— 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 …
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— The unreacted fly ash particles play a significant role in the arrest of crack propagation in the geopolymer matrix. As shown in Fig. 4 (a–c), the fly ash particles limit the growth of the micro-crack; however, the crack path appears to propagate around the spheres because of the additional stress required to fail the geopolymer composite [59 ...
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— Rheological behavior of high volume fly ash mixtures containing micro silica for digital construction application. Mater. Lett., 237 ... Physical filling effect of aggregate micro fines in cement concrete. Constr. Build. Mater., 41 (2013), pp. 812-814, 10.1016/j.conbuildmat.2012.12.037.
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— "Fly ash effect" refers to a series of effects including morphological effect, micro-aggregate effect and active effect. With the enlargement of FLA particle size, the morphological effect and micro-aggregate effect weaken obviously, which might result in some bad impact on FAFG such as more heterogeneous pore distribution, larger …
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— The lowest EIF90 value of 5.4 kg∙MPa-1∙m3 was achieved for the fly ash-doped mortar with 5 % EMR, suggesting the synergistic effect between fly ash and EMR optimised the mechanical properties ...
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— Autogenous and autonomous processes are being for the production of self-healing concrete. In the autogenous process, Mineral admixtures, Nano-fillers, and …
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— 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.
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— The carbon content of fly ash (FA) influences the performance of concrete. In this paper, the flotation decarburization treatment was carried out on high carbon fly ash (HCFA) to obtain flotation decarburized fly ash (FDFA). The effects of flotation decarbonization treatment of fly ash on workability, mechanical properties, chloride …
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— 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.
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— 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 temperature for accelerated drying of the micro concrete for concrete repair. Sintered fly ash lightweight aggregate were crushed to required sizes …
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— As the largest amount of solid waste produced by rapid oxidation of coal powder during thermal power generation [3], Fly ash (FLA) pollutes the local …
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— DOI: 10.1016/J.JCLEPRO.2018.01.155 Corpus ID: 139156527; Effects of micro-environmental climate on the carbonation depth and the pH value in fly ash concrete @article{Lu2018EffectsOM, title={Effects of micro-environmental climate on the carbonation depth and the pH value in fly ash concrete}, author={Caifeng Lu and Wei Wang and …
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— Semantic Scholar extracted view of "Understanding the effect of high-volume fly ash on micro-structure and mechanical properties of cemented coal gangue paste backfill" by Y. Cheng et al. ... Effect of aggregate size distribution and confining pressure on mechanical property and microstructure of cemented gangue backfill materials.
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— 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.
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— This illustrates that the low-calcium fly ash has both the pozzolanic activity effect and micro-aggregate filling effect. In contrast, the low-calcium fly ash hydrated for 90 days is still dominated by the …
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— Using fly ash-cement slurry encapsulation and CO 2 mineralization resulted in an increased apparent density for the treated CGA. This increase is due to the 'micro-aggregate effect' of fly ash filling CGA pores and the 'pozzolanic effect' leading to some fly ash hydration, generating products that fill voids for a denser structure [37].
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— From the above data, it is clear that Self-healing concrete also showed maximum strength with natural aggregate only, when compared with other mixes but the increment in strength was more in Fly ash aggregates mixed concrete from 28 to 56 days. 30% Fly ash aggregate mixed concrete (B2 mix) showed a maximum increment of …
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— 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 …
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— Micro aggregate and pozzolanic reactivity of fly ash: effect on fracture properties. Hemalatha Thiyagarajan, Mahesh Mungule, S. Sasmal. Published in …
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— The shortage of natural aggregates caused by massive infrastructure construction has promoted the development of alternative aggregates. In this study, artificial aggregates based on alkali-activated technology were designed and manufactured, where fly ash (FA) and a blended sodium silicate/hydroxide solution were used as the …
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— The binder materials used in this study include ordinary Portland cement (OPC, grade 42.5) and Class C fly ash (FA). The specific surface areas of OPC and FA calculated with the Blaine permeability apparatus proved to be 342 m 2 /kg and 637 m 2 /kg, respectively. The coarse aggregate for the cemented paste backfill (CPB) was coal …
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— Methods of sampling fly ash: 2021: Japan: JIS A 6201: Fly ash for use in concrete: 2015: United Kingdom: BS EN 450-1: Fly ash for concrete. Definition, specifications and conformity criteria: 2012: BS EN 450-2: Fly ash for concrete. Conformity evaluation: 2005: PD CEN/TR 15840: Evaluation of conformity of fly ash for concrete. …
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— At this stage, it is appropriate to show a comparison between this aggregate and three other types. These are the Granite natural aggregate, the Dacite natural aggregate (an igneous volcanic rock with a high iron content and commonly used in Australia in concrete works), and another commercially available pelletized fly ash …
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— The particle rolling effect of fly ash improved the fluidity of mortar and reduces the amount of water, thus improving the mechanical properties of MPC. Notably, in the case of 30 wt% FA-modified MPC, the compressive strength could be elevated to 83 MPa at 28 days. ... The micro-aggregate effect, pozzolanic effect, and adsorption effect of ...
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— 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 …
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— 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. …
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— This paper explores the physical, mechanical and durability characteristics of Fly ash—ground granulated blast furnace slag (GGBS) based Geopolymer aggregates include Specific gravity, impact value, crushing value, loss angles abrasion value, attrition value and water absorption respectively. Besides, scanning electron microscopy (SEM) …
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— The influence of geopolymer binder characteristics on the performance of geopolymer concrete has been extensively investigated. Yet, the influence of aggregate properties has not been thoroughly studied, and it is usually assumed that their effect is the same as in cement concrete. This study investigates the effect of aggregate on the …
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— The construction industry can be more sustainable by utilizing solid waste as building materials. In this work, the combined effect of ceramic tile waste (CTW) and fly ash (FA) on the compressive strength and permeability of concrete was studied. CTW was used as a partial to complete substitute for crushed sand (10% to ), and FA was used as …
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— Concrete is prepared by substituting an equal volume of fly ash for fine aggregate, and the effect of substitution rate on its carbonation resistance is studied. Using a rapid carbonation test, the distribution law of the internal pH value of concrete with fly ash as fine aggregate (CFA) along the carbonation depth under different substitution rates …
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