— 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 …

 — 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) …

Furthermore, research works conducted on the development of LWACs using LECA, fly ash and micro-fine slurry powder (MSP) are discussed. Research findings show that LWAC prepared with LECA as coarse and fine aggregate along with 25% fly ash + 10% MSP as cement replacement exhibits good mechanical and thermal properties.

 — 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%, 30%, 35%, …

 — Effect of Micro Polypropylene Fibre on the Performance of Fly Ash-Based Geopolymer Concrete ... 0.300, 0.325, and 0.350 and an aggregate to binder ratio of 1.75 were adopted. ... The combined ...

 — 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) The self-strength of the glass microbeads in fly ash particles is very high, over 700 Mpa. …

 — Effect of Fly Ash, GGBS, and Metakaolin on Mechanical and Durability Properties of Self-Compacting Concrete Made with Coarse Recycled Aggregate Authors : Krishna Nandanam [email protected], Uma Shankar Biswal [email protected], and Pasla Dinakar [email protected] Author Affiliations

 — 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 ...

 — The chemical effect of FA in MAPC is lower than GP and GGBS. • FA mainly plays a physical ball-bearing effect for workability improvement. • FA enhances the later-stage strength and water resistance by the micro-aggregate effect. • FA promotes the generation and crystallization of hydrates and modifies the microstructure.

 — 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 …

 — 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 …

 — 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 ...

 — Physical filling effect of aggregate micro fines in cement concrete. Constr. Build. Mater. (2013) R.A. Buswell et al. 3D using concrete extrusion: A roadmap for research. Cem. ... Leveraging internal curing effect of fly ash cenosphere for alleviating autogenous shrinkage in 3D . Construction and Building Materials, Volume 346 ...

 — 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 …

 — The concrete mix with 30% of fly ash aggregate replacement showed high increment strength in strength of 61.37% and complete healing of maximum cracks …

 — However, the flocculent and layer gels wrapped the spherical particles of fly ash in pastes (Figure 12b), suggesting that fly ash can also act as RCP and have the "micro aggregate" effect, which ...

 — 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 …

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 …

DOI: 10.1080/14488353.2022.2145030 Corpus ID: 253827245; Micro aggregate and pozzolanic reactivity of fly ash: effect on fracture properties …

 — 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 …

 — 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.

 — 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. …

 — The results show that during the hydration period of 28 days, the low-calcium fly ash has a micro-aggregate filling physical effect. However, after 56 days, the hydration degree of fly ash begins to exceed 1%. This illustrates that the low-calcium fly ash has both the pozzolanic activity effect and micro-aggregate filling effect.

 — 2.1 Materials. The raw materials used in this study included Portland cement, fly ash, coarse aggregate, fine aggregate, water reducing agent and water. The P·I 42.5 cement in accordance with GB 175–2007 [], which it is equivalent to type I cement in accordance to ASTM C150-2020 [], was used in this study.The specific surface area of …

 — 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 ( …

 — 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 ...

 — 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 …

Unreacted fly ash particle can still contribute to the properties of cement stone; this is known as the microaggregate effect of fly ash. In this article, the authors report on a systematic …

 — In view of this, in the present study, 0%, 20%, 30%, 35%, 40%, 50%, 60% and 70% of fly ash is replaced for cement to investigate the dominance of pozzolanic or …

 — "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 …