Microstructure and macro properties of sustainable alkali-activated fly ash mortar with various construction waste fines as binder replacement up to 100%

Liu, Miao; Wu, Huixia; Yao, Pengpeng; Ma, Zhiming

doi:10.1016/j.cemconcomp.2022.104733

Cited by 48 publications

(20 citation statements)

References 60 publications

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“…The evolving pattern of carbonation appeared similar in SL100 and SL75, but the carbonation speed of SL75 was faster. Compared with SL100, the carbonation resistance of SL75 was weaker, and that complied with the former literature [ 37 , 38 ]. Two reasons are given here to explain the reduced carbonation resistance after the blending of fly ash.…”

Section: Resultssupporting

confidence: 88%

“…Primarily, the alkali-activated products gradually shifted from C-(A)-S-H to N-A-S-H after the incorporation of fly ash because the calcium content in type F fly ash was lower (see Table 1 ). The amount of calcium-bearing materials was reduced by the blending, and the carbonation resistance of SL75 was thus lower [ 38 ]. In addition, compared with the C-S-H formed during cement hydration, the calcium to silica (aluminum) ratio in C-(A)-S-H (formed by pozzolanic reaction) was lower, thus the microstructure after carbonation was coarser [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

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Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

Cui

Shen²,

Shen³

et al. 2023

Materials

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Most reinforced concrete structures serve under windy environments, and the carbonation resistance under that circumstance exhibits significant difference from that under the steady (no wind) environment. In this study, a windy environment was simulated using one self-developed wind tunnel, and alkali-activated slag/fly ash paste specimens were adopted for the carbonation under variant windy environments. Meanwhile, to reveal the effect of inner humidity on the carbonation, sliced alkali-activated materials (AAM) were mass-balanced first to variant humidity, and were then carbonated under a 2.5 m/s windy environment. With the assistance of computed tomography (CT), the structure of AAM at variant carbonation ages was rendered. The experimental result showed that wind is capable of promoting the exchange of moisture between the sample inside and the outer atmosphere, leading to faster carbonation as compared to that under no wind environment. When preconditioned to lower inner humidity, the carbonation rate of AAM was faster because the larger gaseous space benefited the intrusion of both CO2 and moisture. Furthermore, when preconditioned to lower humidity, the cracking extent of AAM was severer, which also contributed to the faster carbonation. Moreover, compared with ordinary Portland cement (OPC), the carbonation front on each instant 1D gray-scale value profile was broader, which suggested that the carbonation progress of AAM under windy environments was no longer controlled solely by diffusion. In addition, the gray-scale value on instant 1D profile fluctuated drastically, which verified cracking in AAM carbonated under windy environments. The current work not only deepens the understanding of the carbonation mechanism in-site (mostly under windy environments), but also helps to develop more environment-friendly construction material, with better durability performance.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

Cui

Shen²,

Shen³

et al. 2023

Materials

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“…Current studies largely focus on the synthesis and characterization to determine the new type of precursor-green products. Researchers utilize various types of waste products from agriculture and construction on top of traditional industrial by-products, fly ash, slag and metakaolin [ 21 , 22 , 23 , 24 ]. However, the engineering application for the one-part AAMs in other cementitious-based materials has still lagged.…”

Section: Introductionmentioning

confidence: 99%

The effect of water-to-binder ratio (W/B) on pore structure of one-part alkali activated mortar

Yusslee

Beskhyroun

2023

Heliyon

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“…In recent decades, improving sustainability and durability of cement‐based materials have gained great attention worldwide 1–4 . Permeability of cement‐based materials is an important issue, which has a huge impact on the durability of structures made by these materials 5–7 .…”

Section: Introductionmentioning

confidence: 99%

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Chari¹,

Naseroleslami

Ahmadi³

2023

Structural Concrete

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Calcium stearate (CS) is effective to reduce permeability of different building materials under nonhydrostatic pressure but more actions need to be taken to shed light on its main and side effects on properties of cement‐based materials. This research project investigates the effect of CS on properties of these materials. Compressive strength analysis shows that the addition of CS at the dosage of 1% of cement weight reduces this parameter by approximately 20% but reducing water‐to‐binder ratio, and replacing 7.5% of cement weight with silica fume (SF) compensate for the strength loss caused by CS. Results of drying shrinkage test show that the addition of CS slightly increases drying shrinkage but replacing 7.5% of cement weight with SF can compensate for the negative effects of CS on drying shrinkage. Permeability analysis shows that CS is not as effective as SF and natural zeolite (NZ) to improve impermeability under hydrostatic pressure but it is more effective than SF and NZ to improve impermeability under nonhydrostatic pressure because the addition of CS at the dosage of 1% of cement weight reduces capillary water absorption by roughly 60%. Therefore, the simultaneous use of CS and these supplementary cementitious materials improves not only impermeability under hydrostatic pressure but also impermeability under nonhydrostatic pressure.

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Microstructure and macro properties of sustainable alkali-activated fly ash mortar with various construction waste fines as binder replacement up to 100%

Cited by 48 publications

References 60 publications

Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

Investigation on the Carbonation Behavior of Alkali-Activated Pastes Served under Windy Environments

The effect of water-to-binder ratio (W/B) on pore structure of one-part alkali activated mortar

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

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