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Appropriately adding supplementary cementitious materials (SCMs) is an effective measure to reduce the negative influences of steam curing on concrete materials [9], [10].Hooton et al. found that adding an appropriate amount of silica fume or/and slag improved the long-term impermeability of steam-cured concrete [11].He et al. found that steam-cured concrete with …
The effect of replacing the cement with the granite powder or fly ash on the compressive strength (fcm) and bending tensile strength (fctm) of the air-cured hardened cementitious composites after ...
Beyond the fly ash, the effect of physicochemical characteristics of FAG on the mechanical properties was studied as well. Dehghani et al. [27] indicated that an increasing …
Fly ash is categorised into Class F and Class C as accordance to ASTM C618-19 based on the calcium oxide (CaO) content. Class F fly ash has CaO content lower than 18% while the Class C fly ash has CaO content greater than 18.0%. Most studies focused on using the blend of Class F fly ash and blast furnace slag [[6], [7], [8], [9]].
Shon, C.-S., Abdigaliyev, A., Bagitova, S., Chung, C.-W., and Kim, D. (2018). Determination of air-void system and modified frost resistance number for freeze-thaw resistance evaluation of ternary blended concrete made of ordinary Portland cement/silica fume/class F fly ash. Cold Regions Science and Technology, 155, 127–136.
1. Introduction. The development of new technology and progression of industrialization has been found to be consistence with the production of larger amount of industrial wastes in several formerly agricultural countries [1].The output of fly ash produced from electricity consumption and industrial development was approximate 2000 × 10 6 t in 2021, …
Study on Mechanical Property of Air-entrained Fly Ash Concrete in Freezing-thawing Circumstance. Author: Qianhui Xiao Authors Info & Claims. ICETCE '12: Proceedings of the 2012 Second International Conference on Electric Technology and Civil Engineering. Pages 2755 - 2758. Published: 18 May 2012 Publication History.
When the attack age is 30 days, the air content of fly ash content of 0%, 10%, and 20% are all reduced to the minimum. Without sulfate attack, the air content of concrete without fly ash is more than 40% at 0.50 ∼ 1.0 mm chord length compared to the air content of concrete with fly ash.
The proper alkali activator and appropriate curing temperature are important factors to increase the compressive strength of geopolymer. Fly ash-based geopolymer needs to be cured at a relatively high temperature, above 60 °C [31], [3], [27] to obtain good mechanical properties as fly ash has low reactivity at room temperature. Accordingly ...
1.2. Research objectives. The ASTM C1827-20 index is related to a combination of ing efficiency and ing stability of the AEA in the fly ash–cement …
Physical Properties of Fly Ash. The physical properties of fly ash are, 1. Fineness of Fly Ash. As per ASTM, the fineness of the fly ash is to be checked in both dry n wet sieving. The fly ash …
Table 2 shows the chemical composition, specific gravity, specification conformance, and source/beneficiation information for all tested fly ashes. Class F and C fly …
Aerated concrete is a lightweight concrete consisting of sand, cement, water, and air-entraining agent such as aluminum powder. This research uses fly ash as a substitute for cement with a ...
Mechanical treatment of fly ashes Part IV: Strength development of ground fly ash-cement mortars cured at different temperatures. Cement and Concrete Research, 30 ... R. Hela, Possibility of mechanical activation of the coarse fly ash from the Ljungström air preheater, I. International conference POPÍLKY ve stavebnictví 2013, Brno, Czech ...
The slump value of the fly ash-based geopolymer concrete was 80 mm to 110 mm, as reported by Chithambaram et al., with 74–76% aggregate content [33]. However, Meesala et al. [51] explored the workability of freshly prepared geopolymer concrete based on fly ash at a 4% mass ratio, achieving a maximum flow within the range of 95 mm to 145 mm ...
The potential of applying geopolymerization to a wide range of solid industrial waste and by-products is of great interest. In this research, the physical and mechanical properties of fly ash (FA ...
