …
The effect of fly ash and silica fume on mechanical properties and durability of coral aggregate concrete. ... The Vickers' micro-hardness test of ITZ in CAC is conducted. ... This report presents the results of experimental work on the mechanical properties of coral aggregate concrete (CAC) containing fly ash (FA) and silica fume …
Compressive strength and microstructure of fly ash based …
Fly ash was employed as source material of alkali activation. The original Blaine surface area is about 230 m 2 /kg. Fly ash particles were ground into smaller particles to reach a Blaine surface area of 400 m 2 /kg with higher chemical activation, which is helpful for the preparation of geopolymer with high strength and high thermal …
Effect of high volume fly ash and micro-steel fiber on …
Section snippets Materials. Cement - The study used Type II cement that adhered to the ASTM C150 [47] standard. The chemical properties of cement are given in Table 1. Fly ash - Class F fly ash conforming to ASTM C618 [48] was used as cement replacement material. Fly ash was obtained from the thermal power plant located in the …
Investigation on Preparation and Application in Concrete of …
Super-fine grinding can break the out-shell of fly ash beads, releasing the nano-spheres and really improving the active and micro-aggregate effects of fly ash micro-beads.
Micro aggregate and pozzolanic reactivity of fly ash: effect …
The performance of fly ash blended concrete is influenced by the pozzolanic and/or micro-aggregate effect of fly ash particles based on the replacement levels. Dominance of either of this effect greatly influences the mechanical and fracture properties of fly ash blended concrete. In view of this, in the present study, 0%, 20%, …
Magnesia modification of alkali-activated slag fly ash …
The results indicate that the setting time of this cement is similar to that of the ordinary commercial cements; its strength reaches the standard of 42.5 degree cement, its cracking resistance has been remarkably improved because of the micro-aggregate effect of fly ash and shrinkage compensating of magnesia.