Effect of sugar cane straw ash (SCSA) as solid precursor and the alkaline activator composition on alkali-activated binders based on blast furnace slag (BFS)

Moraes, J.C.B.; Tashima, Mauro M.; Akasaki, Jorge Luís; Melges, José Luiz Pinheiro; Monzó, J.; Borrachero, M.V.; Soriano, Lourdes; Payá, J.

doi:10.1016/j.conbuildmat.2017.03.166

Cited by 40 publications

(12 citation statements)

References 28 publications

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“…Alkaline activated material (AAM), as a kind of binder, is one of latest directions in constructing building materials and structures. From sugar cane straw ash (SCSA) as a solid precursor and alkali-activated binder bases on blast furnace slag (BES), studies have revealed SCSA as an efficient alkaline activated material (AAM) that also served as a silicon source in AAM [58].…”

Section: Agro-wastes Ash As An Active Pozzolans For Cementmentioning

confidence: 99%

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Kawasaki

Achal

2020

Sustainability

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Concrete, as the world’s most implemented construction material, is increasingly being used because of the rapid development of industrialization and urbanization. Limited resources and progressive depravation of the environment are forcing scientific efforts to seek alternative and effective materials from large amounts of natural resources as additives in the partial replacement of cement. Cement is a main constituent of concrete. To solve and minimize environmental issues, research works attempting to employ the wide availability of agricultural wastes, such as sugar cane bagasse, rice husk, sugar cane straw, and palm oil fuel, among others, into cement, and to finally bring sustainable and environmentally friendly properties to concrete are being examined. Agro-waste materials are crushed into fine and coarse aggregates or are burnt into ash, and are then mixed with cement, which is known as agro-cement. The replacement of aggregates, either partially or fully, is also deemed as a sustainable material in construction. This paper mainly reviews the current research on agro-cement that has been researched and applied for the enhancement of the strength and durability of concrete. It further summarizes the relevant knowledge and techniques, while providing optimal parameters for applying agricultural wastes in concrete.

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Section: Agro-wastes Ash As An Active Pozzolans For Cementmentioning

confidence: 99%

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Kawasaki

Achal

2020

Sustainability

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“…When biomass is used as raw materials to prepare nitrogen-doped porous carbon materials, the choice of activator is very important [ 23 , 25 , 26 ]. The material prepared from the cottonseed hull with potassium hydroxide as the activator has continuous, interconnected porous structure, while with the same method for cattail, when strong alkali KOH was used as activator for impregnation, strong alkali etching destroyed the structure of the cattail.…”

Section: Resultsmentioning

confidence: 99%

Micro-Structure Determines the Intrinsic Property Difference of Bio-Based Nitrogen-Doped Porous Carbon—A Case Study

et al. 2020

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Biomass-derived porous carbon materials have drawn considerable attention due to their natural abundance and low cost. In this work, nitrogen-doped porous carbons with high nitrogen content and large surface areas were designed and prepared from cottonseed hull and cattail. The two plant-based biomass compositions are similar, but the structures are very different, generating distinctly different property and performance of the prepared carbon materials. NRPC-112 has good electrochemical properties, while CN800 has good adsorption properties. By comparing the microstructure differences between the two starting materials, it was found that the structure of the raw materials would significantly affect the properties and performance of the materials. The work provided an important theoretical basis and reference for the selection of bio-resources for preparing carbon material. It is also important for choosing the appropriate synthesis method, process optimization, and application scenarios.

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“…In this study, no presence of Ca (OH) 2 is noted at 450–500 °C, showing consistency with the XRD findings [18,40]. Figure 8 presents the TG-DTG analysis results of C2-29-0, C2-29-50, S2-29-0 and S2-29-50 on 3 d, 28 d and 90 d. In the DTG spectrum, the primary endothermic peak is located between 100–180 °C, which represents the dehydration of C-A-S-H or C-S-H gel [43]. Another weak peak appearing near 650 °C corresponds to the CaCO 3 decomposition as detected by FI-RT.…”

Section: Resultsmentioning

confidence: 99%

“…At temperatures above 700 °C, the weight remains essentially unchanged. Due to the poor crystallization of fine particles formed by carbonization [43] and the presence of Na+, the decomposition temperature of CaCO 3 is lower than its natural range (700–800 °C).…”

Section: Resultsmentioning

confidence: 99%

Property Comparison of Alkali-Activated Carbon Steel Slag (CSS) and Stainless Steel Slag (SSS) and Role of Blast Furnace Slag (BFS) Chemical Composition

et al. 2019

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In order to compare the properties of alkali-activated carbon steel slag (CSS) and stainless steel slag (SSS), the effects of sodium hydroxide/sodium silicate solution mass ratio (NH/NS), liquid/solid ratio and blast furnace slag (BFS) dosage on the compressive strength, hydration products and hydration degree of CSS and SSS were studied. Furthermore, a combination of X-ray diffraction (XRD), thermo-gravimetric analysis coupled with differential thermal analysis (TGA-DTA), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS) were used to characterize the morphology and structure of alkali-activated CSS-BFS and SSS-BFS cementitious materials. As the results revealed, the primary hydrate of alkali-activated CSS and SSS is C-(A)-S-H with Q2 [SiO4] units, which has a low Ca/Si ratio and includes inert phases like a CaO-FeO-MnO-MgO solid solution (RO) in CSS while cuspidine, magnesiochromite etc. in SSS. More active C3S and β-C2S promote the alkali activation of CSS, whereas the less active γ-C2S hinders the depolymerization of SSS. The incorporation of BFS does not change the hydrate, whose seed effect is helpful for accelerating the depolymerization and polycondensation of CSS and SSS, especially for SSS, and makes the hydrate increase significantly. Owing to the high SiO2 and Al2O3 contents of SSS, the C-(A)-S-H chain length is increased, thus facilitating the polycondensation effect. In this study, the optimal NH/NS of CSS and SSS is NH/NS= 1:2, and the optimal liquid/solid ratio is 0.29. Compared to CSS–BFS, the C-(A)-S-H gel produced by SSS–BFS has lower Ca/Si and Al/Si ratios. Unlike CSS, pure SSS is inappropriate as an alkali-activated precursor and needs to be co-activated with BFS.

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Effect of sugar cane straw ash (SCSA) as solid precursor and the alkaline activator composition on alkali-activated binders based on blast furnace slag (BFS)

Cited by 40 publications

References 28 publications

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review

Micro-Structure Determines the Intrinsic Property Difference of Bio-Based Nitrogen-Doped Porous Carbon—A Case Study

Property Comparison of Alkali-Activated Carbon Steel Slag (CSS) and Stainless Steel Slag (SSS) and Role of Blast Furnace Slag (BFS) Chemical Composition

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