The milling is conducted in solution of deionized water and in atmosphere of air. The mill needs a 30-min cooling interval after every 30-min of operation ... To study the effect of different fly ash treatments on the mechanical properties of mortar, three kinds of fly ash – raw FA, DFA, and MFA with one more stage of washing (WMFA) – are ...
When the fly ash content was 10% and the alkali equivalent was 4%, the dynamic modulus loss was the lowest. As Fig. 19 (a) illustrates, fly ash cannot be properly activated when the fly ash content is too large because of the presence of modified municipal sludge. Concrete became less dense overall while absorbing more water.
The mechanical and microstructural properties of lightweight CaO–Mg(NO 3) 2-activated FA composites were investigated.. The added Mg(NO 3) 2 up to 6 wt% significantly improved strength.. The added Mg(NO 3) 2 stimulated dissolution of CaO and FA inducing rapid C-(A)-S-H and NO 3-AFm phase formation.. The expanded perlite and vermiculite only served …
Fly ash and a mixture of alkaline activators namely sodium silicate (Waterglass) and sodium hydroxide (NaOH) solution at different Alkaline activator/Fly ash ratio (0.3, 0.35 and 0.4) were used to ...
A key property of fly ash concrete that has received coverage in the literature is air entrainment (Folliard et al., 2009; Hill et al., 1997; Külaots et al., 2004; Pedersen et al., 2008).Air-entraining admixtures (AEAs, surfactants) used to achieve this contribute freeze–thaw resistance to concrete (Dyer, 2014) as well as other effects (e.g. increased cohesiveness, reduced …
1. Introduction. The FA is manufactured as residue from the coal-fired thermal electric stations (Golewski and Szostak, 2021a; Gu et al., 2022).Normally, coal is crushed and wafted with fresh air into the kiln's burning space where it directly burns, producing temperature and fabricating a liquefied crystal deposit (Lamine Zeggar et al., 2019).Large ash particles are …
Fly ash bricks are used for load-bearing masonry. The bond development between the masonry unit and the mortar is mainly due to the mechanical interlock of cement hydration products in the brick ...
As the reduction of CO 2 emissions is set as an international goal, the use of biomass is increasing. However, the large amount of ash generated after using biomass is an important issue to deal with. The chemical composition of some biomass fly ash is similar to that of C-class fly ash, so it is suitable for use as supplementary cementitious materials, and many …
Fly ash cenospheres (FAC) are hollow spheres and are filled with air or gases. FAC have been found tremendous applications in various industries due to their low densities (0.2–0.8 g cm −3), low thermal conductivities (about 0.065 W m −1 K −1), and excellent stability in alkali solution and at high temperatures [25], [26], [27].Meanwhile, preliminary study proved that …
The increasing use of biomasses in the production of electricity and heat delivers an increased amount burning residue, fly ash that disposal is becoming more and more …
The on-line produced mercury removal technique for coal-fired power plants, based on modified fly ash sorbent injection was developed by North China Electric Power University [17].The schematic configuration and setup are shown in Fig. 1, in this concept, the raw material used in this technique is obtained from the ash hopper of the ESP, and then modified by an on …
Injecting CO 2 in the fresh cement-based mixture during mixing could considerably lower the workability. In this study, fly ash (FA) was used as a cement replacement at 10, 15, and 20 wt.% to overcome the CO 2-injecting caused negative impact.The effects of CO 2-mixing dose (injected during fresh stage) on the fresh, mechanical and microstructural performances of …
Fly ash of coal-fired boiler (<200 mesh, Taiyuan Iron and Steel Group Solid Waste Treatment Center) and magnesium slag (Shanxi Xiaoyi Coal Power Aluminium Group) were directly mixed (weight ratio, 108:100) and obtain blend1; blend2 was obtained through mix fly ash, magnesium slag, potassium feldspar, and soda feldspar at a mass ratio of 4:2:1:1.
Fig. 4 also shows microstructural observations of the alkali activated fly ash binder after 24 h of curing, and particularly illustrates the microstructural difference between a calcium-rich particle and a particle from the vitreous phase both originally present in the fly ash. They can both be distinguished by SEM by their chemical composition ...