Study on flexural properties of active magnesia carbonation concrete with fly ash content

Zhang, Henian; Shen, Chen; Xi, Peisheng; Chen, Kaixiang; Zhang, Fang; Wang, Shaohan

doi:10.1016/j.conbuildmat.2018.08.017

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…These results suggested that the addition of FA significantly reduced the UCS strain of loess; therefore, FA-treated soils exhibited a more brittle behavior than untreated soils. This finding agreed with the previous conclusion [66,83,89]. However, this result was With the addition of FA from 0% to 30%, the effect of FA on the UCS stress was significantly great, especially for the FA ratio higher than 20% under the submergence condition.…”

Section: Effect Of Variation In Fly Ash-stabilized Loess On Stresssupporting

confidence: 92%

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Phoak

Luo

et al. 2018

Applied Sciences

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In this study, the influence of fly ash (FA) content (0%, 10%, 20%, and 30%) on the alteration in the physical and mechanical parameters of loess is investigated. The influences of curing time (0, 14, and 28 days) and submergence and non-submergence conditions are analyzed as well. Analysis considers the variation in Atterberg limits (liquid limit, plastic limit, and plasticity index), compaction parameters (optimum moisture content (OMC), and maximum dry density (MDD)), unconfined compressive strength (UCS) stress, UCS strain, California bearing ratio (CBR) value, and swell potential. Results show that the application of FA-stabilized loess (FASL) is effective. Specifically, the MDD decreases and the OMC increases, the UCS stress increases and the UCS strain decreases, the CBR value improves and the swell potential declines, but Atterberg limits are insignificantly changed by the increase in the FA ratio compared with those of untreated loess. The UCS stress and CBR value are improved with the increase in curing time, whereas the UCS strain is negligible. FASL under submergence condition plays an important role in improving the effect of FA on the UCS stress and CBR value compared with that under non-submergence condition. The UCS stress and CBR value are more increased and more decreased than the UCS strain in submerged samples. Therefore, the application of FASL in flood areas is important for obtaining sustainable construction materials and ensuring environmental protection.

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Section: Effect Of Variation In Fly Ash-stabilized Loess On Stresssupporting

confidence: 92%

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Phoak

Luo

et al. 2018

Applied Sciences

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“…No minerals from DMRR or GGBS were observed as a result of the low degree of crystallinity of these materials, the low dosage considered and the overlapping of their peak with those of the soil minerals [8,39]. The only hydration product was observed as a peak at 2 theta (35 • ) that was attributed to the formation of MSH gels based on Reference [38].…”

Section: X-ray Diffractionmentioning

confidence: 94%

“…In all the cases, the crystalline phases of the samples showed the soil mineralogy, which was composed mainly of calcite, quartz, halloysite and albite. The more intense peaks corresponded to calcite and quartz [38]. P2-12 (30/70) samples showed these main peaks, but their intensity decreased slightly due to the presence of the additives that reduced the soil's content in the samples.…”

Section: X-ray Diffractionmentioning

confidence: 98%

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

et al. 2021

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Nowadays, huge amounts of refractory materials are generated around the world. The majority of them lack valorization methods. This study analyzes the ability of a doloma and two magnesia spent refractory wastes as soil stabilizers on their own, as well as when combined with Ground-Granulated Blast Furnace Slags (GGBS). These materials showed a limited ability for the soil’s plasticity modification from a plasticity index of 15.6 to a minimum of 12.7. The high pH of the additives increased the soil’s pH from 7.88 to values in the range of 10.94–11.25 before the 28 days, allowing the development of the pozzolanic reactions. Unconfined compressive strength (UCS) increased along the curing time, reaching a maximum value of 5.68 MPa after 90 days. Based on the UCS, the optimum refractory GGBS ratios oscillate between 30:70 and 50:50. The UCS values after soaking samples reduced the unsoaked results between 68.70% to 94.41%. The binders considered showed a low effect against the soil swelling and the lack of delayed expansive effects because of the MgO hydration. Finally, X Ray Diffraction (XRD) tests showed that the stabilization only slightly modified the combinations of mineralogy and the formation of Magnesium Silicate Hydrate (MSH) gels.

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“…On the other hand, due to the deterioration of the natural environment and the increase of the CO2 concentration in the atmosphere, carbonization damage has become one of the most significant factors affecting the durability of fly ash concrete. However, the effect of load on the carbonization resistance of fly ash concrete was rarely discussed [4][5][6][7][8][9][10]. In practical engineering, the structure of a building is subject to the combined action of both load and environment, especially the former, so studying the environment alone cannot fully solve the carbonization problem in practical engineering [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Carbonization Resistance of Reinforced Concrete under Bending Load

Liu

Ren

et al. 2019

Frattura Ed Integrità Strutturale

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Fly ash has been used more and more often to take the place of cement as the admixture of concrete in the construction of concrete buildings. However, with the increase of the carbon dioxide (CO 2) concentration in the atmosphere, carbonization damage has become an essential factor affecting the durability of fly ash concrete. Here a long-term bending load device was developed to explore how the pouring surface and the bending load affect the carbonization resistance of reinforced concrete under rapid carbonization. In addition, the relationship between the bendingtension and bending-compression loads with respect to the carbonization damage of test blocks was also investigated. Due to the differences in the concrete compactness, the carbonization depth of the pouring surface was

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Study on flexural properties of active magnesia carbonation concrete with fly ash content

Cited by 13 publications

References 9 publications

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Influence of Submergence on Stabilization of Loess in Shaanxi Province by Adding Fly Ash

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Carbonization Resistance of Reinforced Concrete under Bending Load

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